org.datanucleus.jdo.metadata
Class JDOMetaDataManager

java.lang.Object
  org.datanucleus.metadata.MetaDataManager
      org.datanucleus.jdo.metadata.JDOMetaDataManager

public class JDOMetaDataManager
extends MetaDataManager

Manager of JDO MetaData information in DataNucleus.

Acts as a registry of JDO metadata so that metadata files don't need to be parsed multiple times. MetaData is stored as a FileMetaData, which contains PackageMetaData, which contains ClassMetaData, and so on. This maps exactly to the users model of their metadata. The users access point is getMetaDataForClass() which will check the known classes without metadata, then check the existing registered metdata, then check the valid locations for metdata files. This way, the metadata is managed from this single point.

When the MetaData is requested for a class, if it isn't already found, the valid file locations are checked for that class and the file containing it will be read. The MetaData for all classes, queries, sequences etc in that file are loaded at that point. In addition, all classes will be "populated" (meaning that their superclasses are assigned, and unspecified fields are added, and any related objects are linked). The MetaData of these classes are only initialised when they are absolutely needed - to avoid generating circular references in the initialisation process.

Each OMFContext typically will have its own MetaDataManager so allowing Meta-Data to be for different datastores. In addition, each PMF can allow MetaData files to use a particular suffix, hence we allow the JDO/ORM file suffices to be specifiable at construction.

Field Summary

static int	ALL_JDO_LOCATIONS MetaData files will be searched in all possible locations defined in JDO1.0, JDO1.0.1, JDO2.0 or later
protected java.util.Map<java.lang.String,AbstractClassMetaData>	classMetaDataByInterface Map of ClassMetaData, keyed by the interface class name (for "persistent-interface"s).
static int	JDO_1_0_0_LOCATIONS MetaData files will be searched in all locations defined in JDO 1.0
static int	JDO_1_0_1_LOCATIONS MetaData files will be searched in all locations defined in JDO 1.0.1
protected int	locationDefinition Definition of which locations we accept for MetaData files.
protected java.util.Map<java.lang.String,AbstractClassMetaData>	ormClassMetaDataByClass Map of ClassMetaData from ORM files, keyed by the class name.
protected org.datanucleus.jdo.metadata.JDOMetaDataManager.MetaDataRegisterClassListener	registerListener Listener for persistent class initialisations (since JDO uses a discovery process).

Fields inherited from class org.datanucleus.metadata.MetaDataManager

allowMetaDataLoad, annotationManager, classesWithoutPersistenceInfo, classMetaDataByAppIdClassName, classMetaDataByClass, classMetaDataByDiscriminatorName, classMetaDataByEntityName, directSubclassesByClass, fetchPlanMetaDataByName, fileMetaDataByURLString, listeners, LOCALISER, metaDataParser, omfContext, queryMetaDataByName, queryResultMetaDataByName, sequenceMetaDataByPackageSequence, supportsORM, tableGeneratorMetaDataByPackageSequence, userMetaDataNumber, utilisedFileMetaData, validateMetaData

Constructor Summary

JDOMetaDataManager(OMFContext ctxt)
Constructor.

