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 com.google.common.base.Charsets;
  11 import com.google.gson.stream.JsonWriter;
  12 import java.io.IOException;
  13 import java.io.OutputStream;
  14 import java.io.OutputStreamWriter;
  15 import java.lang.annotation.Annotation;
  16 import java.lang.reflect.Type;
  17 import javax.ws.rs.Produces;
  18 import javax.ws.rs.WebApplicationException;
  19 import javax.ws.rs.core.MediaType;
  20 import javax.ws.rs.core.MultivaluedMap;
  21 import javax.ws.rs.core.Response;
  22 import javax.ws.rs.ext.MessageBodyWriter;
  23 import javax.ws.rs.ext.Provider;
  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.RestconfDocumentedException;
  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 @Provider
  32 @Produces({ Draft02.MediaTypes.API + RestconfService.JSON, Draft02.MediaTypes.DATA + RestconfService.JSON,
  33     Draft02.MediaTypes.OPERATION + RestconfService.JSON, MediaType.APPLICATION_JSON })
  34 public enum StructuredDataToJsonProvider implements MessageBodyWriter<StructuredData> {
  35     INSTANCE;
  36
  37     @Override
  38     public boolean isWriteable(final Class<?> type, final Type genericType, final Annotation[] annotations, final MediaType mediaType) {
  39         return type.equals(StructuredData.class);
  40     }
  41
  42     @Override
  43     public long getSize(final StructuredData t, final Class<?> type, final Type genericType, final Annotation[] annotations, final MediaType mediaType) {
  44         return -1;
  45     }
  46
  47     @Override
  48     public void writeTo(final StructuredData t, final Class<?> type, final Type genericType, final Annotation[] annotations,
  49             final MediaType mediaType, final MultivaluedMap<String, Object> httpHeaders, final OutputStream entityStream)
  50                     throws IOException, WebApplicationException {
  51         CompositeNode data = t.getData();
  52         if (data == null) {
  53             throw new RestconfDocumentedException(Response.Status.NOT_FOUND);
  54         }
  55
  56         JsonWriter writer = new JsonWriter(new OutputStreamWriter(entityStream, Charsets.UTF_8));
  57
  58         if (t.isPrettyPrintMode()) {
  59             writer.setIndent("    ");
  60         } else {
  61             writer.setIndent("");
  62         }
  63         JsonMapper jsonMapper = new JsonMapper(t.getMountPoint());
  64         jsonMapper.write(writer, data, (DataNodeContainer) t.getSchema());
  65         writer.flush();
  66     }
  67 }