org.codehaus.stax2.osgi.Stax2ValidationSchemaFactoryProvider Maven / Gradle / Ivy
package org.codehaus.stax2.osgi;
import org.codehaus.stax2.XMLOutputFactory2;
import org.codehaus.stax2.XMLStreamProperties;
import org.codehaus.stax2.validation.XMLValidationSchemaFactory;
/**
* Simple interface to be used for registering objects that
* can construct {@link XMLValidationSchemaFactory} instances with OSGi framework.
* The added indirection (provider constructing factory) is needed because
* of impedance between OSGi service objects (which are essentially
* singletons) and Stax/Stax2 factories which are not.
*
* Note: implementations of provider should NOT use introspection
* via {@link XMLValidationSchemaFactory#newInstance} as it will
* not work with OSGi. Instead, providers should directly construct
* instances of concrete factory they represent. That is, there will
* be one provider implementation per concrete Stax/Stax2 implementation
*/
public interface Stax2ValidationSchemaFactoryProvider
{
/*
///////////////////////////////////////////////////////////////
// Service property names to use with the provider
///////////////////////////////////////////////////////////////
*/
/**
* Service property that defines name of Stax2 implementation that
* this provider represents.
*/
public final static String OSGI_SVC_PROP_IMPL_NAME = XMLStreamProperties.XSP_IMPLEMENTATION_NAME;
/**
* Service property that defines version of Stax2 implementation that
* this provider represents.
*/
public final static String OSGI_SVC_PROP_IMPL_VERSION = XMLStreamProperties.XSP_IMPLEMENTATION_VERSION;
/**
* Service property that defines type of Schemas (one of constants from
* {@link org.codehaus.stax2.validation.XMLValidationSchema},
* such as {@link org.codehaus.stax2.validation.XMLValidationSchema#SCHEMA_ID_DTD})
* that the schema factory this provider handles supports. Can be used
* to locate proper provider for the schema type.
*/
public final static String OSGI_SVC_PROP_SCHEMA_TYPE = "org.codehaus.stax2.validation.schemaType";
/*
///////////////////////////////////////////////////////////////
// Public provider API
///////////////////////////////////////////////////////////////
*/
/**
* Method that can be used to determine which schema type this
* provider (or, rather, factory instances of which provider
* constructs) supports.
*
* @return Id of schema type that the factory instantiated by this
* provider will support.
*/
public String getSchemaType();
/**
* Method called to create a new {@link XMLValidationSchemaFactory}
* instance. Each schema factory supports a single schema type;
* so caller has to ensure that the factory it is using supports
* schema it needs to instantiate. This can be done either by using
* service properties, or by inspecting provider instances for
* schema type they support (see {@link #getSchemaType}).
*
* @return ValidationSchema factory configured to implementation-specific
* default settings, if type is supported by this provider; null
* if not.
*/
public XMLValidationSchemaFactory createValidationSchemaFactory();
}