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/*******************************************************************************
* Copyright (c) 2007, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility;
import java.io.Serializable;
/**
* This interface allows clients to control how a command is executed.
* This is useful when the server provides the command but the client provides
* the context (e.g. the client would like to dispatch the command to the UI
* thread).
* <p>
* Provisional API: This interface is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*/
public interface CommandExecutor {
/**
* Execute the specified command.
*/
void execute(Command command);
/**
* Singleton implementation of the command executor interface
* that simply executes the command without any sort of enhancement.
*/
final class Default implements CommandExecutor, Serializable {
public static final CommandExecutor INSTANCE = new Default();
public static CommandExecutor instance() {
return INSTANCE;
}
// ensure single instance
private Default() {
super();
}
public void execute(Command command) {
command.execute();
}
@Override
public String toString() {
return "CommandExecutor.Default"; //$NON-NLS-1$
}
private static final long serialVersionUID = 1L;
private Object readResolve() {
// replace this object with the singleton
return INSTANCE;
}
}
}
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