/** * 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); }