public class StringLength extends SystemFunction
operation
argument
locationId, staticProperties
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
Constructor and Description |
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StringLength() |
Modifier and Type | Method and Description |
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Item |
evaluateItem(XPathContext c)
Evaluate in a general context
|
int |
getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived
from the dependencies of its subexpressions.
|
Expression |
preEvaluate(StaticContext env)
Pre-evaluate a function at compile time.
|
void |
setShortcut()
setShortCut() - used by optimizer when we only need to know if the length is non-zero
|
Expression |
simplify(StaticContext env)
Simplify and validate.
|
addContextDocumentArgument, checkArguments, computeCardinality, computeSpecialProperties, display, getDetails, getErrorCodeForTypeErrors, getItemType, getRequiredType, main, makeSystemFunction, setDetails, useContextItemAsDefault
checkArgumentCount, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, optimize, promote, setArguments, setFunctionNameCode, simplifyArguments, typeCheck
adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, suppressValidation, typeError, typeError
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class FunctionCall
XPathException
- if an error is discovered during expression
rewritingpublic int getIntrinsicDependencies()
getIntrinsicDependencies
in class ComputedExpression
public Expression preEvaluate(StaticContext env) throws XPathException
preEvaluate
in class FunctionCall
XPathException
public void setShortcut()
public Item evaluateItem(XPathContext c) throws XPathException
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
expression