content: /*
   * 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 io.ray.streaming.state.backend;
  
  import io.ray.streaming.state.backend.impl.MemoryStateBackend;
  import io.ray.streaming.state.config.ConfigKey;
  import java.util.Map;
  
  /** State Backend Builder. */
  public class StateBackendBuilder {
  
    private static AbstractStateBackend getStateBackend(
        Map<String, String> config, BackendType type) {
      switch (type) {
        case MEMORY:
          return new MemoryStateBackend(config);
        default:
          throw new RuntimeException(type.name() + " not supported");
      }
    }
  
    public static AbstractStateBackend buildStateBackend(Map<String, String> config) {
      BackendType type;
      if (config == null) {
        type = BackendType.MEMORY;
      } else {
        type = BackendType.getEnum(config.get(ConfigKey.STATE_BACKEND_TYPE));
      }
  
      return getStateBackend(config, type);
    }
  }
  