| /* |
| * 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.giraph.io.formats.multi; |
| |
| import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration; |
| import org.apache.giraph.conf.StrConfOption; |
| import org.apache.giraph.io.MappingInputFormat; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.json.JSONArray; |
| import org.json.JSONException; |
| |
| import com.google.common.collect.Lists; |
| |
| import java.util.List; |
| |
| /** |
| * Description of the mapping input format - holds mapping input format class |
| * and all parameters specifically set for that mapping input format. |
| * |
| * Used only with {@link MultiMappingInputFormat} |
| * |
| * @param <I> Vertex id |
| * @param <V> Vertex data |
| * @param <E> Edge data |
| * @param <B> Mapping target |
| */ |
| public class MappingInputFormatDescription<I extends WritableComparable, |
| V extends Writable, E extends Writable, B extends Writable> |
| extends InputFormatDescription<MappingInputFormat<I, V, E, B>> { |
| /** |
| * MappingInputFormats description - JSON array containing a JSON array for |
| * each mapping input. Mapping input JSON arrays contain one or two elements - |
| * first one is the name of mapping input class, and second one is JSON object |
| * with all specific parameters for this mapping input. For example: |
| * [["VIF1",{"p":"v1"}],["VIF2",{"p":"v2","q":"v"}]] |
| */ |
| public static final StrConfOption MAPPING_INPUT_FORMAT_DESCRIPTIONS = |
| new StrConfOption("giraph.multiMappingInput.descriptions", null, |
| "MappingInputFormats description - JSON array containing a JSON " + |
| "array for each mapping input. Mapping input JSON arrays contain " + |
| "one or two elements - first one is the name of mapping input " + |
| "class, and second one is JSON object with all specific parameters " + |
| "for this mapping input. For example: [[\"VIF1\",{\"p\":\"v1\"}]," + |
| "[\"VIF2\",{\"p\":\"v2\",\"q\":\"v\"}]]\""); |
| |
| /** |
| * Constructor with mapping input format class |
| * |
| * @param mappingInputFormatClass Mapping input format class |
| */ |
| public MappingInputFormatDescription( |
| Class<? extends MappingInputFormat<I, V, E, B>> mappingInputFormatClass |
| ) { |
| super(mappingInputFormatClass); |
| } |
| |
| /** |
| * Constructor with json string describing this input format |
| * |
| * @param description Json string describing this input format |
| */ |
| public MappingInputFormatDescription(String description) { |
| super(description); |
| } |
| |
| /** |
| * Create a copy of configuration which additionally has all parameters for |
| * this input format set |
| * |
| * @param conf Configuration which we want to create a copy from |
| * @return Copy of configuration |
| */ |
| private ImmutableClassesGiraphConfiguration<I, V, E> |
| createConfigurationCopy( |
| ImmutableClassesGiraphConfiguration<I, V, E> conf) { |
| ImmutableClassesGiraphConfiguration<I, V, E> confCopy = |
| new ImmutableClassesGiraphConfiguration<I, V, E>(conf); |
| confCopy.setMappingInputFormatClass(getInputFormatClass()); |
| putParametersToConfiguration(confCopy); |
| return confCopy; |
| } |
| |
| /** |
| * Get descriptions of mapping input formats from configuration. |
| * |
| * @param conf Configuration |
| * @param <I> Vertex id |
| * @param <V> Vertex data |
| * @param <E> Edge data |
| * @param <B> Mapping target |
| * @return List of mapping input format descriptions |
| */ |
| public static <I extends WritableComparable, V extends Writable, |
| E extends Writable, B extends Writable> |
| List<MappingInputFormatDescription<I, V, E, B>> |
| getMappingInputFormatDescriptions(Configuration conf) { |
| String mappingInputFormatDescriptions = |
| MAPPING_INPUT_FORMAT_DESCRIPTIONS.get(conf); |
| if (mappingInputFormatDescriptions == null) { |
| return Lists.newArrayList(); |
| } |
| try { |
| JSONArray inputFormatsJson = new JSONArray( |
| mappingInputFormatDescriptions); |
| List<MappingInputFormatDescription<I, V, E, B>> descriptions = |
| Lists.newArrayListWithCapacity(inputFormatsJson.length()); |
| for (int i = 0; i < inputFormatsJson.length(); i++) { |
| descriptions.add(new MappingInputFormatDescription<I, V, E, B>( |
| inputFormatsJson.getJSONArray(i).toString())); |
| } |
| return descriptions; |
| } catch (JSONException e) { |
| throw new IllegalStateException("getMappingInputFormatDescriptions: " + |
| "JSONException occurred while trying to process " + |
| mappingInputFormatDescriptions, e); |
| } |
| } |
| |
| /** |
| * Create all mapping input formats |
| * |
| * @param conf Configuration |
| * @param <I> Vertex id |
| * @param <V> Vertex data |
| * @param <E> Edge data |
| * @param <B> Mapping target data |
| * @return List with all mapping input formats |
| */ |
| public static <I extends WritableComparable, V extends Writable, |
| E extends Writable, B extends Writable> |
| List<MappingInputFormat<I, V, E, B>> createMappingInputFormats( |
| ImmutableClassesGiraphConfiguration<I, V, E> conf) { |
| List<MappingInputFormatDescription<I, V, E, B>> descriptions = |
| getMappingInputFormatDescriptions(conf); |
| List<MappingInputFormat<I, V, E, B>> mappingInputFormats = |
| Lists.newArrayListWithCapacity(descriptions.size()); |
| for (MappingInputFormatDescription<I, V, E, B> description : descriptions) { |
| ImmutableClassesGiraphConfiguration<I, V, E> confCopy = |
| description.createConfigurationCopy(conf); |
| mappingInputFormats.add((MappingInputFormat<I, V, E, B>) |
| confCopy.createWrappedMappingInputFormat()); |
| } |
| return mappingInputFormats; |
| } |
| } |