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1   package org.apache.maven.container;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import org.codehaus.plexus.PlexusContainer;
23  import org.codehaus.plexus.component.repository.ComponentDescriptor;
24  
25  import java.util.HashMap;
26  import java.util.LinkedHashMap;
27  import java.util.Map;
28  import java.util.Set;
29  
30  public class ContainerUtils
31  {
32      
33      public static Set<String> findChildComponentHints( String role, PlexusContainer parent, PlexusContainer child )
34      {
35          return findChildComponents( role, parent, child ).keySet();
36      }
37      
38      @SuppressWarnings( "unchecked" )
39      public static Map<String, ComponentDescriptor> findChildComponents( String role, PlexusContainer parent, PlexusContainer child )
40      {
41          Map<String, ComponentDescriptor> parentComponents = parent.getComponentDescriptorMap( role );
42          if ( parentComponents != null )
43          {
44              parentComponents = new LinkedHashMap<String, ComponentDescriptor>( parentComponents );
45          }
46          
47          Map<String, ComponentDescriptor> childComponents = child.getComponentDescriptorMap( role );
48          if ( childComponents == null )
49          {
50              return new HashMap<String, ComponentDescriptor>();
51          }
52          else
53          {
54              childComponents = new LinkedHashMap<String, ComponentDescriptor>( childComponents );
55              if ( parentComponents != null && !parentComponents.isEmpty() )
56              {
57                  for ( Map.Entry<String, ComponentDescriptor> entry : parentComponents.entrySet() )
58                  {
59                      String hint = entry.getKey();
60                      
61                      if ( childComponents.containsKey( hint ) && entry.getValue() == childComponents.get( hint ) )
62                      {
63                          childComponents.remove( hint );
64                      }
65                  }
66              }
67          }
68          
69          return childComponents;
70      }
71  
72  }