Parsing Map<Enum,Obj> - 501

[TheDoctorOne]

Related to issue #501.

Parsing "Map<Enum,Obj>" where enum's toString method is overridden and not returning the original name of the constant.
Test code and backtrace of the issue: #501 (comment)

With the added implementation, it first checks for name, as it was doing before. And if the result does not match with any constant that Enum has, it also checks for the output of the "toString()" method and returns the result of it.

[Marcono1234]

Relates to #1920, which is (partially) about toString() being used for map keys during serialization.

[Chaostical]

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[TheDoctorOne]

Resolved the conflict caused by the variable name change from "field" to "constantField"

[eamonnmcmanus]

This seems reasonable. Just a small quibble about style.

[Marcono1234]

Might be good to add a test for this, for example similar to what you have shown in #501 (comment).
Possibly also verifying that constant names have higher precedence, e.g.:

enum SwitchedToString {
  A("B"),
  B("A");

  private final String toString;

  SwitchedToString(String toString) {
    this.toString = toString;
  }

  @Override
  public String toString() {
    return toString;
  }
}

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Note that I am not a member of this project so feel free to consider this only as suggestion.

[TheDoctorOne]

Didn't know that, thx for the heads up

[eamonnmcmanus]

Thanks! I've run this change against the tests for all of Google's internal code and I didn't find any problems.