Package com.icl.saxon.expr
Class ContextNodeExpression
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.SingletonExpression
com.icl.saxon.expr.ContextNodeExpression
This class represents the expression ".", which always returns the context node.
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Field Summary
Fields inherited from class com.icl.saxon.expr.Expression
staticContext
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
display
(int level) Diagnostic print of expression structureint
Determine which aspects of the context the expression depends on.Return the node selected by this expression.Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.Methods inherited from class com.icl.saxon.expr.SingletonExpression
enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, isContextDocumentNodeSet, selectFirst
Methods inherited from class com.icl.saxon.expr.NodeSetExpression
evaluate, getDataType, outputStringValue
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, simplify, usesCurrent
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Constructor Details
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ContextNodeExpression
public ContextNodeExpression()
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Method Details
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getNode
Return the node selected by this expression.- Specified by:
getNode
in classSingletonExpression
- Parameters:
context
- The context for the evaluation- Returns:
- one NodeInfo only, namely the current node defined by the context
- Throws:
XPathException
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getDependencies
public int getDependencies()Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE- Specified by:
getDependencies
in classExpression
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reduce
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.- Specified by:
reduce
in classExpression
- Parameters:
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation- Returns:
- a new expression that does not have any of the specified dependencies
- Throws:
XPathException
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display
public void display(int level) Diagnostic print of expression structure- Specified by:
display
in classExpression
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