Package guru.mikelue.jdut.datagrain

Class DataGrain

java.lang.Object

guru.mikelue.jdut.datagrain.DataGrain

public class DataGrain
extends Object

Represents the data of rows.

Defining data grains

The simplest by to build a data grain is using build(java.util.function.Consumer<guru.mikelue.jdut.datagrain.SchemaTable.Builder>, java.util.function.Consumer<guru.mikelue.jdut.datagrain.RowsBuilder>) method:

 DataGrain dataGrain = DataGrain.build(
     tableBuilder -> tableBuilder
         .name("tab_name_1"),
     rowsBuilder -> rowsBuilder
         .implicitColumns("col_id", "col_value")
         .addValues(1, "v_1")
         .addValues(2, "v_2")
 );
 

Combining data grains

The data grains could be combines(sequentially) by aggregate(guru.mikelue.jdut.datagrain.DataGrain) method.

 // dataGrain - Initialized object of DataGrain
 // nextDataGrain - The next data grain
 dataGrain = dataGrain.aggregate(nextDataGrain);
 

Decoration

You may decorates data grain by DataGrainDecorator.

 // dataGrain - Initialized object of DataGrain
 // myDecorator - Your decorator

 dataGrain = dataGrain.decorate(myDecorator)
 

See Also:

DataGrainDecorator, API Guideline

Constructor Summary

Constructors

Constructor	Description
DataGrain(List<DataRow> rows)	Constructs this object by list of rows.

Method Summary

Modifier and Type	Method	Description
DataGrain	aggregate(DataGrain dataGrain)	Aggregates another data grain(appending data of current object).
static DataGrain	build(Consumer<SchemaTable.Builder> tableBuilderConsumer, Consumer<RowsBuilder> rowsBuilderConsumer)	Builds with setup of table schema and builder of rows.
DataGrain	decorate(DataGrainDecorator decorator)	Decorators this data grain and generates a new one.
int	getNumberOfRows()	Gets number of rows.
DataRow	getRow(int index)	Gets a row by index(starts with "0").
List<DataRow>	getRows()	Gets data of rows.
DataGrain	reverse()	Reverses the data grain.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DataGrain

public DataGrain(List<DataRow> rows)

Constructs this object by list of rows.

Parameters:

rows - The data of rows

Method Detail

build

public static DataGrain build(Consumer<SchemaTable.Builder> tableBuilderConsumer,
                              Consumer<RowsBuilder> rowsBuilderConsumer)

Builds with setup of table schema and builder of rows.

Parameters:

tableBuilderConsumer - The builder for table schema

rowsBuilderConsumer - The builder for data of rows

Returns:

DataGrain object

getRow

public DataRow getRow(int index)

Gets a row by index(starts with "0").

Parameters:

index - The index of row, starts with "0"

Returns:

The match data row

See Also:

getNumberOfRows()

getNumberOfRows

public int getNumberOfRows()

Gets number of rows.

Returns:

The number of rows

See Also:

getRows()

getRows

public List<DataRow> getRows()

Gets data of rows.

Returns:

The data of rows

decorate

public DataGrain decorate(DataGrainDecorator decorator)

Decorators this data grain and generates a new one.

Parameters:

decorator - The decorator to modify this data grain

Returns:

The new data grain

aggregate

public DataGrain aggregate(DataGrain dataGrain)

Aggregates another data grain(appending data of current object).

Parameters:

dataGrain - The data grain to be aggregated

Returns:

The result data grain

reverse

public DataGrain reverse()

Reverses the data grain.

Returns:

A new data grain which is reversed(same row of copied data grain)