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https://issues.apache.org/jira/browse/TIKA-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17526803#comment-17526803
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Dan Coldrick commented on TIKA-3721:
------------------------------------
Is this along the right lines?
{code:java}
/*
* 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.dgn;import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Set;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.input.CloseShieldInputStream;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.TikaInputStream;
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.parser.microsoft.SummaryExtractor;
import org.apache.tika.sax.XHTMLContentHandler;/**
* DGN (CAD Drawing) parser. This is a very basic parser, which just looks for
* bits of the headers.
*/
public class DGNParser extends AbstractParser { /**
*
*/
private static final long serialVersionUID = 311571157668507304L;
private static MediaType TYPE = MediaType.image("vnd.dgn");
public Set<MediaType> getSupportedTypes(ParseContext context) {
return Collections.singleton(TYPE);
}
public void parse(InputStream stream, ContentHandler handler, Metadata
metadata, ParseContext context)
throws IOException, SAXException, TikaException {
XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
xhtml.startDocument();
SummaryExtractor summaryExtractor = new SummaryExtractor(metadata);
final DirectoryNode root;
TikaInputStream tstream = TikaInputStream.cast(stream);
POIFSFileSystem mustCloseFs = null;
try {
if (tstream == null) {
mustCloseFs = new POIFSFileSystem(new
CloseShieldInputStream(stream));
root = mustCloseFs.getRoot();
} else {
final Object container = tstream.getOpenContainer();
if (container instanceof POIFSFileSystem) {
root = ((POIFSFileSystem) container).getRoot();
} else if (container instanceof DirectoryNode) {
root = (DirectoryNode) container;
} else {
POIFSFileSystem fs = null;
if (tstream.hasFile()) {
fs = new POIFSFileSystem(tstream.getFile(), true);
} else {
fs = new POIFSFileSystem(new
CloseShieldInputStream(tstream));
}
// tstream will close the fs, no need to close this below
tstream.setOpenContainer(fs);
root = fs.getRoot(); }
} summaryExtractor.parseSummaries(root); }
finally {
IOUtils.closeQuietly(mustCloseFs);
}
xhtml.endDocument();
}
}
{code}
I know I'm not handling v7's yet but it does appear to output v8's meta data at
least? If we have it in it's own parser there is the option to extend for V7's?
Again I'm not really a proper java developer and can just hack my way around to
get stuff working so any feedback would be good?
> DGN parser
> ----------
>
> Key: TIKA-3721
> URL: https://issues.apache.org/jira/browse/TIKA-3721
> Project: Tika
> Issue Type: New Feature
> Components: parser
> Affects Versions: 2.3.0
> Reporter: Dan Coldrick
> Priority: Minor
> Attachments: Screenshot from 2022-04-22 16-03-44.png,
> dgn8s-dumped.txt, image-2022-04-22-20-00-45-704.png,
> image-2022-04-22-20-01-09-564.png, image-2022-04-22-20-02-24-180.png
>
>
> Does anyone have any experience with the DGN file format by MicroStation? I
> see TIKA doesn't have a parser so would it be possible to create one?
> https://docs.fileformat.com/cad/dgn/
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