opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/impl/StructuredDataToJsonProvider.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.sal.rest.impl;
   9
  10 import java.io.IOException;
  11 import java.io.OutputStream;
  12 import java.io.OutputStreamWriter;
  13 import java.lang.annotation.Annotation;
  14 import java.lang.reflect.Type;
  15
  16 import javax.ws.rs.Produces;
  17 import javax.ws.rs.WebApplicationException;
  18 import javax.ws.rs.core.MediaType;
  19 import javax.ws.rs.core.MultivaluedMap;
  20 import javax.ws.rs.core.Response;
  21 import javax.ws.rs.ext.MessageBodyWriter;
  22 import javax.ws.rs.ext.Provider;
  23
  24 import org.opendaylight.controller.sal.rest.api.Draft02;
  25 import org.opendaylight.controller.sal.rest.api.RestconfService;
  26 import org.opendaylight.controller.sal.restconf.impl.ResponseException;
  27 import org.opendaylight.controller.sal.restconf.impl.StructuredData;
  28 import org.opendaylight.yangtools.yang.data.api.CompositeNode;
  29 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  30
  31 import com.google.gson.stream.JsonWriter;
  32
  33 @Provider
  34 @Produces({ Draft02.MediaTypes.API + RestconfService.JSON, Draft02.MediaTypes.DATA + RestconfService.JSON,
  35         Draft02.MediaTypes.OPERATION + RestconfService.JSON, MediaType.APPLICATION_JSON })
  36 public enum StructuredDataToJsonProvider implements MessageBodyWriter<StructuredData> {
  37     INSTANCE;
  38
  39     @Override
  40     public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
  41         return true;
  42     }
  43
  44     @Override
  45     public long getSize(StructuredData t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
  46         return -1;
  47     }
  48
  49     @Override
  50     public void writeTo(StructuredData t, Class<?> type, Type genericType, Annotation[] annotations,
  51             MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
  52             throws IOException, WebApplicationException {
  53         CompositeNode data = t.getData();
  54         if (data == null) {
  55             throw new ResponseException(Response.Status.NOT_FOUND, "No data exists.");
  56         }
  57
  58         JsonWriter writer = new JsonWriter(new OutputStreamWriter(entityStream, "UTF-8"));
  59         writer.setIndent("    ");
  60         JsonMapper jsonMapper = new JsonMapper();
  61         jsonMapper.write(writer, data, (DataNodeContainer) t.getSchema(), t.getMountPoint());
  62         writer.flush();
  63     }
  64
  65 }