public class SuppliedParameterReference extends ComputedExpression
Modifier and Type | Field and Description |
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(package private) int |
slotNumber |
locationId, staticProperties
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
Constructor and Description |
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SuppliedParameterReference(int slot)
Constructor
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Modifier and Type | Method and Description |
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int |
computeCardinality()
Get the static cardinality
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void |
display(int level,
NamePool pool,
PrintStream out)
Diagnostic print of expression structure
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boolean |
equals(Object other)
Test if this expression is the same as another expression.
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Item |
evaluateItem(XPathContext c)
Evaluate an expression as a single item.
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible.
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SequenceIterator |
iterate(XPathContext c)
Get the value of this expression in a given context.
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Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression |
simplify(StaticContext env)
Simplify the expression.
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Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Perform type checking of an expression and its subexpressions.
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adoptChildExpression, checkPermittedContents, computeDependencies, computeSpecialProperties, computeStaticProperties, doPromotion, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterateSubExpressions, markTailFunctionCalls, process, promote, resetStaticProperties, setLocationId, setParentExpression, suppressValidation, typeError, typeError
public SuppliedParameterReference(int slot)
slot
- identifies this parameterpublic Expression simplify(StaticContext env)
simplify
in interface Expression
simplify
in class ComputedExpression
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException
Expression
This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.
env
- the static context of the expressioncontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
StaticError
- if an error is discovered during this phase
(typically a type error)XPathException
public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException
Expression
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
opt
- the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.env
- the static context of the expressioncontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
StaticError
- if an error is discovered during this phase
(typically a type error)XPathException
public ItemType getItemType(TypeHierarchy th)
th
- public int computeCardinality()
computeCardinality
in class ComputedExpression
public boolean equals(Object other)
public SequenceIterator iterate(XPathContext c) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
c
- the XPathContext which contains the relevant variable bindingsXPathException
- if the variable is undefinedpublic Item evaluateItem(XPathContext c) throws XPathException
ComputedExpression
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
c
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic void display(int level, NamePool pool, PrintStream out)
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination