diff options
Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/Command.java')
-rw-r--r-- | jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/Command.java | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/Command.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/Command.java deleted file mode 100644 index 5d1941dc35..0000000000 --- a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/Command.java +++ /dev/null @@ -1,87 +0,0 @@ -/******************************************************************************* - * 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.utility; - -import java.io.Serializable; - -/** - * Simple interface for implementing the GOF Command design pattern, - * and it doesn't carry the baggage of {@link java.lang.Runnable}. - * <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 Command { - - /** - * Execute the command. The semantics of the command - * is determined by the contract between the client and server. - */ - void execute(); - - /** - * Singleton implementation of the command interface that will do nothing - * when executed. - */ - final class Null implements Command, Serializable { - public static final Command INSTANCE = new Null(); - public static Command instance() { - return INSTANCE; - } - // ensure single instance - private Null() { - super(); - } - public void execute() { - // do nothing - } - @Override - public String toString() { - return "Command.Null"; //$NON-NLS-1$ - } - private static final long serialVersionUID = 1L; - private Object readResolve() { - // replace this object with the singleton - return INSTANCE; - } - } - - /** - * Singleton implementation of the command interface that will throw an - * exception when executed. - */ - final class Disabled implements Command, Serializable { - public static final Command INSTANCE = new Disabled(); - public static Command instance() { - return INSTANCE; - } - // ensure single instance - private Disabled() { - super(); - } - // throw an exception - public void execute() { - throw new UnsupportedOperationException(); - } - @Override - public String toString() { - return "Command.Disabled"; //$NON-NLS-1$ - } - private static final long serialVersionUID = 1L; - private Object readResolve() { - // replace this object with the singleton - return INSTANCE; - } - } - -} |