Build project

mvn clean install

Run project

The directory samples contains various input files that can be used to generate data.

Generate data using a simple file and default parameters.

cat samples/input1.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator

Generate data using a simple file and specifying the total number of rows to.

cat samples/input1.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator 10

Generate data using a simple file and overriding the default properties.

cat samples/input1.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar -Ddgen.string.length=2 com.github.zabetak.datagenerator.Generator

Generate data using a file combining standard and custom column generators.

cat samples/input2.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator

Custom column generators

The generated values for a column can be fully controlled by using custom column generators. If the existing column generators are not sufficient for your needs you can create your own by implementing the ColumnGenerator interface. The following sub-sections outline a few useful custom generators with sample input and output.

EnumColumnGenerator

Config file

department custom com.github.zabetak.datagenerator.EnumColumnGenerator COMPUTER_SCIENCE MATH PHYSICS LITERATURE

Command

 cat samples/input3.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator 10

Output

LITERATURE
COMPUTER_SCIENCE
LITERATURE
PHYSICS
MATH
COMPUTER_SCIENCE
COMPUTER_SCIENCE
PHYSICS
MATH
MATH

FixedDigitColumnGenerator

Config file

postal_code custom com.github.zabetak.datagenerator.FixedDigitColumnGenerator 3 PO_78 _FR

Command

 cat samples/input4.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator 10

Output

PO_78232_FR
PO_78156_FR
PO_78584_FR
PO_78470_FR
PO_78523_FR
PO_78149_FR
PO_78129_FR
PO_78479_FR
PO_78716_FR
PO_78740_FR

SkewedIntColumnGenerator

Example with custom weights

Config file

integers custom com.github.zabetak.datagenerator.SkewedIntColumnGenerator 4 0.9 0.05 0.03 0.02

Command

 cat samples/input5.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator 10

Output

3232
3232
3232
2584
3232
3232
3232
2584
3232
3232

Example with default weights [0.8 0.1 0.05 0.03 0.02]

Config file

integers custom com.github.zabetak.datagenerator.SkewedIntColumnGenerator 4

Command

 cat samples/input5.txt | java -cp target/datagenerator-1.0-SNAPSHOT.jar com.github.zabetak.datagenerator.Generator 10

Output

3232
3232
3232
3232
8156
3232
3232
3232
3232
3232