uk.ac.starlink.table.join

Class MultiJoinType

java.lang.Object

uk.ac.starlink.table.join.MultiJoinType

public class MultiJoinType
extends Object

Enumeration defining how each table in a multi-table join can determines the acceptability of a match. Acceptability can be used to decide which matches form part of the output table resulting from a match.

Since:

4 Dec 2007

Author:

Mark Taylor

Field Summary

Fields

Modifier and Type	Field and Description
static MultiJoinType	ALWAYS Any match containing table (even alone) is acceptable.
static MultiJoinType	DEFAULT No constraints on match inclusion for table.
static MultiJoinType	MATCH Table must be present in an acceptable match.
static MultiJoinType	NOMATCH Table must be absent in an acceptable match.

Method Summary

Modifier and Type	Method and Description
static boolean	accept(MultiJoinType[] joinTypes, boolean[] present) Determines acceptability of a sequence of items based on a sequence of acceptability criteria.
String	toString() Returns join type name.

Methods inherited from class java.lang.Object

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

Field Detail

MATCH

public static final MultiJoinType MATCH

Table must be present in an acceptable match.

NOMATCH

public static final MultiJoinType NOMATCH

Table must be absent in an acceptable match.

ALWAYS

public static final MultiJoinType ALWAYS

Any match containing table (even alone) is acceptable. Overrides MATCH and NOMATCH.

DEFAULT

public static final MultiJoinType DEFAULT

No constraints on match inclusion for table.

Method Detail

toString

public String toString()

Returns join type name.

Overrides:

toString in class Object

Returns:

name

accept

public static boolean accept(MultiJoinType[] joinTypes,
                             boolean[] present)

Determines acceptability of a sequence of items based on a sequence of acceptability criteria.

Parameters:

joinTypes - array of acceptability criteria

present - array of flags for presence/absence of items

Returns:

true iff acceptability criteria are fulfilled