001// Copyright 2004, 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.hivemind.impl; 016 017import java.util.AbstractMap; 018import java.util.Map; 019import java.util.Set; 020 021import org.apache.hivemind.HiveMind; 022import org.apache.hivemind.events.RegistryShutdownListener; 023 024/** 025 * The Map implementation visible to the client code. It defers to another inner implementation of 026 * Map; initially this is a {@link org.apache.hivemind.impl.ElementsInnerProxyMap}, but the inner 027 * proxy replaces itself with a real Map implementation containing the actual configuration 028 * elements. 029 * 030 * @author Knut Wannheden 031 * @since 1.1 032 */ 033public final class ElementsProxyMap extends AbstractMap implements RegistryShutdownListener 034{ 035 private Map _inner; 036 037 private boolean _shutdown; 038 039 public void registryDidShutdown() 040 { 041 _shutdown = true; 042 _inner = null; 043 } 044 045 private void checkShutdown() 046 { 047 if (_shutdown) 048 throw HiveMind.createRegistryShutdownException(); 049 } 050 051 public Set entrySet() 052 { 053 checkShutdown(); 054 055 return _inner.entrySet(); 056 } 057 058 public String toString() 059 { 060 return _inner.toString(); 061 } 062 063 public boolean equals(Object o) 064 { 065 return _inner.equals(o); 066 } 067 068 public int hashCode() 069 { 070 return _inner.hashCode(); 071 } 072 073 public void setInner(Map map) 074 { 075 _inner = map; 076 } 077 078}