001    /**
002     * Copyright (c) 2000-2010 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.documentlibrary.util;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.util.PortalClassLoaderUtil;
020    import com.liferay.portal.util.PropsValues;
021    
022    /**
023     * @author Brian Wing Shun Chan
024     */
025    public class HookFactory {
026    
027            public static Hook getInstance() {
028                    if (_hook == null) {
029                            if (_log.isDebugEnabled()) {
030                                    _log.debug("Instantiate " + PropsValues.DL_HOOK_IMPL);
031                            }
032    
033                            ClassLoader classLoader = PortalClassLoaderUtil.getClassLoader();
034    
035                            try {
036                                    _hook = (Hook)classLoader.loadClass(
037                                            PropsValues.DL_HOOK_IMPL).newInstance();
038                            }
039                            catch (Exception e) {
040                                    _log.error(e, e);
041                            }
042                    }
043    
044                    if (_log.isDebugEnabled()) {
045                            _log.debug("Return " + _hook.getClass().getName());
046                    }
047    
048                    return _hook;
049            }
050    
051            public static void setInstance(Hook hook) {
052                    if (_log.isDebugEnabled()) {
053                            _log.debug("Set " + hook.getClass().getName());
054                    }
055    
056                    _hook = hook;
057            }
058    
059            private static Log _log = LogFactoryUtil.getLog(HookFactory.class);
060    
061            private static Hook _hook;
062    
063    }