Package com.icl.saxon.expr
Class AttributeReference
- java.lang.Object
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- com.icl.saxon.expr.Expression
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- com.icl.saxon.expr.NodeSetExpression
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- com.icl.saxon.expr.SingletonExpression
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- com.icl.saxon.expr.AttributeReference
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class AttributeReference extends SingletonExpression
An expression that represents a reference to a named attribute
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Field Summary
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Fields inherited from class com.icl.saxon.expr.Expression
staticContext
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Constructor Summary
Constructors Constructor Description AttributeReference(int fingerprint)
Constructor
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
bindParentNode(NodeInfo node)
Bind the reference to a particular nodevoid
display(int level)
Diagnostic print of expression structureboolean
evaluateAsBoolean(Context context)
Evaluate as a boolean.java.lang.String
evaluateAsString(Context context)
Evaluate as a string.int
getDependencies()
Determine which aspects of the context the expression depends on.NodeInfo
getNode(Context context)
Return the relevant attribute nodeExpression
reduce(int dependencies, Context context)
Perform 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
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Methods inherited from class com.icl.saxon.expr.NodeSetExpression
evaluate, getDataType, outputStringValue
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Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, simplify, usesCurrent
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Method Detail
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bindParentNode
public void bindParentNode(NodeInfo node)
Bind the reference to a particular node
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getNode
public NodeInfo getNode(Context context) throws XPathException
Return the relevant attribute node- Specified by:
getNode
in classSingletonExpression
- Parameters:
context
- the evaluation context- Throws:
XPathException
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evaluateAsBoolean
public boolean evaluateAsBoolean(Context context) throws XPathException
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 if there are any nodes selected by the NodeSetExpression
- Throws:
XPathException
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evaluateAsString
public java.lang.String evaluateAsString(Context context) throws XPathException
Evaluate as a string. Returns the string value of the attribute if it exists- Overrides:
evaluateAsString
in classSingletonExpression
- Parameters:
context
- The context in which the expression is to be evaluated- Returns:
- true if there are any nodes selected by the NodeSetExpression
- 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
public Expression reduce(int dependencies, Context context) throws XPathException
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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