/*
    * 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.repository.internal;
  
  import org.apache.maven.model.building.ModelCache;
  import org.eclipse.aether.RepositoryCache;
  import org.eclipse.aether.RepositorySystemSession;
  
  /**
   * A model builder cache backed by the repository system cache.
   *
   * @author Benjamin Bentmann
   */
  class DefaultModelCache implements ModelCache {
  
      private final RepositorySystemSession session;
  
      private final RepositoryCache cache;
  
      public static ModelCache newInstance(RepositorySystemSession session) {
          if (session.getCache() == null) {
              return null;
          } else {
              return new DefaultModelCache(session);
          }
      }
  
      private DefaultModelCache(RepositorySystemSession session) {
          this.session = session;
          this.cache = session.getCache();
      }
  
      @Override
      public Object get(String groupId, String artifactId, String version, String tag) {
          return cache.get(session, new Key(groupId, artifactId, version, tag));
      }
  
      @Override
      public void put(String groupId, String artifactId, String version, String tag, Object data) {
          cache.put(session, new Key(groupId, artifactId, version, tag), data);
      }
  
      static class Key {
  
          private final String groupId;
  
          private final String artifactId;
  
          private final String version;
  
          private final String tag;
  
          private final int hash;
  
          Key(String groupId, String artifactId, String version, String tag) {
              this.groupId = groupId;
              this.artifactId = artifactId;
              this.version = version;
              this.tag = tag;
  
              int h = 17;
              h = h * 31 + this.groupId.hashCode();
              h = h * 31 + this.artifactId.hashCode();
              h = h * 31 + this.version.hashCode();
              h = h * 31 + this.tag.hashCode();
              hash = h;
          }
  
          @Override
          public boolean equals(Object obj) {
              if (this == obj) {
                  return true;
              }
              if (null == obj || !getClass().equals(obj.getClass())) {
                  return false;
              }
  
              Key that = (Key) obj;
              return artifactId.equals(that.artifactId)
                      && groupId.equals(that.groupId)
                      && version.equals(that.version)
                      && tag.equals(that.tag);
          }
 
         @Override
         public int hashCode() {
             return hash;
         }
     }
 }