/*
* 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;
import java.util.List;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.IOUtils;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.Property;
import org.apache.tika.metadata.TikaCoreProperties;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
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;
import ucar.nc2.Attribute;
import ucar.nc2.NetcdfFile;
import ucar.nc2.Variable;
import ucar.nc2.Dimension;
/**
* A {@link Parser} for <a
* href="http://www.unidata.ucar.edu/software/netcdf/index.html">NetCDF</a>
* files using the UCAR, MIT-licensed <a
* href="http://www.unidata.ucar.edu/software/netcdf-java/">NetCDF for Java</a>
* API.
*/
public class NetCDFParser extends AbstractParser {
/** Serial version UID */
private static final long serialVersionUID = -5940938274907708665L;
private final Set<MediaType> SUPPORTED_TYPES =
Collections.singleton(MediaType.application("x-netcdf"));
/*
* (non-Javadoc)
*
* @see
* org.apache.tika.parser.Parser#getSupportedTypes(org.apache.tika.parser
* .ParseContext)
*/
public Set<MediaType> 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();
IOUtils.copy(stream, os);
String name = metadata.get(Metadata.RESOURCE_NAME_KEY);
if (name == null) {
name = "";
}
try {
NetcdfFile ncFile = NetcdfFile.openInMemory(name, os.toByteArray());
// first parse out the set of global attributes
for (Attribute attr : ncFile.getGlobalAttributes()) {
Property property = resolveMetadataKey(attr.getName());
if (attr.getDataType().isString()) {
metadata.add(property, attr.getStringValue());
} else if (attr.getDataType().isNumeric()) {
int value = attr.getNumericValue().intValue();
metadata.add(property, String.valueOf(value));
}
}
XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
xhtml.startDocument();
xhtml.characters("dimensions:");
xhtml.newline();
for (Dimension dim : ncFile.getDimensions()){
xhtml.characters(dim.getName());
xhtml.characters(" = ");
xhtml.characters(String.valueOf(dim.getLength()));
xhtml.characters(";");
xhtml.newline();
}
xhtml.newline();
xhtml.characters("variables:");
for (Variable var : ncFile.getVariables()){
xhtml.newline();
xhtml.characters(String.valueOf(var.getDataType())); // data type
xhtml.characters(" ");
xhtml.characters(var.getNameAndDimensions()); //variable name and dimensions
xhtml.characters(";");
xhtml.newline();
for(Attribute element : var.getAttributes()){
String text = element.toString();
xhtml.characters(" :");
xhtml.characters(text);
xhtml.characters(";");
xhtml.newline();
}
}
xhtml.endDocument();
} catch (IOException e) {
throw new TikaException("NetCDF parse error", e);
}
}
private Property resolveMetadataKey(String localName) {
if ("title".equals(localName)) {
return TikaCoreProperties.TITLE;
}
return Property.internalText(localName);
}
}