001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.util.bridges.mvc;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.util.InstanceFactory;
020    import com.liferay.portal.kernel.util.StringBundler;
021    import com.liferay.portal.kernel.util.StringPool;
022    import com.liferay.portal.kernel.util.StringUtil;
023    
024    import java.util.ArrayList;
025    import java.util.List;
026    import java.util.Map;
027    import java.util.concurrent.ConcurrentHashMap;
028    
029    import javax.portlet.PortletRequest;
030    import javax.portlet.PortletResponse;
031    
032    /**
033     * @author Michael C. Han
034     */
035    public class ActionCommandCache {
036    
037            public static final String ACTION_PACKAGE_NAME = "action.package.prefix";
038    
039            public static final ActionCommand EMPTY = new ActionCommand() {
040    
041                    @Override
042                    public boolean processCommand(
043                            PortletRequest portletRequest, PortletResponse portletResponse) {
044    
045                            return false;
046                    }
047    
048            };
049    
050            public ActionCommandCache(String packagePrefix) {
051                    if (!packagePrefix.endsWith(StringPool.PERIOD)) {
052                            packagePrefix = packagePrefix + StringPool.PERIOD;
053                    }
054    
055                    _packagePrefix = packagePrefix;
056            }
057    
058            public ActionCommand getActionCommand(String actionCommandName) {
059                    String className = null;
060    
061                    try {
062                            ActionCommand actionCommand = _actionCommandCache.get(
063                                    actionCommandName);
064    
065                            if (actionCommand != null) {
066                                    return actionCommand;
067                            }
068    
069                            StringBundler sb = new StringBundler(4);
070    
071                            sb.append(_packagePrefix);
072                            sb.append(Character.toUpperCase(actionCommandName.charAt(0)));
073                            sb.append(actionCommandName.substring(1));
074                            sb.append(_ACTION_COMMAND_POSTFIX);
075    
076                            className = sb.toString();
077    
078                            actionCommand = (ActionCommand)InstanceFactory.newInstance(
079                                    className);
080    
081                            _actionCommandCache.put(actionCommandName, actionCommand);
082    
083                            return actionCommand;
084                    }
085                    catch (Exception e) {
086                            if (_log.isWarnEnabled()) {
087                                    _log.warn("Unable to instantiate ActionCommand " + className);
088                            }
089    
090                            _actionCommandCache.put(actionCommandName, EMPTY);
091    
092                            return EMPTY;
093                    }
094            }
095    
096            public List<ActionCommand> getActionCommandChain(
097                    String actionCommandChain) {
098    
099                    List<ActionCommand> actionCommands = _actionCommandChainCache.get(
100                            actionCommandChain);
101    
102                    if (actionCommands != null) {
103                            return actionCommands;
104                    }
105    
106                    actionCommands = new ArrayList<ActionCommand>();
107    
108                    String[] actionCommandNames = StringUtil.split(actionCommandChain);
109    
110                    for (String actionCommandName : actionCommandNames) {
111                            ActionCommand actionCommand = getActionCommand(actionCommandName);
112    
113                            if (actionCommand != EMPTY) {
114                                    actionCommands.add(actionCommand);
115                            }
116                            else {
117                                    if (_log.isWarnEnabled()) {
118                                            _log.warn(
119                                                    "Unable to find ActionCommand " + actionCommandChain);
120                                    }
121                            }
122                    }
123    
124                    _actionCommandChainCache.put(actionCommandChain, actionCommands);
125    
126                    return actionCommands;
127            }
128    
129            public boolean isEmpty() {
130                    return _actionCommandCache.isEmpty();
131            }
132    
133            private static final String _ACTION_COMMAND_POSTFIX = "ActionCommand";
134    
135            private static Log _log = LogFactoryUtil.getLog(ActionCommandCache.class);
136    
137            private Map<String, ActionCommand> _actionCommandCache =
138                    new ConcurrentHashMap<String, ActionCommand>();
139            private Map<String, List<ActionCommand>> _actionCommandChainCache =
140                    new ConcurrentHashMap<String, List<ActionCommand>>();
141            private String _packagePrefix;
142    
143    }