org.datanucleus.store.rdbms.key

Class Index

java.lang.Object

org.datanucleus.store.rdbms.key.Index

public class Index
extends Object

Representation of an index.

Field Summary

Fields

Modifier and Type	Field and Description
protected List<Column>	columns Columns that the key relates to.
protected String	name Name of the key.
protected Table	table Table that the key applies to.

Constructor Summary

Constructors

Constructor and Description
Index(CandidateKey ck) Constructor.
Index(ForeignKey fk) Constructor.
Index(Table table, boolean isUnique, String extendedIndexSettings) Constructor.

Method Summary

Modifier and Type	Method and Description
void	addColumn(Column col) Class to add a column to the key
protected void	assertSameDatastoreObject(Column col) Utility to assert if the column is for a different table.
boolean	equals(Object obj) Equality operator.
String	getColumnList() Accessor for the column list
static String	getColumnList(Collection cols) Method to return the list of columns which the key applies to.
List<Column>	getColumns() Accessor for the columns that the key relates to.
String	getExtendedIndexSettings() Extended index settings, mostly datastore proprietary settings
String	getName() Accessor for the key name.
Table	getTable() Accessor for the table
boolean	getUnique() Accessor for whether the index is unique
int	hashCode() Hashcode operator.
void	setColumn(int seq, Column col) Sets a column for in a specified position seq
protected static void	setMinSize(List list, int size)
void	setName(String name) Mutator for the key name.
int	size() Accessor for the size.
boolean	startsWith(org.datanucleus.store.rdbms.key.Key key) Check if this starts with the same columns specified in key.
String	toString() Stringify method.

Methods inherited from class java.lang.Object

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

Field Detail

name

protected String name

Name of the key.

table

protected Table table

Table that the key applies to.

columns

protected List<Column> columns

Columns that the key relates to.

Constructor Detail

Index

public Index(Table table,
             boolean isUnique,
             String extendedIndexSettings)

Constructor.

Parameters:

table - The table

isUnique - Whether the index is unique

extendedIndexSettings - extended index settings

Index

public Index(CandidateKey ck)

Constructor.

Parameters:

ck - Candidate key to use as a basis

Index

public Index(ForeignKey fk)

Constructor.

Parameters:

fk - Foreign key to use as a basis

Method Detail

getUnique

public boolean getUnique()

Accessor for whether the index is unique

Returns:

Whether it is unique.

setColumn

public void setColumn(int seq,
                      Column col)

Sets a column for in a specified position seq

Parameters:

seq - the specified position for the col

col - the Column

size

public int size()

Accessor for the size.

Returns:

The size.

hashCode

public int hashCode()

Hashcode operator.

Returns:

The hashcode

equals

public boolean equals(Object obj)

Equality operator.

Parameters:

obj - Object to compare against

Returns:

Whether they are equal.

getExtendedIndexSettings

public String getExtendedIndexSettings()

Extended index settings, mostly datastore proprietary settings

Returns:

the extended settings

toString

public String toString()

Stringify method.

Overrides:

toString in class Object

Returns:

String version of this object.

getName

public String getName()

Accessor for the key name.

Returns:

Key name

getTable

public Table getTable()

Accessor for the table

Returns:

table

getColumns

public List<Column> getColumns()

Accessor for the columns that the key relates to.

Returns:

the List of columns.

getColumnList

public String getColumnList()

Accessor for the column list

Returns:

The column list

addColumn

public void addColumn(Column col)

Class to add a column to the key

Parameters:

col - The column to add

startsWith

public boolean startsWith(org.datanucleus.store.rdbms.key.Key key)

Check if this starts with the same columns specified in key.

Parameters:

key - the Key (may be multiple number of columns)

Returns:

true if this columns starts with columns specified in key

setName

public void setName(String name)

Mutator for the key name.

Parameters:

name - The key name

assertSameDatastoreObject

protected void assertSameDatastoreObject(Column col)

Utility to assert if the column is for a different table.

Parameters:

col - The column to compare with

setMinSize

protected static void setMinSize(List list,
                                 int size)

getColumnList

public static String getColumnList(Collection cols)

Method to return the list of columns which the key applies to.

Parameters:

cols - The columns.

Returns:

The column list.