/*
* 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.IOException;
import java.io.StringReader;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import javax.jcr.RepositoryException;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.rtf.RTFEditorKit;
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;
/**
* Extracts texts from RTF documents.
*/
public class RTFTextFilter implements TextFilter {
private RTFEditorKit rek = new RTFEditorKit();
private DefaultStyledDocument doc = new DefaultStyledDocument();
/**
* @return <code>true</code> for <code>application/rtf</code>,
* <code>false</code> otherwise.
*/
public boolean canFilter(String mimeType) {
return "application/rtf".equalsIgnoreCase(mimeType);
}
/**
* Returns a map with a single entry for field {@link FieldNames#FULLTEXT}.
*
* @param data object containing RTF 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 if the
* content can't be extracted
*/
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 {
InputStream in;
try {
in = blob.getStream();
} catch (RepositoryException e) {
throw new IOException(e.getMessage());
}
try {
doc.remove(0, doc.getLength());
rek.read(in, doc, 0);
String text = doc.getText(0, doc.getLength());
delegate = new StringReader(text);
} catch (BadLocationException e) {
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.");
}
}
}