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1   /*
2    * Copyright 2001-2004 The Apache Software Foundation
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.cache.adt;
17  
18  /**
19   * A simple {@link Listable} supporting singly-linked
20   * lists of arbitrary {@link Object}s.
21   *
22   * @version $Id: ListableObject.java 155435 2005-02-26 13:17:27Z dirkv $
23   * @author Rodney Waldhoff
24   */
25  public class ListableObject extends ListableBase implements Listable, Cloneable {
26    /**
27     * Equivalent to {@link #ListableObject(java.lang.Object,Listable) <tt>ListableObject(val,null)</tt>}.
28     */
29    public ListableObject(Object val) {
30      this(val,null);
31    }
32  
33    /**
34     * @param val my value
35     * @param next the next Listable.
36     */
37    public ListableObject(Object val, Listable next) {
38      super(next);
39      _val = val;
40    }
41  
42    /** My value. */
43    protected Object _val = null;
44  
45    /**
46     * Return the {@link Object} I'm wrapping.
47     * @return the {@link Object} I'm wrapping.
48     */
49    public Object getValue() {
50      return _val;
51    }
52  
53    /**
54     * Set the {@link Object} I'm wrapping.
55     * @param the {@link Object} to wrap.
56     */
57    public void setValue(Object obj) {
58      _val = obj;
59    }
60  
61  /*
62    private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
63       out.defaultWriteObject();
64       ListableObject cur = _next;
65       while(cur != null) {
66          out.writeObject(cur.getValue());
67          cur = cur.getNext();
68       }
69       out.writeObject(null);
70    }
71  
72    private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, ClassNotFoundException {
73       in.defaultReadObject();
74       Listable current = this;
75       for(;;) {
76          Object obj = in.readObject();
77          if(null == obj) {
78             break;
79          } else if(obj instanceof Listable) {
80             try {
81                current.setNext((Listable)obj);
82             } catch(UnsupportedOperationException e) {
83                // ignored
84             }
85             try {
86                ((Listable)obj).setPrev(current);
87             } catch(UnsupportedOperationException e) {
88                // ignored
89             }
90             current = (Listable)obj;
91          } else {
92             throw new java.io.IOException("Unexpected object while deserializing ListableBase: " + obj.getClass().getName());
93          }
94       }
95    }
96  */
97  
98  }