| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| */ |
| |
| package org.apache.wiki.diff; |
| |
| import java.util.Properties; |
| |
| import org.apache.log4j.Logger; |
| import org.apache.wiki.WikiContext; |
| import org.apache.wiki.WikiEngine; |
| import org.apache.wiki.WikiInternalModule; |
| import org.apache.wiki.api.exceptions.WikiException; |
| import org.apache.wiki.util.ClassUtil; |
| import org.apache.wiki.util.TextUtil; |
| |
| |
| /** |
| * Load, initialize and delegate to the DiffProvider that will actually do the work. |
| */ |
| public class DifferenceManager extends WikiInternalModule { |
| private static final Logger log = Logger.getLogger(DifferenceManager.class); |
| |
| /** |
| * Property value for storing a diff provider. Value is {@value}. |
| */ |
| public static final String PROP_DIFF_PROVIDER = "jspwiki.diffProvider"; |
| |
| private DiffProvider m_provider; |
| |
| /** |
| * Creates a new DifferenceManager for the given engine. |
| * |
| * @param engine The WikiEngine. |
| * @param props A set of properties. |
| */ |
| public void initialize(WikiEngine engine, Properties props) throws WikiException { |
| |
| super.initialize(engine, props); |
| |
| |
| String providerClassName = TextUtil.getStringProperty( props, PROP_DIFF_PROVIDER, TraditionalDiffProvider.class.getName()); |
| m_provider = ClassUtil.getWikiProvider(DiffProvider.class, engine, props, "org.apache.wiki.diff", providerClassName, new DiffProvider.NullDiffProvider(), false); |
| |
| // loadProvider(props); |
| // |
| // initializeProvider(engine, props); |
| |
| log.info("Using difference provider: " + m_provider.getProviderInfo()); |
| } |
| |
| /* |
| private void loadProvider(Properties props) { |
| String providerClassName = props.getProperty(PROP_DIFF_PROVIDER, |
| TraditionalDiffProvider.class.getName()); |
| |
| try { |
| Class<?> providerClass = ClassUtil.findClass("org.apache.wiki.diff", providerClassName); |
| m_provider = (DiffProvider) providerClass.newInstance(); |
| } catch (ClassNotFoundException e) { |
| log.warn("Failed loading DiffProvider, will use NullDiffProvider.", e); |
| } catch (InstantiationException e) { |
| log.warn("Failed loading DiffProvider, will use NullDiffProvider.", e); |
| } catch (IllegalAccessException e) { |
| log.warn("Failed loading DiffProvider, will use NullDiffProvider.", e); |
| } |
| |
| if (null == m_provider) { |
| m_provider = new DiffProvider.NullDiffProvider(); |
| } |
| } |
| |
| |
| private void initializeProvider(WikiEngine engine, Properties props) { |
| try { |
| m_provider.initialize(engine, props); |
| } catch (NoRequiredPropertyException e1) { |
| log.warn("Failed initializing DiffProvider, will use NullDiffProvider.", e1); |
| m_provider = new DiffProvider.NullDiffProvider(); //doesn't need init'd |
| } catch (IOException e1) { |
| log.warn("Failed initializing DiffProvider, will use NullDiffProvider.", e1); |
| m_provider = new DiffProvider.NullDiffProvider(); //doesn't need init'd |
| } |
| } |
| */ |
| |
| /** |
| * Returns valid XHTML string to be used in any way you please. |
| * |
| * @param context The Wiki Context |
| * @param firstWikiText The old text |
| * @param secondWikiText the new text |
| * @return XHTML, or empty string, if no difference detected. |
| */ |
| public String makeDiff(WikiContext context, String firstWikiText, String secondWikiText) { |
| String diff = null; |
| try { |
| diff = m_provider.makeDiffHtml(context, firstWikiText, secondWikiText); |
| |
| if (diff == null) { |
| diff = ""; |
| } |
| } catch (Exception e) { |
| diff = "Failed to create a diff, check the logs."; |
| log.warn(diff, e); |
| } |
| return diff; |
| } |
| } |
| |