/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/search/trunk/search-impl/impl/src/java/org/sakaiproject/search/component/adapter/contenthosting/PPTContentDigester.java $
* $Id: PPTContentDigester.java 105078 2012-02-24 23:00:38Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 The Sakai Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.search.component.adapter.contenthosting;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.poi.poifs.eventfilesystem.POIFSReader;
import org.apache.poi.poifs.eventfilesystem.POIFSReaderEvent;
import org.apache.poi.poifs.eventfilesystem.POIFSReaderListener;
import org.apache.poi.poifs.filesystem.DocumentInputStream;
import org.apache.poi.util.LittleEndian;
import org.sakaiproject.content.api.ContentResource;
import org.sakaiproject.search.api.SearchUtils;
/**
* @author ieb
*/
public class PPTContentDigester extends BaseContentDigester
{
private static Log log = LogFactory.getLog(PPTContentDigester.class);
static
{
System.setProperty("org.apache.poi.util.POILogger",
"org.apache.poi.util.NullLogger");
}
/*
* (non-Javadoc)
*
* @see org.sakaiproject.search.component.adapter.contenthosting.BaseContentDigester#getContent(org.sakaiproject.content.api.ContentResource)
*/
public String getContent(ContentResource contentResource)
{
if (contentResource == null) {
throw new RuntimeException("Null contentResource passed to getContent");
}
InputStream contentStream = null;
try
{
// this is informed by the text extractors in Jackrabbit
final ByteArrayOutputStream os = new ByteArrayOutputStream();
POIFSReaderListener listener = new POIFSReaderListener()
{
public void processPOIFSReaderEvent(POIFSReaderEvent event)
{
try
{
if (!event.getName().equalsIgnoreCase("PowerPoint Document"))
{
return;
}
DocumentInputStream input = event.getStream();
byte[] buffer = new byte[input.available()];
input.read(buffer, 0, input.available());
for (int i = 0; i < buffer.length - 20; i++)
{
long type = LittleEndian.getUShort(buffer, i + 2);
long size = LittleEndian.getUInt(buffer, i + 4);
if (type == 4008)
{
os.write(buffer, i + 4 + 1, (int) size + 3);
i = i + 4 + 1 + (int) size - 1;
}
}
}
catch (Exception e)
{
log.debug(e);
}
}
};
POIFSReader reader = new POIFSReader();
reader.registerListener(listener);
contentStream = contentResource.streamContent();
reader.read(contentStream);
os.flush();
StringBuilder sb = new StringBuilder();
SearchUtils.appendCleanString(new String(os.toByteArray(), "UTF-8"), sb);
return sb.toString();
}
catch (Exception e)
{
throw new RuntimeException("Failed to read content for indexing ", e);
}
finally
{
if (contentStream != null)
{
try
{
contentStream.close();
}
catch (IOException e)
{
log.debug(e);
}
}
}
}
/*
* (non-Javadoc)
*
* @see org.sakaiproject.search.component.adapter.contenthosting.BaseContentDigester#getContentReader(org.sakaiproject.content.api.ContentResource)
*/
public Reader getContentReader(ContentResource contentResource)
{
return new StringReader(getContent(contentResource));
}
}