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fixed null pointer in ListIteratingSystem #35

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fixed null pointer in ListIteratingSystem #35

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46 changes: 25 additions & 21 deletions src/ash/tools/ListIteratingSystem.as
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
package ash.tools
{

import ash.core.Engine;
import ash.core.Node;
import ash.core.NodeList;
Expand All @@ -10,7 +11,7 @@ package ash.tools
* class removes the need for a lot of boilerplate code in such systems. Extend this class and pass the node type and
* a node update method into the constructor. The node update method will be called once per node on the update cycle
* with the node instance and the frame time as parameters. e.g.
*
*
* <code>package
* {
* public class MySystem extends ListIteratingSystem
Expand All @@ -29,55 +30,58 @@ package ash.tools
*/
public class ListIteratingSystem extends System
{
protected var nodeList : NodeList;
protected var nodeClass : Class;
protected var nodeUpdateFunction : Function;
protected var nodeAddedFunction : Function;
protected var nodeRemovedFunction : Function;
public function ListIteratingSystem( nodeClass : Class, nodeUpdateFunction : Function, nodeAddedFunction : Function = null, nodeRemovedFunction : Function = null )
protected var nodeList:NodeList;
protected var nodeClass:Class;
protected var nodeUpdateFunction:Function;
protected var nodeAddedFunction:Function;
protected var nodeRemovedFunction:Function;

public function ListIteratingSystem( nodeClass:Class, nodeUpdateFunction:Function = null, nodeAddedFunction:Function = null, nodeRemovedFunction:Function = null )
{
this.nodeClass = nodeClass;
this.nodeUpdateFunction = nodeUpdateFunction;
this.nodeAddedFunction = nodeAddedFunction;
this.nodeRemovedFunction = nodeRemovedFunction;
}
override public function addToEngine( engine : Engine ) : void

override public function addToEngine( engine:Engine ):void
{
nodeList = engine.getNodeList( nodeClass );
if( nodeAddedFunction != null )
if (nodeAddedFunction != null)
{
for( var node : Node = nodeList.head; node; node = node.next )
for (var node:Node = nodeList.head; node; node = node.next)
{
nodeAddedFunction( node );
}
nodeList.nodeAdded.add( nodeAddedFunction );
}
if( nodeRemovedFunction != null )
if (nodeRemovedFunction != null)
{
nodeList.nodeRemoved.add( nodeRemovedFunction );
}
}
override public function removeFromEngine( engine : Engine ) : void

override public function removeFromEngine( engine:Engine ):void
{
if( nodeAddedFunction != null )
if (nodeAddedFunction != null)
{
nodeList.nodeAdded.remove( nodeAddedFunction );
}
if( nodeRemovedFunction != null )
if (nodeRemovedFunction != null)
{
nodeList.nodeRemoved.remove( nodeRemovedFunction );
}
nodeList = null;
}
override public function update( time : Number ) : void

override public function update( time:Number ):void
{
for( var node : Node = nodeList.head; node; node = node.next )
if (nodeUpdateFunction != null)
{
nodeUpdateFunction( node, time );
for (var node:Node = nodeList.head; node; node = node.next)
{
nodeUpdateFunction( node, time );
}
}
}
}
Expand Down