libdap  Updated for version 3.17.0
libdap::Sequence Class Reference

Holds a sequence. More...

#include <Sequence.h>

Inheritance diagram for libdap::Sequence:

List of all members.

Public Types

typedef stack< BaseType * > btp_stack
typedef std::vector< BaseType * >
::const_iterator 
Vars_citer
typedef std::vector< BaseType * >
::iterator 
Vars_iter
typedef std::vector< BaseType * >
::reverse_iterator 
Vars_riter

Public Member Functions

virtual void add_var (BaseType *bt, Part part=nil)
virtual void add_var_nocopy (BaseType *bt, Part part=nil)
virtual unsigned int buf2val (void **)
 Reads the class data.
virtual bool check_semantics (string &msg, bool all=false)
 Compare an object's current state with the semantics of its type.
virtual void clear_local_data ()
virtual void compute_checksum (Crc32 &checksum)
 include the data for this variable in the checksum DAP4 includes a checksum with every data response. This method adds the variable's data to that checksum.
virtual string dataset () const
 Returns the name of the dataset used to create this instance.
virtual void del_var (const string &name)
virtual void del_var (Vars_iter i)
virtual void deserialize (D4StreamUnMarshaller &um, DMR &dmr)
virtual bool deserialize (UnMarshaller &um, DDS *dds, bool reuse=false)
 Deserialize (read from the network) the entire Sequence.
virtual void dump (ostream &strm) const
 dumps information about this object
virtual int element_count (bool leaves=false)
 Count the members of constructor types.
virtual std::string FQN () const
virtual AttrTableget_attr_table ()
virtual int get_ending_row_number ()
 Get the ending row number.
virtual BaseTypeget_parent () const
virtual int get_row_stride ()
 Get the row stride.
int get_starting_row_number ()
 Get the starting row number.
bool get_unsent_data ()
 Get the unsent data property.
BaseTypeget_var_index (int i)
Vars_iter get_vars_iter (int i)
virtual void intern_data ()
 Read data into this variable.
virtual void intern_data (ConstraintEvaluator &eval, DDS &dds)
virtual bool is_constructor_type () const
 Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable.
virtual bool is_dap2_only_type ()
virtual bool is_dap4 () const
virtual bool is_in_selection ()
 Is this variable part of the current selection?
virtual bool is_leaf_sequence ()
virtual bool is_linear ()
 Check to see whether this variable can be printed simply.
virtual bool is_simple_type () const
 Returns true if the instance is a numeric, string or URL type variable.
virtual bool is_vector_type () const
 Returns true if the instance is a vector (i.e., array) type variable.
virtual int length () const
virtual string name () const
 Returns the name of the class instance.
virtual int number_of_rows () const
Sequenceoperator= (const Sequence &rhs)
virtual bool ops (BaseType *b, int op)
 Evaluate relational operators.
void print_dap4 (XMLWriter &xml, bool constrained=false)
virtual void print_decl (ostream &out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)
 Print an ASCII representation of the variable structure.
virtual void print_decl (FILE *out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false)
 Print an ASCII representation of the variable structure.
virtual void print_one_row (ostream &out, int row, string space, bool print_row_num=false)
virtual void print_one_row (FILE *out, int row, string space, bool print_row_num=false)
virtual void print_val (ostream &out, string space="", bool print_decl_p=true)
 Prints the value of the variable.
virtual void print_val (FILE *out, string space="", bool print_decl_p=true)
 Prints the value of the variable.
virtual void print_val_by_rows (ostream &out, string space="", bool print_decl_p=true, bool print_row_numbers=true)
virtual void print_val_by_rows (FILE *out, string space="", bool print_decl_p=true, bool print_row_numbers=true)
virtual void print_xml (ostream &out, string space=" ", bool constrained=false)
virtual void print_xml (FILE *out, string space=" ", bool constrained=false)
virtual void print_xml_writer (XMLWriter &xml, bool constrained=false)
virtual BaseTypeptr_duplicate ()
virtual bool read ()
 simple implementation of read that iterates through vars and calls read on them
virtual bool read_p ()
 Has this variable been read?
virtual bool read_row (int row, DDS &dds, ConstraintEvaluator &eval, bool ce_eval=true)
void reset_row_number ()
 Rest the row number counter.
virtual BaseTypeRowrow_value (size_t row)
 Get a whole row from the sequence.
virtual bool send_p ()
 Should this variable be sent?
 Sequence (const string &n)
 The Sequence constructor.
 Sequence (const string &n, const string &d)
 The Sequence server-side constructor.
 Sequence (const Sequence &rhs)
 The Sequence copy constructor.
virtual void serialize (D4StreamMarshaller &m, DMR &dmr, bool filter=false)
 Serialize a Constructor.
virtual bool serialize (ConstraintEvaluator &eval, DDS &dds, Marshaller &m, bool ce_eval=true)
virtual void set_attr_table (const AttrTable &at)
virtual void set_in_selection (bool state)
 Set the in_selection property.
virtual void set_is_dap4 (const bool v)
virtual void set_leaf_p (bool state)
virtual void set_leaf_sequence (int lvl=1)
 Mark the Sequence which holds the leaf elements.
virtual void set_length (int)
 Set the number of elements for this variable.
virtual void set_name (const string &n)
 Sets the name of the class instance.
virtual void set_parent (BaseType *parent)
virtual void set_read_p (bool state)
 Sets the value of the read_p property.
virtual void set_row_number_constraint (int start, int stop, int stride=1)
virtual void set_send_p (bool state)
virtual void set_synthesized_p (bool state)
virtual void set_type (const Type &t)
 Sets the type of the class instance.
void set_unsent_data (bool usd)
 Set the unsent data property.
virtual void set_value (SequenceValues &values)
virtual bool synthesized_p ()
virtual string toString ()
virtual void transfer_attributes (AttrTable *at)
virtual BaseTypetransform_to_dap4 (D4Group *root, Constructor *container)
virtual Type type () const
 Returns the type of the class instance.
virtual string type_name () const
 Returns the type of the class instance as a string.
virtual unsigned int val2buf (void *, bool)
 Loads class data.
virtual SequenceValues value ()
virtual SequenceValuesvalue_ref ()
virtual BaseTypevar (const string &name, bool exact_match=true, btp_stack *s=0)
 btp_stack no longer needed; use back pointers (BaseType::get_parent())
virtual BaseTypevar (const string &n, btp_stack &s)
Vars_iter var_begin ()
Vars_iter var_end ()
Vars_riter var_rbegin ()
Vars_riter var_rend ()
virtual BaseTypevar_value (size_t row, const string &name)
 Get the BaseType pointer to the named variable of a given row.
virtual BaseTypevar_value (size_t row, size_t i)
 Get the BaseType pointer to the $i^{th}$ variable of row.
virtual unsigned int width (bool constrained=false) const
virtual D4Attributesattributes ()
virtual void set_attributes (D4Attributes *)
virtual void set_attributes_nocopy (D4Attributes *)

