Package org.ehrbase.openehr.aqlengine.pathanalysis

Enum Class PathInfo.JoinMode

java.lang.Object

java.lang.Enum<PathInfo.JoinMode>

org.ehrbase.openehr.aqlengine.pathanalysis.PathInfo.JoinMode

All Implemented Interfaces:

Serializable, Comparable<PathInfo.JoinMode>, Constable

Enclosing class:

PathInfo

public static enum PathInfo.JoinMode
extends Enum<PathInfo.JoinMode>

The number of (structure) children and if data is retrieved determines how a path node needs to be joined.

ROOT	noChild	oneChild	multipleChildren
data	ROOT	ROOT	ROOT
no data	∅	ROOT	ROOT
sub-node	noChild	oneChild	multipleChildren
data	DATA	DATA	DATA
no data	∅	INTERNAL_SINGLE_CHILD	INTERNAL_FORK

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
DATA	Node that contributes data to the result; The number of children is secondary.
INTERNAL_FORK	Internal node with multiple children.
INTERNAL_SINGLE_CHILD	Internal node with just a single child.
ROOT	Root node stemming from the FROM clause.

Method Summary

Modifier and Type	Method	Description
static PathInfo.JoinMode	valueOf(String name)	Returns the enum constant of this class with the specified name.
static PathInfo.JoinMode[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

ROOT

public static final PathInfo.JoinMode ROOT

Root node stemming from the FROM clause. Is already "left-joined". Hence all children need to be left-joined.

DATA

public static final PathInfo.JoinMode DATA

Node that contributes data to the result; The number of children is secondary. The children need to be "left-joined" (P(⟕C_n)).

INTERNAL_SINGLE_CHILD

public static final PathInfo.JoinMode INTERNAL_SINGLE_CHILD

Internal node with just a single child. It does not directly contribute data to the result. It must only result in tuples when the child does. It can be joined with the child (P⋈C), or may, under some conditions, be omitted.

INTERNAL_FORK

public static final PathInfo.JoinMode INTERNAL_FORK

Internal node with multiple children. It does not directly contribute data to the result. It must only result in tuples when at least one of the children does.
This may be considered an inner join of the parent with the result of outer joining all children: P⋈(⟗ⁱ⁼¹_n(C_i))

Method Details

values

public static PathInfo.JoinMode[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static PathInfo.JoinMode valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null