use enums for error code
------------------------
Key: PIG-1611
URL: https://issues.apache.org/jira/browse/PIG-1611
Project: Pig
Issue Type: Sub-task
Reporter: Thejas M Nair
Fix For: 0.9.0
Pig code is using integer constants for error code, and the value of the error
code is reserved using
http://wiki.apache.org/pig/PigErrorHandlingFunctionalSpecification .
This process is cumbersome and error prone.
It will be better to use enum values instead. The enum value can contain the
error message and encapsulate the error code.
For example -
{code}
Replace
throw new SchemaMergeException("Error in merging schema", 2124,
PigException.BUG);
with
throw new SchemaMergeException(SCHEMA_MERGE_EX, PigException.BUG);
{code}
Where SCHEMA_MERGE_EX belongs to a error codes enum. We can use the ordinal
value of the enum and an offset to determine the error code.
The error code will be passed through the constructor of the enum.
{code}
SCHEMA_MERGE_EX("Error in merging schema");
{code}
For documentation, the error code and error messages can be dumped using code
that uses the enum error code class.
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