content: package org.apache.archiva.repository.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.
   */
  
  import org.apache.archiva.repository.ManagedRepositoryContent;
  import org.apache.archiva.repository.ItemConversionException;
  import org.apache.archiva.repository.storage.StorageAsset;
  
  import java.util.Map;
  
  public interface ContentItem
  {
      /**
       * Returns the repository type specific implementation
       *
       * @param clazz the specific implementation class
       * @param <T>   the class or interface
       * @return the specific project implementation
       */
      <T extends ContentItem> T adapt( Class<T> clazz ) throws ItemConversionException;
  
      /**
       * Returns <code>true</code>, if this project supports the given adaptor class.
       *
       * @param clazz the class to convert this project to
       * @param <T>   the type
       * @return <code>true/code>, if the implementation is supported, otherwise false
       */
      <T extends ContentItem> boolean hasCharacteristic( Class<T> clazz );
  
      <T extends ContentItem> void setCharacteristic( Class<T> clazz, T item );
  
      /**
       * Additional attributes
       *
       * @return the additional attributes
       */
      Map<String, String> getAttributes( );
  
      /**
       * Returns the attribute value for the given key.
       *
       * @param key the attribute key
       * @return the value, if the key exists, otherwise <code>null</code>
       */
      String getAttribute( String key );
  
      /**
       * Returns the storage representation of the artifact. The asset must not exist.
       *
       * @return the asset this artifact corresponds to.
       */
      StorageAsset getAsset( );
  
  
      /**
       * The repository this project is part of.
       *
       * @return the repository content
       */
      ManagedRepositoryContent getRepository( );
  
      /**
       * Returns <code>true</code>, if the item exists, otherwise <code>false</code>
       * @return <code>true</code>, if the item exists, otherwise <code>false</code>
       */
      boolean exists();
  
  }
  