Protected Types

typedef stack< SequenceValues * > sequence_values_stack_t

Protected Member Functions

virtual void intern_data_for_leaf (DDS &dds, ConstraintEvaluator &eval, sequence_values_stack_t &sequence_values_stack)
virtual void intern_data_parent_part_one (DDS &dds, ConstraintEvaluator &eval, sequence_values_stack_t &sequence_values_stack)
virtual void intern_data_parent_part_two (DDS &dds, ConstraintEvaluator &eval, sequence_values_stack_t &sequence_values_stack)
virtual void intern_data_private (ConstraintEvaluator &eval, DDS &dds, sequence_values_stack_t &sequence_values_stack)
void m_duplicate (const Constructor &s)
void m_duplicate (const BaseType &bt)
 Perform a deep copy.
void m_duplicate (const Sequence &s)
BaseTypem_exact_match (const string &name, btp_stack *s=0)
BaseTypem_leaf_match (const string &name, btp_stack *s=0)
virtual bool serialize_leaf (DDS &dds, ConstraintEvaluator &eval, Marshaller &m, bool ce_eval)
virtual bool serialize_parent_part_one (DDS &dds, ConstraintEvaluator &eval, Marshaller &m)
virtual void serialize_parent_part_two (DDS &dds, ConstraintEvaluator &eval, Marshaller &m)

Protected Attributes

bool d_in_selection
bool d_is_synthesized
std::vector< BaseType * > d_vars

Friends

class SequenceTest

Detailed Description

Holds a sequence.

This is the interface for the class Sequence. A sequence contains a single set of variables, all at the same lexical level just like a Structure. Like a Structure, a Sequence may contain other compound types, including other Sequences. Unlike a Structure, a Sequence defines a pattern that is repeated N times for a sequence of N elements. It is useful to think of a Sequence as representing a table of values (like a relational database), with each row of the table corresponding to a Sequence ``instance.'' (This usage can be confusing, since ``instance'' also refers to a particular item of class Sequence.) For example:

 Sequence {
 String name;
 Int32 age;
 } person;
 

This represents a Sequence of ``person'' records, each instance of which contains a name and an age:

 Fred       34
 Ralph      23
 Andrea     29
 ...
 

A Sequence can be arbitrarily long, which is to say that its length is not part of its declaration. A Sequence can contain other Sequences:

 Sequence {
 String name;
 Int32 age;
 Sequence {
 String friend;
 } friend_list;
 } person;
 

This is still represented as a single table, but each row contains the elements of both the main Sequence and the nested one:

 Fred       34     Norman
 Fred       34     Andrea
 Fred       34     Ralph
 Fred       34     Lisa
 Ralph      23     Norman
 Ralph      23     Andrea
 Ralph      23     Lisa
 Ralph      23     Marth
 Ralph      23     Throckmorton
 Ralph      23     Helga
 Ralph      23     Millicent
 Andrea     29     Ralph
 Andrea     29     Natasha
 Andrea     29     Norman
 ...        ..     ...
 

Internally, the Sequence is represented by a vector of vectors. The members of the outer vector are the members of the Sequence. This includes the nested Sequences, as in the above example.

NB: Note that in the past this class had a different behavior. It held only one row at a time and the deserialize(...) method had to be called from within a loop. This is no longer true. Now the deserailize(...) method should be called once and will read the entire sequence's values from the server. All the values are now stored in an instance of Sequence, not just a single row's.

Because the length of a Sequence is indeterminate, there are changes to the behavior of the functions to read this class of data. The read() function for Sequence must be written so that successive calls return values for successive rows of the Sequence.

Similar to a C structure, you refer to members of Sequence elements with a ``.'' notation. For example, if the Sequence has a member Sequence called ``Tom'' and Tom has a member Float32 called ``shoe_size'', you can refer to Tom's shoe size as ``Tom.shoe_size''.

Note:
This class contains the 'logic' for both the server- and client-side behavior. The field d_values is used by the client-side methods to store the entire Sequence. On the server-side, the read() method uses an underlying data system to read one row of data values which are then serialized using the serialize() methods of each variable.
Todo:
Add an isEmpty() method which returns true if the Sequence is empty. This should work before and after calling deserialize().

Definition at line 162 of file Sequence.h.


Constructor & Destructor Documentation

libdap::Sequence::Sequence ( const string &  n)

The Sequence constructor.

The Sequence constructor requires only the name of the variable to be created. The name may be omitted, which will create a nameless variable. This may be adequate for some applications.

Parameters:
nA string containing the name of the variable to be created.

Definition at line 160 of file Sequence.cc.

libdap::Sequence::Sequence ( const string &  n,
const string &  d 
)

The Sequence server-side constructor.

The Sequence server-side constructor requires the name of the variable to be created and the dataset name from which this variable is being created.

Parameters:
nA string containing the name of the variable to be created.
dA string containing the name of the dataset from which this variable is being created.

Definition at line 176 of file Sequence.cc.

The Sequence copy constructor.

Definition at line 184 of file Sequence.cc.


Member Function Documentation

void libdap::Constructor::add_var ( BaseType bt,
Part  part = nil 
) [virtual, inherited]

Adds an element to a Constructor.

Parameters:
btA pointer to the variable to add to this Constructor.
partNot used by this class, defaults to nil

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 382 of file Constructor.cc.

void libdap::Constructor::add_var_nocopy ( BaseType bt,
Part  part = nil 
) [virtual, inherited]

Adds an element to a Constructor.

