001    // Copyright 2005 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.tapestry.form.validator;
016    
017    import org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.hivemind.util.Defense;
019    import org.apache.tapestry.IComponent;
020    
021    /**
022     * Implementation of {@link org.apache.tapestry.form.validator.Validator} that delegates to a
023     * managed bean obtained from a component.
024     * 
025     * @author Howard Lewis Ship
026     * @since 4.0
027     */
028    public class BeanValidatorWrapper extends AbstractValidatorWrapper
029    {
030        private final IComponent _component;
031    
032        private final String _name;
033    
034        public BeanValidatorWrapper(IComponent component, String name)
035        {
036            Defense.notNull(component, "component");
037            Defense.notNull(name, "name");
038    
039            _component = component;
040            _name = name;
041        }
042    
043        protected Validator getDelegate()
044        {
045            Object bean = _component.getBeans().getBean(_name);
046    
047            if (bean instanceof Validator)
048                return (Validator) bean;
049    
050            throw new ApplicationRuntimeException(ValidatorMessages.beanNotValidator(_name), bean,
051                    null, null);
052        }
053    
054    }