public class ErrorExpression extends ComputedExpression
locationId, staticProperties
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
Constructor and Description |
---|
ErrorExpression(XPathException exception)
Constructor
|
Modifier and Type | Method and Description |
---|---|
int |
computeCardinality()
Determine the static cardinality
|
void |
display(int level,
NamePool pool,
PrintStream out)
Diagnostic print of expression structure
|
Item |
evaluateItem(XPathContext context)
Evaluate the expression.
|
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible
|
SequenceIterator |
iterate(XPathContext context)
Iterate over the expression.
|
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
|
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression.
|
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, simplify, suppressValidation, typeError, typeError
public ErrorExpression(XPathException exception)
exception
- the error found when parsing this expressionpublic Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException
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 Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- supplies the context for evaluationXPathException
- if any dynamic error occurs evaluating the
expressionpublic ItemType getItemType(TypeHierarchy th)
th
- public int computeCardinality()
computeCardinality
in class ComputedExpression
public 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