Method Summary

void	addORMDataToClass(java.lang.Class c, ClassLoaderResolver clr) Load up and add the O/R mapping info for the specified class to the stored JDO ClassMetaData.
void	close() Clear resources
ClassMetaData	getClassMetaDataForImplementationOfPersistentInterface(java.lang.String interfaceName) Accessor for the metadata for the implementation of the specified "persistent-interface".
java.lang.String	getImplementationNameForPersistentInterface(java.lang.String interfaceName) Accessor for the implementation name for the specified "persistent-interface".
AbstractClassMetaData	getMetaDataForClassInternal(java.lang.Class c, ClassLoaderResolver clr) Internal method for accessing the MetaData for a class.
InterfaceMetaData	getMetaDataForInterface(java.lang.Class c, ClassLoaderResolver clr) Main accessor for the MetaData for a "persistent-interface".
QueryMetaData	getMetaDataForQuery(java.lang.Class cls, ClassLoaderResolver clr, java.lang.String queryName) Accessor for the MetaData for a named query for a class.
SequenceMetaData	getMetaDataForSequence(ClassLoaderResolver clr, java.lang.String packageSequenceName) Accessor for the MetaData for a Sequence in a package.
java.util.List	getValidMetaDataLocationsForClass(java.lang.String fileExtension, java.lang.String fileModifier, java.lang.String className) Method to return the valid metadata locations to contain a particular class.
java.util.List	getValidMetaDataLocationsForPackage(java.lang.String fileExtension, java.lang.String fileModifier, java.lang.String packageName) Method to return the valid metadata locations to contain a particular package.
boolean	isPersistentDefinitionImplementation(java.lang.String implName) Convenience method to return if the passed class name is an implementation of a "persistent definition".
boolean	isPersistentInterface(java.lang.String name) Convenience method to return if the passed class name is a "persistent-interface".
boolean	isPersistentInterfaceImplementation(java.lang.String interfaceName, java.lang.String implName) Convenience method to return if the passed class name is an implementation of the passed "persistent-interface".
protected FileMetaData	loadMetaDataForClass(java.lang.Class pc_class, ClassLoaderResolver clr, java.lang.String mappingModifier, java.lang.String metadataFileExtension, MetadataFileType metadataType, boolean populate) Method to find the Meta-Data file for a specified class.
protected FileMetaData	parseFile(java.net.URL fileURL) Utility to parse a file, using the "jdo" MetaData handler.
void	registerFile(java.lang.String fileURLString, FileMetaData filemd, ClassLoaderResolver clr) Method to take the FileMetaData and register the relevant parts of it with the assorted caches provided.
void	registerImplementationOfAbstractClass(ClassMetaData cmd, java.lang.Class implClass, ClassLoaderResolver clr) Method to register the metadata for an implementation of a persistent abstract class.
void	registerPersistentInterface(InterfaceMetaData imd, java.lang.Class implClass, ClassLoaderResolver clr) Method to register a persistent interface and its implementation with the MetaData system.

Methods inherited from class org.datanucleus.metadata.MetaDataManager

deregisterListener, getAllowMetaDataLoad, getApiAdapter, getClassesImplementingInterface, getClassesWithMetaData, getClassMetaDataWithApplicationId, getFileMetaData, getMetaDataForClass, getMetaDataForClass, getMetaDataForDiscriminator, getMetaDataForEntityName, getMetaDataForFetchPlan, getMetaDataForImplementationOfReference, getMetaDataForMember, getMetaDataForMember, getMetaDataForPersistenceUnit, getMetaDataForQueryResult, getMetaDataForTableGenerator, getOMFContext, getReferencedClasses, getReferencedClassMetaData, getSubclassesForClass, hasMetaDataForClass, initialiseAbstractClassMetaData, initialiseClassMetaData, initialiseFileMetaData, initialiseFileMetaDataForUse, initialiseInterfaceMetaData, isClassPersistable, isClassWithoutPersistenceInfo, isEnhancing, loadAnnotationsForClass, loadClasses, loadFiles, loadJar, loadMetadataFiles, loadPersistenceUnit, loadUserMetaData, logConfiguration, parsePersistenceFiles, populateAbstractClassMetaData, populateFileMetaData, readMetaDataForClass, readMetaDataForMember, registerFetchPlansForFile, registerListener, registerMetaDataForClass, registerQueriesForFile, registerQueryResultMetaDataForFile, registerSequencesForFile, registerTableGeneratorsForFile, setAllowMetaDataLoad, setValidate, supportsORM

Methods inherited from class java.lang.Object

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

Field Detail

ALL_JDO_LOCATIONS

public static final int ALL_JDO_LOCATIONS

MetaData files will be searched in all possible locations defined in JDO1.0, JDO1.0.1, JDO2.0 or later

See Also:

Constant Field Values

JDO_1_0_0_LOCATIONS

public static final int JDO_1_0_0_LOCATIONS

MetaData files will be searched in all locations defined in JDO 1.0

See Also:

Constant Field Values

JDO_1_0_1_LOCATIONS

public static final int JDO_1_0_1_LOCATIONS

MetaData files will be searched in all locations defined in JDO 1.0.1

See Also:

Constant Field Values

locationDefinition

protected int locationDefinition

Definition of which locations we accept for MetaData files.

ormClassMetaDataByClass

protected java.util.Map<java.lang.String,AbstractClassMetaData> ormClassMetaDataByClass

Map of ClassMetaData from ORM files, keyed by the class name.

classMetaDataByInterface

protected java.util.Map<java.lang.String,AbstractClassMetaData> classMetaDataByInterface

Map of ClassMetaData, keyed by the interface class name (for "persistent-interface"s). Keyed by the persistent-interface name.

registerListener

protected org.datanucleus.jdo.metadata.JDOMetaDataManager.MetaDataRegisterClassListener registerListener

Listener for persistent class initialisations (since JDO uses a discovery process).

