[REEF-1876] Support enums in named parameters in Tang.

Summary of changes:
   * Add support for simple Java enums in named parameters in Tang. Invoke a static method `.valueOf(String)` of the corresponding enum to instantiate an object, if necessary.
   * Add unit tests to check the new functionality for explicit and default enum parameters.

JIRA:
  [REEF-1876](https://issues.apache.org/jira/browse/REEF-1876)

Pull request:
  This closes #1370
2 files changed
tree: 042092803cad4e5a85c5b2f1a6447751cdf51117
  1. bin/
  2. dev/
  3. lang/
  4. website/
  5. .gitattributes
  6. .gitignore
  7. .travis.yml
  8. appveyor.yml
  9. Doxyfile
  10. HEADER
  11. LICENSE
  12. NOTICE
  13. pom.xml
  14. README.md
README.md

Apache REEF™

Apache REEF™ (Retainable Evaluator Execution Framework) is a library for developing portable applications for cluster resource managers such as Apache Hadoop YARN or Apache Mesos. For example, Microsoft Azure Stream Analytics is built on REEF and Hadoop.

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Detailed information on REEF can be found in the following places:

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