| /* |
| * 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.hadoop.structure.io; |
| |
| import org.apache.commons.configuration2.BaseConfiguration; |
| import org.apache.commons.configuration2.Configuration; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.mapreduce.InputFormat; |
| import org.apache.hadoop.mapreduce.OutputFormat; |
| import org.apache.tinkerpop.gremlin.hadoop.Constants; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.HadoopConfiguration; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.HadoopGraph; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.graphson.GraphSONInputFormat; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.graphson.GraphSONOutputFormat; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.gryo.GryoInputFormat; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.gryo.GryoOutputFormat; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.script.ScriptInputFormat; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.script.ScriptOutputFormat; |
| import org.apache.tinkerpop.gremlin.process.computer.GraphComputer; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class InputOutputHelper { |
| |
| private static Map<Class<? extends InputFormat<NullWritable, VertexWritable>>, Class<? extends OutputFormat<NullWritable, VertexWritable>>> INPUT_TO_OUTPUT_CACHE = new ConcurrentHashMap<>(); |
| private static Map<Class<? extends OutputFormat<NullWritable, VertexWritable>>, Class<? extends InputFormat<NullWritable, VertexWritable>>> OUTPUT_TO_INPUT_CACHE = new ConcurrentHashMap<>(); |
| |
| static { |
| INPUT_TO_OUTPUT_CACHE.put(GryoInputFormat.class, GryoOutputFormat.class); |
| INPUT_TO_OUTPUT_CACHE.put(GraphSONInputFormat.class, GraphSONOutputFormat.class); |
| INPUT_TO_OUTPUT_CACHE.put(ScriptInputFormat.class, ScriptOutputFormat.class); |
| // |
| OUTPUT_TO_INPUT_CACHE.put(GryoOutputFormat.class, GryoInputFormat.class); |
| OUTPUT_TO_INPUT_CACHE.put(GraphSONOutputFormat.class, GraphSONInputFormat.class); |
| OUTPUT_TO_INPUT_CACHE.put(ScriptOutputFormat.class, ScriptInputFormat.class); |
| } |
| |
| private InputOutputHelper() { |
| |
| } |
| |
| public static Class<? extends InputFormat> getInputFormat(final Class<? extends OutputFormat<NullWritable, VertexWritable>> outputFormat) { |
| return OUTPUT_TO_INPUT_CACHE.get(outputFormat); |
| } |
| |
| public static Class<? extends OutputFormat> getOutputFormat(final Class<? extends InputFormat<NullWritable, VertexWritable>> inputFormat) { |
| return INPUT_TO_OUTPUT_CACHE.get(inputFormat); |
| } |
| |
| public static void registerInputOutputPair(final Class<? extends InputFormat<NullWritable, VertexWritable>> inputFormat, final Class<? extends OutputFormat<NullWritable, VertexWritable>> outputFormat) { |
| INPUT_TO_OUTPUT_CACHE.put(inputFormat, outputFormat); |
| OUTPUT_TO_INPUT_CACHE.put(outputFormat, inputFormat); |
| } |
| |
| public static HadoopGraph getOutputGraph(final Configuration configuration, final GraphComputer.ResultGraph resultGraph, final GraphComputer.Persist persist) { |
| final HadoopConfiguration hadoopConfiguration = new HadoopConfiguration(configuration); |
| final BaseConfiguration newConfiguration = new BaseConfiguration(); |
| newConfiguration.copy(hadoopConfiguration); |
| if (resultGraph.equals(GraphComputer.ResultGraph.NEW)) { |
| newConfiguration.setProperty(Constants.GREMLIN_HADOOP_INPUT_LOCATION, hadoopConfiguration.getOutputLocation()); |
| if (hadoopConfiguration.containsKey(Constants.GREMLIN_HADOOP_GRAPH_WRITER)) |
| if (null != InputOutputHelper.getInputFormat(hadoopConfiguration.getGraphWriter())) |
| newConfiguration.setProperty(Constants.GREMLIN_HADOOP_GRAPH_READER, InputOutputHelper.getInputFormat(hadoopConfiguration.getGraphWriter()).getCanonicalName()); |
| newConfiguration.setProperty(Constants.GREMLIN_HADOOP_GRAPH_READER_HAS_EDGES, persist.equals(GraphComputer.Persist.EDGES)); |
| } |
| newConfiguration.setProperty(Constants.GREMLIN_HADOOP_OUTPUT_LOCATION, hadoopConfiguration.getOutputLocation() + "/_"); |
| return HadoopGraph.open(newConfiguration); |
| } |
| } |