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1
56
57 package org.objectstyle.cayenne.event;
58
59 import java.util.Map  ;
60
61 import org.apache.commons.collections.map.ReferenceMap;
62
63
78
79 public class EventSubject extends Object {
80
81 private static Map _registeredSubjects =
83 new ReferenceMap(ReferenceMap.HARD, ReferenceMap.WEAK);
84
85 private String _fullyQualifiedSubjectName;
87
88
96 public static EventSubject getSubject(Class subjectOwner, String subjectName) {
97 if (subjectOwner == null) {
98 throw new IllegalArgumentException ("Owner class must not be null.");
99 }
100
101 if ((subjectName == null) || (subjectName.length() == 0)) {
102 throw new IllegalArgumentException ("Subject name must not be null or empty.");
103 }
104
105 String fullSubjectName = subjectOwner.getName() + "/" + subjectName;
106 EventSubject newSubject = (EventSubject) _registeredSubjects.get(fullSubjectName);
107 if (newSubject == null) {
108 newSubject = new EventSubject(fullSubjectName);
109 _registeredSubjects.put(newSubject.getSubjectName(), newSubject);
110 }
111
112 return newSubject;
113 }
114
115
118 private EventSubject() {
119 }
120
121
126 protected EventSubject(String fullSubjectName) {
127 super();
128 _fullyQualifiedSubjectName = fullSubjectName;
129 }
130
131 public boolean equals(Object obj) {
132 if (obj instanceof EventSubject) {
133 return _fullyQualifiedSubjectName.equals(
134 ((EventSubject) obj).getSubjectName());
135 }
136
137 return false;
138 }
139
140 public int hashCode() {
141 return (super.hashCode() ^ _fullyQualifiedSubjectName.hashCode());
142 }
143
144 public String getSubjectName() {
145 return _fullyQualifiedSubjectName;
146 }
147
148
154 public String toString() {
155 StringBuffer buf = new StringBuffer (64);
156
157 buf.append("<");
158 buf.append(this.getClass().getName());
159 buf.append(" 0x");
160 buf.append(Integer.toHexString(System.identityHashCode(this)));
161 buf.append("> ");
162 buf.append(_fullyQualifiedSubjectName);
163
164 return buf.toString();
165 }
166
167 }
168 |
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