/**
* Copyright (C) 2015 Valkyrie RCP
*
* 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.valkyriercp.rules.closure.support;
/**
* Convenient super class for closures that encapsulate a block of executable
* code. Subclasses should override <code>void handle(Object)</code> for
* executing a block of code without a result.
*
* @author Keith Donald
*/
public abstract class Block extends AbstractClosure {
/**
* {@inheritDoc}
*
* @return allways <code>null</code>, only code is executed.
*/
public final Object call(Object argument) {
handle(argument);
return null;
}
/**
* Method to override in block subclasses that return no result: this method
* is intended encapsulate the block's processing.
*
* @param argument the argument to process
*/
protected abstract void handle(Object argument);
}