/*******************************************************************************
* Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.utility;
/**
* Simple interface for implementing the GOF Command design pattern.
*/
public interface Command {
/**
* Execute the command. The semantics of the command
* is determined by the contract between the client and server.
*/
void execute();
Command NULL_INSTANCE =
new Command() {
public void execute() {
// do nothing
}
public String toString() {
return "NullCommand";
}
};
}