EmptyPicoContainer


1   /*****************************************************************************
2    * Copyright (C) PicoContainer Organization. All rights reserved.            *
3    * ------------------------------------------------------------------------- *
4    * The software in this package is published under the terms of the BSD      *
5    * style license a copy of which has been included with this distribution in *
6    * the LICENSE.txt file.                                                     *
7    *                                                                           *
8    * Original code by Paul Hammant                                             *
9    *****************************************************************************/
10  package org.picocontainer.alternatives;
11  
12  import java.io.Serializable  ;
13  import java.util.Collections  ;
14  import java.util.Collection  ;
15  import java.util.List  ;
16  import org.picocontainer.PicoContainer;
17  import org.picocontainer.PicoVisitor;
18  import org.picocontainer.ComponentAdapter;
19  
20  /**
21   * empty pico container serving as recoil damper in situations where you 
22   * do not like to check whether container reference suplpied to you 
23   * is null or not
24   * @author  Konstantin Pribluda 
25   * @since 1.1
26  */
27  public class EmptyPicoContainer implements PicoContainer, Serializable   {
28      public Object   getComponentInstance(Object   componentKey) {
29          return null;
30      }
31     
32      public Object   getComponentInstanceOfType(Class   componentType) {
33          return null;
34      }
35      public List   getComponentInstances() {
36          return Collections.EMPTY_LIST;
37      }
38      
39      public PicoContainer getParent() {
40          return null;
41      }
42      public ComponentAdapter getComponentAdapter(Object   componentKey) {
43          return null;
44      }
45      
46      public ComponentAdapter getComponentAdapterOfType(Class   componentType) {
47          return null;
48      }
49     
50      public Collection   getComponentAdapters() {
51          return Collections.EMPTY_LIST;
52      }
53      
54      public List   getComponentAdaptersOfType(Class   componentType) {
55          return Collections.EMPTY_LIST;
56      }
57      
58      public void verify()  {}
59      
60      public void accept(PicoVisitor visitor) { }
61      
62      public List   getComponentInstancesOfType(Class   componentType) {
63          return Collections.EMPTY_LIST;
64      }
65  
66      public void start() {}
67      public void stop() {}
68      public void dispose() {}
69  }
70
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