Source Code Cross Referenced for ICUTestCase.java in  » Internationalization-Localization » icu4j » com » ibm » icu » tests » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.icu.tests 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *******************************************************************************
003:         * Copyright (C) 2006, International Business Machines Corporation and         *
004:         * others. All Rights Reserved.                                                *
005:         *******************************************************************************
006:         */
007:
008:        package com.ibm.icu.tests;
009:
010:        import java.io.ByteArrayInputStream;
011:        import java.io.ByteArrayOutputStream;
012:        import java.io.Externalizable;
013:        import java.io.IOException;
014:        import java.io.ObjectInputStream;
015:        import java.io.ObjectOutputStream;
016:        import java.io.Serializable;
017:        import java.lang.reflect.Array;
018:        import java.lang.reflect.InvocationTargetException;
019:        import java.lang.reflect.Method;
020:        import java.util.Locale;
021:
022:        import com.ibm.icu.util.TimeZone;
023:        import com.ibm.icu.util.ULocale;
024:
025:        import junit.framework.TestCase;
026:
027:        /**
028:         * Implement boilerplate tests.
029:         * Currently there is only one method, testEHCS, which tests equals, hashCode, 
030:         * clone, and serialization.
031:         */
032:        public abstract class ICUTestCase extends TestCase {
033:            private static final Object[] EMPTY_ARGS = {};
034:            private static final Class[] EMPTY_CLASSES = {};
035:
036:            private static final Locale oldLocale = Locale.getDefault();
037:            private static final ULocale oldULocale = ULocale.getDefault();
038:            private static final java.util.TimeZone oldJTimeZone = java.util.TimeZone
039:                    .getDefault();
040:            private static final TimeZone oldITimeZone = TimeZone.getDefault();
041:
042:            // TODO: what's the best way to check this?
043:            public static final boolean testingWrapper = true;
044:
045:            protected void setUp() throws Exception {
046:                super .setUp();
047:                Locale.setDefault(Locale.US);
048:                ULocale.setDefault(ULocale.US);
049:                java.util.TimeZone.setDefault(java.util.TimeZone
050:                        .getTimeZone("PST"));
051:                TimeZone.setDefault(TimeZone.getTimeZone("PST"));
052:            }
053:
054:            protected void tearDown() throws Exception {
055:                ULocale.setDefault(oldULocale);
056:                Locale.setDefault(oldLocale);
057:                TimeZone.setDefault(oldITimeZone);
058:                java.util.TimeZone.setDefault(oldJTimeZone);
059:                super .tearDown();
060:            }
061:
062:            private static final Object test = new Object();
063:
064:            /**
065:             * Assert that two objects are _not_ equal.  Curiously missing from Assert.
066:             * @param lhs an object to test, may be null
067:             * @param rhs an object to test, may be null
068:             */
069:            public static void assertNotEqual(Object lhs, Object rhs) {
070:                if (lhs == null) {
071:                    if (rhs == null)
072:                        fail("null equals null");
073:                } else {
074:                    if (lhs.equals(rhs)) {
075:                        fail(lhs.toString() + " equals " + rhs);
076:                    }
077:                }
078:            }
079:
080:            public static void assertNotEqual(long lhs, long rhs) {
081:                if (lhs == rhs) {
082:                    fail("values are equal: " + lhs);
083:                }
084:            }
085:
086:            /**
087:             * Test whether equality, hashCode, clone, and serialization work as expected.  
088:             * Equals(Object) is assumed to return false (not throw an exception) if passed 
089:             * null or an object of an incompatible class.
090:             * Hashcodes must be equal iff the two objects compare equal.  No attempt is made to
091:             * evaluate the quality of the hashcode distribution, so (in particular) degenerate 
092:             * hashcode implementations will pass this test.
093:             * Clone will be tested if the method "clone" is public on the class of obj.  
094:             * It is assumed to return an object that compares equal to obj.
095:             * Serialization will be tested if object implements Serializable or Externalizable.
096:             * It is assumed the serialized/deserialized object compares equal to obj.
097:             * @param obj the object to test
098:             * @param eq an object that should compare equal to, but is not the same as, obj.  
099:             *     it should be assignable to the class of obj.
100:             * @param neq a non-null object that should not compare equal to obj.  
101:             *     it should be assignable to the class of obj.
