com.icl.saxon.expr

Class AttributeValueTemplate


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.

Field Summary

Fields inherited from class com.icl.saxon.expr.Expression

staticContext

Method Summary

void
display(int level)
Diagnostic print of expression structure
Value
evaluate(Context context)
Evaluate an AVT.
String
evaluateAsString(Context context)
Evaluate an expression as a String.
int
getDataType()
Determine the data type of the expression, if possible
int
getDependencies()
Determine which aspects of the context the expression depends on.
static Expression
make(String avt, StaticContext env)
Static factory method to create an AVT from an XSL string representation
Expression
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, display, enumerate, evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getDataType, getDependencies, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, reduce, setStaticContext, simplify, usesCurrent

Method Details

display

public void display(int level)
Diagnostic print of expression structure
Overrides:
display in interface Expression


evaluate

public Value evaluate(Context context)
            throws XPathException
Evaluate an AVT.
Overrides:
evaluate in interface Expression

Parameters:
context - The context in which the AVT is to be evaluated

Returns:
the value of the AVT, evaluated in the current context


evaluateAsString

public String evaluateAsString(Context context)
            throws XPathException
Evaluate an expression as a String.
Overrides:
evaluateAsString in interface Expression

Parameters:
context - The context in which the expression is to be evaluated

Returns:
the value of the expression, evaluated in the current context


getDataType

public int getDataType()
Determine the data type of the expression, if possible
Overrides:
getDataType in interface Expression

Returns:
Value.STRING


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
Overrides:
getDependencies in interface Expression


make

public static Expression make(String avt,
                              StaticContext env)
            throws XPathException
Static factory method to create an AVT from an XSL string representation
Overrides:
make in interface Expression


reduce

public Expression reduce(int dependencies,
                         Context context)
            throws XPathException
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
Overrides:
reduce in interface Expression

Parameters:
dependencies - The dependencies to be removed
context - The context to be used for the partial evaluation

Returns:
a new expression that does not have any of the specified dependencies


simplify

public Expression simplify()
            throws XPathException
Simplify an expression.
Overrides:
simplify in interface Expression

Returns:
the simplified expression