/*
* 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.oodt.cas.product.jaxrs.writers;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.Map.Entry;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.oodt.cas.product.jaxrs.configurations.RdfConfiguration;
import org.apache.oodt.cas.product.jaxrs.exceptions.InternalServerErrorException;
import org.apache.oodt.cas.product.jaxrs.resources.DatasetResource;
import org.apache.oodt.cas.product.jaxrs.resources.MetadataResource;
import org.apache.oodt.cas.product.jaxrs.resources.MetadataResource.MetadataEntry;
import org.apache.oodt.cas.product.jaxrs.resources.ProductResource;
import org.apache.oodt.commons.xml.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* A {@link Provider} that writes {@link DatasetResource dataset resources} to
* output streams for HTTP responses with "application/rdf+xml" content-type.
* @author rlaidlaw
* @version $Revision$
*/
@Provider
@Produces("application/rdf+xml")
public class DatasetRdfWriter extends RdfWriter
implements MessageBodyWriter<DatasetResource>
{
private static final Logger LOGGER = Logger.getLogger(DatasetRdfWriter.class
.getName());
@Override
public long getSize(DatasetResource resource, Class<?> type,
Type genericType, Annotation[] annotations, MediaType mediaType)
{
return -1;
}
@Override
public boolean isWriteable(Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType)
{
return true;
}
@Override
public void writeTo(DatasetResource resource, Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
throws IOException, WebApplicationException
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
RdfConfiguration configuration = getConfiguration();
try
{
Document doc = factory.newDocumentBuilder().newDocument();
Element rdf = XMLUtils.addNode(doc, doc, "rdf:RDF");
XMLUtils.addAttribute(doc, rdf, RDF_NAMESPACE_NAME, RDF_NAMESPACE_VALUE);
if (configuration != null)
{
Map<String, String> namespaceMap = configuration.getNamespaces();
for (Entry<String, String> entry : namespaceMap.entrySet())
{
XMLUtils.addAttribute(doc, rdf, "xmlns:" + entry.getKey(),
entry.getValue());
}
}
else
{
XMLUtils.addAttribute(doc, rdf, CAS_NAMESPACE_NAME,
CAS_NAMESPACE_VALUE);
}
for (ProductResource productResource : resource.getProductResources())
{
String productTypeName = productResource.getProductTypeName();
String productId = productResource.getProductId();
String productNs = configuration != null
? configuration.getTypeNamespace(productTypeName)
: CAS_NAMESPACE_PREFIX;
Element productRdf = XMLUtils.addNode(doc, rdf,
productNs + ":" + productTypeName);
XMLUtils.addAttribute(doc, productRdf, "rdf:about",
getBaseUri() + "product?productId=" + productId);
if (configuration != null)
{
MetadataResource metadataResource = productResource
.getMetadataResource();
for (MetadataEntry entry : metadataResource.getMetadataEntries())
{
for (String value : entry.getValues())
{
Element metaElement = configuration.createElement(entry.getKey(),
value, doc);
productRdf.appendChild(metaElement);
}
}
}
}
XMLUtils.writeXmlToStream(doc, entityStream);
}
catch (ParserConfigurationException e)
{
String message = "Unable to build org.w3c.dom.Document for output.";
LOGGER.log(Level.WARNING, message, e);
throw new InternalServerErrorException(message);
}
}
}