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.property;
017    
018    import org.springframework.binding.PropertyAccessStrategy;
019    import org.springframework.rules.constraint.Required;
020    
021    /**
022     * Predicate that tests if the specified bean property is "present" - that is,
023     * passes the "Required" test.
024     *
025     * @author Keith Donald
026     * @see Required
027     */
028    public class PropertyPresent extends AbstractPropertyConstraint {
029    
030            /**
031             * Constructs a property present predicate for the specified property.
032             *
033             * @param propertyName
034             *            The bean property name.
035             */
036            public PropertyPresent(String propertyName) {
037                    super(propertyName);
038            }
039    
040            protected boolean test(PropertyAccessStrategy domainObjectAccessStrategy) {
041                    return Required.instance().test(domainObjectAccessStrategy.getPropertyValue(getPropertyName()));
042            }
043    
044            public String toString() {
045                    return "required if '" + getPropertyName() + "' present";
046            }
047    
048    }