com.google.errorprone.bugpatterns.testdata.FutureReturnValueIgnoredPositiveCases.java Source code

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/*
 * Copyright 2012 Google Inc. All Rights Reserved.
 *
 * 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.errorprone.bugpatterns.testdata;

import static com.google.common.util.concurrent.Futures.immediateFuture;

import com.google.common.base.Function;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.Future;

/** @author eaftan@google.com (Eddie Aftandilian) */
public class FutureReturnValueIgnoredPositiveCases {

    IntValue intValue = new IntValue(0);

    private Future<Integer> increment(int bar) {
        return null;
    }

    public <T extends Future> T returnFutureType(T input) {
        return input;
    }

    public void testFutureGenerics() {
        // BUG: Diagnostic contains: Future must be checked
        returnFutureType(Futures.immediateCancelledFuture());
    }

    public void foo() {
        int i = 1;
        // BUG: Diagnostic contains: Future must be checked
        increment(i);
        System.out.println(i);
    }

    public void bar() {
        // BUG: Diagnostic contains: Future must be checked
        this.intValue.increment();
    }

    public void testIntValue() {
        IntValue value = new IntValue(10);
        // BUG: Diagnostic contains: Future must be checked
        value.increment();
    }

    public void testFunction() {
        new Function<Object, ListenableFuture<?>>() {
            @Override
            public ListenableFuture<?> apply(Object input) {
                return immediateFuture(null);
            }
            // BUG: Diagnostic contains: Future must be checked
        }.apply(null);
    }

    private class IntValue {

        final int i;

        public IntValue(int i) {
            this.i = i;
        }

        public ListenableFuture<IntValue> increment() {
            return immediateFuture(new IntValue(i + 1));
        }

        public void increment2() {
            // BUG: Diagnostic contains: Future must be checked
            this.increment();
        }

        public void increment3() {
            // BUG: Diagnostic contains: Future must be checked
            increment();
        }
    }
}