/*
    * 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.maven.artifact.handler.manager;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.handler.DefaultArtifactHandler;
  import org.apache.maven.eventspy.AbstractEventSpy;
  import org.apache.maven.execution.ExecutionEvent;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   */
  @Named
  @Singleton
  public class LegacyArtifactHandlerManager extends AbstractEventSpy {
      private final Map<String, ArtifactHandler> artifactHandlers;
  
      private final Map<String, ArtifactHandler> allHandlers = new ConcurrentHashMap<>();
  
      @Inject
      public LegacyArtifactHandlerManager(Map<String, ArtifactHandler> artifactHandlers) {
          this.artifactHandlers = requireNonNull(artifactHandlers);
      }
  
      @Override
      public void onEvent(Object event) {
          if (event instanceof ExecutionEvent) {
              ExecutionEvent executionEvent = (ExecutionEvent) event;
              if (executionEvent.getType() == ExecutionEvent.Type.SessionEnded) {
                  allHandlers.clear();
              }
          }
      }
  
      public ArtifactHandler getArtifactHandler(String type) {
          requireNonNull(type, "null type");
          ArtifactHandler handler = allHandlers.get(type);
          if (handler == null) {
              handler = artifactHandlers.get(type);
              if (handler == null) {
                  handler = new DefaultArtifactHandler(type);
              } else {
                  allHandlers.put(type, handler);
              }
          }
          return handler;
      }
  }