| /******************************************************************************* |
| * 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.olingo.odata2.core.ep.consumer; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.UnsupportedEncodingException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.olingo.odata2.api.edm.Edm; |
| import org.apache.olingo.odata2.api.edm.EdmEntitySetInfo; |
| import org.apache.olingo.odata2.api.edm.EdmException; |
| import org.apache.olingo.odata2.api.edm.provider.EntityContainerInfo; |
| import org.apache.olingo.odata2.api.edm.provider.EntitySet; |
| import org.apache.olingo.odata2.api.ep.EntityProviderException; |
| import org.apache.olingo.odata2.core.commons.Decoder; |
| import org.apache.olingo.odata2.core.edm.provider.EdmEntitySetInfoImplProv; |
| import org.apache.olingo.odata2.core.ep.util.FormatJson; |
| import org.apache.olingo.odata2.core.servicedocument.ServiceDocumentImpl; |
| |
| import com.google.gson.stream.JsonReader; |
| |
| /** |
| * Reads the OData service document (JSON). |
| * |
| */ |
| public class JsonServiceDocumentConsumer { |
| private static final String DEFAULT_CHARSET = "UTF-8"; |
| List<EdmEntitySetInfo> entitySets = new ArrayList<EdmEntitySetInfo>(); |
| private String currentHandledObjectName; |
| |
| public ServiceDocumentImpl parseJson(final InputStream in) throws EntityProviderException { |
| return readServiceDocument(createJsonReader(in)); |
| } |
| |
| private ServiceDocumentImpl readServiceDocument(final JsonReader reader) throws EntityProviderException { |
| try { |
| reader.beginObject(); |
| currentHandledObjectName = reader.nextName(); |
| if (FormatJson.D.equals(currentHandledObjectName)) { |
| reader.beginObject(); |
| readContent(reader); |
| reader.endObject(); |
| } |
| reader.endObject(); |
| reader.peek(); |
| reader.close(); |
| } catch (final IOException e) { |
| throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass() |
| .getSimpleName()), e); |
| } catch (final IllegalStateException e) { |
| throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass() |
| .getSimpleName()), e); |
| } catch (final EdmException e) { |
| throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass() |
| .getSimpleName()), e); |
| } |
| return new ServiceDocumentImpl().setEntitySetsInfo(entitySets); |
| } |
| |
| private void readContent(final JsonReader reader) throws IOException, EdmException, EntityProviderException { |
| currentHandledObjectName = reader.nextName(); |
| if (FormatJson.ENTITY_SETS.equals(currentHandledObjectName)) { |
| reader.beginArray(); |
| readEntitySets(reader); |
| reader.endArray(); |
| } |
| } |
| |
| private void readEntitySets(final JsonReader reader) throws IOException, EntityProviderException, EdmException { |
| while (reader.hasNext()) { |
| currentHandledObjectName = reader.nextString(); |
| if (currentHandledObjectName != null) { |
| // Looking for the last dot: "\\.(?=[^.]+$)" |
| String[] names = currentHandledObjectName.split("\\" + Edm.DELIMITER + "(?=[^" + Edm.DELIMITER + "]+$)"); |
| if (names.length == 1) { |
| EntitySet entitySet = new EntitySet().setName(Decoder.decode(names[0])); |
| EntityContainerInfo container = new EntityContainerInfo().setDefaultEntityContainer(true); |
| EdmEntitySetInfo entitySetInfo = new EdmEntitySetInfoImplProv(entitySet, container); |
| entitySets.add(entitySetInfo); |
| } else { |
| EntitySet entitySet = new EntitySet().setName(Decoder.decode(names[1])); |
| EntityContainerInfo container = |
| new EntityContainerInfo().setName(Decoder.decode(names[0])).setDefaultEntityContainer(false); |
| EdmEntitySetInfo entitySetInfo = new EdmEntitySetInfoImplProv(entitySet, container); |
| entitySets.add(entitySetInfo); |
| } |
| } |
| } |
| } |
| |
| private JsonReader createJsonReader(final InputStream in) throws EntityProviderException { |
| if (in == null) { |
| throw new EntityProviderException(EntityProviderException.INVALID_STATE |
| .addContent(("Got not supported NULL object as content to de-serialize."))); |
| } |
| InputStreamReader isReader; |
| try { |
| isReader = new InputStreamReader(in, DEFAULT_CHARSET); |
| } catch (final UnsupportedEncodingException e) { |
| throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass() |
| .getSimpleName()), e); |
| } |
| return new JsonReader(isReader); |
| } |
| } |