001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
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.CharPool;
020    import com.liferay.portal.kernel.util.StringBundler;
021    import com.liferay.portal.kernel.util.StringPool;
022    
023    import java.util.ArrayList;
024    import java.util.List;
025    import java.util.Map;
026    import java.util.concurrent.ConcurrentHashMap;
027    
028    import javax.portlet.PortletRequest;
029    import javax.portlet.PortletResponse;
030    
031    /**
032     * @author Michael C. Han
033     */
034    public class ActionCommandCache {
035    
036            public static final String ACTION_PACKAGE_NAME = "action.package.prefix";
037    
038            public static final ActionCommand EMPTY = new ActionCommand() {
039    
040                    public boolean processCommand(
041                            PortletRequest portletRequest, PortletResponse portletResponse) {
042    
043                            return false;
044                    }
045    
046            };
047    
048            public ActionCommandCache(String packagePrefix) {
049                    if (!packagePrefix.endsWith(StringPool.PERIOD)) {
050                            packagePrefix = packagePrefix + StringPool.PERIOD;
051                    }
052    
053                    _packagePrefix = packagePrefix;
054            }
055    
056            public ActionCommand getActionCommand(String actionCommandName) {
057                    String className = null;
058    
059                    try {
060                            ActionCommand actionCommand = _actionCommandCache.get(
061                                    actionCommandName);
062    
063                            if (actionCommand == null) {
064                                    StringBundler sb = new StringBundler(4);
065    
066                                    sb.append(_packagePrefix);
067                                    sb.append(Character.toUpperCase(actionCommandName.charAt(0)));
068                                    sb.append(
069                                            actionCommandName.substring(1, actionCommandName.length()));
070                                    sb.append(_ACTION_COMMAND_POSTFIX);
071    
072                                    className = sb.toString();
073    
074                                    actionCommand =
075                                            (ActionCommand)Class.forName(className).newInstance();
076    
077                                    _actionCommandCache.put(actionCommandName, actionCommand);
078                            }
079    
080                            return actionCommand;
081                    }
082                    catch (Exception e) {
083                            if (_log.isWarnEnabled()) {
084                                    _log.warn("Unable to instantiate ActionCommand " + className);
085                            }
086    
087                            _actionCommandCache.put(actionCommandName, EMPTY);
088    
089                            return EMPTY;
090                    }
091            }
092    
093            public List<ActionCommand> getActionCommandChain(
094                    String actionCommandChain) {
095    
096                    List<ActionCommand> actionCommands = _actionCommandChainCache.get(
097                            actionCommandChain);
098    
099                    if (actionCommands == null) {
100                            actionCommands = new ArrayList<ActionCommand>();
101    
102                            int nextSeparator = actionCommandChain.indexOf(CharPool.COMMA);
103    
104                            int currentIndex = 0;
105    
106                            while (currentIndex < actionCommandChain.length()) {
107                                    String parsedName = actionCommandChain.substring(
108                                            currentIndex, nextSeparator);
109    
110                                    ActionCommand actionCommand = getActionCommand(
111                                            parsedName);
112    
113                                    if (actionCommand != EMPTY) {
114                                            actionCommands.add(actionCommand);
115                                    }
116                                    else {
117                                            if (_log.isWarnEnabled()) {
118                                                    _log.warn(
119                                                            "Unable to find ActionCommand " +
120                                                                    actionCommandChain);
121                                            }
122                                    }
123    
124                                    currentIndex = nextSeparator + 1;
125    
126                                    nextSeparator = actionCommandChain.indexOf(
127                                            CharPool.COMMA, currentIndex);
128    
129                                    if (nextSeparator == -1) {
130                                            break;
131                                    }
132                            }
133    
134                            _actionCommandChainCache.put(actionCommandChain, actionCommands);
135                    }
136    
137                    return actionCommands;
138            }
139    
140            public boolean isEmpty() {
141                    return _actionCommandCache.isEmpty();
142            }
143    
144            private static final String _ACTION_COMMAND_POSTFIX = "ActionCommand";
145    
146            private static Log _log = LogFactoryUtil.getLog(ActionCommandCache.class);
147    
148            private Map<String, ActionCommand> _actionCommandCache =
149                    new ConcurrentHashMap<String, ActionCommand>();
150            private Map<String, List<ActionCommand>> _actionCommandChainCache =
151                    new ConcurrentHashMap<String, List<ActionCommand>>();
152            private String _packagePrefix;
153    
154    }