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22 package javax.jdo.identity;
23
24 import java.io.IOException;
25 import java.io.ObjectInput;
26 import java.io.ObjectOutput;
27
28 /*** This class is for identity with a single int field.
29 * @version 2.0
30 */
31 public class IntIdentity extends SingleFieldIdentity {
32
33 private int key;
34
35 private void construct(int key) {
36 this.key = key;
37 hashCode = hashClassName() ^ key;
38 }
39
40 /*** Constructor with class and key.
41 * @param pcClass the class
42 * @param key the key
43 */
44 public IntIdentity (Class pcClass, int key) {
45 super(pcClass);
46 construct(key);
47 }
48
49 /*** Constructor with class and key.
50 * @param pcClass the class
51 * @param key the key
52 */
53 public IntIdentity (Class pcClass, Integer key) {
54 super(pcClass);
55 setKeyAsObject(key);
56 construct(key.intValue ());
57 }
58
59
60 /*** Constructor with class and key.
61 * @param pcClass the class
62 * @param str the key
63 */
64 public IntIdentity (Class pcClass, String str) {
65 super(pcClass);
66 assertKeyNotNull(str);
67 construct(Integer.parseInt(str));
68 }
69
70 /*** Constructor only for Externalizable.
71 */
72 public IntIdentity () {
73 }
74
75 /*** Return the key.
76 * @return the key
77 */
78 public int getKey () {
79 return key;
80 }
81
82 /*** Return the String form of the key.
83 * @return the String form of the key
84 */
85 public String toString () {
86 return Integer.toString(key);
87 }
88
89 /*** Determine if the other object represents the same object id.
90 * @param obj the other object
91 * @return true if both objects represent the same object id
92 */
93 public boolean equals (Object obj) {
94 if (this == obj) {
95 return true;
96 } else if (!super.equals (obj)) {
97 return false;
98 } else {
99 IntIdentity other = (IntIdentity) obj;
100 return key == other.key;
101 }
102 }
103
104 /*** Create the key as an Object.
105 * @return the key as an Object
106 * @since 2.0
107 */
108 protected Object createKeyAsObject() {
109 return new Integer(key);
110 }
111
112 /*** Write this object. Write the superclass first.
113 * @param out the output
114 */
115 public void writeExternal(ObjectOutput out) throws IOException {
116 super.writeExternal (out);
117 out.writeInt(key);
118 }
119
120 /*** Read this object. Read the superclass first.
121 * @param in the input
122 */
123 public void readExternal(ObjectInput in)
124 throws IOException, ClassNotFoundException {
125 super.readExternal (in);
126 key = in.readInt();
127 }
128 }