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.constraint.Constraint;
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 constraint is a function object that tests two arguments against
025     * some conditional expression. For example, a "GreaterThan" constraint will
026     * return true if the first argument is greater than the second.
027     * 
028     * @author Keith Donald
029     */
030    public interface BinaryConstraint extends Constraint {
031    
032        /**
033         * Test the provided arguments against this predicates conditional
034         * expression.
035         * 
036         * @param argument1
037         *            the first argument
038         * @param argument2
039         *            the second argument
040         * @return true if the condition was satisfied, false otherwise
041         */
042        public boolean test(Object argument1, Object argument2);
043    }