Opening fixed width files

An example of defining an OpenFileForReading event that opens a fixed width file so that each field is automatically parsed appears below. The additional data required by the Fixed Width codec is stored in the payload dictionary.

com.apama.file.OpenFileForReading openFixedFileRead :=
new com.apama.file.OpenFileForReading;

//matches transport in IAF instance
openFixedFileRead.transportName := JMultiFileTransport;

//the request id to use
openFixedFileRead.requestId := integer.getUnique();

//read using CSV Codec
openFixedFileRead.codec := "JFixedWidthCodec";

//file to read
openFixedFileRead.filename := "/usr/home/formby/stocktick.txt";
//additional data required to interpret fixed width data

//sequence of field lengths
openFixedFileRead.payload["fieldLengths"] := "[6,4,9,9,9]";

//it is left aligned
openFixedFileRead.payload["isLeftAligned"] := "true";

//the pad character
openFixedFileRead.payload["padCharacter"] := "_";

//emit event to channel in config.
emit openFixedFileRead to "FILE";

Subsequently, when the File adapter receives FileLine events, the adapter stores each field in the data sequence in order. You can access the ones you are interested in.