Logic Flowcharts › PreSORT Processing

PreSORT Processing

If there is a SORT statement, CA JARS Wizard performs the following steps:

• Reads a record from the input file at the end of the file, and passes control to the SORT.
• Any CALL(I) statements are processed.
• Evaluates any COMPUTE(S) statements.
• Reset evaluates the SELECT(P) and REJECT(P) statements, and also the SELECT and REJECT statements that physically appear in the job stream ahead of the CALL(P), COMPUTE(P), and DECODE(P) statements.

  If the SELECT conditions are met and the REJECT conditions are not met, the record is processed further.

• If there are no SELECT or REJECT statements at this point, all of the records are processed further.
• The selected and nonrejected records are processed by executing the CALL(P), DECODE(P), and COMPUTE(P) statements.

  There can be multiple specifications for each of these control statements. All the statements that are of the same function execute the series of instructions as if they were one statement. The strung statements execute in the chronological order in which they appear in the input job stream.

  New fields generated as a result of these statements are appended to the input record. For example, if a COMPUTE(P) statement is executed and generates a 4-byte binary result called CTR, the input record length is extended by 4 bytes, and the last four bytes are accessed at any time, by reference to the field name CTR.

  Thus, all newly created fields at this point can be used as operands in succeeding statements.

• Evaluates the SELECT and REJECT statements that physically appear in the input job stream after the CALL(P), COMPUTE(P), and DECODE(P) statements.

  If the SELECT conditions are met and the REJECT conditions are not met, the record is processed further.

  If there are no SELECT or REJECT statements at this point, all of the records are processed further.

• The selected and nonrejected records are passed on to the SORT.
• At the end of the file, control is passed to the SORT program.