/*
* 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.jackrabbit.core.query;
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.BufferedInputStream;
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.pdfbox.pdfparser.PDFParser;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.util.PDFTextStripper;
/**
* Extracts texts from Adobe PDF document binary data.
* Taken from Jakarta Slide class
* <code>org.apache.slide.extractor.PDFExtractor</code>
*/
public class PdfTextFilter implements TextFilter {
/**
* Force loading of dependent class.
*/
static {
PDFParser.class.getName();
}
/**
* @return <code>true</code> for <code>application/pdf</code>, <code>false</code> otherwise.
*/
public boolean canFilter(String mimeType) {
return "application/pdf".equalsIgnoreCase(mimeType);
}
/**
* Returns a map with a single entry for field {@link FieldNames#FULLTEXT}.
* @param data object containing Adobe PDF 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 PDF document.
*/
public Map doFilter(PropertyState data, String encoding) throws RepositoryException {
InternalValue[] values = data.getValues();
if (values.length > 0) {
final BLOBFileValue blob = (BLOBFileValue) values[0].internalValue();
LazyReader reader = new LazyReader() {
protected void initializeReader() throws IOException {
PDFParser parser;
InputStream in;
try {
in = blob.getStream();
} catch (RepositoryException e) {
throw new IOException(e.getMessage());
}
try {
parser = new PDFParser(new BufferedInputStream(in));
parser.parse();
PDDocument document = parser.getPDDocument();
try {
CharArrayWriter writer = new CharArrayWriter();
PDFTextStripper stripper = new PDFTextStripper();
stripper.setLineSeparator("\n");
stripper.writeText(document, writer);
delegate = new CharArrayReader(writer.toCharArray());
} finally {
document.close();
}
} catch (Exception e) {
// it may happen that PDFParser throws a runtime
// exception when parsing certain pdf documents
throw new IOException(e.getMessage());
} 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.");
}
}
}