Java tutorial
/* * Licensed to Elasticsearch under one or more contributor * license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright * ownership. Elasticsearch 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.elasticsearch.action.admin.indices.mapping.get; import com.google.common.base.Predicate; import com.google.common.collect.Collections2; import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableMap; import org.elasticsearch.ElasticsearchException; import org.elasticsearch.action.admin.indices.mapping.get.GetFieldMappingsResponse.FieldMappingMetaData; import org.elasticsearch.action.support.single.custom.TransportSingleCustomOperationAction; import org.elasticsearch.cluster.ClusterService; import org.elasticsearch.cluster.ClusterState; import org.elasticsearch.cluster.block.ClusterBlockException; import org.elasticsearch.cluster.block.ClusterBlockLevel; import org.elasticsearch.cluster.routing.ShardsIterator; import org.elasticsearch.common.collect.MapBuilder; import org.elasticsearch.common.inject.Inject; import org.elasticsearch.common.regex.Regex; import org.elasticsearch.common.settings.Settings; import org.elasticsearch.common.xcontent.ToXContent; import org.elasticsearch.common.xcontent.XContentBuilder; import org.elasticsearch.common.xcontent.XContentFactory; import org.elasticsearch.common.xcontent.XContentType; import org.elasticsearch.index.Index; import org.elasticsearch.index.mapper.DocumentMapper; import org.elasticsearch.index.mapper.FieldMapper; import org.elasticsearch.index.service.IndexService; import org.elasticsearch.indices.IndicesService; import org.elasticsearch.indices.TypeMissingException; import org.elasticsearch.threadpool.ThreadPool; import org.elasticsearch.transport.TransportService; import java.io.IOException; import java.util.Collection; /** */ public class TransportGetFieldMappingsIndexAction extends TransportSingleCustomOperationAction<GetFieldMappingsIndexRequest, GetFieldMappingsResponse> { protected final ClusterService clusterService; private final IndicesService indicesService; @Inject public TransportGetFieldMappingsIndexAction(Settings settings, ClusterService clusterService, TransportService transportService, IndicesService indicesService, ThreadPool threadPool) { super(settings, threadPool, clusterService, transportService); this.clusterService = clusterService; this.indicesService = indicesService; } @Override protected String transportAction() { return GetFieldMappingsAction.NAME + "/index"; } @Override protected String executor() { return ThreadPool.Names.MANAGEMENT; } @Override protected ShardsIterator shards(ClusterState state, GetFieldMappingsIndexRequest request) { // Will balance requests between shards return state.routingTable().index(request.index()).randomAllActiveShardsIt(); } @Override protected GetFieldMappingsResponse shardOperation(final GetFieldMappingsIndexRequest request, int shardId) throws ElasticsearchException { IndexService indexService = indicesService.indexServiceSafe(request.index()); Collection<String> typeIntersection; if (request.types().length == 0) { typeIntersection = indexService.mapperService().types(); } else { typeIntersection = Collections2.filter(indexService.mapperService().types(), new Predicate<String>() { @Override public boolean apply(String type) { return Regex.simpleMatch(request.types(), type); } }); if (typeIntersection.isEmpty()) { throw new TypeMissingException(new Index(request.index()), request.types()); } } MapBuilder<String, ImmutableMap<String, FieldMappingMetaData>> typeMappings = new MapBuilder<>(); for (String type : typeIntersection) { DocumentMapper documentMapper = indexService.mapperService().documentMapper(type); ImmutableMap<String, FieldMappingMetaData> fieldMapping = findFieldMappingsByType(documentMapper, request); if (!fieldMapping.isEmpty()) { typeMappings.put(type, fieldMapping); } } return new GetFieldMappingsResponse(ImmutableMap.of(request.index(), typeMappings.immutableMap())); } @Override protected GetFieldMappingsIndexRequest newRequest() { return new GetFieldMappingsIndexRequest(); } @Override