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//
// $Id$
//
// Narya library - tools for developing networked games
// Copyright (C) 2002-2012 Three Rings Design, Inc., All Rights Reserved
// http://code.google.com/p/narya/
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package com.threerings.presents.dobj {
import com.threerings.io.ObjectInputStream;
import com.threerings.io.ObjectOutputStream;
import com.threerings.util.Boxed;
import com.threerings.util.Joiner;
/**
* An attribute changed event is dispatched when a single attribute of a
* distributed object has changed. It can also be constructed to request
* an attribute change on an object and posted to the dobjmgr.
*
* @see DObjectManager#postEvent
*/
public class AttributeChangedEvent extends NamedEvent
{
/**
* Returns the new value of the attribute.
*/
public function getValue () :Object
{
return _value;
}
/**
* Returns the value of the attribute prior to the application of this
* event.
*/
public function getOldValue () :Object
{
return _oldValue;
}
/**
* Applies this attribute change to the object.
*/
override public function applyToObject (target :DObject) :Boolean
//throws ObjectAccessException
{
// if we have no old value, that means we're not running on the
// master server and we have not already applied this attribute
// change to the object, so we must grab the previous value and
// actually apply the attribute change
if (_oldValue === UNSET_OLD_ENTRY) {
_oldValue = target[_name]; // fucking wack-ass language
}
target[_name] = _value;
return true;
}
/**
* Constructs a new attribute changed event on the specified target
* object with the supplied attribute name and value. <em>Do not
* construct these objects by hand.</em> Use {@link
* DObject#changeAttribute} instead.
*
* @param targetOid the object id of the object whose attribute has
* changed.
* @param name the name of the attribute (data member) that has
* changed.
* @param value the new value of the attribute (in the case of
* primitive types, the reflection-defined object-alternative is
* used).
*/
public function AttributeChangedEvent (
targetOid :int = 0, name :String = null, value :Object = null,
oldValue :Object = null)
{
super(targetOid, name);
// only init these values if they were specified
if (arguments.length > 0) {
_value = value;
_oldValue = oldValue;
}
}
// documentation inherited
override protected function notifyListener (listener :Object) :void
{
if (listener is AttributeChangeListener) {
(listener as AttributeChangeListener).attributeChanged(this);
}
}
// documentation inherited
override protected function toStringJoiner (j :Joiner) :void
{
super.toStringJoiner(j);
j.add("value", _value);
}
override public function writeObject (out :ObjectOutputStream) :void
{
super.writeObject(out);
out.writeObject(_value);
}
override public function readObject (ins :ObjectInputStream) :void
{
super.readObject(ins);
_value = ins.readObject();
// possibly convert the value
if (_value is Boxed) {
_value = (_value as Boxed).unbox();
}
}
protected var _value :Object;
protected var _oldValue :Object = UNSET_OLD_ENTRY;
}
}
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