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/** Return an iterator over the edges coming into the given node. * @param node The node. * @return A NullIterator, since no edges are attached to attributes. */ public Iterator inEdges(Object node) { return new NullIterator(); }
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/** Return an iterator over the edges coming out of the given node. * @param node The node. * @return A NullIterator, since no edges are attached to attributes. */ public Iterator outEdges(Object node) { return new NullIterator(); }
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* this graph model. * @return An iterator of Arc objects, all of which have * the given node as their head. */ public Iterator inEdges(Object node) { return new NullIterator(); }
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* this graph model. * @return An iterator of Arc objects, all of which have * the given node as their tail. */ public Iterator outEdges(Object node) { return new NullIterator(); }
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* does not necessarily support removal operations. * In this base class, this returns an iterator over * nothing. */ public Iterator nodesAfterEdges(Object composite) { return (new NullIterator()); }