Parameters:
btA pointer to thee variable to add to this Constructor.
partNot used by this class, defaults to nil

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 407 of file Constructor.cc.

D4Attributes * libdap::BaseType::attributes ( ) [virtual, inherited]

DAP4 Attribute methods

Definition at line 539 of file BaseType.cc.

virtual unsigned int libdap::Constructor::buf2val ( void **  val) [inline, virtual, inherited]

Reads the class data.

Reads the class data into the memory referenced by val. The caller should either allocate enough storage to val to hold the class data or set *val to null. If *val is NULL, memory will be allocated by this function with new(). If the memory is allocated this way, the caller is responsible for deallocating that memory. Array and values for simple types are stored as C would store an array.

Deprecated:
Use value() in the leaf classes.
Parameters:
valA pointer to a pointer to the memory into which the class data will be copied. If the value pointed to is NULL, memory will be allocated to hold the data, and the pointer value modified accordingly. The calling program is responsible for deallocating the memory references by this pointer.
Returns:
The size (in bytes) of the information copied to val.

Implements libdap::BaseType.

Definition at line 118 of file Constructor.h.

bool libdap::Constructor::check_semantics ( string &  msg,
bool  all = false 
) [virtual, inherited]

Compare an object's current state with the semantics of its type.

This function checks the class instance for internal consistency. This is important to check for complex constructor classes. For BaseType, an object is semantically correct if it has both a non-null name and type.

For example, an Int32 instance would return FALSE if it had no name or no type defined. A Grid instance might return FALSE for more complex reasons, such as having Map arrays of the wrong size or shape.

This function is used by the DDS class, and will rarely, if ever, be explicitly called by a DODS application program. A variable must pass this test before it is sent, but there may be many other stages in a retrieve operation where it would fail.

Returns:
Returns FALSE when the current state violates some aspect of the type semantics, TRUE otherwise.
Parameters:
msgA returned string, containing a message indicating the source of any problem.
allFor complex constructor types (Grid, Sequence, Structure), this flag indicates whether to check the semantics of the member variables, too.
See also:
DDS::check_semantics

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 764 of file Constructor.cc.

Remove any read or set data in the private data of the variable, setting read_p() to false. Used to clear any dynamically allocated storage that holds (potentially large) data. For the simple types, this no-op version is all that's needed. Vector and some other classes define a special version and have serialize() implementations that call it to free data as soon as possible after sending it.

Note:
Added 7/5/15 jhrg
Any specialization of this should make sure to reset the read_p property.

Reimplemented from libdap::BaseType.

Definition at line 242 of file Sequence.cc.

void libdap::Constructor::compute_checksum ( Crc32 checksum) [virtual, inherited]

include the data for this variable in the checksum DAP4 includes a checksum with every data response. This method adds the variable's data to that checksum.

Parameters:
checksumA Crc32 instance that holds the current checksum.

Implements libdap::BaseType.

Definition at line 525 of file Constructor.cc.

string libdap::BaseType::dataset ( ) const [virtual, inherited]

Returns the name of the dataset used to create this instance.

A dataset from which the data is to be read. The meaning of this string will vary among different types of data sources. It may be the name of a data file or an identifier used to read data from a relational database.

Definition at line 298 of file BaseType.cc.

void libdap::Constructor::del_var ( const string &  n) [virtual, inherited]

Remove an element from a Constructor.

Parameters:
nname of the variable to remove

Definition at line 423 of file Constructor.cc.

void libdap::Constructor::deserialize ( D4StreamUnMarshaller um,
DMR dmr 
) [virtual, inherited]

The DAP4 deserialization method.

Parameters:
um
dmr
Exceptions:
Erroror InternalErr

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Sequence, and libdap::D4Group.

Definition at line 584 of file Constructor.cc.

bool libdap::Sequence::deserialize ( UnMarshaller um,
DDS dds,
bool  reuse = false 
) [virtual]

Deserialize (read from the network) the entire Sequence.

This method used to read a single row at a time. Now the entire sequence is read at once. The method used to return True to indicate that more data needed to be deserialized and False when the sequence was completely read. Now it simply returns false. This might seem odd, but making this method return false breaks existing software the least.

Parameters:
umAn UnMarshaller that knows how to deserialize data
ddsA DataDDS from which to read.
reusePassed to child objects when they are deserialized. Some implementations of deserialize() use this to determine if new storage should be allocated or existing storage reused.
Exceptions:
Errorif a sequence stream marker cannot be read.
InternalErrif the dds param is not a DataDDS.
Returns:
A return value of false indicates that an EOS ("end of Sequence") marker was found, while a value of true indicates that there are more rows to be read. This version always reads the entire sequence, so it always returns false.

Reimplemented from libdap::Constructor.

Definition at line 1074 of file Sequence.cc.

void libdap::Sequence::dump ( ostream &  strm) const [virtual]

dumps information about this object

Displays the pointer value of this instance and information about this instance.

Parameters:
strmC++ i/o stream to dump the information to
Returns:
void

Reimplemented from libdap::Constructor.

Definition at line 1347 of file Sequence.cc.

int libdap::Constructor::element_count ( bool  leaves = false) [virtual, inherited]

Count the members of constructor types.

Return a count of the total number of variables in this variable. This is used to count the number of variables held by a constructor variable - for simple type and vector variables it always returns 1.

For compound data types, there are two ways to count members. You can count the members, or you can count the simple members and add that to the count of the compound members. For example, if a Structure contains an Int32 and another Structure that itself contains two Int32 members, the element count of the top-level structure could be two (one Int32 and one Structure) or three (one Int32 by itself and two Int32's in the subsidiary Structure). Use the leaves parameter to control which kind of counting you desire.

Returns:
Returns 1 for simple types. For compound members, the count depends on the leaves argument.
Parameters:
leavesThis parameter is only relevant if the object contains other compound data types. If FALSE, the function counts only the data variables mentioned in the object's declaration. If TRUE, it counts the simple members, and adds that to the sum of the counts for the compound members. This parameter has no effect for simple type variables.

Reimplemented from libdap::BaseType.

