1 /* 2 * Copyright (C) 2012 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.util.concurrent; 18 19 import com.google.common.base.Function; 20 import com.google.common.base.Throwables; 21 import com.google.common.collect.ForwardingObject; 22 import com.google.common.collect.Iterables; 23 import com.google.common.testing.ForwardingWrapperTester; 24 25 import org.easymock.EasyMock; 26 27 import java.lang.reflect.Method; 28 import java.util.Arrays; 29 30 /** 31 * Tester for typical subclass of {@link ForwardingObject} by using EasyMock partial mocks. 32 * 33 * @author Ben Yu 34 */ 35 final class ForwardingObjectTester { 36 37 private static final Method DELEGATE_METHOD; 38 static { 39 try { 40 DELEGATE_METHOD = ForwardingObject.class.getDeclaredMethod("delegate"); 41 DELEGATE_METHOD.setAccessible(true); 42 } catch (SecurityException e) { 43 throw new RuntimeException(e); 44 } catch (NoSuchMethodException e) { 45 throw new AssertionError(e); 46 } 47 } 48 49 /** 50 * Ensures that all interface methods of {@code forwarderClass} are forwarded to the 51 * {@link ForwardingObject#delegate}. {@code forwarderClass} is assumed to only implement one 52 * interface. 53 */ 54 static <T extends ForwardingObject> void testForwardingObject(final Class<T> forwarderClass) { 55 @SuppressWarnings("unchecked") // super interface type of T 56 Class<? super T> interfaceType = (Class<? super T>) 57 Iterables.getOnlyElement(Arrays.asList(forwarderClass.getInterfaces())); 58 new ForwardingWrapperTester().testForwarding(interfaceType, new Function<Object, T>() { 59 @Override public T apply(Object delegate) { 60 T mock = EasyMock.createMockBuilder(forwarderClass) 61 .addMockedMethod(DELEGATE_METHOD) 62 .createMock(); 63 try { 64 DELEGATE_METHOD.invoke(mock); 65 } catch (Exception e) { 66 throw Throwables.propagate(e); 67 } 68 EasyMock.expectLastCall().andStubReturn(delegate); 69 EasyMock.replay(mock); 70 return mock; 71 } 72 }); 73 } 74 } 75
