com.illumon.iris.db.v2

Class TreeTableOrphanPromoter

java.lang.Object

com.illumon.iris.db.v2.TreeTableOrphanPromoter

All Implemented Interfaces:

com.fishlib.base.Function.Unary<Table,Table>

public class TreeTableOrphanPromoter
extends Object
implements com.fishlib.base.Function.Unary<Table,Table>

Identify orphan rows in a table destined for conversion into a tree table, and mask their parent column value to null, so that they show up at the top level of the hierarchy.

This is useful if your data contains values which you can not identify as top-level rows; or if you would like to filter your tree table source, excluding parents which do not meet your filter criteria, but do not want to orphan the matches.

This class should be used by calling TreeTableOrphanPromoter.promoteOrphans(Table, String, String) method.

Method Summary

Modifier and Type	Method and Description
Table	call(Table table)
static Table	promoteOrphans(Table table, String idColumn, String parentColumn) Convert a table with orphans to one without.

Methods inherited from class java.lang.Object

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

Method Detail

call

public Table call(Table table)

Specified by:

call in interface com.fishlib.base.Function.Unary<Table,Table>

promoteOrphans

public static Table promoteOrphans(Table table,
                                   String idColumn,
                                   String parentColumn)

Convert a table with orphans to one without.

Parameters:

table - the input table to operate on

idColumn - the column containing each row's unique ID

parentColumn - the column containing the parent for this row; null for top-level rows

Returns:

a table where parentColumn is null if the original parent did not appear in the IDs