gudusoft.gsqlparser.dlineage.dataflow.model

Class FieldNodeKey

Object

gudusoft.gsqlparser.dlineage.dataflow.model.FieldNodeKey

public final class FieldNodeKey
extends Object

The identity of a field node of a STRUCT tree (plan section 4.7): the column the tree hangs below, by object identity, and the steps below it, each FIELD step keyed by the analysis's identifier rules from the name as written, every other step by its kind. Two reads of one field of one column give equal keys whatever their spelling the rules equate (s.`Foo` and s.foo in Hive); a field named "a.b" (one step) and the path a.b (two steps) give different keys although they display alike.

In-process only: the owner is compared by identity, so a key never leaves the analysis that made it.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FieldNodeKey.StepKey One step of the path: its kind, and for a FIELD the name's identity key.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
Object	getOwner()
List<FieldNodeKey.StepKey>	getSteps()
int	hashCode()
static FieldNodeKey	of(Object owner, List<StructuredPathSegment> segments) The key of the node segments below owner (a column, or a result column).
static FieldNodeKey	of(TableColumn node) The key of a table's field path node: its declared column and its path.

Methods inherited from class Object

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

Method Detail

of

public static FieldNodeKey of(Object owner,
                              List<StructuredPathSegment> segments)

The key of the node segments below owner (a column, or a result column).

of

public static FieldNodeKey of(TableColumn node)

The key of a table's field path node: its declared column and its path.

getOwner

public Object getOwner()

getSteps

public List<FieldNodeKey.StepKey> getSteps()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object