org.apache.tika.parser.rtf.RTFParser Maven / Gradle / Ivy
/*
* 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.tika.parser.rtf;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Set;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.StyleContext;
import javax.swing.text.rtf.RTFEditorKit;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
/**
* RTF parser
*/
public class RTFParser implements Parser {
private static final Set SUPPORTED_TYPES =
Collections.singleton(MediaType.application("rtf"));
public Set getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
try {
Document sd = new CustomStyledDocument();
new RTFEditorKit().read(stream, sd, 0);
XHTMLContentHandler xhtml =
new XHTMLContentHandler(handler, metadata);
xhtml.startDocument();
xhtml.element("p", sd.getText(0, sd.getLength()));
xhtml.endDocument();
} catch (BadLocationException e) {
throw new TikaException("Error parsing an RTF document", e);
}
}
/**
* @deprecated This method will be removed in Apache Tika 1.0.
*/
public void parse(
InputStream stream, ContentHandler handler, Metadata metadata)
throws IOException, SAXException, TikaException {
parse(stream, handler, metadata, new ParseContext());
}
/**
* Customized version of {@link DefaultStyledDocument}. Adds whitespace
* to places where words otherwise could have run together (see
* TIKA-392),
* and works around the problem of Swing expecting a GUI environment (see
* TIKA-282).
*/
private static class CustomStyledDocument extends DefaultStyledDocument {
public CustomStyledDocument() {
super(new NoReclaimStyleContext());
}
@Override
public void insertString(
int offs, String str, AttributeSet a)
throws BadLocationException {
if (offs > 0 && offs == getLength()) {
super.insertString(offs, " ", a);
super.insertString(getLength(), str, a);
} else {
super.insertString(offs, str, a);
}
}
}
/**
* A workaround to
* TIKA-282:
* RTF parser expects a GUI environment. This class simply disables the
* troublesome SwingUtilities.isEventDispatchThread() call that's made in
* the {@link StyleContext#reclaim(AttributeSet)} method.
*/
private static class NoReclaimStyleContext extends StyleContext {
/** Ignored. */
public void reclaim(AttributeSet a) {
}
}
}