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: Class AttributeValueTemplate

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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

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.

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.

java.lang.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(java.lang.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, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, getStaticContext, indent, isContextDocumentNodeSet, outputStringValue, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

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

Following copied from class: com.icl.saxon.expr.Expression

Parameters:: expression - The expression (as a character string); env - An object giving information about the compile-time context of the expression
Returns:: an object of type Expression

simplify


public Expression simplify()
                    throws XPathException

Simplify an expression.

Overrides:: simplify in class Expression

Returns:: the simplified expression

evaluate


public Value evaluate(Context context)
               throws XPathException

Evaluate an AVT.

Overrides:: evaluate in class Expression

Parameters:: context - The context in which the AVT is to be evaluated
Returns:: the value of the AVT, evaluated in the current context

getDataType


public int getDataType()

Determine the data type of the expression, if possible

Overrides:: getDataType in class Expression

Returns:: Value.STRING

evaluateAsString


public java.lang.String evaluateAsString(Context context)
                                  throws XPathException

Evaluate an expression as a String.

Overrides:: evaluateAsString in class Expression

Parameters:: context - The context in which the expression is to be evaluated
Returns:: the value of the expression, evaluated in the current context

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 class 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 class 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

display


public void display(int level)

Diagnostic print of expression structure

Overrides:: display in class Expression