/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.model;
import org.apache.wicket.Component;
import org.apache.wicket.core.util.lang.PropertyResolver;
/**
* A model that references a property by name on the current model of the component it is bound to.
* This enables direct usage of inherited models such as compound property models.
*
* @author Jonathan Locke
*
* @param <T>
* The Model object
*/
public class ComponentPropertyModel<T> implements IComponentAssignedModel<T>
{
private static final long serialVersionUID = 1L;
/** Name of property to read */
private final String propertyName;
/**
* Constructor
*
* @param propertyName
* The name of the property to reference
*/
public ComponentPropertyModel(final String propertyName)
{
this.propertyName = propertyName;
}
@Override
public T getObject()
{
throw new IllegalStateException("Wrapper should have been called");
}
@Override
public final void setObject(T object)
{
IComponentAssignedModel.super.setObject(object);
}
@Override
public IWrapModel<T> wrapOnAssignment(final Component component)
{
return new AssignmentWrapper<T>(component, propertyName);
}
/**
* Wrapper used when assigning a ComponentPropertyModel to a component.
*
* @param <P>
* The Model Object
*/
private class AssignmentWrapper<P> implements IWrapModel<P>
{
private static final long serialVersionUID = 1L;
private final Component component;
private final String propertyName;
AssignmentWrapper(final Component component, final String propertyName)
{
this.component = component;
this.propertyName = propertyName;
}
@Override
public IModel<T> getWrappedModel()
{
return ComponentPropertyModel.this;
}
protected String propertyExpression()
{
return propertyName;
}
@SuppressWarnings("unchecked")
@Override
public P getObject()
{
return (P)PropertyResolver.getValue(propertyName, component.getParent()
.getInnermostModel()
.getObject());
}
@Override
public void detach()
{
ComponentPropertyModel.this.detach();
}
}
}