I agree, lets keep it immutable, then its safe to keep the expander around.
Two suggestions:
Your could provide a reusable expander:
Expander e = Expanders.outgoing().along(FRIEND).and(ENEMY);
for(Node n:e.expand(node)){
...
}
or a onetime expander:
for(Node n : node.expand().outgoing().along(FRIEND).and(ENEMY)){
...
}
OR
for(Node n : node.expand().outgoing().include(FRIEND).include(ENEMY)){
...
}
OR
for(Node n : node.expand().outgoing().with(FRIEND).with(ENEMY)){
...
}
-atle
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