| /* |
| 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.tags; |
| |
| import org.apache.log4j.Logger; |
| import org.apache.wiki.WikiContext; |
| import org.apache.wiki.WikiEngine; |
| |
| import javax.servlet.jsp.JspWriter; |
| import javax.servlet.jsp.PageContext; |
| import java.io.IOException; |
| |
| /** |
| * Writes difference between two pages using a HTML table. If there is |
| * no difference, includes the body. |
| * |
| * <P><B>Attributes</B></P> |
| * <UL> |
| * <LI>page - Page name to refer to. Default is the current page. |
| * </UL> |
| * |
| * @since 2.0 |
| */ |
| public class InsertDiffTag extends WikiTagBase { |
| |
| private static final long serialVersionUID = 0L; |
| private static final Logger log = Logger.getLogger( InsertDiffTag.class ); |
| |
| /** Attribute which is used to store the old page content to the Page Context */ |
| public static final String ATTR_OLDVERSION = "olddiff"; |
| |
| /** Attribute which is used to store the new page content to the Page Context */ |
| public static final String ATTR_NEWVERSION = "newdiff"; |
| |
| protected String m_pageName; |
| |
| /** {@inheritDoc} */ |
| public void initTag() { |
| super.initTag(); |
| m_pageName = null; |
| } |
| |
| /** |
| * Sets the page name. |
| * @param page Page to get diff from. |
| */ |
| public void setPage( final String page ) |
| { |
| m_pageName = page; |
| } |
| |
| /** |
| * Gets the page name. |
| * @return The page name. |
| */ |
| public String getPage() |
| { |
| return m_pageName; |
| } |
| |
| /** {@inheritDoc} */ |
| public final int doWikiStartTag() throws IOException { |
| final WikiEngine engine = m_wikiContext.getEngine(); |
| final WikiContext ctx; |
| |
| if( m_pageName == null ) { |
| ctx = m_wikiContext; |
| } else { |
| ctx = ( WikiContext )m_wikiContext.clone(); |
| ctx.setPage( engine.getPage(m_pageName) ); |
| } |
| |
| final Integer vernew = ( Integer )pageContext.getAttribute( ATTR_NEWVERSION, PageContext.REQUEST_SCOPE ); |
| final Integer verold = ( Integer )pageContext.getAttribute( ATTR_OLDVERSION, PageContext.REQUEST_SCOPE ); |
| |
| log.debug("Request diff between version "+verold+" and "+vernew); |
| |
| if( ctx.getPage() != null ) { |
| final JspWriter out = pageContext.getOut(); |
| final String diff = engine.getDifferenceManager().getDiff( ctx, vernew.intValue(), verold.intValue() ); |
| |
| if( diff.length() == 0 ) { |
| return EVAL_BODY_INCLUDE; |
| } |
| |
| out.write( diff ); |
| } |
| |
| return SKIP_BODY; |
| } |
| |
| } |
| |