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1   /*
2    * Copyright 2004-2009 the Seasar Foundation and the Others.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific language
14   * governing permissions and limitations under the License.
15   */
16  package org.seasar.cubby.action.impl;
17  
18  import java.util.Collection;
19  import java.util.Map;
20  import java.util.Set;
21  import java.util.concurrent.ConcurrentHashMap;
22  
23  import javax.servlet.http.HttpServletRequest;
24  import javax.servlet.http.HttpSession;
25  
26  import org.seasar.cubby.action.FlashMap;
27  import org.seasar.cubby.internal.controller.ThreadContext;
28  
29  /**
30   * {@link FlashMap} の実装です。
31   * 
32   * @author baba
33   */
34  public class FlashMapImpl implements FlashMap {
35  
36  	/** セッションの属性に格納する {@link Map} のキー。 */
37  	private static final String ATTRIBUTE_NAME = FlashMapImpl.class.getName()
38  			+ ".MAP";
39  
40  	/** 要求。 */
41  	private final HttpServletRequest request;
42  
43  	/** 実際に値を格納する {@link Map}。 */
44  	private final Map<String, Object> map;
45  
46  	/**
47  	 * インスタンス化します。
48  	 * <p>
49  	 * 内部で使用する要求は {@link ThreadContext} から取得します。
50  	 * </p>
51  	 */
52  	public FlashMapImpl() {
53  		this(ThreadContext.getRequest());
54  	}
55  
56  	/**
57  	 * インスタンス化します。
58  	 * 
59  	 * @param request
60  	 *            要求
61  	 */
62  	public FlashMapImpl(final HttpServletRequest request) {
63  		this.request = request;
64  		this.map = buildMap(request);
65  	}
66  
67  	private Map<String, Object> buildMap(final HttpServletRequest request) {
68  		final HttpSession session = request.getSession(false);
69  		if (session != null) {
70  			final Map<String, Object> map = getAttribute(session,
71  					ATTRIBUTE_NAME);
72  			if (map != null) {
73  				return map;
74  			}
75  		}
76  		return createMap();
77  	}
78  
79  	protected Map<String, Object> createMap() {
80  		return new ConcurrentHashMap<String, Object>();
81  	}
82  
83  	private void export(final HttpSession session) {
84  		session.setAttribute(ATTRIBUTE_NAME, this.map);
85  	}
86  
87  	/**
88  	 * {@inheritDoc}
89  	 */
90  	public int size() {
91  		return map.size();
92  	}
93  
94  	/**
95  	 * {@inheritDoc}
96  	 */
97  	public boolean isEmpty() {
98  		return map.isEmpty();
99  	}
100 
101 	/**
102 	 * {@inheritDoc}
103 	 */
104 	public boolean containsKey(final Object key) {
105 		return map.containsKey(key);
106 	}
107 
108 	/**
109 	 * {@inheritDoc}
110 	 */
111 	public boolean containsValue(final Object value) {
112 		return map.containsValue(value);
113 	}
114 
115 	/**
116 	 * {@inheritDoc}
117 	 */
118 	public Object get(final Object key) {
119 		return map.get(key);
120 	}
121 
122 	/**
123 	 * {@inheritDoc}
124 	 */
125 	public Object put(final String key, final Object value) {
126 		final Object previousValue = map.put(key, value);
127 		export(request.getSession());
128 		return previousValue;
129 	}
130 
131 	/**
132 	 * {@inheritDoc}
133 	 */
134 	public Object remove(final Object key) {
135 		final Object removedValue = map.remove(key);
136 		final HttpSession session = request.getSession(false);
137 		if (session != null) {
138 			export(session);
139 		}
140 		return removedValue;
141 	}
142 
143 	/**
144 	 * {@inheritDoc}
145 	 */
146 	public void putAll(final Map<? extends String, ? extends Object> t) {
147 		map.putAll(t);
148 		export(request.getSession());
149 	}
150 
151 	/**
152 	 * {@inheritDoc}
153 	 */
154 	public void clear() {
155 		map.clear();
156 		final HttpSession session = request.getSession(false);
157 		if (session != null) {
158 			export(session);
159 		}
160 	}
161 
162 	/**
163 	 * {@inheritDoc}
164 	 */
165 	public Set<String> keySet() {
166 		return map.keySet();
167 	}
168 
169 	/**
170 	 * {@inheritDoc}
171 	 */
172 	public Collection<Object> values() {
173 		return map.values();
174 	}
175 
176 	/**
177 	 * {@inheritDoc}
178 	 */
179 	public Set<Entry<String, Object>> entrySet() {
180 		return map.entrySet();
181 	}
182 
183 	@SuppressWarnings("unchecked")
184 	private static <T> T getAttribute(final HttpSession session,
185 			final String name) {
186 		return (T) session.getAttribute(name);
187 	}
188 
189 }