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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.widget;
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/**
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* A ModelProxy acts as the proxy for JavaBean instances which may or may not actually
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* exist enabling them to be lazily evaluated only when a view actually requests the value
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* of the JavaBean. Useful when creating views which should be bound to properties of JavaBeans
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* but the view is not yet visible and the JavaBean is not yet instantiated. Also has a lot of
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* utility methods for creating various models bound to the JavaBean so it may be useful even if
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* the JavaBean actually exists. For this reason the name <code>ModelProxy</code> may be a little bit
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* inaccurate, maybe <code>JavaBeanModel</code> may be better.
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*
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* <!-- $Id: ModelProxy.java,v 1.3 2002/10/09 21:37:37 tirsen Exp $ -->
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*
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* @author $Author: tirsen $
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* @version $Revision: 1.3 $
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*/
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public class ModelProxy
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{
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private Object valueObject;
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private ValueModel model;
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private Class objectClass;
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public ModelProxy(Class objectClass)
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{
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this.objectClass = objectClass;
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}
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public ModelProxy(ValueModel model)
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{
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this.model = model;
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}
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public void setValueObject(Object valueObject)
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{
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this.valueObject = valueObject;
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}
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public Object getObject()
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{
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Object object = valueObject;
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if (object == null && model != null) object = model.getValue();
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return object;
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}
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public Class getObjectClass()
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{
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Class klass = objectClass;
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if (klass == null && valueObject != null) klass = valueObject.getClass();
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if (klass == null && model != null) klass = model.getValueClass();
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return klass;
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}
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public ValueModel getProperty(String property)
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{
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return new PropertyValueModel(this, property);
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}
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public ModelProxy getPropertyProxy(String property)
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{
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return new ModelProxy(getProperty(property));
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}
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}
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