Source Code Cross Referenced for AbstractTestMapIterator.java in  » Library » Apache-common-Collections » org » apache » commons » collections » iterators » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.iterators 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 2001-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:        package org.apache.commons.collections.iterators;
017:
018:        import java.util.HashSet;
019:        import java.util.Iterator;
020:        import java.util.Map;
021:        import java.util.NoSuchElementException;
022:        import java.util.Set;
023:
024:        import org.apache.commons.collections.MapIterator;
025:
026:        /**
027:         * Abstract class for testing the MapIterator interface.
028:         * <p>
029:         * This class provides a framework for testing an implementation of MapIterator.
030:         * Concrete subclasses must provide the list iterator to be tested.
031:         * They must also specify certain details of how the list iterator operates by
032:         * overriding the supportsXxx() methods if necessary.
033:         * 
034:         * @since Commons Collections 3.0
035:         * @version $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
036:         * 
037:         * @author Stephen Colebourne
038:         */
039:        public abstract class AbstractTestMapIterator extends
040:                AbstractTestIterator {
041:
042:            /**
043:             * JUnit constructor.
044:             * 
045:             * @param testName  the test class name
046:             */
047:            public AbstractTestMapIterator(String testName) {
048:                super (testName);
049:            }
050:
051:            //-----------------------------------------------------------------------
052:            /**
053:             * Implement this method to return a map iterator over an empty map.
054:             * 
055:             * @return an empty iterator
056:             */
057:            public abstract MapIterator makeEmptyMapIterator();
058:
059:            /**
060:             * Implement this method to return a map iterator over a map with elements.
061:             * 
062:             * @return a full iterator
063:             */
064:            public abstract MapIterator makeFullMapIterator();
065:
066:            /**
067:             * Implement this method to return the map which contains the same data as the
068:             * iterator.
069:             * 
070:             * @return a full map which can be updated
071:             */
072:            public abstract Map getMap();
073:
074:            /**
075:             * Implement this method to return the confirmed map which contains the same
076:             * data as the iterator.
077:             * 
078:             * @return a full map which can be updated
079:             */
080:            public abstract Map getConfirmedMap();
081:
082:            /**
083:             * Implements the abstract superclass method to return the list iterator.
084:             * 
085:             * @return an empty iterator
086:             */
087:            public final Iterator makeEmptyIterator() {
088:                return makeEmptyMapIterator();
089:            }
090:
091:            /**
092:             * Implements the abstract superclass method to return the list iterator.
093:             * 
094:             * @return a full iterator
095:             */
096:            public final Iterator makeFullIterator() {
097:                return makeFullMapIterator();
098:            }
099:
100:            /**
101:             * Whether or not we are testing an iterator that supports setValue().
102:             * Default is true.
103:             * 
104:             * @return true if Iterator supports set
105:             */
106:            public boolean supportsSetValue() {
107:                return true;
108:            }
109:
110:            /**
111:             * Whether the get operation on the map structurally modifies the map,
112:             * such as with LRUMap. Default is false.
113:             * 
114:             * @return true if the get method structurally modifies the map
115:             */
116:            public boolean isGetStructuralModify() {
117:                return false;
118:            }
119:
120:            /**
121:             * The values to be used in the add and set tests.
122:             * Default is two strings.
123:             */
124:            public Object[] addSetValues() {
125:                return new Object[] { "A", "B" };
126:            }
127:
128:            //-----------------------------------------------------------------------
129:            /**
130:             * Test that the empty list iterator contract is correct.
131:             */
132:            public void testEmptyMapIterator() {
133:                if (supportsEmptyIterator() == false) {
134:                    return;
135:                }
136:
137:                MapIterator it = makeEmptyMapIterator();
138:                Map map = getMap();
139:                assertEquals(false, it.hasNext());
140:
141:                // next() should throw a NoSuchElementException
142:                try {
143:                    it.next();
144:                    fail();
145:                } catch (NoSuchElementException ex) {
146:                }
147:
148:                // getKey() should throw an IllegalStateException
149:                try {
150:                    it.getKey();
151:                    fail();
152:                } catch (IllegalStateException ex) {
153:                }
154:
155:                // getValue() should throw an IllegalStateException
156:                try {
157:                    it.getValue();
158:                    fail();
159:                } catch (IllegalStateException ex) {
160:                }
161:
162:                if (supportsSetValue() == false) {
163:                    // setValue() should throw an UnsupportedOperationException/IllegalStateException
164:                    try {
165:                        it.setValue(addSetValues()[0]);
166:                        fail();
167:                    } catch (UnsupportedOperationException ex) {
168:                    } catch (IllegalStateException ex) {
169:                    }
170:                } else {
171:                    // setValue() should throw an IllegalStateException
172:                    try {
173:                        it.setValue(addSetValues()[0]);
174:                        fail();
175:                    } catch (IllegalStateException ex) {
176:                    }
177:                }
178:            }
179:
180:            //-----------------------------------------------------------------------
181:            /**
182:             * Test that the full list iterator contract is correct.
