/*
* 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.version.undo;
import org.apache.wicket.Component;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.model.CompoundPropertyModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.lang.Classes;
import org.apache.wicket.util.lang.Objects;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An <code>IModel</code> change operation.
*
* @author Jonathan Locke
* @since 1.2.6
*/
class ModelChange extends Change
{
private static final long serialVersionUID = 1L;
/** logger */
private static final Logger log = LoggerFactory.getLogger(ModelChange.class);
/** the subject <code>Component</code> */
private final Component component;
/** the original <code>IModel</code> */
private IModel originalModel;
/**
* Constructor.
*
* @param component
* the subject <code>Component</code>
*/
ModelChange(final Component component)
{
if (component == null)
{
throw new IllegalArgumentException("argument component must be not null");
}
// Save component
this.component = component;
// Get component model
final IModel model = component.getModel();
// If the component has a model, it's about to change!
if (model != null)
{
// Should we clone the model?
boolean cloneModel = true;
// If the component is a form component
if (model instanceof CompoundPropertyModel)
{
if (component instanceof FormComponent)
{
// and it's using the same model as the form
if (((FormComponent)component).getForm().getModel() == model)
{
// we don't need to clone the model, because it will
// be re-initialized using initModel()
cloneModel = false;
}
}
else
{
// If the component is using the same model as the page
if (component.getPage().getModel() == model)
{
// we don't need to clone the model, because it will
// be re-initialized using initModel()
cloneModel = false;
}
}
}
// Clone model?
if (cloneModel)
{
model.detach();
originalModel = (IModel)Objects.cloneModel(model);
}
else
{
originalModel = model;
}
}
if (log.isDebugEnabled())
{
log.debug("RECORD MODEL CHANGE: changed model of " + " (" +
Classes.simpleName(component.getClass()) + "@" + component.hashCode() + ")");
}
}
/**
* @see org.apache.wicket.version.undo.Change#undo()
*/
public void undo()
{
if (log.isDebugEnabled())
{
log.debug("UNDO MODEL CHANGE: setting original model " + originalModel + " to " +
component.getPath() + "@" + component.hashCode() + ")");
}
component.setModel(originalModel);
}
/**
* @see java.lang.Object#toString()
*/
public String toString()
{
return "ModelChange[component: " + component.getPath() + "]";
}
}