FileSort class

FileSort provides the ability to sort files based on their columns.

FileSort does a file based merge sort and as such can sort large files without regard to memory constraints. You will need free disk space equivalent to 2 times the size of the _inputPath file.

FileSort provides a range of sort comparators including: String - case sensitive and case insenstive Numeric Month

FileSort is used by the DCli example apps dsort.dart to re-implement the standard cli tool 'sort'.

Constructors

FileSort(String inputPath, String outputPath, List<Column> columns, String? fieldDelimiter, String? lineDelimiter, {bool? verbose = false})

Sort the file at inputPath and save the results to outputPath _inputPath is the path to the file to be sorted _outputPath is the path to write the sorted file to. _columns is used to describe the sort order to be applied to the selected columns. _fieldDelimiter is the delimiter to be used to separate each line of the file into columns. _lineDelimiter is the delimiter to be used to separate each line. verbose caused FileSort to log debug level information as it sorts.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

verbose → bool?

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

sort() → void

call this method to start the sort.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

expandColumns(List<String> values) → List<Column>

Expands an list of columns defined as per Column.parse into a list of Columns.