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.portal.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.kernel.util.Validator;
021    
022    /**
023     * @author Brian Wing Shun Chan
024     */
025    public class LayoutCloneFactory {
026    
027            public static LayoutClone getInstance() {
028                    if (_layoutClone == null) {
029                            if (Validator.isNotNull(PropsValues.LAYOUT_CLONE_IMPL)) {
030                                    if (_log.isDebugEnabled()) {
031                                            _log.debug("Instantiate " + PropsValues.LAYOUT_CLONE_IMPL);
032                                    }
033    
034                                    ClassLoader classLoader =
035                                            PortalClassLoaderUtil.getClassLoader();
036    
037                                    try {
038                                            _layoutClone = (LayoutClone)classLoader.loadClass(
039                                                    PropsValues.LAYOUT_CLONE_IMPL).newInstance();
040                                    }
041                                    catch (Exception e) {
042                                            _log.error(e, e);
043                                    }
044                            }
045                    }
046                    else {
047                            if (_log.isDebugEnabled()) {
048                                    _log.debug("Return " + _layoutClone.getClass().getName());
049                            }
050                    }
051    
052                    return _layoutClone;
053            }
054    
055            private static Log _log = LogFactoryUtil.getLog(LayoutCloneFactory.class);
056    
057            private static LayoutClone _layoutClone;
058    
059    }