102:             */
103:            public static void testEHCS(Object obj, Object eq, Object neq) {
104:                if (obj == null || eq == null || neq == null) {
105:                    throw new NullPointerException();
106:                }
107:                Class cls = obj.getClass();
108:                if (!(cls.isAssignableFrom(eq.getClass()) && cls
109:                        .isAssignableFrom(neq.getClass()))) {
110:                    throw new IllegalArgumentException("unassignable classes");
111:                }
112:
113:                // reflexive
114:                assertEquals(obj, obj);
115:
116:                // should return false, not throw exception
117:                assertNotEqual(obj, test);
118:                assertNotEqual(obj, null);
119:
120:                // commutative
121:                assertEquals(obj, eq);
122:                assertEquals(eq, obj);
123:
124:                assertNotEqual(obj, neq);
125:                assertNotEqual(neq, obj);
126:
127:                // equal objects MUST have equal hashes, unequal objects MAY have equal hashes
128:                assertEquals(obj.hashCode(), eq.hashCode());
129:
130:                Object clone = null;
131:                try {
132:                    // look for public clone method and call it if available
133:                    Method method_clone = cls.getMethod("clone", EMPTY_CLASSES);
134:                    clone = method_clone.invoke(obj, EMPTY_ARGS);
135:                    assertNotNull(clone);
136:                } catch (NoSuchMethodException e) {
137:                    // ok
138:                } catch (InvocationTargetException e) {
139:                    // ok
140:                } catch (IllegalAccessException e) {
141:                    // ok
142:                }
143:
144:                if (clone != null) {
145:                    assertEquals(obj, clone);
146:                    assertEquals(clone, obj);
147:                }
148:
149:                if (obj instanceof  Serializable
150:                        || obj instanceof  Externalizable) {
151:                    Object ser = null;
152:                    try {
153:                        ByteArrayOutputStream bos = new ByteArrayOutputStream();
154:                        ObjectOutputStream oos = new ObjectOutputStream(bos);
155:                        oos.writeObject(clone);
156:                        oos.close();
157:
158:                        ByteArrayInputStream bis = new ByteArrayInputStream(bos
159:                                .toByteArray());
160:                        ObjectInputStream ois = new ObjectInputStream(bis);
161:                        ser = ois.readObject();
162:                        ois.close();
163:                    } catch (IOException e) {
164:                        System.err.println(e.getMessage());
165:                        throw new RuntimeException(e);
166:                    } catch (ClassNotFoundException e) {
167:                        System.err.println(e.getMessage());
168:                        throw new RuntimeException(e);
169:                    }
170:
171:                    if (ser != null) {
172:                        assertEquals(obj, ser);
173:                        assertEquals(ser, obj);
174:                        assertEquals(obj.hashCode(), ser.hashCode());
175:                    }
176:                }
177:            }
178:
179:            /**
180:             * Fail if the arrays are not equal.  To be equal, the arrays must
181:             * be the same length, and each element in the left array must compare
182:             * equal to the corresponding element of the right array.
183:             * Also fails if one of the objects is not an array.
184:             * @param lhs the left array
185:             * @param rhs the right array
186:             */
187:            public static void assertArraysEqual(Object lhs, Object rhs) {
188:                Class lcls = lhs.getClass();
189:                Class rcls = rhs.getClass();
190:                if (!(lcls.isArray() && rcls.isArray())) {
191:                    fail("objects are not arrays");
192:                }
193:                String result = arraysAreEqual(lhs, rhs);
194:                if (result != null) {
195:                    fail(result);
196:                }
197:            }
198:
199:            /**
200:             * Fail if the arrays are equal.  Also fails if one or the other 
201:             * argument is not an array.
202:             * @param lhs the left array
203:             * @param rhs the right array
204:             */
205:            public static void assertArraysNotEqual(Object lhs, Object rhs) {
206:                Class lcls = lhs.getClass();
207:                Class rcls = rhs.getClass();
208:                if (!(lcls.isArray() && rcls.isArray())) {
209:                    fail("objects are not arrays");
210:                }
211:                String result = arraysAreEqual(lhs, rhs);
212:                if (result == null) {
213:                    fail("arrays are equal");
214:                }
215:            }
216:
217:            // slow but general
218:            private static String arraysAreEqual(Object lhsa, Object rhsa) {
219:                int lhsl = Array.getLength(lhsa);
220:                int rhsl = Array.getLength(rhsa);
221:                if (lhsl != rhsl) {
222:                    return "length " + lhsl + " != " + rhsl;
223:                }
224:                boolean lhsaA = lhsa.getClass().getComponentType().isArray();
225:                boolean rhsaA = rhsa.getClass().getComponentType().isArray();
226:                if (lhsaA != rhsaA) {
227:                    return (lhsaA ? "" : "non-") + "array != "
228:                            + (rhsaA ? "" : "non-") + "array";
229:                }
230:                for (int i = 0; i < lhsl; ++i) {
231:                    Object lhse = Array.get(lhsa, i);
232:                    Object rhse = Array.get(rhsa, i);
233:                    if (lhse == null) {
234:                        if (rhse != null) {
235:                            return "null != " + rhse;
236:                        }
237:                    } else {
238:                        if (lhsaA) {
239:                            String result = arraysAreEqual(lhse, rhse);
240:                            if (result != null) {
241:                                if (result.charAt(0) != '[') {
242:                                    result = " " + result;
243:                                }
244:                                return "[" + i + "]" + result;
245:                            }
246:                        } else {
247:                            if (!lhse.equals(rhse)) {
248:                                return lhse.toString() + " != " + rhse;
249:                            }
250:                        }
251:                    }
252:                }
253:                return null;
254:            }
255:
256:            // much more painful and slow than it should be... partly because of the
257:            // oddness of clone, partly because arrays don't provide a Method for 
258:            // 'clone' despite the fact that they implement it and make it public.
259:            public static Object cloneComplex(Object obj) {
260:                Object result = null;
261:                if (obj != null) {
262:                    Class cls = obj.getClass();
263:                    if (cls.isArray()) {
264:                        int len = Array.getLength(obj);
265:                        Class typ = cls.getComponentType();
266:                        result = Array.newInstance(typ, len);
267:                        boolean prim = typ.isPrimitive();
268:                        for (int i = 0; i < len; ++i) {
269:                            Object elem = Array.get(obj, i);
270:                            Array.set(result, i, prim ? elem
271:                                    : cloneComplex(elem));
272:                        }
273:                    } else {
274:                        result = obj; // default
275:                        try {
276:                            Method cloneM = cls.getMethod("clone", null);
277:                            result = cloneM.invoke(obj, null);
278:                        } catch (NoSuchMethodException e) {
279:                        } catch (IllegalAccessException e) {
280:                        } catch (InvocationTargetException e) {
281:                        }
282:                    }
283:                }
284:                return result;
285:            }
286:        }
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