Package com.icl.saxon.functions
Class Current
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.Function
com.icl.saxon.functions.Current
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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 TypeMethodDescriptionEvaluate in a general contextEvaluate the function in a node-set contextint
Determine the data type of the expressionint
Determine the dependenciesgetName()
Function name (for diagnostics)boolean
Determine, in the case of an expression whose data type is Value.NODESET, whether all the nodes in the node-set are guaranteed to come from the same document as the context node.Reduce the dependenciessimplify()
Simplify and validate.Methods inherited from class com.icl.saxon.expr.Function
addArgument, checkArgumentCount, display, getNumberOfArguments
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNumber, evaluateAsString, getStaticContext, indent, make, outputStringValue, setStaticContext, usesCurrent
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Constructor Details
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Current
public Current()
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Method Details
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getName
Function name (for diagnostics) -
getDataType
public int getDataType()Determine the data type of the expression- Specified by:
getDataType
in classExpression
- Returns:
- Value.NODESET
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isContextDocumentNodeSet
public boolean isContextDocumentNodeSet()Determine, in the case of an expression whose data type is Value.NODESET, whether all the nodes in the node-set are guaranteed to come from the same document as the context node. Used for optimization.- Overrides:
isContextDocumentNodeSet
in classExpression
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simplify
Simplify and validate.- Overrides:
simplify
in classExpression
- Returns:
- the simplified expression
- Throws:
XPathException
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evaluateAsNodeSet
Evaluate the function in a node-set context- Overrides:
evaluateAsNodeSet
in classExpression
- Parameters:
c
- The context in which the expression is to be evaluated- Returns:
- the value of the expression, evaluated in the current context. Note that the result is not necessarily in document order; to get it into document order, call sort() on the result.
- Throws:
XPathException
- when the expression does not return a nodeset.
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evaluate
Evaluate in a general context- Specified by:
evaluate
in classExpression
- Parameters:
c
- The context in which the expression is to be evaluated- Returns:
- the value of the expression, evaluated in the current context
- Throws:
XPathException
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getDependencies
public int getDependencies()Determine the dependencies- Specified by:
getDependencies
in classExpression
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reduce
Reduce the dependencies- Specified by:
reduce
in classExpression
- Parameters:
dep
- The dependencies to be removed, e.g. Context.VARIABLESc
- The context to be used for the partial evaluation- Returns:
- a new expression (or Value) that does not have any of the specified dependencies
- Throws:
XPathException
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