| /* |
| * 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.tinkerpop.gremlin.structure.util.star; |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.GraphFilter; |
| import org.apache.tinkerpop.gremlin.structure.Direction; |
| import org.apache.tinkerpop.gremlin.structure.Edge; |
| import org.apache.tinkerpop.gremlin.structure.T; |
| import org.apache.tinkerpop.gremlin.structure.VertexProperty; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.kryoshim.InputShim; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.kryoshim.KryoShim; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.kryoshim.OutputShim; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.kryoshim.SerializerShim; |
| |
| /** |
| * Kryo serializer for {@link StarGraph}. Implements an internal versioning capability for backward compatibility. |
| * The single byte at the front of the serialization stream denotes the version. That version can be used to choose |
| * the correct deserialization mechanism. The limitation is that this versioning won't help with backward |
| * compatibility for custom serializers from providers. Providers should be encouraged to write their serializers |
| * with backward compatibility in mind. |
| * |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public class StarGraphSerializer implements SerializerShim<StarGraph> { |
| |
| private final Direction edgeDirectionToSerialize; |
| private GraphFilter graphFilter; |
| |
| private final static byte VERSION_1 = Byte.MIN_VALUE; |
| |
| public StarGraphSerializer(final Direction edgeDirectionToSerialize, final GraphFilter graphFilter) { |
| this.edgeDirectionToSerialize = edgeDirectionToSerialize; |
| this.graphFilter = graphFilter; |
| } |
| |
| @Override |
| public <O extends OutputShim> void write(final KryoShim<?, O> kryo, final O output, final StarGraph starGraph) { |
| output.writeByte(VERSION_1); |
| kryo.writeObjectOrNull(output, starGraph.edgeProperties, HashMap.class); |
| kryo.writeObjectOrNull(output, starGraph.metaProperties, HashMap.class); |
| kryo.writeClassAndObject(output, starGraph.starVertex.id); |
| kryo.writeObject(output, starGraph.starVertex.label); |
| writeEdges(kryo, output, starGraph, Direction.IN); |
| writeEdges(kryo, output, starGraph, Direction.OUT); |
| kryo.writeObject(output, null != starGraph.starVertex.vertexProperties); |
| if (null != starGraph.starVertex.vertexProperties) { |
| kryo.writeObject(output, starGraph.starVertex.vertexProperties.size()); |
| for (final Map.Entry<String, List<VertexProperty>> vertexProperties : starGraph.starVertex.vertexProperties.entrySet()) { |
| kryo.writeObject(output, vertexProperties.getKey()); |
| kryo.writeObject(output, vertexProperties.getValue().size()); |
| for (final VertexProperty vertexProperty : vertexProperties.getValue()) { |
| kryo.writeClassAndObject(output, vertexProperty.id()); |
| kryo.writeClassAndObject(output, vertexProperty.value()); |
| } |
| } |
| } |
| } |
| |
| /** |
| * If the returned {@link StarGraph} is null, that means that the {@link GraphFilter} filtered the vertex. |
| */ |
| @Override |
| public <I extends InputShim> StarGraph read(final KryoShim<I, ?> kryo, final I input, final Class<StarGraph> clazz) { |
| final StarGraph starGraph = StarGraph.open(); |
| input.readByte(); // version field ignored for now - for future use with backward compatibility |
| starGraph.edgeProperties = kryo.readObjectOrNull(input, HashMap.class); |
| starGraph.metaProperties = kryo.readObjectOrNull(input, HashMap.class); |
| starGraph.addVertex(T.id, kryo.readClassAndObject(input), T.label, kryo.readObject(input, String.class)); |
| readEdges(kryo, input, starGraph, Direction.IN); |
| readEdges(kryo, input, starGraph, Direction.OUT); |
| if (kryo.readObject(input, Boolean.class)) { |
| final int numberOfUniqueKeys = kryo.readObject(input, Integer.class); |
| for (int i = 0; i < numberOfUniqueKeys; i++) { |
| final String vertexPropertyKey = kryo.readObject(input, String.class); |
| final int numberOfVertexPropertiesWithKey = kryo.readObject(input, Integer.class); |
| for (int j = 0; j < numberOfVertexPropertiesWithKey; j++) { |
| final Object id = kryo.readClassAndObject(input); |
| final Object value = kryo.readClassAndObject(input); |
| starGraph.starVertex.property(VertexProperty.Cardinality.list, vertexPropertyKey, value, T.id, id); |
| } |
| } |
| } |
| return this.graphFilter.hasFilter() ? starGraph.applyGraphFilter(this.graphFilter).orElse(null) : starGraph; |
| } |
| |
| private <O extends OutputShim> void writeEdges(final KryoShim<?, O> kryo, final O output, final StarGraph starGraph, final Direction direction) { |
| // only write edges if there are some AND if the user requested them to be serialized AND if they match |
| // the direction being serialized by the format |
| final Map<String, List<Edge>> starEdges = direction.equals(Direction.OUT) ? starGraph.starVertex.outEdges : starGraph.starVertex.inEdges; |
| final boolean writeEdges = null != starEdges && edgeDirectionToSerialize != null |
| && (edgeDirectionToSerialize == direction || edgeDirectionToSerialize == Direction.BOTH); |
| kryo.writeObject(output, writeEdges); |
| if (writeEdges) { |
| kryo.writeObject(output, starEdges.size()); |
| for (final Map.Entry<String, List<Edge>> edges : starEdges.entrySet()) { |
| kryo.writeObject(output, edges.getKey()); |
| kryo.writeObject(output, edges.getValue().size()); |
| for (final Edge edge : edges.getValue()) { |
| kryo.writeClassAndObject(output, edge.id()); |
| kryo.writeClassAndObject(output, direction.equals(Direction.OUT) ? edge.inVertex().id() : edge.outVertex().id()); |
| } |
| } |
| } |
| } |
| |
| private <I extends InputShim> void readEdges(final KryoShim<I, ?> kryo, final I input, final StarGraph starGraph, final Direction direction) { |
| if (kryo.readObject(input, Boolean.class)) { |
| final int numberOfUniqueLabels = kryo.readObject(input, Integer.class); |
| for (int i = 0; i < numberOfUniqueLabels; i++) { |
| final String edgeLabel = kryo.readObject(input, String.class); |
| final int numberOfEdgesWithLabel = kryo.readObject(input, Integer.class); |
| for (int j = 0; j < numberOfEdgesWithLabel; j++) { |
| final Object edgeId = kryo.readClassAndObject(input); |
| final Object adjacentVertexId = kryo.readClassAndObject(input); |
| if (this.graphFilter.checkEdgeLegality(direction, edgeLabel).positive()) { |
| if (direction.equals(Direction.OUT)) |
| starGraph.starVertex.addOutEdge(edgeLabel, starGraph.addVertex(T.id, adjacentVertexId), T.id, edgeId); |
| else |
| starGraph.starVertex.addInEdge(edgeLabel, starGraph.addVertex(T.id, adjacentVertexId), T.id, edgeId); |
| } else if (null != starGraph.edgeProperties) { |
| starGraph.edgeProperties.remove(edgeId); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| |