com.phloc.commons.callback.AdapterRunnableToCallable Maven / Gradle / Ivy
/**
* Copyright (C) 2006-2015 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* 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.phloc.commons.callback;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import com.phloc.commons.ValueEnforcer;
import com.phloc.commons.string.ToStringGenerator;
/**
* A helper class that converts a {@link Runnable} into an
* {@link INonThrowingCallable}.
*
* @author Philip Helger
* @param
* The callable result type.
*/
@Immutable
public class AdapterRunnableToCallable implements INonThrowingCallable
{
private final Runnable m_aRunnable;
private final DATATYPE m_aResult;
public AdapterRunnableToCallable (@Nonnull final Runnable aRunnable)
{
this (aRunnable, null);
}
public AdapterRunnableToCallable (@Nonnull final Runnable aRunnable, @Nullable final DATATYPE aResult)
{
m_aRunnable = ValueEnforcer.notNull (aRunnable, "Runnable");
m_aResult = aResult;
}
@Nullable
public DATATYPE call ()
{
m_aRunnable.run ();
return m_aResult;
}
@Override
public String toString ()
{
return new ToStringGenerator (this).append ("runnable", m_aRunnable).append ("result", m_aResult).toString ();
}
/**
* Create a callable that always returns null.
*
* @param aRunnable
* The runnable to be executed.
* @return The created {@link AdapterRunnableToCallable} object.
*/
@Nonnull
public static AdapterRunnableToCallable