/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. 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.jackrabbit.core.query;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import javax.jcr.RepositoryException;
import org.apache.jackrabbit.core.query.lucene.FieldNames;
import org.apache.jackrabbit.core.state.PropertyState;
import org.apache.jackrabbit.core.value.BLOBFileValue;
import org.apache.jackrabbit.core.value.InternalValue;
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;
/**
* Extracts texts from MS PowerPoint document binary data. Taken from Jakarta Slide
* class <code>org.apache.slide.extractor.MSPowerPointExtractor</code>
*/
public class MsPowerPointTextFilter implements TextFilter {
/**
* Reader
*/
private class MsPowerPointListener implements POIFSReaderListener {
private OutputStream os;
MsPowerPointListener(OutputStream os) {
this.os = os;
}
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) {
}
}
}
/**
* @return <code>true</code> for <code>application/vnd.ms-powerpoint</code>,
* <code>false</code> otherwise.
*/
public boolean canFilter(String mimeType) {
return "application/vnd.ms-powerpoint".equalsIgnoreCase(mimeType)
|| "application/mspowerpoint".equalsIgnoreCase(mimeType);
}
/**
* Returns a map with a single entry for field {@link FieldNames#FULLTEXT}.
*
* @param data
* object containing MS PowerPoint document data.
* @param encoding
* text encoding is not used, since it is specified in the data.
* @return a map with a single Reader value for field
* {@link FieldNames#FULLTEXT}.
* @throws RepositoryException
* if data is a multi-value property or it does not contain
* valid MS PowerPoint document.
*/
public Map doFilter(PropertyState data, String encoding)
throws RepositoryException {
InternalValue[] values = data.getValues();
if (values.length == 1) {
final BLOBFileValue blob = (BLOBFileValue) values[0].internalValue();
LazyReader reader = new LazyReader() {
protected void initializeReader() throws IOException {
InputStream in;
try {
in = blob.getStream();
} catch (RepositoryException e) {
throw new IOException(e.getMessage());
}
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
MsPowerPointListener listener = new MsPowerPointListener(baos);
POIFSReader reader = new POIFSReader();
reader.registerListener(listener);
reader.read(in);
delegate = new InputStreamReader(
new ByteArrayInputStream(baos.toByteArray()));
} finally {
in.close();
}
}
};
Map result = new HashMap();
result.put(FieldNames.FULLTEXT, reader);
return result;
} else {
// multi value not supported
throw new RepositoryException(
"Multi-valued binary properties not supported.");
}
}
}