Definition at line 169 of file Constructor.cc.

string libdap::Constructor::FQN ( ) const [virtual, inherited]

Return the FQN for this variable. This will include the D4 Group component of the name.

Returns:
The FQN in a string

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 156 of file Constructor.cc.

AttrTable & libdap::BaseType::get_attr_table ( ) [virtual, inherited]

Get this variable's AttrTable. It's generally a bad idea to return a reference to a contained object, but in this case it seems that building an interface inside BaseType is overkill.

Use the AttrTable methods to manipulate the table.

Definition at line 522 of file BaseType.cc.

Get the ending row number.

Return the ending row number if the sequence was constrained using row numbers (instead of, or in addition to, a relational constraint). If a relational constraint was also given, the row number corresponds to the row number of the sequence after applying the relational constraint.

If the bracket notation was not used to constrain this sequence, this method returns -1.

Returns:
The ending row number.

Definition at line 1162 of file Sequence.cc.

BaseType * libdap::BaseType::get_parent ( ) const [virtual, inherited]

Return a pointer to the Constructor or Vector which holds (contains) this variable. If this variable is at the top level, this method returns null.

Returns:
A BaseType pointer to the variable's parent.

Definition at line 667 of file BaseType.cc.

Get the row stride.

Return the row stride number if the sequence was constrained using row numbers (instead of, or in addition to, a relational constraint). If a relational constraint was also given, the row stride is applied to the sequence after applying the relational constraint.

If the bracket notation was not used to constrain this sequence, this method returns -1.

Returns:
The row stride.

Definition at line 1146 of file Sequence.cc.

Get the starting row number.

Return the starting row number if the sequence was constrained using row numbers (instead of, or in addition to, a relational constraint). If a relational constraint was also given, the row number corresponds to the row number of the sequence after applying the relational constraint.

If the bracket notation was not used to constrain this sequence, this method returns -1.

Returns:
The starting row number.

Definition at line 1131 of file Sequence.cc.

Get the unsent data property.

Definition at line 273 of file Sequence.h.

BaseType * libdap::Constructor::get_var_index ( int  i) [inherited]

Return the BaseType pointer for the ith variable.

Parameters:
iThis index
Returns:
The corresponding BaseType*.

Definition at line 372 of file Constructor.cc.

Constructor::Vars_iter libdap::Constructor::get_vars_iter ( int  i) [inherited]

Return the iterator for the ith variable.

Parameters:
ithe index
Returns:
The corresponding Vars_iter

Definition at line 363 of file Constructor.cc.

void libdap::Constructor::intern_data ( ) [virtual, inherited]

Read data into this variable.

Parameters:
evalEvaluator for a constraint expression
dmrDMR for the whole dataset

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Sequence, and libdap::D4Group.

Definition at line 531 of file Constructor.cc.

void libdap::Sequence::intern_data ( ConstraintEvaluator eval,
DDS dds 
) [virtual]

This method is used to evaluate a constraint and based on those results load the Sequence variable with data. This simulates having a server call the serialize() method and a client call the deserialize() method without the overhead of any IPC. Use this method on the server-side to 'load the d_values field with data' so that other code and work with those data.

The somewhat odd algorithm used by serialize() is largely copied here, so comments about logic in serialize() and the related methods apply here as well.

Note:
Even though each Sequence variable has a values field, only the top-most Sequence in a hierarchy of Sequences holds values. The field accessed by the var_value() method is completely linked object; access the values of nested Sequences using the BaseType objects returned by var_value().
Only call this method for top-most Sequences. Never call it for Sequences which have a parent (directly or indirectly) variable that is a Sequence.
Parameters:
evalUse this constraint evaluator
ddsThis DDS holds the variables for the data source

Reimplemented from libdap::Constructor.

Definition at line 872 of file Sequence.cc.

bool libdap::BaseType::is_constructor_type ( ) const [virtual, inherited]

Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable.

Returns:
True if the instance is a Structure, Sequence or Grid, False otherwise.

Definition at line 352 of file BaseType.cc.

The Sequence class will be streamlined for DAP4.

Definition at line 267 of file Sequence.cc.

bool libdap::BaseType::is_in_selection ( ) [virtual, inherited]

Is this variable part of the current selection?

Does this variable appear in either the selection part or as a function argument in the current constrain expression. If this property is set (true) then implementations of the read() method should read this variable.

Note:
This method does not check, nor does it know about the semantics of, string arguments passed to functions. Those functions might include variable names in strings; they are responsible for reading those variables. See the grid (func_grid_select()) for an example.
See also:
BaseType::read()

Definition at line 619 of file BaseType.cc.

bool libdap::Sequence::is_linear ( ) [virtual]

Check to see whether this variable can be printed simply.

True if the instance can be flattened and printed as a single table of values. For Arrays and Grids this is always false. For Structures and Sequences the conditions are more complex. The implementation provided by this class always returns false. Other classes should override this implementation.

Todo:
Change the name to is_flattenable or something like that. 05/16/03 jhrg
Returns:
True if the instance can be printed as a single table of values, false otherwise.

Reimplemented from libdap::Constructor.

Definition at line 287 of file Sequence.cc.

bool libdap::BaseType::is_simple_type ( ) const [virtual, inherited]

Returns true if the instance is a numeric, string or URL type variable.

Returns:
True if the instance is a scalar numeric, String or URL variable, False otherwise. Arrays (even of simple types) return False.
See also:
is_vector_type()

Definition at line 333 of file BaseType.cc.

bool libdap::BaseType::is_vector_type ( ) const [virtual, inherited]

Returns true if the instance is a vector (i.e., array) type variable.

Returns:
True if the instance is an Array, False otherwise.

Definition at line 342 of file BaseType.cc.

int libdap::Sequence::length ( ) const [virtual]

Returns the number of elements in a Sequence object. Note that this is not the number of items in a row, but the number of rows in the complete sequence object. To be meaningful, this must be computed after constraint expression (CE) evaluation. The purpose of this function is to facilitate translations between Sequence objects and Array objects, particularly when the Sequence is too large to be transferred from the server to the client in its entirety.

This function, to be useful, must be specialized for the API and data format in use.

