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1
57 package org.objectstyle.cayenne.project;
58
59 import java.util.Arrays  ;
60
61
74 public class ProjectPath {
75 public static final Object [] EMPTY_PATH = new Object [0];
76
77 protected Object [] path;
78
79 public ProjectPath() {
80 path = EMPTY_PATH;
81 }
82
83
86 public ProjectPath(Object object) {
87 path = new Object [] { object };
88 }
89
90
93 public ProjectPath(Object [] path) {
94 this.path = (path != null) ? path : EMPTY_PATH;
95 }
96
97 public Object [] getPath() {
98 return path;
99 }
100
101 public boolean isEmpty() {
102 return path == null || path.length == 0;
103 }
104
105
108 public Object firstInstanceOf(Class aClass) {
109 for (int i = 0; i < path.length; i++) {
110 if (path[i] != null && aClass.isAssignableFrom(path[i].getClass())) {
111 return path[i];
112 }
113 }
114
115 return null;
116 }
117
118
122 public ProjectPath appendToPath(Object object) {
123 if (object != null) {
124 Object [] newPath = new Object [path.length + 1];
125
126 if (path.length > 0) {
127 System.arraycopy(path, 0, newPath, 0, path.length);
128 }
129 newPath[path.length] = object;
130 return new ProjectPath(newPath);
131 }
132 else {
133 return this;
134 }
135 }
136
137
141 public ProjectPath subpathWithSize(int subpathSize) {
142 if (subpathSize <= 0) {
143 return new ProjectPath();
144 }
145 else if(subpathSize == path.length) {
146 return this;
147 }
148
149 if (subpathSize > path.length) {
150 throw new ArrayIndexOutOfBoundsException (
151 "Subpath is longer than this path "
152 + subpathSize
153 + " components. Path size: "
154 + path.length);
155 }
156
157 Object [] newPath = new Object [subpathSize];
158 System.arraycopy(path, 0, newPath, 0, subpathSize);
159 return new ProjectPath(newPath);
160 }
161
162
167 public ProjectPath subpathOfObject(Object object) {
168 for (int i = 0; i < path.length; i++) {
169 if (path[i] == object) {
170 return subpathWithSize(i + 1);
172 }
173 }
174
175 return null;
176 }
177
178
181 public Object getRoot() {
182 if (path.length == 0) {
183 return null;
184 }
185
186 return path[0];
187 }
188
189
192 public Object getObject() {
193 if (path.length == 0) {
194 return null;
195 }
196
197 return path[path.length - 1];
199 }
200
201
206 public Object getObjectParent() {
207 if (path.length == 0) {
208 return null;
209 }
210
211 return (path.length > 1) ? path[path.length - 2] : null;
213 }
214
215 public String toString() {
216 StringBuffer buf = new StringBuffer ();
217 buf.append("[ProjectPath: ");
218 for (int i = 0; i < path.length; i++) {
219 if (i > 0) {
220 buf.append(", ");
221 }
222
223 String token = (path[i] != null) ? path[i].getClass().getName() : "<null>";
224 buf.append(token);
225 }
226 buf.append("]");
227 return buf.toString();
228 }
229
230 public boolean equals(Object object) {
231 if (object == this) {
232 return true;
233 }
234
235 if (!(object instanceof ProjectPath)) {
236 return false;
237 }
238
239 ProjectPath otherPath = (ProjectPath) object;
240 return Arrays.equals(getPath(), otherPath.getPath());
241 }
242 }
243 |
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