RetainOperator

RetainOperator retains the first occurrence of a field, without changing the header.

RetainOperator is intended for fields where the value is expected to be the same for all occurrences of the unique key, and the goal is to pass the value through unchanged. It is like FirstOperator, except that the original header is preserved. The original header preservation is setup in the call to the SingleFieldOperation constructor.

Notes: - An option to signal an error if multiple values are encountered might be useful.

class RetainOperator : SingleFieldOperator {

this(size_t fieldIndex, MissingFieldPolicy missingPolicy);

SingleFieldCalculator makeCalculator();

class RetainCalculator;

}

Constructors

this this(size_t fieldIndex, MissingFieldPolicy missingPolicy): Undocumented in source.

Members

Classes

RetainCalculator class RetainCalculator: Undocumented in source.

Functions

makeCalculator SingleFieldCalculator makeCalculator(): Undocumented in source. Be warned that the author may not have intended to support it.

Inherited Members

From SingleFieldOperator

setCustomHeader void setCustomHeader(string customHeader): Undocumented in source. Be warned that the author may not have intended to support it.
name string name(): Undocumented in source. Be warned that the author may not have intended to support it.
allowCustomHeader bool allowCustomHeader(): Undocumented in source. Be warned that the author may not have intended to support it.
setSaveFieldValuesNumeric void setSaveFieldValuesNumeric(): Undocumented in source. Be warned that the author may not have intended to support it.
setSaveFieldValuesText void setSaveFieldValuesText(): Undocumented in source. Be warned that the author may not have intended to support it.
missingPolicy MissingFieldPolicy missingPolicy(): Undocumented in source. Be warned that the author may not have intended to support it.
fieldIndex size_t fieldIndex(): Undocumented in source. Be warned that the author may not have intended to support it.
header string header(): Undocumented in source. Be warned that the author may not have intended to support it.
useHeaderSuffix bool useHeaderSuffix(): Undocumented in source. Be warned that the author may not have intended to support it.
processHeaderLine void processHeaderLine(char[][] fields): Undocumented in source. Be warned that the author may not have intended to support it.
numericFieldsToSave size_t[] numericFieldsToSave(): Undocumented in source. Be warned that the author may not have intended to support it.
textFieldsToSave size_t[] textFieldsToSave(): Undocumented in source. Be warned that the author may not have intended to support it.
makeCalculator SingleFieldCalculator makeCalculator(): Undocumented in source.