org.apache.openjpa.lib.conf
Interface ProductDerivation

All Known Subinterfaces:

OpenJPAProductDerivation

All Known Implementing Classes:

AbstractProductDerivation, JDBCPersistenceProductDerivation, JDBCProductDerivation, PersistenceProductDerivation, ProductDerivation

public interface ProductDerivation

Hooks for deriving products with additional functionality. Parses configuration information from global, default or explictly-specified resources. All implementations of this interface will have a chance to mutate a Configuration both before and after the user-specified configuration data is loaded. The order in which the product derivations are evaluated is determined by the specificity of the derivation type.

Since:

0.4.1

Author:

Abe White, Pinaki Poddar

Field Summary

static int	TYPE_FEATURE
static int	TYPE_PRODUCT

Method Summary

boolean	afterSpecificationSet(Configuration conf) Called after the specification has been set.
void	beforeConfigurationClose(Configuration conf) Called before the given Configuration is closed.
boolean	beforeConfigurationConstruct(ConfigurationProvider cp) Provides the instance with a callback to mutate the initial properties of the ConfigurationProvider.
boolean	beforeConfigurationLoad(Configuration conf) Provides the instance with the opportunity to mutate conf before the user configuration is applied.
List	getAnchorsInFile(File file) Return a List of all the anchors defined in file.
List	getAnchorsInResource(String resource) Return a List of all the anchors defined in resource.
String	getConfigurationPrefix() Return the configuration prefix for properties of this product.
String	getDefaultResourceLocation() Return a string identifying the default resource location for this product derivation, if one exists.
int	getType() Return the type of derivation.
ConfigurationProvider	load(File file, String anchor) Load given file, or return null if it is not a file this receiver understands.
ConfigurationProvider	load(String resource, String anchor, ClassLoader loader) Load the given given resource into the returned ConfigurationProvider, or return null if it is not a resource this receiver understands.
ConfigurationProvider	loadDefaults(ClassLoader loader) Load defaults into the returned ConfigurationProvider, or return null if no defaults are found.
ConfigurationProvider	loadGlobals(ClassLoader loader) Load globals into the returned ConfigurationProvider, or return null if no globals are found.
void	validate() Ensure that this derivation is valid.

Field Detail

TYPE_PRODUCT

static final int TYPE_PRODUCT

See Also:

Constant Field Values

TYPE_FEATURE

static final int TYPE_FEATURE

See Also:

Constant Field Values

Method Detail

getType

int getType()

Return the type of derivation.

getConfigurationPrefix

String getConfigurationPrefix()

Return the configuration prefix for properties of this product.

validate

void validate()
              throws Exception

Ensure that this derivation is valid. This action might consist of loading classes for the product this derivation represents to be sure they exist. Throw any throwable to indicate an invalid derivation. Invalid derivations will not be used.

Throws:

Exception

loadGlobals

ConfigurationProvider loadGlobals(ClassLoader loader)
                                  throws Exception

Load globals into the returned ConfigurationProvider, or return null if no globals are found.

Throws:

Exception

loadDefaults

ConfigurationProvider loadDefaults(ClassLoader loader)
                                   throws Exception

Load defaults into the returned ConfigurationProvider, or return null if no defaults are found.

Throws:

Exception

load

ConfigurationProvider load(String resource,
                           String anchor,
                           ClassLoader loader)
                           throws Exception

Load the given given resource into the returned ConfigurationProvider, or return null if it is not a resource this receiver understands. The given class loader may be null.

Parameters:

anchor - optional named anchor within a multiple-configuration resource

Throws:

Exception

load

ConfigurationProvider load(File file,
                           String anchor)
                           throws Exception

Load given file, or return null if it is not a file this receiver understands.

Parameters:

anchor - optional named anchor within a multiple-configuration file

Throws:

Exception

getDefaultResourceLocation

String getDefaultResourceLocation()

Return a string identifying the default resource location for this product derivation, if one exists. If there is no default location, returns null.

Since:

1.1.0

getAnchorsInFile

List getAnchorsInFile(File file)
                      throws IOException,
                             Exception

Return a List of all the anchors defined in file. The returned names are not fully-qualified, so must be used in conjunction with file in calls to load(java.io.File, String). Returns null or an empty list if no anchors could be found.

Throws:

IOException

Exception

Since:

1.1.0

getAnchorsInResource

List getAnchorsInResource(String resource)
                          throws Exception

Return a List of all the anchors defined in resource. The returned names are not fully-qualified, so must be used in conjunction with resource in calls to load(java.io.File, String). Returns null or an empty list if no anchors could be found.

Throws:

Exception

Since:

1.1.0

beforeConfigurationConstruct

boolean beforeConfigurationConstruct(ConfigurationProvider cp)

Provides the instance with a callback to mutate the initial properties of the ConfigurationProvider. This is primarily to alter or add properties that determine what type of configuration is constructed, and therefore is typically used at runtime only.

Returns:

true if given ConfigurationProvider has been mutated.

beforeConfigurationLoad

boolean beforeConfigurationLoad(Configuration conf)

Provides the instance with the opportunity to mutate conf before the user configuration is applied.

Returns:

true if given Configuration has been mutated.

afterSpecificationSet

boolean afterSpecificationSet(Configuration conf)

Called after the specification has been set.

Returns:

true if given Configuration has been mutated.

beforeConfigurationClose

void beforeConfigurationClose(Configuration conf)

Called before the given Configuration is closed.

Since:

0.9.7