Improve DFS/BFS visit states
----------------------------
Key: SANDBOX-416
URL: https://issues.apache.org/jira/browse/SANDBOX-416
Project: Commons Sandbox
Issue Type: Improvement
Components: Graph
Reporter: Simone Tripodi
Assignee: Simone Tripodi
As discussed in
[ML|http://mail-archives.apache.org/mod_mbox/commons-dev/201203.mbox/%3CCAAqLGLOhZYC8qvT4TLugsnqCgw9BQ-%2BkYoGXVrKASy7PDZdeoQ%40mail.gmail.com%3E],
{{org.apache.commons.graph.visit.GraphVisitHandler}} methods that return
{{boolean}} flags can be sometimes not so intuitive.
The proposal is replacing {{boolean}} flags return statements with an
enumeration values {{ABORT}}, {{CONTINUE}}, {{SKIP}} to identify
* visit has to be immediately terminated
* visit can continue;
* current node children visit can be skipped.
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