guava-tests/test/com/google/common/util/concurrent/FuturesTransformTest.java

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.util.concurrent;

import com.google.common.base.Function;

import java.lang.reflect.UndeclaredThrowableException;

/**
 * Unit tests for {@link Futures#transform(ListenableFuture, Function)}.
 *
 * @author Nishant Thakkar
 */
public class FuturesTransformTest
    extends AbstractChainedListenableFutureTest<String> {
  private static final String RESULT_DATA = "SUCCESS";

  @Override protected ListenableFuture<String> buildChainingFuture(
      ListenableFuture<Integer> inputFuture) {
    return Futures.transform(inputFuture,
        new ComposeFunction());
  }

  @Override protected String getSuccessfulResult() {
    return RESULT_DATA;
  }

  private class ComposeFunction
      implements Function<Integer, String> {
    @Override
    public String apply(Integer input) {
      if (input.intValue() == VALID_INPUT_DATA) {
        return RESULT_DATA;
      } else {
        throw new UndeclaredThrowableException(EXCEPTION);
      }
    }
  }

  public void testFutureGetThrowsFunctionException() throws Exception {
    inputFuture.set(EXCEPTION_DATA);
    listener.assertException(EXCEPTION);
  }
}