001    /*
002     * Copyright 2002-2004 the original author or authors.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     * 
008     * http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package org.springframework.rules.closure;
017    
018    import org.springframework.rules.closure.Closure;
019    
020    /**
021     * A function object that tests two arguments and returns a single
022     * <code>boolean</code> result.
023     * <p><p>
024     * A binary closure is a function object that acts on two arguments. For
025     * example, the "Maximum" binary closure returns the maximum of two numbers.
026     * 
027     * @author Keith Donald
028     */
029    public interface BinaryClosure extends Closure {
030    
031        /**
032         * Executes this closure with the provided arguments.
033         * 
034         * @param argument1
035         *            the first argument
036         * @param argument2
037         *            the second argument
038         * @return The result of executing the closure
039         */
040        public Object call(Object argument1, Object argument2);
041    }