Sequence generation

Case: Substitution of fields with content.

Status: ACTIVE

SUBSTITUTION=(#4,ORDNO.#3), KEYS((#3,ORDNO.#1),(#4,ORDNO.#2)), NFA(GEN_NEW_SEQNUM)

Field #3 is Item String (char)

Field #4 is order number (Long)

these are used to generate unique order numbers.

There can be no empty lines in the ORDNO file.

If the file ORDNO contains orders such as:

INSIDE;1;1;

INSIDE;2;7;

PEN/GOLD;1;5;

It looks like:

INSIDE;1;1;

INSIDE;2;7;

PEN/GOLD;1;5;

TOP/GOLD;900003;8;       <<

The next generated order number has been chosen that is maximum the existing order number plus 1.

Case: Creation

When a Record finds a SUBSTITUTION Token, it will call up the static Substitution::ReadSubstitution function for this Record.

Parsed keys result in the creation of a new FileDefColl by calling the FileDef for the file. FileDef::CreateColl is parsed as a BaseFileData pointer for the correct/expected type. In addition information about the index number (the position of the column), the FileDef::CreateColl returns a pointer to the newly created FileDefColl. It is then stored in a new vector arKeys.

A new Substitution (,y, ? ) is then created.

Case: Read

When a Record has conducted a Read / FetchData it calls for the record substitutions one by one.

Each substitution will prompt the primary record for a value and perform a hash calculation. The hash calculation is used to access the primary Key Map for the primary Keys relevant indexes. They are accessed one at the time and the primary key is matched to the primary Record Entry. The primary record entry BaseFileData performs this and comparisons/matches are conducted polymorphically. If a match is found the substitution prompt the next keys/FileDefColl for the entry with the same index and the record entry performs the matching, etc.

If a match is found for the substitution, then it extracts the substitution value from the FileDefColl and call on the BaseFileData to substitute/update this value.

Case: Read with NFA Skip

If a match is not found, then the substitution does not do anything.

Case: Read with NFA Sequence Generation

If a match is not found, then the substitution will react by generating a new sequence number.

The Substitution also asks the FileDef to add a new line, by appending a new entry to each FileDefColl it has, default is a dummy holding a string. It then generates the new sequence entry / number by asking the FileDefColl.

FileDefColl prompts the BaseFileData to create a new DataEntry of the correct type. This is placed in the last entry of the FileDefColl, (the one just added by FileDef)

Substitution also asks each of the keys (for example, FileDefColl) to replace the last added index.

Case: Write

The Record is called to perform the write data method.

The Record will have each BaseFileData retrieve the data from the global data in M3 PWB. This data is stored in the associated Data Entry.

The substitution is run. If a substitution is found, then this will replace the record Entry with the replacement value. This is done by locating the primary key from prime Key Map, searching for a match on the primary key and checking all other keys for match. This process continues until a match is found or until there are no additional prime Keys with a hash key.

Case: Write with NFA Skip

Entries not found are ignored.

Case: Write with NFA Sequence Generation

Should always find a substitution.