| /* |
| * 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.spark.process.computer.payload; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.MessageCombiner; |
| import org.apache.tinkerpop.gremlin.structure.util.detached.DetachedVertexProperty; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class ViewIncomingPayload<M> implements Payload { |
| |
| private List<DetachedVertexProperty<Object>> view = null; |
| private List<M> incomingMessages; |
| |
| |
| private ViewIncomingPayload() { |
| |
| } |
| |
| public ViewIncomingPayload(final MessageCombiner<M> messageCombiner) { |
| this.incomingMessages = null == messageCombiner ? new ArrayList<>() : new ArrayList<>(1); |
| } |
| |
| public ViewIncomingPayload(final ViewPayload viewPayload) { |
| this.incomingMessages = null; |
| this.view = viewPayload.getView(); |
| } |
| |
| |
| public List<DetachedVertexProperty<Object>> getView() { |
| return null == this.view ? Collections.emptyList() : this.view; |
| } |
| |
| |
| public List<M> getIncomingMessages() { |
| return null == this.incomingMessages ? Collections.emptyList() : this.incomingMessages; |
| } |
| |
| public boolean hasView() { |
| return null != view; |
| } |
| |
| //////////////////// |
| |
| |
| private void mergeMessage(final M message, final MessageCombiner<M> messageCombiner) { |
| if (this.incomingMessages.isEmpty() || null == messageCombiner) |
| this.incomingMessages.add(message); |
| else |
| this.incomingMessages.set(0, messageCombiner.combine(this.incomingMessages.get(0), message)); |
| } |
| |
| private void mergeViewIncomingPayload(final ViewIncomingPayload<M> viewIncomingPayload, final MessageCombiner<M> messageCombiner) { |
| if (this.view == null) |
| this.view = viewIncomingPayload.view; |
| else |
| this.view.addAll(viewIncomingPayload.getView()); |
| |
| for (final M message : viewIncomingPayload.getIncomingMessages()) { |
| this.mergeMessage(message, messageCombiner); |
| } |
| } |
| |
| public void mergePayload(final Payload payload, final MessageCombiner<M> messageCombiner) { |
| if (null == payload) |
| return; |
| if (payload instanceof ViewPayload) |
| this.view = ((ViewPayload) payload).getView(); |
| else if (payload instanceof MessagePayload) |
| this.mergeMessage(((MessagePayload<M>) payload).getMessage(), messageCombiner); |
| else if (payload instanceof ViewIncomingPayload) |
| this.mergeViewIncomingPayload((ViewIncomingPayload<M>) payload, messageCombiner); |
| else |
| throw new IllegalArgumentException("The provided payload is an unsupported merge payload: " + payload); |
| } |
| } |