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4.1 Java Status Codes

Function: boolean err_P (int x) ¶

Return x if a valid error code (-1 … MAXERR); else 0.

Function: boolean success_P (int x) ¶

Not err_P.

Variable: int success ¶

Successful execution (0).

Negative integers are used for errors according to increasingly severity, as follows:

Variable: int notpres ¶

Successful execution; no data present or no change made.

Variable: int terminated ¶

Failure; no damage; caller can retry operation.

Variable: int retryerr ¶

Failure; no damage; caller can retry operation.

Variable: int keyerr ¶

Failure, no damage, call was in error.

Variable: int argerr ¶

Failure, no damage, call was in error.

Variable: int noroom ¶

Failure, no damage, out of room in file.

Variable: int typerr ¶

Failure, file or object was not of correct type.

Variable: int ioerr ¶

I/O error, DB may be damaged.

Variable: int strangerr ¶

Internal error, DB may be damaged.

Variable: int unkerr ¶

Placeholder code.

Variable: int maxerr ¶

All error codes are between 0 and ‘maxerr’.