1 /* 2 * Copyright (C) 2008 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 21 import java.lang.reflect.UndeclaredThrowableException; 22 23 /** 24 * Unit tests for {@link Futures#transform(ListenableFuture, Function)}. 25 * 26 * @author Nishant Thakkar 27 */ 28 public class FuturesTransformTest 29 extends AbstractChainedListenableFutureTest<String> { 30 private static final String RESULT_DATA = "SUCCESS"; 31 buildChainingFuture( ListenableFuture<Integer> inputFuture)32 @Override protected ListenableFuture<String> buildChainingFuture( 33 ListenableFuture<Integer> inputFuture) { 34 return Futures.transform(inputFuture, 35 new ComposeFunction()); 36 } 37 getSuccessfulResult()38 @Override protected String getSuccessfulResult() { 39 return RESULT_DATA; 40 } 41 42 private class ComposeFunction 43 implements Function<Integer, String> { 44 @Override apply(Integer input)45 public String apply(Integer input) { 46 if (input.intValue() == VALID_INPUT_DATA) { 47 return RESULT_DATA; 48 } else { 49 throw new UndeclaredThrowableException(EXCEPTION); 50 } 51 } 52 } 53 testFutureGetThrowsFunctionException()54 public void testFutureGetThrowsFunctionException() throws Exception { 55 inputFuture.set(EXCEPTION_DATA); 56 listener.assertException(EXCEPTION); 57 } 58 } 59