Returns:
The base implementation returns -1, indicating that the length is not known. Sub-classes specific to a particular API will have a more complete implementation.

Reimplemented from libdap::BaseType.

Definition at line 408 of file Sequence.cc.

void libdap::BaseType::m_duplicate ( const BaseType bt) [protected, inherited]

Perform a deep copy.

Perform a deep copy. Copies the values of bt into *this. Pointers are dereferenced and their values are copied into a newly allocated instance.

Parameters:
btThe source object.

Definition at line 85 of file BaseType.cc.

string libdap::BaseType::name ( ) const [virtual, inherited]

Returns the name of the class instance.

Definition at line 260 of file BaseType.cc.

bool libdap::BaseType::ops ( BaseType b,
int  op 
) [virtual, inherited]

Evaluate relational operators.

This method contains the relational operators used by the constraint expression evaluator in the DDS class. Each class that wants to be able to evaluate relational expressions must overload this function. The implementation in BaseType throws an InternalErr exception. The DAP library classes Byte, ..., Url provide specializations of this method. It is not meaningful for classes such as Array because relational expressions using Array are not supported.

The op argument refers to a table generated by bison from the constraint expression parser. Use statements like the following to correctly interpret its value:

    switch (op) {
        case EQUAL: return i1 == i2;
        case NOT_EQUAL: return i1 != i2;
        case GREATER: return i1 > i2;
        case GREATER_EQL: return i1 >= i2;
        case LESS: return i1 < i2;
        case LESS_EQL: return i1 <= i2;
        case REGEXP: throw Error("Regular expressions are not supported for integer values");
        default: throw Error("Unknown operator");
    }
    

This function is used by the constraint expression evaluator.

Parameters:
bCompare the value of this instance with b.
opAn integer index indicating which relational operator is implied. Choose one from the following: EQUAL, NOT_EQUAL, GREATER, GREATER_EQL, LESS, LESS_EQL, and REGEXP.
Returns:
The boolean value of the comparison.

Reimplemented in libdap::D4Enum, libdap::Str, libdap::Int32, libdap::Float32, libdap::Byte, libdap::Float64, libdap::UInt32, libdap::D4Opaque, libdap::Int16, libdap::UInt16, libdap::Int64, libdap::UInt64, and libdap::Int8.

Definition at line 1170 of file BaseType.cc.

void libdap::Constructor::print_dap4 ( XMLWriter xml,
bool  constrained = false 
) [virtual, inherited]

Write the DAP4 XML representation for this variable. This method is used to build the DAP4 DMR response object.

Parameters:
xmlAn XMLWriter that will do the serialization
constrainedTrue if the response should show the variables subject to the current constraint expression.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 740 of file Constructor.cc.

void libdap::Constructor::print_decl ( ostream &  out,
string  space = "    ",
bool  print_semi = true,
bool  constraint_info = false,
bool  constrained = false 
) [virtual, inherited]

Print an ASCII representation of the variable structure.

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

    Float64 lat[lat = 180];
    

While a more complex declaration (for a Grid, in this case), would look like this:

    Grid {
    ARRAY:
    Int32 sst[time = 404][lat = 180][lon = 360];
    MAPS:
    Float64 time[time = 404];
    Float64 lat[lat = 180];
    Float64 lon[lon = 360];
    } sst;
    
Parameters:
outThe output stream on which to print the declaration.
spaceEach line of the declaration will begin with the characters in this string. Usually used for leading spaces.
print_semiA boolean value indicating whether to print a semicolon at the end of the declaration.
constraint_infoA boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, print_decl() prints the value of the variable's send_p() flag after the declaration.
constrainedIf this boolean value is TRUE, the variable's declaration is only printed if is the send_p() flag is TRUE. If a constraint expression is in place, and this variable is not requested, the send_p() flag is FALSE.
See also:
DDS
DDS::CE

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 601 of file Constructor.cc.

void libdap::Constructor::print_decl ( FILE *  out,
string  space = "    ",
bool  print_semi = true,
bool  constraint_info = false,
bool  constrained = false 
) [virtual, inherited]

Print an ASCII representation of the variable structure.

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

    Float64 lat[lat = 180];
    

While a more complex declaration (for a Grid, in this case), would look like this:

    Grid {
    ARRAY:
    Int32 sst[time = 404][lat = 180][lon = 360];
    MAPS:
    Float64 time[time = 404];
    Float64 lat[lat = 180];
    Float64 lon[lon = 360];
    } sst;
    
Parameters:
outThe output stream on which to print the declaration.
spaceEach line of the declaration will begin with the characters in this string. Usually used for leading spaces.
print_semiA boolean value indicating whether to print a semicolon at the end of the declaration.
constraint_infoA boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, print_decl() prints the value of the variable's send_p() flag after the declaration.
constrainedIf this boolean value is TRUE, the variable's declaration is only printed if is the send_p() flag is TRUE. If a constraint expression is in place, and this variable is not requested, the send_p() flag is FALSE.
See also:
DDS
DDS::CE

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 592 of file Constructor.cc.

void libdap::Sequence::print_val ( ostream &  out,
string  space = "",
bool  print_decl_p = true 
) [virtual]

Prints the value of the variable.

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters:
outThe output ostream on which to print the value.
spaceThis value is passed to the print_decl() function, and controls the leading spaces of the output.
print_decl_pA boolean value controlling whether the variable declaration is printed as well as the value.

Reimplemented from libdap::Constructor.

Definition at line 1266 of file Sequence.cc.

void libdap::Sequence::print_val ( FILE *  out,
string  space = "",
bool  print_decl_p = true 
) [virtual]

Prints the value of the variable.

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters:
outThe output stream on which to print the value.
spaceThis value is passed to the print_decl() function, and controls the leading spaces of the output.
print_decl_pA boolean value controlling whether the variable declaration is printed as well as the value.

Reimplemented from libdap::Constructor.

