| /* |
| * 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.drill.metastore.mongo.transform; |
| |
| import com.google.gson.Gson; |
| import org.apache.drill.metastore.MetastoreColumn; |
| import org.apache.drill.metastore.mongo.config.MongoConfigConstants; |
| import org.apache.drill.metastore.mongo.exception.MongoMetastoreException; |
| import com.google.common.collect.ImmutableMap; |
| import org.bson.Document; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Converts list of Metastore component units into {@link Document}. |
| * |
| * @param <T> Metastore component unit type |
| */ |
| public class InputDataTransformer<T> { |
| private static final Gson GSON = new Gson(); |
| private final List<T> units = new ArrayList<>(); |
| private final Map<String, MethodHandle> unitGetters; |
| |
| public InputDataTransformer(Map<String, MethodHandle> unitGetters) { |
| this.unitGetters = unitGetters; |
| } |
| |
| public InputDataTransformer<T> units(List<T> units) { |
| this.units.addAll(units); |
| return this; |
| } |
| |
| public Document createId(Document document) { |
| return Document.parse(GSON.toJson(ImmutableMap.of( |
| MetastoreColumn.STORAGE_PLUGIN.columnName(), document.get(MetastoreColumn.STORAGE_PLUGIN.columnName()), |
| MetastoreColumn.WORKSPACE.columnName(), document.get(MetastoreColumn.WORKSPACE.columnName()), |
| MetastoreColumn.TABLE_NAME.columnName(), document.get(MetastoreColumn.TABLE_NAME.columnName()), |
| MetastoreColumn.METADATA_TYPE.columnName(), document.get(MetastoreColumn.METADATA_TYPE.columnName()), |
| MetastoreColumn.METADATA_IDENTIFIER.columnName(), document.get(MetastoreColumn.METADATA_IDENTIFIER.columnName())))); |
| } |
| |
| public List<Document> execute() { |
| return units.stream().map(unit -> { |
| Document document = new Document(); |
| for (Map.Entry<String, MethodHandle> entry : unitGetters.entrySet()) { |
| try { |
| document.put(entry.getKey(), entry.getValue().invoke(unit)); |
| } catch (Throwable e) { |
| throw new MongoMetastoreException( |
| String.format("Unable to invoke getter for column [%s] using [%s]", entry.getKey(), entry.getValue()), e); |
| } |
| } |
| return document.append(MongoConfigConstants.ID, createId(document)); |
| }).collect(Collectors.toList()); |
| } |
| } |