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
   *
   *    https://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.cayenne.access;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.configuration.Constants;
  import org.apache.cayenne.configuration.RuntimeProperties;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.util.SoftValueMap;
  import org.apache.cayenne.util.WeakValueMap;
  
  /**
   * Default implementation of {@link ObjectMapRetainStrategy}.
   * 
   * @since 3.1
   */
  public class DefaultObjectMapRetainStrategy implements ObjectMapRetainStrategy {
  
      private static final String WEAK_RETAIN_STRATEGY = "weak";
      private static final String SOFT_RETAIN_STRATEGY = "soft";
      private static final String HARD_RETAIN_STRATEGY = "hard";
  
      protected RuntimeProperties runtimeProperties;
  
      public DefaultObjectMapRetainStrategy(@Inject RuntimeProperties runtimeProperties) {
          this.runtimeProperties = runtimeProperties;
      }
  
      public Map<Object, Persistent> createObjectMap() {
          String strategy = runtimeProperties.get(Constants.OBJECT_RETAIN_STRATEGY_PROPERTY);
  
          if (strategy == null || WEAK_RETAIN_STRATEGY.equals(strategy)) {
              return new WeakValueMap<>();
          } else if (SOFT_RETAIN_STRATEGY.equals(strategy)) {
              return new SoftValueMap<>();
          } else if (HARD_RETAIN_STRATEGY.equals(strategy)) {
              return new HashMap<>();
          } else {
              throw new CayenneRuntimeException("Unsupported retain strategy %s", strategy);
          }
      }
  }
  