/**
* 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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.microsoft;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.Set;
import org.apache.poi.hwmf.record.HwmfFont;
import org.apache.poi.hwmf.record.HwmfRecord;
import org.apache.poi.hwmf.record.HwmfRecordType;
import org.apache.poi.hwmf.record.HwmfText;
import org.apache.poi.hwmf.usermodel.HwmfPicture;
import org.apache.poi.util.LocaleUtil;
import org.apache.poi.util.RecordFormatException;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
/**
* This parser offers a very rough capability to extract text if there
* is text stored in the WMF files.
*/
public class WMFParser extends AbstractParser {
private static final MediaType MEDIA_TYPE = MediaType.image("wmf");
private static final Set<MediaType> SUPPORTED_TYPES =
Collections.singleton(MEDIA_TYPE);
@Override
public Set<MediaType> getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
@Override
public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
xhtml.startDocument();
try {
HwmfPicture picture = new HwmfPicture(stream);
//TODO: make x/y info public in POI so that we can use it here
//to determine when to keep two text parts on the same line
for (HwmfRecord record : picture.getRecords()) {
Charset charset = LocaleUtil.CHARSET_1252;
//this is pure hackery for specifying the font
//TODO: do what Graphics does by maintaining the stack, etc.!
//This fix should be done within POI
if (record.getRecordType().equals(HwmfRecordType.createFontIndirect)) {
HwmfFont font = ((HwmfText.WmfCreateFontIndirect) record).getFont();
charset = (font.getCharSet() == null || font.getCharSet().getCharset() == null)
? LocaleUtil.CHARSET_1252 :
font.getCharSet().getCharset();
}
if (record.getRecordType().equals(HwmfRecordType.extTextOut)) {
HwmfText.WmfExtTextOut textOut = (HwmfText.WmfExtTextOut) record;
xhtml.startElement("p");
xhtml.characters(textOut.getText(charset));
xhtml.endElement("p");
} else if (record.getRecordType().equals(HwmfRecordType.textOut)) {
HwmfText.WmfTextOut textOut = (HwmfText.WmfTextOut) record;
xhtml.startElement("p");
xhtml.characters(textOut.getText(charset));
xhtml.endElement("p");
}
}
} catch (RecordFormatException e) { //POI's hwmfparser can throw these for "parse exceptions"
throw new TikaException(e.getMessage(), e);
} catch (RuntimeException e) { //convert Runtime to RecordFormatExceptions
throw new TikaException(e.getMessage(), e);
} catch (AssertionError e) { //POI's hwmfparser can throw these for parse exceptions
throw new TikaException(e.getMessage(), e);
}
xhtml.endDocument();
}
}