Definition at line 1261 of file Sequence.cc.

void libdap::Constructor::print_xml ( ostream &  out,
string  space = "    ",
bool  constrained = false 
) [virtual, inherited]
Deprecated:

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 667 of file Constructor.cc.

void libdap::Constructor::print_xml ( FILE *  out,
string  space = "    ",
bool  constrained = false 
) [virtual, inherited]
Deprecated:

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 656 of file Constructor.cc.

void libdap::Constructor::print_xml_writer ( XMLWriter xml,
bool  constrained = false 
) [virtual, inherited]

Write the XML representation of this variable. This method is used to build the DDX XML response.

Parameters:
outDestination output stream
spaceUse this to indent child declarations. Default is "".
constrainedIf true, only print this if it's part part of the current projection. Default is False.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 690 of file Constructor.cc.

Clone this instance. Allocate a new instance and copy *this into it. This method must perform a deep copy.

Note:
This method should not copy data values, but must copy all other fields in the object.
Returns:
A newly allocated copy of this.

Implements libdap::BaseType.

Definition at line 191 of file Sequence.cc.

bool libdap::Constructor::read ( ) [virtual, inherited]

simple implementation of read that iterates through vars and calls read on them

Returns:
returns false to signify all has been read

Reimplemented from libdap::BaseType.

Definition at line 451 of file Constructor.cc.

bool libdap::BaseType::read_p ( ) [virtual, inherited]

Has this variable been read?

Returns true if the value(s) for this variable have been read from the data source, otherwise returns false. This method is used to determine when values need to be read using the read() method. When read_p() returns true, this library assumes that buf2val() (and other methods such as get_vec()) can be used to access the value(s) of a variable.

Returns:
True if the variable's value(s) have been read, false otherwise.

Definition at line 420 of file BaseType.cc.

bool libdap::Sequence::read_row ( int  row,
DDS dds,
ConstraintEvaluator eval,
bool  ce_eval = true 
) [virtual]

Read row number row of the Sequence. The values of the row are obtained by calling the read() method of the sequence. The current row just read is stored in the Sequence instance along with its row number. If a selection expression has been supplied, rows are counted only if they satisfy that expression.

Note that we can only advance in a Sequence. It is not possible to back up and read a row numbered lower than the current row. If you need that you will need to replace the serialize() method with one of your own.

Used on the server side.

Note:
The first row is row number zero. A Sequence with 100 rows will have row numbers 0 to 99.
Todo:
This code ignores the main reason for nesting the sequences, that if the outer Sequence's current instance fails the CE, there's no need to look at the values of the inner Sequence. But in the code that calls this method (serialize() and intern_data()) the CE is not evaluated until the inner-most Sequence (i.e., the leaf Sequence) is read. That means that each instance of the inner Sequence is read and the CE evaluated for each of those reads. To fix this, and the overall problem of complexity here, we need to re-think Sequences and how they behave. 11/13/2007 jhrg
Returns:
A boolean value, with TRUE indicating that read_row should be called again because there's more data to be read. FALSE indicates the end of the Sequence.
Parameters:
rowThe row number to read.
ddsA reference to the DDS for this dataset.
evalUse this as the constraint expression evaluator.
ce_evalIf True, evaluate any CE, otherwise do not.

Definition at line 552 of file Sequence.cc.

Rest the row number counter.

When reading a nested sequence, use this method to reset the internal row number counter. This is necessary so that the second, ... instances of the inner/nested sequence will start off reading row zero.

Definition at line 422 of file Sequence.cc.

BaseTypeRow * libdap::Sequence::row_value ( size_t  row) [virtual]

Get a whole row from the sequence.

Parameters:
rowGet row number row from the sequence.
Returns:
A BaseTypeRow object (vector<BaseType *>). Null if there's no such row number as row.

Definition at line 320 of file Sequence.cc.

bool libdap::BaseType::send_p ( ) [virtual, inherited]

Should this variable be sent?

Returns the state of the send_p property. If true, this variable should be sent to the client, if false, it should not. If no constraint expression (CE) has been evaluated, this property is true for all variables in a data source (i.e., for all the variables listed in a DDS). If a CE has been evaluated, this property is true only for those variables listed in the projection part of the CE.

Returns:
True if the variable should be sent to the client, false otherwise.

Definition at line 494 of file BaseType.cc.

void libdap::Constructor::serialize ( D4StreamMarshaller m,
DMR dmr,
bool  filter = false 
) [virtual, inherited]

Serialize a Constructor.

Todo:
See notebook for 8/21/14
Parameters:
m
dmrUnused
evalUnused
filterUnused
Exceptions:
Erroris thrown if the value needs to be read and that operation fails.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Sequence, and libdap::D4Group.

Definition at line 553 of file Constructor.cc.

bool libdap::Sequence::serialize ( ConstraintEvaluator eval,
DDS dds,
Marshaller m,
bool  ce_eval = true 
) [virtual]

Serialize a Sequence.

Leaf Sequences must be marked as such (see DDS::tag_nested_sequence()), as must the top most Sequence.

How the code works. Methods called for various functions are named in brackets:

  1. Sending a one-level sequence:

     Dataset {
     Sequence {
     Int x;
     Int y;
     } flat;
     } case_1;
     

    Serialize it by reading successive rows and sending all of those that satisfy the CE. Before each row, send a start of instance (SOI) marker. Once all rows have been sent, send an End of Sequence (EOS) marker.[serialize_leaf].

  2. Sending a nested sequence:

     Dataset {
     Sequence {
     Int t;
     Sequence {
     Int z;
     } inner;
     } outer;
     } case_2;
     

    Serialize by reading the first row of outer and storing the values. Do not evaluate the CE [serialize_parent_part_one]. Call serialize() for inner and read each row for it, evaluating the CE for each row that is read. After the first row of inner is read and satisfies the CE, write out the SOI marker and values for outer [serialize_parent_part_two], then write the SOI and values for the first row of inner. Continue to read and send rows of inner until the last row has been read. Send EOS for inner [serialize_leaf]. Now read the next row of outer and repeat. Once outer is completely read, send its EOS marker.

Notes:

  1. For a nested Sequence, the child sequence must follow all other types in the parent sequence (like the example). There may be only one nested Sequence per level.

  2. CE evaluation happens only in a leaf sequence.

  3. When no data satisfies a CE, the empty Sequence is signaled by a single EOS marker, regardless of the level of nesting of Sequences. That is, the EOS marker is sent for only the outer Sequence in the case of a completely empty response.

