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/*******************************************************************************
* Copyright (c) 2007 Oracle Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Oracle - initial API and implementation
*
********************************************************************************/
package org.eclipse.jst.jsf.common.metadata.internal;
import org.eclipse.jst.jsf.common.metadata.Model;
/**
* Responsible for loading and holding onto the standard metadata model using the IDomainLoadingStrategy.
* Wraps the model (root) with the strategy used for loading it, along with the identifying key (modelKeyDescriptor)
*/
public class MetaDataModel {
private Object root;
private ModelKeyDescriptor modelKeyDescriptor;
private IDomainLoadingStrategy strategy;
private boolean refresh;
/**
* Constructor
* @param key
* @param strategy
*/
public MetaDataModel(ModelKeyDescriptor key, IDomainLoadingStrategy strategy){
this.modelKeyDescriptor = key;
this.strategy = strategy;
}
/**
* @return the root of the model.
*/
public Object getRoot(){
return root;
}
/**
* @param root
*/
public void setRoot(Object root){
this.root = root;
if (root != null)
((Model)root).setCurrentModelContext(modelKeyDescriptor);
}
/**
* @return ModelKeyDescriptor for this model
*/
public ModelKeyDescriptor getModelKey(){
return modelKeyDescriptor;
}
// public void accept(IEntityVisitor visitor){
// if (getRoot() instanceof Model)
// visitor.visit((Model)getRoot());
// }
/**
* @return true if the model is null or is not, in fact, a {@link Model}
*/
public boolean isEmpty() {
if (root == null || !(root instanceof Model))
return true;
return false;
}
/**
* Load the model. Delegates to the strategy.
*/
public void load(){
strategy.load(this);
}
/**
* Reloads the model delegating to strategy reload
* @throws ModelNotSetException
*/
public void reload()throws ModelNotSetException{
setRoot(null);
refresh = false;
strategy.reload();
}
/**
* @return flag indicating that the model is stale
*/
public boolean needsRefresh() {
return refresh;
}
/**
* Flag that model is stale
*/
public void setNeedsRefresh() {
refresh = true;
}
/**
* Cleans up the model releasing references.
*/
public void cleanup(){
if (strategy != null)
strategy.cleanup();
strategy = null;
root = null;
modelKeyDescriptor = null;
}
}
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