Constructor Detail

JDOMetaDataManager

public JDOMetaDataManager(OMFContext ctxt)

Constructor.

Parameters:

ctxt - ObjectManagerFactory Context that this metadata manager operates in

Method Detail

close

public void close()

Clear resources

Overrides:

close in class MetaDataManager

parseFile

protected FileMetaData parseFile(java.net.URL fileURL)

Utility to parse a file, using the "jdo" MetaData handler.

Specified by:

parseFile in class MetaDataManager

Parameters:

fileURL - URL of the file

Returns:

The FileMetaData for this file

registerFile

public void registerFile(java.lang.String fileURLString,
                         FileMetaData filemd,
                         ClassLoaderResolver clr)

Method to take the FileMetaData and register the relevant parts of it with the assorted caches provided.

Specified by:

registerFile in class MetaDataManager

Parameters:

fileURLString - URL of the metadata file

filemd - The File MetaData

getMetaDataForClassInternal

public AbstractClassMetaData getMetaDataForClassInternal(java.lang.Class c,
                                                         ClassLoaderResolver clr)

Internal method for accessing the MetaData for a class. The MetaData returned can be uninitialised. Runs through the following process

1. Checks if the class is known not to have metata
2. Check if we have metadata for the class in one of the files that has been parsed.
3. If we have metadata, check that it is initialised
4. If we don't have metadata, find the file for this class.
5. If we cant find a file for it, add it to the list of classes known to have no metadata

Specified by:

getMetaDataForClassInternal in class MetaDataManager

Parameters:

c - The class to find MetaData for

Returns:

The ClassMetaData for this class (or null if not found)

getMetaDataForQuery

public QueryMetaData getMetaDataForQuery(java.lang.Class cls,
                                         ClassLoaderResolver clr,
                                         java.lang.String queryName)

Accessor for the MetaData for a named query for a class. If the query is not found, will check all valid JDO file locations and try to load it.

Overrides:

getMetaDataForQuery in class MetaDataManager

Parameters:

cls - The class which has the query defined for it

clr - the ClassLoaderResolver

queryName - Name of the query

Returns:

The QueryMetaData for the query for this class

getMetaDataForSequence

public SequenceMetaData getMetaDataForSequence(ClassLoaderResolver clr,
                                               java.lang.String packageSequenceName)

Accessor for the MetaData for a Sequence in a package. If the sequence is not yet known will search the valid locations for the passed name.

Overrides:

getMetaDataForSequence in class MetaDataManager

Parameters:

clr - the ClassLoaderResolver

packageSequenceName - Fully qualified name of the sequence (inc package name)

Returns:

The SequenceMetaData for this named sequence

addORMDataToClass

public void addORMDataToClass(java.lang.Class c,
                              ClassLoaderResolver clr)

Load up and add the O/R mapping info for the specified class to the stored JDO ClassMetaData.

Overrides:

addORMDataToClass in class MetaDataManager

Parameters:

c - The class

clr - the ClassLoaderResolver

loadMetaDataForClass

protected FileMetaData loadMetaDataForClass(java.lang.Class pc_class,
                                            ClassLoaderResolver clr,
                                            java.lang.String mappingModifier,
                                            java.lang.String metadataFileExtension,
                                            MetadataFileType metadataType,
                                            boolean populate)

Method to find the Meta-Data file for a specified class. Checks the locations one-by-one, and checks for existence of the specified class in the file. If a valid file is found it is loaded no matter if the file contains the actual class. When a file is found containing the class the process stops and the FileMetaData for that file (containing the class) returned.

Allows 2 variations on the naming above. The first is a modifier which caters for a JDO 2.0 requirement whereby the user can specify a modifier such as "mysql", which would mean that this should search for filenames "package-mysql.jdo". The second variation is the suffix of the file. This is "jdo" by default, but JDO 2.0 has situations where "orm", or "jdoquery" are required as a suffix.

