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.constraint;
017    
018    import java.util.Iterator;
019    
020    import org.springframework.rules.constraint.Constraint;
021    
022    /**
023     * A "and" compound constraint (aka conjunction).
024     * 
025     * @author Keith Donald
026     */
027    public class And extends CompoundConstraint {
028    
029            /**
030             * Creates a empty And conjunction.
031             */
032            public And() {
033                    super();
034            }
035    
036            /**
037             * "Ands" two constraints.
038             * 
039             * @param constraint1
040             *            The first constraint.
041             * @param constraint2
042             *            The second constraint.
043             */
044            public And(Constraint constraint1, Constraint constraint2) {
045                    super(constraint1, constraint2);
046            }
047    
048            /**
049             * "Ands" the specified constraints.
050             * 
051             * @param constraints
052             *            The constraints
053             */
054            public And(Constraint[] constraints) {
055                    super(constraints);
056            }
057    
058            /**
059             * Tests if all of the constraints aggregated by this compound constraint
060             * return <code>true</code> when evaulating this argument.
061             * 
062             * @see Constraint#test(java.lang.Object)
063             */
064            public boolean test(Object argument) {
065                    for (Iterator i = iterator(); i.hasNext();) {
066                            if (!((Constraint)i.next()).test(argument)) {
067                                    return false;
068                            }
069                    }
070                    return true;
071            }
072    }