org.apache.tika.parser.netcdf.NetCDFParser 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.netcdf;
//JDK imports
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Set;
//TIKA imports
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.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
//NETCDF imports
import ucar.nc2.Attribute;
import ucar.nc2.NetcdfFile;
/**
* A {@link Parser} for NetCDF
* files using the UCAR, MIT-licensed NetCDF for Java
* API.
*/
public class NetCDFParser implements Parser {
private final Set SUPPORTED_TYPES = Collections
.singleton(MediaType.application("x-netcdf"));
/*
* (non-Javadoc)
*
* @see
* org.apache.tika.parser.Parser#getSupportedTypes(org.apache.tika.parser
* .ParseContext)
*/
public Set getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
/*
* (non-Javadoc)
*
* @see org.apache.tika.parser.Parser#parse(java.io.InputStream,
* org.xml.sax.ContentHandler, org.apache.tika.metadata.Metadata,
* org.apache.tika.parser.ParseContext)
*/
public void parse(InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context) throws IOException,
SAXException, TikaException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
this.writeStreamToMemory(stream, os);
NetcdfFile ncFile = NetcdfFile.openInMemory("", os.toByteArray());
// first parse out the set of global attributes
for (Attribute attr : ncFile.getGlobalAttributes()) {
String attrName = attr.getName();
if (attr.getDataType().isString()) {
metadata.add(attrName, attr.getStringValue());
} else if (attr.getDataType().isNumeric()) {
metadata.add(attrName, String.valueOf(attr.getNumericValue()
.intValue()));
}
}
}
/*
* (non-Javadoc)
*
* @see org.apache.tika.parser.Parser#parse(java.io.InputStream,
* org.xml.sax.ContentHandler, org.apache.tika.metadata.Metadata)
*/
public void parse(InputStream stream, ContentHandler handler,
Metadata metadata) throws IOException, SAXException, TikaException {
this.parse(stream, handler, metadata, new ParseContext());
}
protected void writeStreamToMemory(InputStream is, ByteArrayOutputStream os)
throws TikaException {
byte[] buf = new byte[512];
try {
while ((is.read(buf, 0, 512)) != -1) {
os.write(buf);
}
} catch (Exception e) {
e.printStackTrace();
throw new TikaException(e.getMessage());
}
}
}