183:             */
184:            public void testFullMapIterator() {
185:                if (supportsFullIterator() == false) {
186:                    return;
187:                }
188:
189:                MapIterator it = makeFullMapIterator();
190:                Map map = getMap();
191:                assertEquals(true, it.hasNext());
192:
193:                assertEquals(true, it.hasNext());
194:                Set set = new HashSet();
195:                while (it.hasNext()) {
196:                    // getKey
197:                    Object key = it.next();
198:                    assertSame("it.next() should equals getKey()", key, it
199:                            .getKey());
200:                    assertTrue("Key must be in map", map.containsKey(key));
201:                    assertTrue("Key must be unique", set.add(key));
202:
203:                    // getValue
204:                    Object value = it.getValue();
205:                    if (isGetStructuralModify() == false) {
206:                        assertSame("Value must be mapped to key", map.get(key),
207:                                value);
208:                    }
209:                    assertTrue("Value must be in map", map.containsValue(value));
210:
211:                    verify();
212:                }
213:            }
214:
215:            //-----------------------------------------------------------------------
216:            public void testMapIteratorSet() {
217:                if (supportsFullIterator() == false) {
218:                    return;
219:                }
220:
221:                Object newValue = addSetValues()[0];
222:                Object newValue2 = (addSetValues().length == 1 ? addSetValues()[0]
223:                        : addSetValues()[1]);
224:                MapIterator it = makeFullMapIterator();
225:                Map map = getMap();
226:                Map confirmed = getConfirmedMap();
227:                assertEquals(true, it.hasNext());
228:                Object key = it.next();
229:                Object value = it.getValue();
230:
231:                if (supportsSetValue() == false) {
232:                    try {
233:                        it.setValue(newValue);
234:                        fail();
235:                    } catch (UnsupportedOperationException ex) {
236:                    }
237:                    return;
238:                }
239:                Object old = it.setValue(newValue);
240:                confirmed.put(key, newValue);
241:                assertSame("Key must not change after setValue", key, it
242:                        .getKey());
243:                assertSame("Value must be changed after setValue", newValue, it
244:                        .getValue());
245:                assertSame("setValue must return old value", value, old);
246:                assertEquals("Map must contain key", true, map.containsKey(key));
247:                // test against confirmed, as map may contain value twice
248:                assertEquals("Map must not contain old value", confirmed
249:                        .containsValue(old), map.containsValue(old));
250:                assertEquals("Map must contain new value", true, map
251:                        .containsValue(newValue));
252:                verify();
253:
254:                it.setValue(newValue); // same value - should be OK
255:                confirmed.put(key, newValue);
256:                assertSame("Key must not change after setValue", key, it
257:                        .getKey());
258:                assertSame("Value must be changed after setValue", newValue, it
259:                        .getValue());
260:                verify();
261:
262:                it.setValue(newValue2); // new value
263:                confirmed.put(key, newValue2);
264:                assertSame("Key must not change after setValue", key, it
265:                        .getKey());
266:                assertSame("Value must be changed after setValue", newValue2,
267:                        it.getValue());
268:                verify();
269:            }
270:
271:            //-----------------------------------------------------------------------
272:            public void testRemove() { // override
273:                MapIterator it = makeFullMapIterator();
274:                Map map = getMap();
275:                Map confirmed = getConfirmedMap();
276:                assertEquals(true, it.hasNext());
277:                Object key = it.next();
278:
279:                if (supportsRemove() == false) {
280:                    try {
281:                        it.remove();
282:                        fail();
283:                    } catch (UnsupportedOperationException ex) {
284:                    }
285:                    return;
286:                }
287:
288:                it.remove();
289:                confirmed.remove(key);
290:                assertEquals(false, map.containsKey(key));
291:                verify();
292:
293:                try {
294:                    it.remove(); // second remove fails
295:                } catch (IllegalStateException ex) {
296:                }
297:                verify();
298:            }
299:
300:            //-----------------------------------------------------------------------
301:            public void testMapIteratorSetRemoveSet() {
302:                if (supportsSetValue() == false || supportsRemove() == false) {
303:                    return;
304:                }
305:                Object newValue = addSetValues()[0];
306:                MapIterator it = makeFullMapIterator();
307:                Map map = getMap();
308:                Map confirmed = getConfirmedMap();
309:
310:                assertEquals(true, it.hasNext());
311:                Object key = it.next();
312:
313:                it.setValue(newValue);
314:                it.remove();
315:                confirmed.remove(key);
316:                verify();
317:
318:                try {
319:                    it.setValue(newValue);
320:                    fail();
321:                } catch (IllegalStateException ex) {
322:                }
323:                verify();
324:            }
325:
326:            //-----------------------------------------------------------------------
327:            public void testMapIteratorRemoveGetKey() {
328:                if (supportsRemove() == false) {
329:                    return;
330:                }
331:                MapIterator it = makeFullMapIterator();
332:                Map map = getMap();
333:                Map confirmed = getConfirmedMap();
334:
335:                assertEquals(true, it.hasNext());
336:                Object key = it.next();
337:
338:                it.remove();
339:                confirmed.remove(key);
340:                verify();
341:
342:                try {
343:                    it.getKey();
344:                    fail();
345:                } catch (IllegalStateException ex) {
346:                }
347:                verify();
348:            }
349:
350:            //-----------------------------------------------------------------------
351:            public void testMapIteratorRemoveGetValue() {
352:                if (supportsRemove() == false) {
353:                    return;
354:                }
355:                MapIterator it = makeFullMapIterator();
356:                Map map = getMap();
357:                Map confirmed = getConfirmedMap();
358:
359:                assertEquals(true, it.hasNext());
360:                Object key = it.next();
361:
362:                it.remove();
363:                confirmed.remove(key);
364:                verify();
365:
366:                try {
367:                    it.getValue();
368:                    fail();
369:                } catch (IllegalStateException ex) {
370:                }
371:                verify();
372:            }
373:
374:        }
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