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import java.util.Vector;
/**
* The node type for the AccessibleTreeModel.
* This implements all the child-handling based on the appropriate
* NodeHandlers. Trivial nodes can be implemented by any Object
* type.
*/
class AccTreeNode
{
private Vector aHandlers; /// NodeHandlers for this node
private Object aDataObject; /// the actual data object
private Object aDisplayObject; /// object to be displayed
public AccTreeNode( Object aData )
{
this( aData, aData );
}
public AccTreeNode( Object aData, Object aDisplay )
{
aHandlers = new Vector();
aDataObject = aData;
aDisplayObject = aDisplay;
}
public Object getDataObject() { return aDataObject; }
public Object getDisplayObject() { return aDisplayObject; }
public void addHandler( NodeHandler aHandler )
{
aHandlers.add( aHandler );
}
/** iterate over handlers and return child sum */
public int getChildCount()
{
int nRet = 0;
for(int i = 0; i < aHandlers.size(); i++)
{
nRet += ((NodeHandler)aHandlers.get(i)).
getChildCount( aDataObject );
}
return nRet;
}
/** iterate over handlers until the child is found */
public Object getChild(int nIndex)
{
if( nIndex >= 0 )
{
for(int i = 0; i < aHandlers.size(); i++)
{
// check if this handler has the child, and if not
// search with next handler
NodeHandler aHandler = (NodeHandler)aHandlers.get(i);
int nCount = aHandler.getChildCount( aDataObject );
if( nCount > nIndex )
return aHandler.getChild( aDataObject, nIndex );
else
nIndex -= nCount;
}
}
// nothing found?
return null;
}
/** this node is a leaf if have no handlers, or is those
handlers show no children */
public boolean isLeaf()
{
return (aHandlers.size() == 0) || (getChildCount() == 0);
}
public boolean equals(Object aOther)
{
return (this == aOther) || aDataObject.equals( aOther );
}
public String toString()
{
return aDisplayObject.toString();
}
}
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