| /* |
| * 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); |
| } |
| } |
| } |