org.apache.commons.jxpath
Class BasicVariables

java.lang.Object
  org.apache.commons.jxpath.BasicVariables

All Implemented Interfaces:

Variables

public class BasicVariables

extends java.lang.Object

implements Variables

A basic implementation of the Variables interface that uses a HashMap.

Version:

$Revision: 1.7 $ $Date: 2004/02/29 14:17:42 $

Author:

Dmitri Plotnikov

Field Summary

private java.util.HashMap

vars Contains the values of declared variables

Constructor Summary

BasicVariables()

Method Summary

void	declareVariable(java.lang.String varName, java.lang.Object value) Defines a new variable with the specified value or modifies the value of an existing variable.
java.lang.Object	getVariable(java.lang.String varName) Returns the value of the variable if it is defined, otherwise, throws IllegalArgumentException
boolean	isDeclaredVariable(java.lang.String varName) Returns true if the variable has been defined, even if the value of the variable is null.
java.lang.String	toString()
void	undeclareVariable(java.lang.String varName) Removes an existing variable.

Methods inherited from class java.lang.Object

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

Field Detail

vars

private java.util.HashMap vars

Contains the values of declared variables

Constructor Detail

BasicVariables

public BasicVariables()

Method Detail

isDeclaredVariable

public boolean isDeclaredVariable(java.lang.String varName)

Returns true if the variable has been defined, even if the value of the variable is null.

Specified by:

isDeclaredVariable in interface Variables

Parameters:

varName - is a variable name without the "$" sign

Returns:

true if the variable is declared

getVariable

public java.lang.Object getVariable(java.lang.String varName)

Returns the value of the variable if it is defined, otherwise, throws IllegalArgumentException

Specified by:

getVariable in interface Variables

Parameters:

varName - is a variable name without the "$" sign

Returns:

the value of the variable

declareVariable

public void declareVariable(java.lang.String varName,
                            java.lang.Object value)

Defines a new variable with the specified value or modifies the value of an existing variable.

Specified by:

declareVariable in interface Variables

Parameters:

varName - is a variable name without the "$" sign

value - is the new value for the variable, which can be null

undeclareVariable

public void undeclareVariable(java.lang.String varName)

Removes an existing variable. May throw UnsupportedOperationException.

Specified by:

undeclareVariable in interface Variables

Parameters:

varName - is a variable name without the "$" sign

toString

public java.lang.String toString()