com.hammurapi.extract

Interface ExtractorFactory

All Known Implementing Classes:

ScriptingExtractorFactory

public interface ExtractorFactory

Extractor factory service. Creates scripted extractors and predicates. The service is discoverable using the Java Service Loader framework.

Field Summary

Fields

Modifier and Type	Field and Description
static String	ARGS_BINDING Binding for arguments arrray if parameter names are not provided.
static String	CONTEXT_BINDING Binding for context object.
static ExtractorFactory	INSTANCE This instance uses the service loading framework to discover extractor factory providers.

Method Summary

Methods

Modifier and Type	Method and Description
<T,V,C> Extractor<T,V,C>	createExtractor(String language, String code, String[] parameterNames, Class<T>[] parameterTypes, Class<V> valueType, Class<C> contextType, ClassLoader classLoader) Creates extractor.
<T,C> Predicate<T,C>	createPredicate(String language, String code, String[] parameterNames, Class<T>[] parameterTypes, Class<C> contextType, ClassLoader classLoader) Creates extractor.

Field Detail

CONTEXT_BINDING

static final String CONTEXT_BINDING

Binding for context object.

See Also:

Constant Field Values

ARGS_BINDING

static final String ARGS_BINDING

Binding for arguments arrray if parameter names are not provided.

See Also:

Constant Field Values

INSTANCE

static final ExtractorFactory INSTANCE

This instance uses the service loading framework to discover extractor factory providers. It iterates over the providers and invokes provider's createExtractor() methods until it gets not null result which is returned from the method. If there are no providers supporting given language, then null is returned.

Method Detail

createExtractor

<T,V,C> Extractor<T,V,C> createExtractor(String language,
                                       String code,
                                       String[] parameterNames,
                                       Class<T>[] parameterTypes,
                                       Class<V> valueType,
                                       Class<C> contextType,
                                       ClassLoader classLoader)

Creates extractor.

Type Parameters:

T - Source objects type.

V - Value type.

Parameters:

language - Extractor language.

code - Extractor code.

parameterTypes - Extractor parameter types.

valueType - Extractor value type. If this type is Boolean then the factory shall return Predicate.

classLoader - Class loader to use for script evaluation.

Returns:

Extractor or null if this factory doesn't support given language.

createPredicate

<T,C> Predicate<T,C> createPredicate(String language,
                                   String code,
                                   String[] parameterNames,
                                   Class<T>[] parameterTypes,
                                   Class<C> contextType,
                                   ClassLoader classLoader)

Creates extractor.

Type Parameters:

T - Source objects type.

Parameters:

language - Extractor language.

code - Extractor code.

parameterTypes - Extractor parameter types.

valueType - Extractor value type. If this type is Boolean then the factory shall return Predicate.

classLoader - Class loader to use for script evaluation.

Returns:

Extractor or null if this factory doesn't support given language.