| /* |
| * 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.process.computer.traversal; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.MessageCombiner; |
| import org.apache.tinkerpop.gremlin.process.traversal.traverser.util.TraverserSet; |
| |
| import java.util.Optional; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class TraversalVertexProgramMessageCombiner implements MessageCombiner<TraverserSet<Object>> { |
| |
| private static final Optional<TraversalVertexProgramMessageCombiner> INSTANCE = Optional.of(new TraversalVertexProgramMessageCombiner()); |
| |
| private TraversalVertexProgramMessageCombiner() { |
| |
| } |
| |
| public TraverserSet<Object> combine(final TraverserSet<Object> messageA, final TraverserSet<Object> messageB) { |
| messageA.addAll(messageB); |
| return messageA; |
| } |
| |
| public static Optional<TraversalVertexProgramMessageCombiner> instance() { |
| return INSTANCE; |
| } |
| } |