001    // Copyright 2007, 2010 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.services;
016    
017    import java.util.List;
018    
019    import org.apache.tapestry5.ioc.AnnotationProvider;
020    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
021    import org.apache.tapestry5.services.ValidationConstraintGenerator;
022    
023    @SuppressWarnings("all")
024    public class ValidationConstraintGeneratorImpl implements ValidationConstraintGenerator
025    {
026        private final List<ValidationConstraintGenerator> configuration;
027    
028        public ValidationConstraintGeneratorImpl(final List<ValidationConstraintGenerator> configuration)
029        {
030            this.configuration = configuration;
031        }
032    
033        public List<String> buildConstraints(Class propertyType, AnnotationProvider annotationProvider)
034        {
035            assert propertyType != null;
036            assert annotationProvider != null;
037            List<String> result = CollectionFactory.newList();
038    
039            for (ValidationConstraintGenerator g : configuration)
040            {
041                List<String> constraints = g.buildConstraints(propertyType, annotationProvider);
042    
043                if (constraints != null)
044                    result.addAll(constraints);
045            }
046    
047            // TODO: How to handle duplicate or conflicting constraints from different generators?
048    
049            return result;
050        }
051    }