/*
JSPWiki - a JSP-based WikiWiki clone.
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 com.ecyrd.jspwiki.tags;
import java.io.IOException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.WikiEngine;
/**
* 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;
/** 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( 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
{
WikiEngine engine = m_wikiContext.getEngine();
WikiContext ctx;
if( m_pageName == null )
{
ctx = m_wikiContext;
}
else
{
ctx = (WikiContext)m_wikiContext.clone();
ctx.setPage( engine.getPage(m_pageName) );
}
Integer vernew = (Integer) pageContext.getAttribute( ATTR_NEWVERSION,
PageContext.REQUEST_SCOPE );
Integer verold = (Integer) pageContext.getAttribute( ATTR_OLDVERSION,
PageContext.REQUEST_SCOPE );
log.info("Request diff between version "+verold+" and "+vernew);
if( ctx.getPage() != null )
{
JspWriter out = pageContext.getOut();
String diff = engine.getDiff( ctx,
vernew.intValue(),
verold.intValue() );
if( diff.length() == 0 )
{
return EVAL_BODY_INCLUDE;
}
out.write( diff );
}
return SKIP_BODY;
}
}