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.bean;
016
017import org.apache.hivemind.util.Defense;
018import org.apache.hivemind.util.PropertyUtils;
019import org.apache.tapestry.IBeanProvider;
020import org.apache.tapestry.IBinding;
021import org.apache.tapestry.IComponent;
022import org.apache.tapestry.binding.BindingConstants;
023import org.apache.tapestry.binding.BindingSource;
024
025/**
026 * An {@link org.apache.tapestry.bean.IBeanInitializer} implementation that uses an
027 * {@link org.apache.tapestry.IBinding} to obtain the value which will be assigned to the bean
028 * property.
029 * 
030 * @author Howard M. Lewis Ship
031 * @since 4.0
032 */
033public class BindingBeanInitializer extends AbstractBeanInitializer
034{
035    private BindingSource _bindingSource;
036
037    private String _bindingReference;
038
039    /** @since 4.0 */
040    public BindingBeanInitializer(BindingSource source)
041    {
042        Defense.notNull(source, "source");
043
044        _bindingSource = source;
045    }
046
047    /**
048     * @since 4.0
049     */
050    public void setBindingReference(String bindingReference)
051    {
052        _bindingReference = bindingReference;
053    }
054
055    /** @since 4.0 */
056    public String getBindingReference()
057    {
058        return _bindingReference;
059    }
060
061    public void setBeanProperty(IBeanProvider provider, Object bean)
062    {
063        IComponent component = provider.getComponent();
064
065        String description = BeanMessages.propertyInitializerName(_propertyName);
066
067        IBinding binding = _bindingSource.createBinding(
068                component,
069                description,
070                _bindingReference,
071                BindingConstants.OGNL_PREFIX,
072                getLocation());
073
074        Class propertyType = PropertyUtils.getPropertyType(bean, _propertyName);
075
076        Object bindingValue = binding.getObject(propertyType);
077
078        setBeanProperty(bean, bindingValue);
079    }
080}