11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2007 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * you may not use this file except in compliance with the License. 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * You may obtain a copy of the License at 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * distributed under the License is distributed on an "AS IS" BASIS, 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See the License for the specific language governing permissions and 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * limitations under the License. 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.collect; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.base.Function; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.base.Joiner; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 220888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport junit.framework.TestCase; 230888a09821a98ac0680fad765217302858e70fa4Paul Duffin 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.reflect.Array; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.reflect.InvocationHandler; 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.reflect.InvocationTargetException; 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.reflect.Method; 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.reflect.Proxy; 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.ArrayList; 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Arrays; 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Collection; 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Collections; 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Iterator; 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.List; 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Set; 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Base test case for testing the variety of forwarding classes. 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Robert Konigsberg 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Louis Wasserman 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic abstract class ForwardingTestCase extends TestCase { 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 457dd252788645e940eada959bdde927426e2531c9Paul Duffin private final List<String> calls = new ArrayList<String>(); 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private void called(String id) { 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert calls.add(id); 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert protected String getCalls() { 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return calls.toString(); 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert protected boolean isCalled() { 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return !calls.isEmpty(); 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @SuppressWarnings("unchecked") 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert protected <T> T createProxyInstance(Class<T> c) { 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /* 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * This invocation handler only registers that a method was called, 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * and then returns a bogus, but acceptable, value. 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert InvocationHandler handler = new InvocationHandler() { 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public Object invoke(Object proxy, Method method, Object[] args) 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throws Throwable { 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert called(asString(method)); 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return getDefaultValue(method.getReturnType()); 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }; 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (T) Proxy.newProxyInstance(c.getClassLoader(), 761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert new Class[] { c }, handler); 771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final Joiner COMMA_JOINER = Joiner.on(","); 801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /* 821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns string representation of a method. 831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * If the method takes no parameters, it returns the name (e.g. 851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * "isEmpty". If the method takes parameters, it returns the simple names 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * of the parameters (e.g. "put(Object,Object)".) 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private String asString(Method method) { 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert String methodName = method.getName(); 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Class<?>[] parameterTypes = method.getParameterTypes(); 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (parameterTypes.length == 0) { 931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return methodName; 941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Iterable<String> parameterNames = Iterables.transform( 971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Arrays.asList(parameterTypes), 981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert new Function<Class<?>, String>() { 991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 1001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public String apply(Class<?> from) { 1011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return from.getSimpleName(); 1021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }); 1041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return methodName + "(" + COMMA_JOINER.join(parameterNames) + ")"; 1051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static Object getDefaultValue(Class<?> returnType) { 1081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (returnType == boolean.class || returnType == Boolean.class) { 1091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return Boolean.FALSE; 1101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else if (returnType == int.class || returnType == Integer.class) { 1111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return 0; 1121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else if ((returnType == Set.class) || (returnType == Collection.class)) { 1131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return Collections.emptySet(); 1140888a09821a98ac0680fad765217302858e70fa4Paul Duffin } else if (returnType == Iterator.class) { 1151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return Iterators.emptyModifiableIterator(); 1161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else if (returnType.isArray()) { 1171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return Array.newInstance(returnType.getComponentType(), 0); 1181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else { 1191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 1201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert protected static <T> void callAllPublicMethods(Class<T> theClass, T object) 1241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throws InvocationTargetException { 1251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (Method method : theClass.getMethods()) { 1261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Class<?>[] parameterTypes = method.getParameterTypes(); 1271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Object[] parameters = new Object[parameterTypes.length]; 1281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int i = 0; i < parameterTypes.length; i++) { 1291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert parameters[i] = getDefaultValue(parameterTypes[i]); 1301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 1321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 1331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert method.invoke(object, parameters); 1341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } catch (InvocationTargetException ex) { 1351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 1361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throw ex.getCause(); 1371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } catch (UnsupportedOperationException unsupported) { 1381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // this is a legit exception 1391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } catch (Throwable cause) { 1421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throw new InvocationTargetException(cause, 1430888a09821a98ac0680fad765217302858e70fa4Paul Duffin method + " with args: " + Arrays.toString(parameters)); 1441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 148