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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.StringLength
Implement the XPath string-length() function
| Field Summary |
| Fields inherited from class net.sf.saxon.functions.SystemFunction |
operation |
| Fields inherited from class net.sf.saxon.expr.FunctionCall |
argument |
| Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
| Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
| Constructor Summary | |
StringLength()
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| Method Summary | |
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. |
| Methods inherited from class net.sf.saxon.functions.SystemFunction |
addContextDocumentArgument, checkArguments, computeCardinality, computeSpecialProperties, display, getDetails, getErrorCodeForTypeErrors, getItemType, getRequiredType, main, makeSystemFunction, setDetails, useContextItemAsDefault |
| Methods inherited from class net.sf.saxon.expr.FunctionCall |
checkArgumentCount, getArguments, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, optimize, promote, replaceSubExpression, setArguments, setFunctionNameCode, simplifyArguments, typeCheck |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public StringLength()
| Method Detail |
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class FunctionCallXPathExceptionpublic int getIntrinsicDependencies()
getIntrinsicDependencies in class ComputedExpression
public Expression preEvaluate(StaticContext env)
throws XPathException
preEvaluate in class FunctionCallXPathExceptionpublic void setShortcut()
public Item evaluateItem(XPathContext c)
throws XPathException
evaluateItem in interface ExpressionevaluateItem in class ComputedExpressionc - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
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