001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.bean.validation;
018
019import org.apache.wicket.WicketRuntimeException;
020import org.apache.wicket.markup.html.form.FormComponent;
021import org.apache.wicket.model.IPropertyReflectionAwareModel;
022import org.apache.wicket.model.PropertyModel;
023
024import java.lang.reflect.Field;
025import java.lang.reflect.Method;
026import java.util.Locale;
027
028/**
029 * Default property resolver. This resolver supports common Wicket models like the
030 * {@link PropertyModel}, and other implementations of {@link IPropertyReflectionAwareModel}
031 * 
032 * @author igor
033 * 
034 */
035public class DefaultPropertyResolver implements IPropertyResolver
036{
037
038        @Override
039        public Property resolveProperty(FormComponent<?> component)
040        {
041                IPropertyReflectionAwareModel<?> delegate = ValidationModelResolver.resolvePropertyModelFrom(component);
042                if (delegate == null)
043                {
044                        return null;
045                }
046                
047                String name;
048                Method getter = delegate.getPropertyGetter();
049                if (getter != null)
050                {
051                        String methodName = getter.getName();
052                        if (methodName.startsWith("get"))
053                        {
054                                name = methodName.substring(3, 4).toLowerCase(Locale.ROOT) +
055                                        methodName.substring(4);
056                        }
057                        else if (methodName.startsWith("is"))
058                        {
059                                name = methodName.substring(2, 3).toLowerCase(Locale.ROOT) +
060                                                methodName.substring(3);
061                        }
062                        else
063                        {
064                                throw new WicketRuntimeException("Invalid name for a getter method: '"
065                                                + methodName + "'. It must start either with 'get' or 'is'.");
066                        }
067                        return new Property(getter.getDeclaringClass(), name);
068                }
069
070                Field field = delegate.getPropertyField();
071                if (field != null)
072                {
073                        return new Property(field.getDeclaringClass(), field.getName());
074                }
075
076                return null;
077        }
078
079}