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56 package org.objectstyle.cayenne.distribution;
57
58 import java.io.Serializable  ;
59 import java.util.Arrays ;
60 import java.util.Collections ;
61 import java.util.Iterator ;
62 import java.util.Map ;
63
64 import org.apache.commons.lang.builder.EqualsBuilder;
65 import org.apache.commons.lang.builder.HashCodeBuilder;
66 import org.apache.commons.lang.builder.ToStringBuilder;
67 import org.objectstyle.cayenne.util.IDUtil;
68 import org.objectstyle.cayenne.util.Util;
69
70
76 public class GlobalID implements Serializable {
78
79 protected String entityName;
80 protected Map objectIdKeys;
81
82 protected byte[] key;
83
84
87 public GlobalID(String entityName) {
90 this.entityName = entityName;
91 this.key = IDUtil.pseudoUniqueByteSequence16();
92 }
93
94 public GlobalID(String entityName, byte[] key) {
95 this.entityName = entityName;
96 this.key = key;
97 }
98
99
102 public GlobalID(String entityName, Map idKeys) {
103 this.entityName = entityName;
104 this.objectIdKeys = Collections.unmodifiableMap(idKeys);
105 }
106
107 public boolean isTemporary() {
108 return key != null;
109 }
110
111 public String getEntityName() {
112 return entityName;
113 }
114
115 public byte[] getKey() {
116 return key;
117 }
118
119 public Map getObjectIdKeys() {
120 return objectIdKeys;
121 }
122
123 public boolean equals(Object object) {
124 if (this == object) {
125 return true;
126 }
127
128 if (!(object instanceof GlobalID)) {
129 return false;
130 }
131
132 GlobalID id = (GlobalID) object;
133
134 if (isTemporary()) {
135 return new EqualsBuilder()
136 .append(entityName, entityName)
137 .append(key, id.key)
138 .isEquals();
139 }
140
141 if (!Util.nullSafeEquals(entityName, id.entityName)) {
142 return false;
143 }
144
145 if (id.objectIdKeys == null && objectIdKeys == null) {
146 return true;
147 }
148
149 if (id.objectIdKeys == null || objectIdKeys == null) {
150 return false;
151 }
152
153 if (id.objectIdKeys.size() != objectIdKeys.size()) {
154 return false;
155 }
156
157 EqualsBuilder builder = new EqualsBuilder();
158 Iterator entries = objectIdKeys.entrySet().iterator();
159 while (entries.hasNext()) {
160 Map.Entry entry = (Map.Entry ) entries.next();
161
162 Object key = entry.getKey();
163 Object value = entry.getValue();
164 if (value == null) {
165 if (id.objectIdKeys.get(key) != null || !id.objectIdKeys.containsKey(key)) {
166 return false;
167 }
168 }
169 else {
170 builder.append(value, id.objectIdKeys.get(key));
172 if (!builder.isEquals()) {
173 return false;
174 }
175 }
176 }
177
178 return true;
179 }
180
181 public int hashCode() {
182
183
185 HashCodeBuilder builder = new HashCodeBuilder(3, 5);
186 builder.append(entityName.hashCode());
187
188 if (key != null) {
189 builder.append(key);
190 }
191
192 if (objectIdKeys != null) {
193 int len = objectIdKeys.size();
194
195 if (len == 1) {
197 Iterator entries = objectIdKeys.entrySet().iterator();
198 Map.Entry entry = (Map.Entry ) entries.next();
199 builder.append(entry.getKey()).append(entry.getValue());
200 }
201 else {
203 Object [] keys = objectIdKeys.keySet().toArray();
204 Arrays.sort(keys);
205
206 for (int i = 0; i < len; i++) {
207
210 builder.append(i).append(objectIdKeys.get(keys[i]));
213 }
214 }
215 }
216
217 return builder.toHashCode();
218 }
219
220 public String toString() {
221 ToStringBuilder builder = new ToStringBuilder(this);
222
223 builder.append("entityName", entityName);
224 builder.append("temporary", isTemporary());
225
226 if (isTemporary()) {
227 builder.append("key", key);
228 }
229 else if (objectIdKeys != null) {
230 Iterator it = objectIdKeys.entrySet().iterator();
231 while (it.hasNext()) {
232 Map.Entry entry = (Map.Entry ) it.next();
233 builder.append(String.valueOf(entry.getKey()), entry.getValue());
234 }
235 }
236 return builder.toString();
237 }
238 }
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