| /* |
| * 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.druid.query; |
| |
| import com.google.inject.Inject; |
| |
| import java.util.IdentityHashMap; |
| import java.util.Map; |
| |
| /** |
| */ |
| public class DefaultQueryRunnerFactoryConglomerate implements QueryRunnerFactoryConglomerate |
| { |
| private final Map<Class<? extends Query>, QueryRunnerFactory> factories; |
| |
| @Inject |
| public DefaultQueryRunnerFactoryConglomerate(Map<Class<? extends Query>, QueryRunnerFactory> factories) |
| { |
| // Accesses to IdentityHashMap should be faster than to HashMap or ImmutableMap. |
| // Class doesn't override Object.equals(). |
| this.factories = new IdentityHashMap<>(factories); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public <T, QueryType extends Query<T>> QueryRunnerFactory<T, QueryType> findFactory(QueryType query) |
| { |
| return (QueryRunnerFactory<T, QueryType>) factories.get(query.getClass()); |
| } |
| } |