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 }