1 package org.e2etrace.trace;
2
3 /*
4 * Copyright 2006 Gunther Popp
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 import java.io.Serializable;
20
21 /**
22 * Base class for trace step ids.
23 * <p>
24 *
25 * This class ensures that all trace step id use the same <code>equals</code>
26 * and <code>hashCode</code> implementation based on the string representation
27 * of the trace step id.
28 * <p>
29 *
30 * @author Gunther Popp
31 *
32 */
33 public class AbstractTraceStepId implements ITraceStepId, Serializable {
34
35 private static final long serialVersionUID = 1L;
36 private String id;
37
38 /**
39 * Constructor.
40 * <p>
41 *
42 * @param idAsString string representation of the trace step id.
43 * <p>
44 */
45 protected AbstractTraceStepId(String idAsString) {
46 this.id = idAsString;
47 }
48
49 /** {@inheritDoc} */
50 public int hashCode() {
51 final int PRIME = 31;
52 int result = 1;
53 result = PRIME * result + ((id == null) ? 0 : id.hashCode());
54 return result;
55 }
56
57 /** {@inheritDoc} */
58 public boolean equals(Object obj) {
59 if (this == obj)
60 return true;
61 if (obj == null)
62 return false;
63 final AbstractTraceStepId other = (AbstractTraceStepId) obj;
64 if (id == null) {
65 if (other.id != null)
66 return false;
67 } else if (!id.equals(other.id))
68 return false;
69 return true;
70 }
71
72 /** {@inheritDoc} */
73 public String asString() {
74 return this.id;
75 }
76
77 }