001    // Copyright 2007 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.beaneditor;
016    
017    import org.apache.tapestry5.ioc.AnnotationProvider;
018    import org.apache.tapestry5.services.ValidationConstraintGenerator;
019    
020    import java.util.Arrays;
021    import java.util.List;
022    
023    /**
024     * Adds a "required" constraint for any property of whose type is a primitive (not a wrapper or reference) type.
025     */
026    public class PrimitiveFieldConstraintGenerator implements ValidationConstraintGenerator
027    {
028        private final List<String> REQUIRED = Arrays.asList("required");
029    
030        public List<String> buildConstraints(Class propertyType, AnnotationProvider annotationProvider)
031        {
032            return propertyType.isPrimitive() ? REQUIRED : null;
033        }
034    
035    }