Package org.fastnate.data

Class DefaultDataProviderFactory

java.lang.Object

org.fastnate.data.AbstractDataProviderFactory

org.fastnate.data.DefaultDataProviderFactory

All Implemented Interfaces:

DataProviderFactory

public class DefaultDataProviderFactory
extends AbstractDataProviderFactory

Finds and builds all implementations of DataProvider from the class path. Each found non abstract class extending DataProvider is instantiated:

1. First a constructor with parameters of an allowed type is searched.
2. Then all fields and setters marked with @Resource are initiated.
3. At the end all methods marked with @PostConstruct are invoked.
4. If nothing fails, the new provider is registered.

Allowed types for constructor parameters and resources:

• EntityImporter - the importer itself
• File - the data directory from the command line resp. from the property EntityImporter.DATA_FOLDER_KEY.
• Properties - the settings of the EntityImporter
• DataProvider - another provider, will throw an exception, if the given provider depends on the new one

The factory will search for the available data providers in the packages defined in the property EntityImporter.PACKAGES_KEY. In addition one can define one or more data providers in the file /META-INF/services/org.fastnate.data.DataProvider.

Author:

Tobias Liefke

Constructor Summary

Constructors

Constructor	Description
DefaultDataProviderFactory()

Method Summary

Modifier and Type	Method	Description
protected <C extends DataProvider> C	addProvider(EntityImporter importer, Class<C> providerClass)	Tries to instantiate the provider from the given class.
protected <C extends DataProvider> C	addProvider(EntityImporter importer, Constructor<C> constructor)	Tries to create a provider using the given constructor and adds it to list of providers in the EntityImporter.
void	createDataProviders(EntityImporter importer)	Discovers, builds and registers all DataProviders that are available for the current environment.

Methods inherited from class org.fastnate.data.AbstractDataProviderFactory

buildReflections, findImporterDependency, findProviderClasses

Methods inherited from class java.lang.Object

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

Constructor Details

DefaultDataProviderFactory

public DefaultDataProviderFactory()

Method Details

addProvider

protected <C extends DataProvider> C addProvider(EntityImporter importer,
 Class<C> providerClass)

Tries to instantiate the provider from the given class.

Parameters:

importer - the current importer that will be used with that provider

providerClass - the class of the provider to instantiate

Returns:

the created provider or null if the given class has no appropriate constructor

addProvider

protected <C extends DataProvider> C addProvider(EntityImporter importer,
 Constructor<C> constructor)

Tries to create a provider using the given constructor and adds it to list of providers in the EntityImporter.

Parameters:

importer - the current instance of the importer for adding the new provider

constructor - the constructor of the new provider

Returns:

the created provider or null if the given constructor is not appropriate

createDataProviders

public void createDataProviders(EntityImporter importer)

Description copied from interface: DataProviderFactory

Discovers, builds and registers all DataProviders that are available for the current environment. Ensures that the order of the providers is set in accordance with their dependencies.

Parameters:

importer - the current importer that needs the providers, new providers are added with EntityImporter.addDataProvider(DataProvider) or EntityImporter.addDataProvider(DataProvider, int)