Package com.icl.saxon.expr
Class AttributeValueTemplate
- java.lang.Object
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- com.icl.saxon.expr.Expression
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- com.icl.saxon.expr.AttributeValueTemplate
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public final class AttributeValueTemplate extends Expression
This class represents an attribute value template. Although it is not technically an expression in the sense of XSL syntax, we model it as an expression for inheritance purposes.
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Field Summary
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Fields inherited from class com.icl.saxon.expr.Expression
staticContext
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
display(int level)
Diagnostic print of expression structureValue
evaluate(Context context)
Evaluate an AVT.java.lang.String
evaluateAsString(Context context)
Evaluate an expression as a String.int
getDataType()
Determine the data type of the expression, if possibleint
getDependencies()
Determine which aspects of the context the expression depends on.static Expression
make(java.lang.String avt, StaticContext env)
Static factory method to create an AVT from an XSL string representationExpression
reduce(int dependencies, Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.Expression
simplify()
Simplify an expression.-
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, getStaticContext, indent, isContextDocumentNodeSet, outputStringValue, setStaticContext, usesCurrent
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Method Detail
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make
public static Expression make(java.lang.String avt, StaticContext env) throws XPathException
Static factory method to create an AVT from an XSL string representation- Throws:
XPathException
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simplify
public Expression simplify() throws XPathException
Simplify an expression.- Overrides:
simplify
in classExpression
- Returns:
- the simplified expression
- Throws:
XPathException
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evaluate
public Value evaluate(Context context) throws XPathException
Evaluate an AVT.- Specified by:
evaluate
in classExpression
- Parameters:
context
- The context in which the AVT is to be evaluated- Returns:
- the value of the AVT, evaluated in the current context
- Throws:
XPathException
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getDataType
public int getDataType()
Determine the data type of the expression, if possible- Specified by:
getDataType
in classExpression
- Returns:
- Value.STRING
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evaluateAsString
public java.lang.String evaluateAsString(Context context) throws XPathException
Evaluate an expression as a String.- Overrides:
evaluateAsString
in classExpression
- Parameters:
context
- 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 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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