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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.widget.AbstractValueModel;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.beans.PropertyEditor;
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import java.beans.PropertyEditorManager;
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import java.lang.reflect.InvocationTargetException;
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/**
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* A value model implementation which fetches and updates it's value according to the patterns of
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* the JavaBean specification, useful together with BeanModel.
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*
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* <!-- $Id: PropertyValueModel.java,v 1.4 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: 1.4 $
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*/
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class PropertyValueModel extends AbstractValueModel
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{
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private static final Log logger = LogFactory.getLog(PropertyValueModel.class);
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private Object bean;
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private BeanModel beanModel;
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private transient PropertyDescriptor property;
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/**
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* If the object can be null and created at a later stage use the {@link BeanModel} to create
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* a value model for a property.
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* @throws NullPointerException if object is <code>null</code>.
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*/
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public PropertyValueModel(Object object, String property)
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{
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this(object, findPropertyDescriptor(object.getClass(), property));
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}
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public PropertyValueModel(Object object, PropertyDescriptor property)
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{
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this.bean = object;
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this.property = property;
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}
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public PropertyValueModel(BeanModel proxy, String property)
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{
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this.beanModel = proxy;
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this.property = findPropertyDescriptor(proxy.getObjectClass(), property);
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}
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private static PropertyDescriptor findPropertyDescriptor(Class klass, String property)
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{
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PropertyDescriptor[] properties;
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try
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{
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properties = Introspector.getBeanInfo(klass).getPropertyDescriptors();
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}
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catch (IntrospectionException e)
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{
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throw new RuntimeException(e.getMessage());
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}
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PropertyDescriptor propertyDesc = null;
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for (int i = 0; i < properties.length; i++)
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{
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if (properties[i].getName().equals(property))
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{
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propertyDesc = properties[i];
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break;
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}
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}
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if (propertyDesc == null) throw new RuntimeException("No property " + property + " in bean of type " + klass.getName());
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return propertyDesc;
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}
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Object getBean()
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{
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Object bean = this.bean;
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if (bean == null) bean = beanModel.getBean();
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if (bean == null)
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{
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throw new IllegalStateException("Tried to access value of property with no valid value-bean.");
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}
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return bean;
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}
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public Object getValue()
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{
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try
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{
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return property.getReadMethod().invoke(getBean(), null);
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}
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catch (IllegalAccessException e)
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{
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throw new IllegalAccessError(e.getMessage());
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}
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catch (InvocationTargetException e)
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{
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// handle this better?
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throw new RuntimeException(e.getMessage());
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}
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}
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public boolean isReadOnly()
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{
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return property.getWriteMethod() == null || getPropertyEditor() == null;
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}
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public Class getValueClass()
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{
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return property.getPropertyType();
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}
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public void setValue(Object value)
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{
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if (isReadOnly()) throw new IllegalStateException("Trying to update a read-only property.");
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try
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{
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property.getWriteMethod().invoke(getBean(), new Object[]{value});
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changed();
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}
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catch (IllegalAccessException e)
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{
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throw new IllegalAccessError("Could not access property \"" + property.getName() + "\"." +
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"Note: If you are using inner classes as models they need to be public.");
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}
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catch (InvocationTargetException e)
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{
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// handle this better?
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throw new RuntimeException(e.getMessage());
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}
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}
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8
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public PropertyEditor getPropertyEditor()
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{
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PropertyEditor editor = null;
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Class editorClass = property.getPropertyEditorClass();
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if (editorClass != null)
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{
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try
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{
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editor = (PropertyEditor) editorClass.newInstance();
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}
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catch (InstantiationException ignore)
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{
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}
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catch (IllegalAccessException ignore)
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{
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}
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}
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if (editor == null)
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{
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editor = PropertyEditorManager.findEditor(getValueClass());
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}
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169
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8
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return editor;
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170
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}
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}
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