org.datanucleus.store.rdbms.table

Class MapTable

java.lang.Object

org.datanucleus.store.rdbms.table.AbstractTable

org.datanucleus.store.rdbms.table.TableImpl

org.datanucleus.store.rdbms.table.JoinTable

org.datanucleus.store.rdbms.table.MapTable

All Implemented Interfaces:

DatastoreMap, org.datanucleus.store.schema.table.Table

public class MapTable
extends JoinTable
implements DatastoreMap

Representation of a join table for a Map. A Map covers a wide range of possibilities in terms of whether it allows duplicates or not, whether it allows nulls or not, whether it supports ordering via indexes etc. Consequently the join table can vary depending on the required capabilities.

JoinTable Mappings

The join table consists of the following mappings :-

• ownerMapping linking back to the owning class with the Collection.
• keyMapping either being an FK link to the key table or being an embedded/serialised key stored wholely in this table.
• valueMapping either being an FK link to the value table or being an embedded/serialised value stored wholely in this table.
• orderMapping which may be null, or otherwise stores an index for the keys. This is either to provide uniqueness or ordering (and part of the PK).

Field Summary

Fields

Modifier and Type	Field and Description
protected Map	embeddedKeyMappingsMap Map of field mappings when containing an embedded PC key.
protected Map	embeddedValueMappingsMap Map of field mappings when containing an embedded PC value.

Fields inherited from class org.datanucleus.store.rdbms.table.JoinTable

mmd, ownerMapping, ownerType

Fields inherited from class org.datanucleus.store.rdbms.table.AbstractTable

columns, columnsByName, dba, existsInDatastore, identifier, state, storeMgr, TABLE_STATE_INITIALIZED, TABLE_STATE_INITIALIZED_MODIFIED, TABLE_STATE_NEW, TABLE_STATE_PK_INITIALIZED, TABLE_STATE_VALIDATED

Constructor Summary

Constructors

Constructor and Description
MapTable(DatastoreIdentifier tableName, org.datanucleus.metadata.AbstractMemberMetaData mmd, RDBMSStoreManager storeMgr) Constructor.

Method Summary

Modifier and Type	Method and Description
protected void	applyUserPrimaryKeySpecification(org.datanucleus.metadata.PrimaryKeyMetaData pkmd) Convenience method to apply the user specification of <primary-key> columns
protected List	getExpectedCandidateKeys() Accessor for the candidate keys for this table.
List	getExpectedForeignKeys(org.datanucleus.ClassLoaderResolver clr) Accessor for the expected foreign keys for this table.
protected Set	getExpectedIndices(org.datanucleus.ClassLoaderResolver clr) Accessor for the indices for this table.
JavaTypeMapping	getKeyMapping() Accessor for the "key" mapping end of the relationship.
String	getKeyType() Accessor for the key type for this Map.
JavaTypeMapping	getMemberMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd) Accessor the for the mapping for a field stored in this table
JavaTypeMapping	getOrderMapping() Accessor for order mapping.
JavaTypeMapping	getValueMapping() Accessor for the "value" mapping end of the relationship.
String	getValueType() Accessor for the value type for this Map.
void	initialize(org.datanucleus.ClassLoaderResolver clr) Method to initialise the table definition.
boolean	isEmbeddedKey() Accessor for whether the key is embedded into this table.
boolean	isEmbeddedKeyPC() Accessor for whether the key is a persistable(embedded)
boolean	isEmbeddedValue() Accessor for whether the value is embedded into this table.
boolean	isEmbeddedValuePC() Accessor for whether the value is a persistable(embedded)
boolean	isSerialisedKey() Accessor for whether the key is serialised into this table.
boolean	isSerialisedKeyPC() Accessor for whether the key is a persistable(serialised)
boolean	isSerialisedValue() Accessor for whether the value is serialised into this table.
boolean	isSerialisedValuePC() Accessor for whether the value is a persistable(serialised)

Methods inherited from class org.datanucleus.store.rdbms.table.JoinTable

getIdMapping, getOwnerMapping, getOwnerMemberMetaData, getPrimaryKey, requiresPrimaryKey

Methods inherited from class org.datanucleus.store.rdbms.table.TableImpl

createConstraints, dropConstraints, getSQLAddCandidateKeyStatements, getSQLAddFKStatements, getSQLCreateIndexStatements, getSQLCreateStatements, getSQLDropStatements, initializeColumnInfoForPrimaryKeyColumns, initializeColumnInfoFromDatastore, logMapping, postInitialize, preInitialize, validate, validateColumns, validateConstraints, validatePrimaryKey

Methods inherited from class org.datanucleus.store.rdbms.table.AbstractTable

addColumn, addColumnInternal, allowDDLOutput, assertIsInitialized, assertIsInitializedModified, assertIsPKInitialized, assertIsPKUninitialized, assertIsUninitialized, assertIsValidated, create, drop, equals, executeDdlStatement, executeDdlStatementList, exists, getCatalogName, getClassMetaData, getColumn, getColumnForName, getColumnForPosition, getColumns, getDatastoreIdColumn, getDatastoreIdentifierFullyQualified, getDiscriminatorColumn, getDiscriminatorMapping, getDiscriminatorMetaData, getIdentifier, getMemberColumnMappingForEmbeddedMember, getMemberColumnMappingForMember, getMemberColumnMappings, getMultitenancyColumn, getMultitenancyMapping, getName, getNumberOfColumns, getSchemaName, getStoreManager, getVersionColumn, getVersionMapping, getVersionMetaData, hasColumn, hasColumnName, hashCode, isInitialized, isInitializedModified, isPKInitialized, isValidated, tableExistsInDatastore, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.datanucleus.store.rdbms.table.DatastoreMap

getOwnerMapping

Methods inherited from interface org.datanucleus.store.rdbms.table.Table

addColumn, create, drop, exists, getColumn, getDiscriminatorMapping, getDiscriminatorMetaData, getIdentifier, getIdMapping, getMultitenancyMapping, getStoreManager, getVersionMapping, getVersionMetaData, hasColumn, isInitialized, isInitializedModified, isValidated, postInitialize, preInitialize, validate

