/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.quercus.env;
import java.util.HashMap;
import java.util.Map;
/**
* Represents a PHP chained map
*/
public class ChainedMap<K,V> implements VarMap<K,V> {
private final VarMap<K,V> _next;
private final Map<K,V> _map;
public ChainedMap(VarMap<K,V> next, Map<K,V> map)
{
_next = next;
_map = map;
}
public ChainedMap(VarMap<K,V> next)
{
_next = next;
_map = new HashMap<K,V>();
}
/**
* Sets the value
*/
public void put(K key, V value)
{
_map.put(key, value);
}
/**
* Remove the value
*/
public V remove(K key)
{
return _map.remove(key);
}
/**
* Gets a value.
*/
public V get(K key)
{
V value = _map.get(key);
if (value != null)
return value;
else if (_next != null)
return _next.get(key);
else
return null;
}
}