Package org.apache.commons.jxpath.ri.compiler

Class Constant

java.lang.Object

org.apache.commons.jxpath.ri.compiler.Expression

org.apache.commons.jxpath.ri.compiler.Constant

public class Constant
extends Expression

A compile tree element containing a constant number or string.

Version:

$Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $

Author:

Dmitri Plotnikov

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.jxpath.ri.compiler.Expression

Expression.PointerIterator, Expression.ValueIterator

Field Summary

Fields

Modifier and Type	Field	Description
private java.lang.Object	value

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression

NOT_A_NUMBER, ONE, ZERO

Constructor Summary

Constructors

Constructor	Description
Constant(java.lang.Number number)	Create a new Constant.
Constant(java.lang.String string)	Create a new Constant.

Method Summary

Modifier and Type	Method	Description
java.lang.Object	compute(EvalContext context)	Evaluates the expression.
boolean	computeContextDependent()	Returns false
java.lang.Object	computeValue(EvalContext context)	Evaluates the expression.
boolean	isContextDependent()	Returns false
java.lang.String	toString()

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression

iterate, iteratePointers

Methods inherited from class java.lang.Object

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

Field Detail

value

private java.lang.Object value

Constructor Detail

Constant

public Constant(java.lang.Number number)

Create a new Constant.

Parameters:

number - constant

Constant

public Constant(java.lang.String string)

Create a new Constant.

Parameters:

string - constant

Method Detail

compute

public java.lang.Object compute(EvalContext context)

Description copied from class: Expression

Evaluates the expression. If the result is a node set, returns the first element of the node set.

Specified by:

compute in class Expression

Parameters:

context - evaluation context

Returns:

Object

computeValue

public java.lang.Object computeValue(EvalContext context)

Description copied from class: Expression

Evaluates the expression. If the result is a node set, returns the first element of the node set.

Specified by:

computeValue in class Expression

Parameters:

context - evaluation context

Returns:

Object

isContextDependent

public boolean isContextDependent()

Returns false

Overrides:

isContextDependent in class Expression

Returns:

false

computeContextDependent

public boolean computeContextDependent()

Returns false

Specified by:

computeContextDependent in class Expression

Returns:

false

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object