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
015package org.apache.tapestry.form.validator;
016
017import org.apache.hivemind.ApplicationRuntimeException;
018import org.apache.hivemind.util.Defense;
019import 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 */
028public 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}