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