content: package org.apache.archiva.metadata.model;
  
  /*
   * 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 java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Base class for metadata that is contains facets for storing extensions by various plugins.
   */
  public abstract class FacetedMetadata
  {
      /**
       * The facets to store, keyed by the {@linkplain MetadataFacet#getFacetId() Facet ID} of the metadata.
       */
      private Map<String, MetadataFacet> facets = new HashMap<>();
  
      /**
       * Add a new facet to the metadata. If it already exists, it will be replaced.
       *
       * @param metadataFacet the facet to add
       */
      public void addFacet( MetadataFacet metadataFacet )
      {
          this.facets.put( metadataFacet.getFacetId(), metadataFacet );
      }
  
      /**
       * Get a particular facet of metadata.
       *
       * @param facetId the facet ID
       * @return the facet of the metadata.
       */
      public MetadataFacet getFacet( String facetId )
      {
          return this.facets.get( facetId );
      }
  
      public MetadataFacet removeFacet( String facetId )
      {
          return this.facets.remove( facetId );
      }
  
      /**
       * Get all the facets available on this metadata.
       *
       * @return the facets of the metadata
       */
      public Collection<MetadataFacet> getFacetList()
      {
          return this.facets.values();
      }
  
      /**
       * Get all the keys of the facets available on this metadata.
       *
       * @return the collection of facet IDs.
       */
      public Collection<String> getFacetIds()
      {
          return this.facets.keySet();
      }
  
      /**
       * Get all available facets as a Map (typically used by bean rendering, such as in Archiva's JSPs).
       *
       * @return the map of facets
       * @see #facets
       */
      public Map<String, MetadataFacet> getFacets()
      {
          return Collections.unmodifiableMap( facets );
      }
  }
  