Methods inherited from interface org.datanucleus.store.schema.table.Table

getCatalogName, getClassMetaData, getColumnForName, getColumnForPosition, getColumns, getDatastoreIdColumn, getDiscriminatorColumn, getMemberColumnMappingForEmbeddedMember, getMemberColumnMappingForMember, getMemberColumnMappings, getMultitenancyColumn, getName, getNumberOfColumns, getSchemaName, getVersionColumn

Field Detail

embeddedKeyMappingsMap

protected Map embeddedKeyMappingsMap

Map of field mappings when containing an embedded PC key. Keyed by the FieldMetaData of the field.

embeddedValueMappingsMap

protected Map embeddedValueMappingsMap

Map of field mappings when containing an embedded PC value. Keyed by the FieldMetaData of the field.

Constructor Detail

MapTable

public MapTable(DatastoreIdentifier tableName,
                org.datanucleus.metadata.AbstractMemberMetaData mmd,
                RDBMSStoreManager storeMgr)

Constructor.

Parameters:

tableName - Identifier name of the table

mmd - MetaData for the field/property of the owner

storeMgr - The Store Manager managing these tables.

Method Detail

initialize

public void initialize(org.datanucleus.ClassLoaderResolver clr)

Method to initialise the table definition.

Parameters:

clr - The ClassLoaderResolver

applyUserPrimaryKeySpecification

protected void applyUserPrimaryKeySpecification(org.datanucleus.metadata.PrimaryKeyMetaData pkmd)

Convenience method to apply the user specification of <primary-key> columns

Parameters:

pkmd - MetaData for the primary key

isEmbeddedKey

public boolean isEmbeddedKey()

Accessor for whether the key is embedded into this table. This can be an embedded persistable, or an embedded simple type.

Returns:

Whether the key is embedded.

isSerialisedKey

public boolean isSerialisedKey()

Accessor for whether the key is serialised into this table. This can be an serialised persistable, or a serialised simple type.

Returns:

Whether the key is serialised.

isSerialisedKeyPC

public boolean isSerialisedKeyPC()

Accessor for whether the key is a persistable(serialised)

Returns:

Whether the key is PC and is serialised

isEmbeddedKeyPC

public boolean isEmbeddedKeyPC()

Accessor for whether the key is a persistable(embedded)

Returns:

Whether the key is PC and is embedded

isEmbeddedValue

public boolean isEmbeddedValue()

Accessor for whether the value is embedded into this table. This can be an embedded persistable, or an embedded simple type.

Returns:

Whether the value is embedded.

isSerialisedValue

public boolean isSerialisedValue()

Accessor for whether the value is serialised into this table. This can be an serialised persistable, or a serialised simple type.

Returns:

Whether the value is serialised.

isSerialisedValuePC

public boolean isSerialisedValuePC()

Accessor for whether the value is a persistable(serialised)

Returns:

Whether the value is PC and is serialised

isEmbeddedValuePC

public boolean isEmbeddedValuePC()

Accessor for whether the value is a persistable(embedded)

Returns:

Whether the value is PC and is embedded

getKeyMapping

public JavaTypeMapping getKeyMapping()

Accessor for the "key" mapping end of the relationship.

Specified by:

getKeyMapping in interface DatastoreMap

Returns:

The column mapping for the element.

getValueMapping

public JavaTypeMapping getValueMapping()

Accessor for the "value" mapping end of the relationship.

Specified by:

getValueMapping in interface DatastoreMap

Returns:

The column mapping for the element.

getKeyType

public String getKeyType()

Accessor for the key type for this Map.

Returns:

Name of key type.

getValueType

public String getValueType()

Accessor for the value type for this Map.

Returns:

Name of value type.

getOrderMapping

public JavaTypeMapping getOrderMapping()

Accessor for order mapping. The columns in this mapping are part of the primary key.

Returns:

The column mapping for objects without identity or not supported as part of the primary keys

getExpectedForeignKeys

public List getExpectedForeignKeys(org.datanucleus.ClassLoaderResolver clr)

Accessor for the expected foreign keys for this table.

Overrides:

getExpectedForeignKeys in class TableImpl

Parameters:

clr - The ClassLoaderResolver

Returns:

The expected foreign keys.

getExpectedIndices

protected Set getExpectedIndices(org.datanucleus.ClassLoaderResolver clr)

Accessor for the indices for this table. This includes both the user-defined indices (via MetaData), and the ones required by foreign keys (required by relationships).

Overrides:

getExpectedIndices in class TableImpl

Parameters:

clr - The ClassLoaderResolver

Returns:

The indices

getExpectedCandidateKeys

protected List getExpectedCandidateKeys()

Accessor for the candidate keys for this table.

Overrides:

getExpectedCandidateKeys in class TableImpl

Returns:

The indices

getMemberMapping

public JavaTypeMapping getMemberMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Accessor the for the mapping for a field stored in this table

Parameters:

mmd - MetaData for the field whose mapping we want

Returns:

The mapping