org.apache.commons.jexl2
Class MapContext

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

All Implemented Interfaces:

JexlContext

public class MapContext
extends Object
implements JexlContext

Wraps a map in a context.

Each entry in the map is considered a variable name, value pair.

Field Summary

protected Map<String,Object>

map The wrapped variable map.

Constructor Summary

MapContext()
Creates a MapContext on an automatically allocated underlying HashMap.

MapContext(Map<String,Object> vars)
Creates a MapContext wrapping an existing user provided map.

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) Sets the value of a variable.

Methods inherited from class java.lang.Object

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

Field Detail

map

protected final Map<String,Object> map

The wrapped variable map.

Constructor Detail

MapContext

public MapContext()

Creates a MapContext on an automatically allocated underlying HashMap.

MapContext

public MapContext(Map<String,Object> vars)

Creates a MapContext wrapping an existing user provided map.

Parameters:

vars - the variable map

Method Detail

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

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)

Sets the value of a variable.

Specified by:

set in interface JexlContext

Parameters:

name - the variable's name

value - the variable's value