/**
* 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;
/**
* A function object that evaluates one argument, executing a block of code. It
* returns a single result.
* <p>
* A closure evaluates a single argument against some expression. For example, a
* "StringLength" closure might accept any object and return the length of the
* object's string form.
*
* @author Keith Donald
*/
public interface Closure {
/**
* Evaluate the function with the provided argument, returning the result.
*
* @param argument the argument
* @return the function return value
*/
Object call(Object argument);
}