protected GetFieldMappingsResponse newResponse() { return new GetFieldMappingsResponse(); } @Override protected ClusterBlockException checkGlobalBlock(ClusterState state, GetFieldMappingsIndexRequest request) { return state.blocks().globalBlockedException(ClusterBlockLevel.READ); } @Override protected ClusterBlockException checkRequestBlock(ClusterState state, GetFieldMappingsIndexRequest request) { return state.blocks().indexBlockedException(ClusterBlockLevel.READ, request.index()); } private static final ToXContent.Params includeDefaultsParams = new ToXContent.Params() { final static String INCLUDE_DEFAULTS = "include_defaults"; @Override public String param(String key) { if (INCLUDE_DEFAULTS.equals(key)) { return "true"; } return null; } @Override public String param(String key, String defaultValue) { if (INCLUDE_DEFAULTS.equals(key)) { return "true"; } return defaultValue; } @Override public boolean paramAsBoolean(String key, boolean defaultValue) { if (INCLUDE_DEFAULTS.equals(key)) { return true; } return defaultValue; } public Boolean paramAsBoolean(String key, Boolean defaultValue) { if (INCLUDE_DEFAULTS.equals(key)) { return true; } return defaultValue; } @Override @Deprecated public Boolean paramAsBooleanOptional(String key, Boolean defaultValue) { return paramAsBoolean(key, defaultValue); } }; private ImmutableMap<String, FieldMappingMetaData> findFieldMappingsByType(DocumentMapper documentMapper, GetFieldMappingsIndexRequest request) throws ElasticsearchException { MapBuilder<String, FieldMappingMetaData> fieldMappings = new MapBuilder<>(); ImmutableList<FieldMapper> allFieldMappers = documentMapper.mappers().mappers(); for (String field : request.fields()) { if (Regex.isMatchAllPattern(field)) { for (FieldMapper fieldMapper : allFieldMappers) { addFieldMapper(fieldMapper.names().fullName(), fieldMapper, fieldMappings, request.includeDefaults()); } } else if (Regex.isSimpleMatchPattern(field)) { // go through the field mappers 3 times, to make sure we give preference to the resolve order: full name, index name, name. // also make sure we only store each mapper once. boolean[] resolved = new boolean[allFieldMappers.size()]; for (int i = 0; i < allFieldMappers.size(); i++) { FieldMapper fieldMapper = allFieldMappers.get(i); if (Regex.simpleMatch(field, fieldMapper.names().fullName())) { addFieldMapper(fieldMapper.names().fullName(), fieldMapper, fieldMappings, request.includeDefaults()); resolved[i] = true; } } for (int i = 0; i < allFieldMappers.size(); i++) { if (resolved[i]) { continue; } FieldMapper fieldMapper = allFieldMappers.get(i); if (Regex.simpleMatch(field, fieldMapper.names().indexName())) { addFieldMapper(fieldMapper.names().indexName(), fieldMapper, fieldMappings, request.includeDefaults()); resolved[i] = true; } } for (int i = 0; i < allFieldMappers.size(); i++) { if (resolved[i]) { continue; } FieldMapper fieldMapper = allFieldMappers.get(i); if (Regex.simpleMatch(field, fieldMapper.names().name())) { addFieldMapper(fieldMapper.names().name(), fieldMapper, fieldMappings, request.includeDefaults()); resolved[i] = true; } } } else { // not a pattern FieldMapper fieldMapper = documentMapper.mappers().smartNameFieldMapper(field); if (fieldMapper != null) { addFieldMapper(field, fieldMapper, fieldMappings, request.includeDefaults()); } else if (request.probablySingleFieldRequest()) { fieldMappings.put(field, FieldMappingMetaData.NULL); } } } return fieldMappings.immutableMap(); } private void addFieldMapper(String field, FieldMapper fieldMapper, MapBuilder<String, FieldMappingMetaData> fieldMappings, boolean includeDefaults) { if (fieldMappings.containsKey(field)) { return; } try { XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON); builder.startObject(); fieldMapper.toXContent(builder, includeDefaults ? includeDefaultsParams : ToXContent.EMPTY_PARAMS); builder.endObject(); fieldMappings.put(field, new FieldMappingMetaData(fieldMapper.names().fullName(), builder.bytes())); } catch (IOException e) { throw new ElasticsearchException("failed to serialize XContent of field [" + field + "]", e); } } }