Parameters:

pc_class - The class/interface to retrieve the metadata file for

clr - the ClassLoaderResolver

mappingModifier - Any modifier for the filename for mapping

metadataFileExtension - File extension of metadata files (e.g "jdo")

metadataType - Type of metadata file to load

populate - Whether to populate any loaded MetaData classes

Returns:

FileMetaData for the file containing the class

getValidMetaDataLocationsForPackage

public java.util.List getValidMetaDataLocationsForPackage(java.lang.String fileExtension,
                                                          java.lang.String fileModifier,
                                                          java.lang.String packageName)

Method to return the valid metadata locations to contain a particular package.

Parameters:

fileExtension - File extension (e.g "jdo")

fileModifier - Any modifier (for use when using ORM files package-mysql.orm, this is the "mysql" part)

packageName - The package name to look for

Returns:

The list of valid locations

getValidMetaDataLocationsForClass

public java.util.List getValidMetaDataLocationsForClass(java.lang.String fileExtension,
                                                        java.lang.String fileModifier,
                                                        java.lang.String className)

Method to return the valid metadata locations to contain a particular class.

Parameters:

fileExtension - File extension (e.g "jdo")

fileModifier - Any modifier (for use when using ORM files package-mysql.orm, this is the "mysql" part)

className - The class name to look for

Returns:

The list of valid locations

getMetaDataForInterface

public InterfaceMetaData getMetaDataForInterface(java.lang.Class c,
                                                 ClassLoaderResolver clr)

Main accessor for the MetaData for a "persistent-interface". All MetaData returned from this method will be initialised and ready for full use.

Overrides:

getMetaDataForInterface in class MetaDataManager

Parameters:

c - The interface to find MetaData for

clr - the ClassLoaderResolver

Returns:

The InterfaceMetaData for this interface (or null if not found)

isPersistentInterface

public boolean isPersistentInterface(java.lang.String name)

Convenience method to return if the passed class name is a "persistent-interface".

Overrides:

isPersistentInterface in class MetaDataManager

Parameters:

name - Name if the interface

Returns:

Whether it is a "persistent-interface"

isPersistentInterfaceImplementation

public boolean isPersistentInterfaceImplementation(java.lang.String interfaceName,
                                                   java.lang.String implName)

Convenience method to return if the passed class name is an implementation of the passed "persistent-interface".

Overrides:

isPersistentInterfaceImplementation in class MetaDataManager

Parameters:

interfaceName - Name of the persistent interface

implName - The implementation name

Returns:

Whether it is a (generated) impl of the persistent interface

isPersistentDefinitionImplementation

public boolean isPersistentDefinitionImplementation(java.lang.String implName)

Convenience method to return if the passed class name is an implementation of a "persistent definition".

Overrides:

isPersistentDefinitionImplementation in class MetaDataManager

Parameters:

implName - The implementation name

Returns:

Whether it is a (generated) impl of the persistent interface or abstract class

getImplementationNameForPersistentInterface

public java.lang.String getImplementationNameForPersistentInterface(java.lang.String interfaceName)

Accessor for the implementation name for the specified "persistent-interface".

Overrides:

getImplementationNameForPersistentInterface in class MetaDataManager

Parameters:

interfaceName - The name of the persistent interface

Returns:

The name of the implementation class

getClassMetaDataForImplementationOfPersistentInterface

public ClassMetaData getClassMetaDataForImplementationOfPersistentInterface(java.lang.String interfaceName)

Accessor for the metadata for the implementation of the specified "persistent-interface".

Overrides:

getClassMetaDataForImplementationOfPersistentInterface in class MetaDataManager

Parameters:

interfaceName - The name of the persistent interface

Returns:

The ClassMetaData of the implementation class

registerPersistentInterface

public void registerPersistentInterface(InterfaceMetaData imd,
                                        java.lang.Class implClass,
                                        ClassLoaderResolver clr)

Method to register a persistent interface and its implementation with the MetaData system.

Overrides:

registerPersistentInterface in class MetaDataManager

Parameters:

imd - MetaData for the interface

implClass - The implementation class

clr - ClassLoader Resolver to use

registerImplementationOfAbstractClass

public void registerImplementationOfAbstractClass(ClassMetaData cmd,
                                                  java.lang.Class implClass,
                                                  ClassLoaderResolver clr)

Method to register the metadata for an implementation of a persistent abstract class.

Overrides:

registerImplementationOfAbstractClass in class MetaDataManager

Parameters:

cmd - MetaData for the abstract class

implClass - The implementation class

clr - ClassLoader resolver