001    /*
002     * Copyright 2002-2004 the original author or authors.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy 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,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.springframework.rules.constraint;
017    
018    import org.springframework.rules.constraint.Constraint;
019    import org.springframework.rules.reporting.TypeResolvable;
020    import org.springframework.util.Assert;
021    
022    public class IfTrue extends AbstractConstraint implements TypeResolvable{
023    
024            private Constraint constraint;
025    
026            private Constraint mustBeTrueConstraint;
027    
028            private Constraint elseTrueConstraint;
029    
030            private String type;
031            
032            public IfTrue(Constraint constraint, Constraint mustAlsoBeTrue) {
033                    this(constraint, mustAlsoBeTrue, (Constraint)null);
034            }
035            
036            public IfTrue(Constraint constraint, Constraint mustAlsoBeTrue, String type) {
037                    this(constraint, mustAlsoBeTrue, null, type);
038            }
039    
040            public IfTrue(Constraint constraint, Constraint mustAlsoBeTrue, Constraint elseMustAlsoBeTrue) {
041                    this(constraint, mustAlsoBeTrue, elseMustAlsoBeTrue, "ifTrue");
042            }
043            
044            public IfTrue(Constraint constraint, Constraint mustAlsoBeTrue, Constraint elseMustAlsoBeTrue, String type) {
045                    Assert.notNull(constraint, "The constraint that may be true is required");
046                    Assert.notNull(mustAlsoBeTrue, "The constraint that must be true IF the first constraint is true is required");
047                    this.constraint = constraint;
048                    this.mustBeTrueConstraint = mustAlsoBeTrue;
049                    this.elseTrueConstraint = elseMustAlsoBeTrue;
050                    this.type = type;
051            }
052    
053            public boolean test(Object argument) {
054                    if (constraint.test(argument))
055                            return mustBeTrueConstraint.test(argument);
056    
057                    if (elseTrueConstraint != null)
058                            return elseTrueConstraint.test(argument);
059    
060            return true;
061            }
062    
063            public String getType() {
064                    return type;
065            }
066    }