com.liferay.util.bridges.mvc.ActionCommandCache.java Source code

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Here is the source code for com.liferay.util.bridges.mvc.ActionCommandCache.java

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.util.bridges.mvc;

import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.util.InstanceFactory;
import com.liferay.portal.kernel.util.StringBundler;
import com.liferay.portal.kernel.util.StringPool;
import com.liferay.portal.kernel.util.StringUtil;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;

/**
 * @author Michael C. Han
 */
public class ActionCommandCache {

    public static final String ACTION_PACKAGE_NAME = "action.package.prefix";

    public static final ActionCommand EMPTY = new ActionCommand() {

        public boolean processCommand(PortletRequest portletRequest, PortletResponse portletResponse) {

            return false;
        }

    };

    public ActionCommandCache(String packagePrefix) {
        if (!packagePrefix.endsWith(StringPool.PERIOD)) {
            packagePrefix = packagePrefix + StringPool.PERIOD;
        }

        _packagePrefix = packagePrefix;
    }

    public ActionCommand getActionCommand(String actionCommandName) {
        String className = null;

        try {
            ActionCommand actionCommand = _actionCommandCache.get(actionCommandName);

            if (actionCommand != null) {
                return actionCommand;
            }

            StringBundler sb = new StringBundler(4);

            sb.append(_packagePrefix);
            sb.append(Character.toUpperCase(actionCommandName.charAt(0)));
            sb.append(actionCommandName.substring(1, actionCommandName.length()));
            sb.append(_ACTION_COMMAND_POSTFIX);

            className = sb.toString();

            actionCommand = (ActionCommand) InstanceFactory.newInstance(className);

            _actionCommandCache.put(actionCommandName, actionCommand);

            return actionCommand;
        } catch (Exception e) {
            if (_log.isWarnEnabled()) {
                _log.warn("Unable to instantiate ActionCommand " + className);
            }

            _actionCommandCache.put(actionCommandName, EMPTY);

            return EMPTY;
        }
    }

    public List<ActionCommand> getActionCommandChain(String actionCommandChain) {

        List<ActionCommand> actionCommands = _actionCommandChainCache.get(actionCommandChain);

        if (actionCommands != null) {
            return actionCommands;
        }

        actionCommands = new ArrayList<ActionCommand>();

        String[] actionCommandNames = StringUtil.split(actionCommandChain);

        for (String actionCommandName : actionCommandNames) {
            ActionCommand actionCommand = getActionCommand(actionCommandName);

            if (actionCommand != EMPTY) {
                actionCommands.add(actionCommand);
            } else {
                if (_log.isWarnEnabled()) {
                    _log.warn("Unable to find ActionCommand " + actionCommandChain);
                }
            }
        }

        _actionCommandChainCache.put(actionCommandChain, actionCommands);

        return actionCommands;
    }

    public boolean isEmpty() {
        return _actionCommandCache.isEmpty();
    }

    private static final String _ACTION_COMMAND_POSTFIX = "ActionCommand";

    private static Log _log = LogFactoryUtil.getLog(ActionCommandCache.class);

    private Map<String, ActionCommand> _actionCommandCache = new ConcurrentHashMap<String, ActionCommand>();
    private Map<String, List<ActionCommand>> _actionCommandChainCache = new ConcurrentHashMap<String, List<ActionCommand>>();
    private String _packagePrefix;

}