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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.expr.FunctionCall
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+--net.sf.saxon.functions.SystemFunction
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+--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 |
locationId, staticProperties |
| Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
| 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(StaticContext env)
Simplify and validate. |
| Methods inherited from class net.sf.saxon.functions.SystemFunction |
addContextDocumentArgument, checkArguments, computeCardinality, display, getDetails, getItemType, getRequiredType, main, makeSystemFunction, setDetails, useContextItemAsDefault |
| Methods inherited from class net.sf.saxon.expr.FunctionCall |
analyze, checkArgumentCount, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, preEvaluate, promote, setArguments, setFunctionNameCode, simplifyArguments |
| 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(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class FunctionCallXPathException - if an error is discovered during expression
rewritingpublic int computeSpecialProperties()
computeSpecialProperties in class ComputedExpression
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
public SequenceIterator iterate(XPathContext c)
throws XPathException
ComputedExpression
iterate in interface Expressioniterate in class ComputedExpressionc - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
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