Reimplemented from libdap::Constructor.

Definition at line 676 of file Sequence.cc.

void libdap::BaseType::set_attr_table ( const AttrTable at) [virtual, inherited]

Set this variable's attribute table.

Parameters:
atSource of the attributes.

Definition at line 530 of file BaseType.cc.

void libdap::Constructor::set_in_selection ( bool  state) [virtual, inherited]

Set the in_selection property.

Set the in_selection property for this variable and all of its children.

Parameters:
stateSet the property value to state.

Reimplemented from libdap::BaseType.

Definition at line 806 of file Constructor.cc.

void libdap::Sequence::set_leaf_sequence ( int  lvl = 1) [virtual]

Mark the Sequence which holds the leaf elements.

In a nested Sequence, the Sequence which holds the leaf elements is special because it during the serialization of this Sequence's data that constraint Expressions must be evaluated. If CEs are evaluated at the upper levels, then valid data may not be sent because it was effectively hidden from the serialization and evaluation code (see the documentation for the serialize_leaf() method).

The notion of the leaf Sequence needs to be modified to mean the lowest level of a Sequence where data are to be sent. Suppose there's a two level Sequence, but that only fields from the top level are to be sent. Then that top level is also the leaf Sequence and should be marked as such. If the lower level is marked as a leaf Sequence, then no values will ever be sent since the send_p property will always be false for each field and it's the call to serialize_leaf() that actually triggers transmission of values (because it's not until the code makes it into serialize_leaf() that it knows there are values to be sent.

Note:
This method must not be called before the CE is parsed.
Parameters:
lvlThe current level of the Sequence. a lvl of 1 indicates the topmost Sequence. The default value is 1.
See also:
Sequence::serialize_leaf()

Definition at line 1305 of file Sequence.cc.

virtual void libdap::BaseType::set_length ( int  ) [inline, virtual, inherited]

Set the number of elements for this variable.

Todo:
change param type to int64_t
Parameters:
lThe number of elements

Reimplemented in libdap::Vector, and libdap::D4Sequence.

Definition at line 213 of file BaseType.h.

void libdap::BaseType::set_name ( const string &  n) [virtual, inherited]

Sets the name of the class instance.

Reimplemented in libdap::Vector.

Definition at line 284 of file BaseType.cc.

void libdap::BaseType::set_parent ( BaseType parent) [virtual, inherited]

Set the parent property for this variable.

Note:
Added ability to set parent to null. 10/19/12 jhrg
Parameters:
parentPointer to the Constructor of Vector parent variable or null if the variable has no parent (if it is at the top-level of a DAP2/3 DDS).
Exceptions:
InternalErrthrown if called with anything other than a Constructor, Vector or Null.

Definition at line 649 of file BaseType.cc.

void libdap::Constructor::set_read_p ( bool  state) [virtual, inherited]

Sets the value of the read_p property.

Sets the value of the read_p property. This indicates that the value(s) of this variable has/have been read. An implementation of the read() method should use this to set the read_p property to true.

Note:
If the is_synthesized property is true, this method will _not_ alter the is_read property. If you need that behavior, specialize the method in your subclasses if the various types.
For most of the types the default implementation of this method is fine. However, if you're building a server which must handle data represented using nested sequences, then you may need to provide a specialization of Sequence::set_read_p(). By default Sequence::set_read_p() recursively sets the read_p property for all child variables to state. For servers where one Sequence reads an outer set of values and another reads an inner set, this is cumbersome. In such a case, it is easier to specialize Sequence::set_read_p() so that it does not recursively set the read_p property for the inner Sequence. Be sure to see the documentation for the read() method!
Todo:
Look at making synthesized variables easier to implement and at making them more integrated into the overall CE evaluation process. Maybe the code that computes the synthesized var's value should be in the that variable's read() method? This might provide a way to get rid of the awkward 'projection functions' by replacing them with real children of BaseType. It would also provide a way to clean up the way the synthesized_p prop intrudes on the read_p prop.
See also:
BaseType::read()
Parameters:
stateSet the read_p property to this state.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 193 of file Constructor.cc.

void libdap::Sequence::set_row_number_constraint ( int  start,
int  stop,
int  stride = 1 
) [virtual]

Set the start, stop and stride for a row-number type constraint. This should be used only when the sequence is constrained using the bracket notation (which supplies start, stride and stop information). If omitted, the stride defaults to 1.

Parameters:
startThe starting row number. The first row is row zero.
stopThe ending row number. The 20th row is row 19.
strideThe stride. A stride of two skips every other row.

Definition at line 1175 of file Sequence.cc.

void libdap::Constructor::set_send_p ( bool  state) [virtual, inherited]

Sets the value of the send_p flag. This function is meant to be called from within the constraint evaluator of other code which determines that this variable should be returned to the client. Data are ready to be sent when both the d_is_send and d_is_read flags are set to TRUE.

Parameters:
stateThe logical state to set the send_p flag.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 183 of file Constructor.cc.

void libdap::BaseType::set_synthesized_p ( bool  state) [virtual, inherited]

Set the synthesized flag. Before setting this flag be sure to set the read_p() state. Once this flag is set you cannot alter the state of the read_p flag!

See also:
synthesized_p()

Definition at line 403 of file BaseType.cc.

void libdap::BaseType::set_type ( const Type t) [virtual, inherited]

Sets the type of the class instance.

Definition at line 312 of file BaseType.cc.

void libdap::Sequence::set_unsent_data ( bool  usd) [inline]

Set the unsent data property.

Definition at line 279 of file Sequence.h.

void libdap::Sequence::set_value ( SequenceValues values) [virtual]

Set value of this Sequence. This does not perform a deep copy, so data should be allocated on the heap and freed only when the Sequence dtor is called.

See also:
SequenceValues
BaseTypeRow
Parameters:
valuesSet the value of this Sequence.

Definition at line 332 of file Sequence.cc.

bool libdap::BaseType::synthesized_p ( ) [virtual, inherited]

Returns true if the variable is a synthesized variable. A synthesized variable is one that is added to the dataset by the server (usually with a `projection function'.

