Package com.icl.saxon.expr
Class ParentNodeExpression
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.SingletonExpression
com.icl.saxon.expr.ParentNodeExpression
Class ParentNodeExpression represents the XPath expression ".." or "parent::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 structureboolean
evaluateAsBoolean
(Context context) Evaluate as a boolean.evaluateAsString
(Context context) Evaluate as a string.int
Determine which aspects of the context the expression depends on.Return the node selected by this SingletonExpressionPerform a partial evaluation of the expression, by eliminating specified dependencies on the context.Methods inherited from class com.icl.saxon.expr.SingletonExpression
enumerate, evaluateAsNodeSet, 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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ParentNodeExpression
public ParentNodeExpression()
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Method Details
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getNode
Return the node selected by this SingletonExpression- Specified by:
getNode
in classSingletonExpression
- Parameters:
context
- The context for the evaluation- Returns:
- the parent of 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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evaluateAsString
Evaluate as a string. Returns the string value of the parent node- Overrides:
evaluateAsString
in classSingletonExpression
- Parameters:
context
- The context in which the expression is to be evaluated- Returns:
- the value of the current node, identified by the context
- Throws:
XPathException
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evaluateAsBoolean
Evaluate as a boolean. Returns true if there are any nodes selected by the NodeSetExpression.- Overrides:
evaluateAsBoolean
in classSingletonExpression
- Parameters:
context
- The context in which the expression is to be evaluated- Returns:
- true unless the current node is the Document node
- Throws:
XPathException
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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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