| /* |
| 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.wiki.WikiContext; |
| import org.apache.wiki.WikiEngine; |
| import org.apache.wiki.WikiProvider; |
| import org.apache.wiki.api.exceptions.NoRequiredPropertyException; |
| import org.apache.wiki.api.exceptions.WikiException; |
| |
| /** |
| * Provides an SPI for creating a diff between two page versions. |
| */ |
| public interface DiffProvider extends WikiProvider |
| { |
| /** |
| * The return string is to be XHTML compliant ready to display html. No further |
| * processing of this text will be done by the wiki engine. |
| * |
| * @return An XHTML diff. |
| * @param context The Wiki Context |
| * @param oldWikiText the old text |
| * @param newWikiText the new text |
| */ |
| String makeDiffHtml(WikiContext context, String oldWikiText, String newWikiText); |
| |
| /** |
| * If there is no diff provider set, this provider will work instead. |
| */ |
| class NullDiffProvider implements DiffProvider |
| { |
| /** |
| * {@inheritDoc} |
| */ |
| public String makeDiffHtml(WikiContext ctx, String oldWikiText, String newWikiText) |
| { |
| return "You are using the NullDiffProvider, check your properties file."; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void initialize(WikiEngine engine, Properties properties) |
| throws NoRequiredPropertyException, WikiException |
| { |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public String getProviderInfo() |
| { |
| return "NullDiffProvider"; |
| } |
| } |
| |
| } |