Definition at line 392 of file BaseType.cc.

string libdap::Sequence::toString ( ) [virtual]

Write out the object's internal fields in a string. To be used for debugging when regular inspection w/ddd or gdb isn't enough.

Returns:
A string which shows the object's internal stuff.

Reimplemented from libdap::BaseType.

Definition at line 272 of file Sequence.cc.

void libdap::BaseType::transfer_attributes ( AttrTable at_container) [virtual, inherited]

Transfer attributes from a DAS object into this variable. Because of the rough history of the DAS object and the way that various server code built the DAS, this is necessarily a heuristic process. The intent is that this method will be overridden by handlers that need to look for certain patterns in the DAS (e.g., hdf4's odd variable_dim_n; where n = 0, 1, 2, ...) attribute containers.

There should be a one-to-one mapping between variables and attribute containers. However, in some cases one variable has attributes spread across several top level containers and in some cases one container is used by several variables

Note:
This method is technically unnecessary because a server (or client) can easily add attributes directly using the DDS::get_attr_table or BaseType::get_attr_table methods and then poke values in using any of the methods AttrTable provides. This method exists to ease the transition to DDS objects which contain attribute information for the existing servers (Since they all make DAS objects separately from the DDS). They could be modified to use the same AttrTable methods but operate on the AttrTable instances in a DDS/BaseType instead of those in a DAS.
Parameters:
at_containerTransfer attributes from this container.
Returns:
void

Reimplemented in libdap::Grid.

Definition at line 584 of file BaseType.cc.

BaseType * libdap::Sequence::transform_to_dap4 ( D4Group root,
Constructor container 
) [virtual]

Build a D4Sequence from a DAP2 Sequence.

Because DAP4 uses a different type for sequences, this code must be subclassed by anything other than trivial test code or client side-only uses of the library.

Note:
This version of transformto_dap4() builds a new type of object, so it must be subclassed.
Parameters:
rootUse this as the environment for D4Dimensions
containerLoad the result into this container
Returns:
The new D4Sequence

Reimplemented from libdap::Constructor.

Definition at line 211 of file Sequence.cc.

Type libdap::BaseType::type ( ) const [virtual, inherited]

Returns the type of the class instance.

Definition at line 305 of file BaseType.cc.

string libdap::BaseType::type_name ( ) const [virtual, inherited]

Returns the type of the class instance as a string.

Definition at line 319 of file BaseType.cc.

virtual unsigned int libdap::Constructor::val2buf ( void *  val,
bool  reuse 
) [inline, virtual, inherited]

Loads class data.

Store the value pointed to by val in the object's internal buffer. This function does not perform any checks, so users must be sure that the thing pointed to can actually be stored in the object's buffer.

Only simple objects (Int, Float, Byte, and so on) and arrays of these simple objects may be stored using this function. To put data into more complex constructor types, use the functions provided by that class.

Deprecated:
Use set_value() in the leaf classes.
Parameters:
valA pointer to the data to be inserted into the class data buffer.
reuseA boolean value, indicating whether the class internal data storage can be reused or not. If this argument is TRUE, the class buffer is assumed to be large enough to hold the incoming data, and it is not reallocated. If FALSE, new storage is allocated. If the internal buffer has not been allocated at all, this argument has no effect. This is currently used only in the Vector class.
Returns:
The size (in bytes) of the information copied from val.
See also:
Grid
Vector::val2buf

Implements libdap::BaseType.

Definition at line 115 of file Constructor.h.

Get the value for this sequence.

Returns:
The SequenceValues object for this Sequence.

Definition at line 339 of file Sequence.cc.

Get the value for this sequence.

Returns:
The SequenceValues object for this Sequence.

Definition at line 347 of file Sequence.cc.

BaseType * libdap::Constructor::var ( const string &  name,
bool  exact_match = true,
btp_stack *  s = 0 
) [virtual, inherited]

btp_stack no longer needed; use back pointers (BaseType::get_parent())

Reimplemented from libdap::BaseType.

Definition at line 242 of file Constructor.cc.

BaseType * libdap::Constructor::var ( const string &  n,
btp_stack &  s 
) [virtual, inherited]
Deprecated:
Deprecated:
See comment in BaseType

Reimplemented from libdap::BaseType.

Definition at line 254 of file Constructor.cc.

Constructor::Vars_iter libdap::Constructor::var_begin ( ) [inherited]

Returns an iterator referencing the first structure element.

Definition at line 331 of file Constructor.cc.

Constructor::Vars_iter libdap::Constructor::var_end ( ) [inherited]

Returns an iterator referencing the end of the list of structure elements. Does not reference the last structure element.

Definition at line 339 of file Constructor.cc.

Constructor::Vars_riter libdap::Constructor::var_rbegin ( ) [inherited]

Return a reverse iterator that references the last element.

Definition at line 346 of file Constructor.cc.

Constructor::Vars_riter libdap::Constructor::var_rend ( ) [inherited]

Return a reverse iterator that references a point 'before' the first element.

Definition at line 354 of file Constructor.cc.

BaseType * libdap::Sequence::var_value ( size_t  row,
const string &  name 
) [virtual]

Get the BaseType pointer to the named variable of a given row.

Parameters:
rowRead from row in the sequence.
nameReturn name from row.
Returns:
A BaseType which holds the variable and its value.
See also:
number_of_rows

Definition at line 358 of file Sequence.cc.

BaseType * libdap::Sequence::var_value ( size_t  row,
size_t  i 
) [virtual]

Get the BaseType pointer to the $i^{th}$ variable of row.

Parameters:
rowRead from row in the sequence.
iReturn the $i^{th}$ variable from row.
Returns:
A BaseType which holds the variable and its value.
See also:
number_of_rows

Definition at line 380 of file Sequence.cc.

unsigned int libdap::Constructor::width ( bool  constrained = false) const [virtual, inherited]

This version of width simply returns the same thing as width() for simple types and Arrays. For Structure it returns the total size if constrained is false, or the size of the elements in the current projection if true.

Parameters:
constrainedIf true, return the size after applying a constraint.
Returns:
The number of bytes used by the variable.

Reimplemented from libdap::BaseType.

Definition at line 224 of file Constructor.cc.


The documentation for this class was generated from the following files: