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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.FunctionCall | +--net.sf.saxon.functions.SystemFunction | +--net.sf.saxon.functions.Root
Implement the XPath 2.0 root() 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 |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
Root()
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Method Summary | |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
Item |
evaluateItem(XPathContext c)
Evaluate in a general context |
SequenceIterator |
iterate(XPathContext c)
Return an Iterator to iterate over the values of a sequence. |
Expression |
simplify()
Simplify and validate. |
Methods inherited from class net.sf.saxon.functions.SystemFunction |
addContextDocumentArgument, checkArguments, computeCardinality, display, getDetails, getItemType, getName, getRequiredType, main, makeSystemFunction, useContextItemAsDefault |
Methods inherited from class net.sf.saxon.expr.FunctionCall |
analyze, checkArgumentCount, getNumberOfArguments, getSubExpressions, preEvaluate, promote, setArguments, simplifyArguments |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSourceLocator, getSpecialProperties, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public Root()
Method Detail |
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class FunctionCall
XPathException
- if an error is discovered during expression
rewritingpublic int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
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 evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator iterate(XPathContext c) throws XPathException
ComputedExpression
iterate
in interface Expression
iterate
in class ComputedExpression
c
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expression
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