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/*
* Copyright (c) OSGi Alliance (2017). 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 org.osgi.util.promise;
import static java.util.Objects.requireNonNull;
import java.lang.reflect.InvocationTargetException;
/**
* Failed Promise implementation.
* <p>
* This class is not used directly by clients. Clients should use
* {@link PromiseFactory#failed(Throwable)} to create a failed {@link Promise}.
*
* @param <T> The result type associated with the Promise.
* @since 1.1
* @ThreadSafe
* @author $Id$
*/
final class FailedPromiseImpl<T> extends PromiseImpl<T> {
/**
* The failure of this failed Promise.
*/
private final Throwable fail;
/**
* Initialize this failed Promise.
*
* @param fail The failure of this failed Promise. Must not be {@code null}.
* @param factory The factory to use for callbacks and scheduled operations.
*/
FailedPromiseImpl(Throwable fail, PromiseFactory factory) {
super(factory);
this.fail = requireNonNull(fail);
}
/**
* {@inheritDoc}
*/
@Override
public boolean isDone() {
return true;
}
/**
* {@inheritDoc}
*/
@Override
public T getValue() throws InvocationTargetException {
throw new InvocationTargetException(fail);
}
/**
* {@inheritDoc}
*/
@Override
public Throwable getFailure() {
return fail;
}
/**
* Return a holder of the result of this PromiseImpl.
*/
@Override
Result<T> collect() {
return new Result<T>(fail);
}
@Override
public String toString() {
return super.toString() + "[failed: " + fail + "]";
}
}
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