/// <summary>
/// Using the Introspector class the method returns the property descriptors obtained through introspection.
/// </summary>
/// <param name="clazz">to introspect</param>
/// <returns>array of property descriptors</returns>
protected internal static PropertyDescriptor[] Introspect(Type clazz) {
BeanInfo beanInfo;
try {
beanInfo = Introspector.GetBeanInfo(clazz);
} catch (IntrospectionException e) {
return new PropertyDescriptor[0];
}
return beanInfo.PropertyDescriptors;
}
private static PropertyDescriptor GetPropertyDescriptor(Class type, String property)
{
try
{
foreach (PropertyDescriptor pd in Introspector.GetBeanInfo(type).PropertyDescriptors)
{
if (property.Equals(pd.Name))
{
return(pd);
}
}
}
catch (IntrospectionException)
{
}
return(null);
}
// Write out the properties of this instance.
private void InitBean(Class type, Object oldInstance, Object newInstance, Encoder @out)
{
foreach (Field field in type.Fields)
{
if (!ReflectUtil.isPackageAccessible(field.DeclaringClass))
{
continue;
}
int mod = field.Modifiers;
if (Modifier.IsFinal(mod) || Modifier.IsStatic(mod) || Modifier.IsTransient(mod))
{
continue;
}
try
{
Expression oldGetExp = new Expression(field, "get", new Object[] { oldInstance });
Expression newGetExp = new Expression(field, "get", new Object[] { newInstance });
Object oldValue = oldGetExp.Value;
Object newValue = newGetExp.Value;
@out.WriteExpression(oldGetExp);
if (!Objects.Equals(newValue, @out.Get(oldValue)))
{
@out.WriteStatement(new Statement(field, "set", new Object[] { oldInstance, oldValue }));
}
}
catch (Exception exception)
{
@out.ExceptionListener.ExceptionThrown(exception);
}
}
BeanInfo info;
try
{
info = Introspector.GetBeanInfo(type);
}
catch (IntrospectionException)
{
return;
}
// Properties
foreach (PropertyDescriptor d in info.PropertyDescriptors)
{
if (d.IsTransient())
{
continue;
}
try
{
DoProperty(type, d, oldInstance, newInstance, @out);
}
catch (Exception e)
{
@out.ExceptionListener.ExceptionThrown(e);
}
}
// Listeners
/*
* Pending(milne). There is a general problem with the archival of
* listeners which is unresolved as of 1.4. Many of the methods
* which install one object inside another (typically "add" methods
* or setters) automatically install a listener on the "child" object
* so that its "parent" may respond to changes that are made to it.
* For example the JTable:setModel() method automatically adds a
* TableModelListener (the JTable itself in this case) to the supplied
* table model.
*
* We do not need to explicitly add these listeners to the model in an
* archive as they will be added automatically by, in the above case,
* the JTable's "setModel" method. In some cases, we must specifically
* avoid trying to do this since the listener may be an inner class
* that cannot be instantiated using public API.
*
* No general mechanism currently
* exists for differentiating between these kind of listeners and
* those which were added explicitly by the user. A mechanism must
* be created to provide a general means to differentiate these
* special cases so as to provide reliable persistence of listeners
* for the general case.
*/
if (!type.IsSubclassOf(typeof(java.awt.Component)))
{
return; // Just handle the listeners of Components for now.
}
foreach (EventSetDescriptor d in info.EventSetDescriptors)
{
if (d.IsTransient())
{
continue;
}
Class listenerType = d.ListenerType;
// The ComponentListener is added automatically, when
// Contatiner:add is called on the parent.
if (listenerType == typeof([email protected]))
{
continue;
}
// JMenuItems have a change listener added to them in
// their "add" methods to enable accessibility support -
// see the add method in JMenuItem for details. We cannot
// instantiate this instance as it is a private inner class
// and do not need to do this anyway since it will be created
// and installed by the "add" method. Special case this for now,
// ignoring all change listeners on JMenuItems.
if (listenerType == typeof([email protected]) && type == typeof(javax.swing.JMenuItem))
{
continue;
}
EventListener[] oldL = new EventListener[0];
EventListener[] newL = new EventListener[0];
try
{
Method m = d.GetListenerMethod;
oldL = (EventListener[])MethodUtil.invoke(m, oldInstance, new Object[] {});
newL = (EventListener[])MethodUtil.invoke(m, newInstance, new Object[] {});
}
catch (Exception)
{
try
{
Method m = type.GetMethod("getListeners", new Class[] { typeof(Class) });
oldL = (EventListener[])MethodUtil.invoke(m, oldInstance, new Object[] { listenerType });
newL = (EventListener[])MethodUtil.invoke(m, newInstance, new Object[] { listenerType });
}
catch (Exception)
{
return;
}
}
// Asssume the listeners are in the same order and that there are no gaps.
// Eventually, this may need to do true differencing.
String addListenerMethodName = d.AddListenerMethod.Name;
for (int i = newL.Length; i < oldL.Length; i++)
{
// System.out.println("Adding listener: " + addListenerMethodName + oldL[i]);
InvokeStatement(oldInstance, addListenerMethodName, new Object[] { oldL[i] }, @out);
}
String removeListenerMethodName = d.RemoveListenerMethod.Name;
for (int i = oldL.Length; i < newL.Length; i++)
{
InvokeStatement(oldInstance, removeListenerMethodName, new Object[] { newL[i] }, @out);
}
}
}
