uk.ac.starlink.table.join

Enum PairMode

java.lang.Object

java.lang.Enum<PairMode>

uk.ac.starlink.table.join.PairMode

All Implemented Interfaces:

Serializable, Comparable<PairMode>

public enum PairMode
extends Enum<PairMode>

Enumeration used to determine which row links result from a pair match operation.

See Also:

RowMatcher.findPairMatches(PairMode)

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALL All matches are returned.
BEST Only the best matches are returned, obtained symmetrically.
BEST1 For each row in table 1, only the best match in table 2 is returned.
BEST2 For each row in table 2, only the best match in table 1 is returned.

Method Summary

Modifier and Type	Method and Description
String	getSummary() Returns a short summary of the matching policy.
boolean	mayProduceGroups() Indicates whether the result of a match performed in this mode may contain non-trivial related groups of rows.
static PairMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static PairMode[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

ALL

public static final PairMode ALL

All matches are returned.

BEST

public static final PairMode BEST

Only the best matches are returned, obtained symmetrically. Each row from both input tables will appear in at most one RowLink in the result.

BEST1

public static final PairMode BEST1

For each row in table 1, only the best match in table 2 is returned. Each row from table 1 will appear a maximum of once in the result, but rows from table 2 may appear multiple times.

BEST2

public static final PairMode BEST2

For each row in table 2, only the best match in table 1 is returned. Each row from table 2 will appear a maximum of once in the result, but rows from table 1 may appear multiple times.

Method Detail

values

public static PairMode[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (PairMode c : PairMode.values())
    System.out.println(c);

Returns:

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

valueOf

public static PairMode valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null

mayProduceGroups

public boolean mayProduceGroups()

Indicates whether the result of a match performed in this mode may contain non-trivial related groups of rows. A group represents a match in which an object in one table corresponds to more than object in the other table.

Returns:

true iff this mode may result in ambiguous matches

See Also:

MatchStarTables.findGroups(java.util.Collection<uk.ac.starlink.table.join.RowLink>)

getSummary

public String getSummary()

Returns a short summary of the matching policy.

Returns:

short description string