gudusoft.gsqlparser.dlineage.dataflow.model

Class StarLinkColumnIndex<C extends Column>

Object

gudusoft.gsqlparser.dlineage.dataflow.model.StarLinkColumnIndex<C>

public final class StarLinkColumnIndex<C extends Column>
extends Object

The columns of a result set or table, found by the star link that names them: for each name, the first column in list order that carries it. A column is found by its folded name as the link's display, as the analyzer's lookup map did; while star links are grouped by identity, a link that has an identifier finds the column of that identifier, and falls back to the display only among columns that have none.

Internal contract of the lineage analyzer.

Constructor Summary

Constructors

Constructor and Description
StarLinkColumnIndex(List<C> columns)

Method Summary

Modifier and Type	Method and Description
C	get(Column link, int ordinal) The first column the star link at ordinal of link names, or null.
Collection<C>	values() The first column of each folded name, in the order the analyzer's lookup map iterated them; while links are grouped by identity, followed by the first column of each identity that shares its folded name with another.

Methods inherited from class Object

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

Constructor Detail

StarLinkColumnIndex

public StarLinkColumnIndex(List<C> columns)

Method Detail

get

public C get(Column link,
             int ordinal)

The first column the star link at ordinal of link names, or null.

values

public Collection<C> values()

The first column of each folded name, in the order the analyzer's lookup map iterated them; while links are grouped by identity, followed by the first column of each identity that shares its folded name with another.