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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.beans;
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import com.tirsen.angkor.event.ChangeListener;
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import com.tirsen.angkor.event.ChangeSource;
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import com.tirsen.angkor.event.ChangeSourceHelper;
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import com.tirsen.angkor.widget.ValueModel;
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import java.io.Serializable;
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/**
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* A JavaBeanModel 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>JavaBeanModel</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: JavaBeanModel.java,v 1.2 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: 1.2 $
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*/
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public class JavaBeanModel implements Serializable, ChangeSource
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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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private ChangeSourceHelper changeSourceHelper = new ChangeSourceHelper(this);
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public JavaBeanModel(Class objectClass)
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{
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this.objectClass = objectClass;
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}
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public JavaBeanModel(ValueModel model)
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{
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this.model = model;
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}
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public JavaBeanModel(Object valueObject)
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{
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setValueObject(valueObject);
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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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changeSourceHelper.signalChangeEvent();
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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 getValue(String expression)
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{
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return new PropertyValueModel(this, expression);
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}
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public JavaBeanModel getJavaBean(String expression)
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{
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return new JavaBeanModel(getValue(expression));
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}
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public void addChangeListener(ChangeListener listener)
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{
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changeSourceHelper.addChangeListener(listener);
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}
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public void removeChangeListener(ChangeListener listener)
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{
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changeSourceHelper.removeChangeListener(listener);
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}
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}
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