opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/impl/JsonNormalizedNodeBodyReader.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.collect.Iterables;
  11 import com.google.gson.stream.JsonReader;
  12 import java.io.IOException;
  13 import java.io.InputStream;
  14 import java.io.InputStreamReader;
  15 import java.lang.annotation.Annotation;
  16 import java.lang.reflect.Type;
  17 import javax.ws.rs.Consumes;
  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.ext.MessageBodyReader;
  22 import javax.ws.rs.ext.Provider;
  23 import org.opendaylight.controller.sal.rest.api.Draft02;
  24 import org.opendaylight.controller.sal.rest.api.RestconfService;
  25 import org.opendaylight.controller.sal.restconf.impl.InstanceIdentifierContext;
  26 import org.opendaylight.controller.sal.restconf.impl.NormalizedNodeContext;
  27 import org.opendaylight.controller.sal.restconf.impl.RestconfDocumentedException;
  28 import org.opendaylight.controller.sal.restconf.impl.RestconfError.ErrorTag;
  29 import org.opendaylight.controller.sal.restconf.impl.RestconfError.ErrorType;
  30 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
  31 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  32 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  33 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  34 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  35 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  38 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  39 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
  40 import org.slf4j.Logger;
  41 import org.slf4j.LoggerFactory;
  42
  43 @Provider
  44 @Consumes({ Draft02.MediaTypes.DATA + RestconfService.JSON, Draft02.MediaTypes.OPERATION + RestconfService.JSON,
  45         MediaType.APPLICATION_JSON })
  46 public class JsonNormalizedNodeBodyReader extends AbstractIdentifierAwareJaxRsProvider implements MessageBodyReader<NormalizedNodeContext> {
  47
  48     private final static Logger LOG = LoggerFactory.getLogger(JsonNormalizedNodeBodyReader.class);
  49
  50     @Override
  51     public boolean isReadable(final Class<?> type, final Type genericType, final Annotation[] annotations,
  52             final MediaType mediaType) {
  53         return true;
  54     }
  55
  56     @Override
  57     public NormalizedNodeContext readFrom(final Class<NormalizedNodeContext> type, final Type genericType,
  58             final Annotation[] annotations, final MediaType mediaType,
  59             final MultivaluedMap<String, String> httpHeaders, final InputStream entityStream) throws IOException,
  60             WebApplicationException {
  61         try {
  62             final InstanceIdentifierContext<?> path = getIdentifierWithSchema().get();
  63             if (entityStream.available() < 1) {
  64                 return new NormalizedNodeContext(path, null);
  65             }
  66             final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
  67             final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
  68
  69             final SchemaNode parentSchema;
  70             if(isPost()) {
  71                 // FIXME: We need dispatch for RPC.
  72                 parentSchema = path.getSchemaNode();
  73             } else if(path.getSchemaNode() instanceof SchemaContext) {
  74                 parentSchema = path.getSchemaContext();
  75             } else {
  76                 if (SchemaPath.ROOT.equals(path.getSchemaNode().getPath().getParent())) {
  77                     parentSchema = path.getSchemaContext();
  78                 } else {
  79                     parentSchema = SchemaContextUtil.findDataSchemaNode(path.getSchemaContext(), path.getSchemaNode().getPath().getParent());
  80                 }
  81             }
  82
  83             final JsonParserStream jsonParser = JsonParserStream.create(writer, path.getSchemaContext(), parentSchema);
  84             final JsonReader reader = new JsonReader(new InputStreamReader(entityStream));
  85             jsonParser.parse(reader);
  86
  87             final NormalizedNode<?, ?> partialResult = resultHolder.getResult();
  88             final NormalizedNode<?, ?> result;
  89             if(partialResult instanceof MapNode) {
  90                 result = Iterables.getOnlyElement(((MapNode) partialResult).getValue());
  91             } else {
  92                 result = partialResult;
  93             }
  94             return new NormalizedNodeContext(path,result);
  95         } catch (final Exception e) {
  96             LOG.debug("Error parsing json input", e);
  97
  98             throw new RestconfDocumentedException("Error parsing input: " + e.getMessage(), ErrorType.PROTOCOL,
  99                     ErrorTag.MALFORMED_MESSAGE);
 100         }
 101     }
 102 }
 103