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
006     * of 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
014     * under the License.
015     */
016    package org.springframework.rules.constraint;
017    
018    import org.springframework.rules.closure.BinaryConstraint;
019    import org.springframework.util.Assert;
020    
021    public abstract class AbstractBinaryConstraint extends ConstraintsAccessor implements BinaryConstraint {
022            public boolean test(Object argument1) {
023                    if (argument1 == null) {
024                            argument1 = new Object[0];
025                    }
026                    Assert.isTrue(argument1.getClass().isArray(), "Binary argument must be an array");
027                    Object[] arguments = (Object[])argument1;
028                    Assert.isTrue(arguments.length == 2, "Binary argument must contain 2 elements");
029                    return test(arguments[0], arguments[1]);
030            }
031    }