Class Index

java.lang.Object

org.datanucleus.store.rdbms.key.Key

org.datanucleus.store.rdbms.key.ColumnOrderedKey

org.datanucleus.store.rdbms.key.Index

public class Index
extends ColumnOrderedKey

Representation of an INDEX.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	EXTENSION_INDEX_EXTENDED_SETTING
static final String	EXTENSION_INDEX_TYPE
private final boolean	isUnique

Fields inherited from class ColumnOrderedKey

columnOrdering, extensions

Fields inherited from class Key

columns, name, table

Constructor Summary

Constructors

Constructor	Description
Index(CandidateKey ck)	Constructor for an index for the specified candidate key.
Index(ForeignKey fk)	Constructor for an index for the specified foreign key.
Index(Table table, boolean isUnique, Map<String,String> extensions)	Constructor.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Equality operator.
boolean	getUnique()	Accessor for whether the index is unique
int	hashCode()	Hashcode operator.
String	toString()	Stringify method.

Methods inherited from class ColumnOrderedKey

addColumn, getColumnList, getValueForExtension, setColumn, setColumnOrdering

Methods inherited from class Key

assertSameDatastoreObject, getColumnList, getColumnList, getColumns, getName, getNumberOfColumns, getTable, setListMinimumSize, setName

Methods inherited from class Object

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

Field Details

EXTENSION_INDEX_EXTENDED_SETTING

public static final String EXTENSION_INDEX_EXTENDED_SETTING

See Also:

• Constant Field Values

EXTENSION_INDEX_TYPE

public static final String EXTENSION_INDEX_TYPE

See Also:

• Constant Field Values

isUnique

private final boolean isUnique

Constructor Details

Index

public Index(Table table,
 boolean isUnique,
 Map<String,String> extensions)

Constructor.

Parameters:

table - The table

isUnique - Whether the index is unique

extensions - Any extensions for the index

Index

public Index(CandidateKey ck)

Constructor for an index for the specified candidate key.

Parameters:

ck - Candidate key to use as a basis

Index

public Index(ForeignKey fk)

Constructor for an index for the specified foreign key.

Parameters:

fk - Foreign key to use as a basis

Method Details

getUnique

public boolean getUnique()

Accessor for whether the index is unique

Returns:

Whether it is unique.

hashCode

public int hashCode()

Hashcode operator.

Overrides:

hashCode in class Key

Returns:

The hashcode

equals

public boolean equals(Object obj)

Equality operator.

Overrides:

equals in class Key

Parameters:

obj - Object to compare against

Returns:

Whether they are equal.

toString

public String toString()

Stringify method. Generates a form of the index ready to be used in a DDL statement. e.g

INDEX (col1, col2)

Overrides:

toString in class Object

Returns:

String version of this object.