org.apache.commons.jexl2
Class ReadonlyContext

java.lang.Object
  org.apache.commons.jexl2.ReadonlyContext

All Implemented Interfaces:

JexlContext

public final class ReadonlyContext
extends Object
implements JexlContext

A readonly context wrapper.

Since:

2.1

Constructor Summary

ReadonlyContext(JexlContext context)
Creates a new readonly context.

Method Summary

Object	get(String name) Gets the value of a variable.
boolean	has(String name) Checks whether a variable is defined in this context.
void	set(String name, Object value) Will throw an UnsupportedOperationException when called; the JexlEngine deals with it appropriately.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReadonlyContext

public ReadonlyContext(JexlContext context)

Creates a new readonly context.

Parameters:

context - the wrapped context

Method Detail

get

public Object get(String name)

Gets the value of a variable.

Specified by:

get in interface JexlContext

Parameters:

name - the variable's name

Returns:

the value

set

public void set(String name,
                Object value)

Will throw an UnsupportedOperationException when called; the JexlEngine deals with it appropriately.

Specified by:

set in interface JexlContext

Parameters:

name - the unused variable name

value - the unused variable value

has

public boolean has(String name)

Checks whether a variable is defined in this context.

A variable may be defined with a null value; this method checks whether the value is null or if the variable is undefined.

Specified by:

has in interface JexlContext

Parameters:

name - the variable's name

Returns:

true if it exists, false otherwise