org.apache.clerezza.rdf.core.serializedform

Class Parser

java.lang.Object

org.apache.clerezza.rdf.core.serializedform.Parser

public class Parser
extends Object

This singleton class provides a method parse to transform serialized RDF forms into Graphs. Functionality is delegated to registered ParsingProviders. Such ParsingProviders can be registered and unregistered, later registered ParsingProviders shadow previously registered providers for the same format. Note on synchronization: ParsingProviders must be able to handle concurrent requests.

Author:

reto

Constructor Summary

Constructors

Constructor and Description
Parser() the constructor sets the singleton instance to allow instantiation by OSGi-DS.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	activate(org.osgi.service.component.ComponentContext componentContext)
protected void	bindConfigurationAdmin(org.osgi.service.cm.ConfigurationAdmin configurationAdmin)
void	bindParsingProvider(ParsingProvider provider) Registers a parsing provider
protected void	deactivate(org.osgi.service.component.ComponentContext componentContext)
static Parser	getInstance() This returns the singleton instance, if an instance has been previously created (e.g.
Set<String>	getSupportedFormats() Get a set of supported formats
Graph	parse(InputStream serializedGraph, String formatIdentifier) Parses a serialized Graph from an InputStream.
Graph	parse(InputStream serializedGraph, String formatIdentifier, UriRef baseUri) Parses a serialized Graph from an InputStream.
void	parse(MGraph target, InputStream serializedGraph, String formatIdentifier) Parses a serialized Graph from an InputStream.
void	parse(MGraph target, InputStream serializedGraph, String formatIdentifier, UriRef baseUri) Parses a serialized Graph from an InputStream.
protected void	unbindConfigurationAdmin(org.osgi.service.cm.ConfigurationAdmin configurationAdmin)
void	unbindParsingProvider(ParsingProvider provider) Unregister a parsing provider

Methods inherited from class java.lang.Object

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

Constructor Detail

Parser

public Parser()

the constructor sets the singleton instance to allow instantiation by OSGi-DS. This constructor should not be called except by OSGi-DS, otherwise the static getInstance method should be used.

Method Detail

getInstance

public static Parser getInstance()

This returns the singleton instance, if an instance has been previously created (e.g. by OSGi declarative services) this instance is returned, otherwise a new instance is created and providers are injected using the service provider interface (META-INF/services/)

Returns:

the singleton Parser instance

activate

protected void activate(org.osgi.service.component.ComponentContext componentContext)

deactivate

protected void deactivate(org.osgi.service.component.ComponentContext componentContext)

parse

public Graph parse(InputStream serializedGraph,
          String formatIdentifier)
            throws UnsupportedFormatException

Parses a serialized Graph from an InputStream. This delegates the processing to the provider registered for the specified format, if the formatIdentifier contains a ';'-character only the section before that character is used for choosing the provider.

Parameters:

serializedGraph - an inputstream with the serialization

formatIdentifier - a string identifying the format (usually the MIME-type)

Returns:

the graph read from the stream

Throws:

UnsupportedFormatException

parse

public void parse(MGraph target,
         InputStream serializedGraph,
         String formatIdentifier)
           throws UnsupportedFormatException

Parses a serialized Graph from an InputStream. This delegates the processing to the provider registered for the specified format, if the formatIdentifier contains a ';'-character only the section before that character is used for choosing the provider.

Parameters:

target - the MGraph to which the parsed triples are added

serializedGraph - an inputstream with the serialization

formatIdentifier - a string identifying the format (usually the MIME-type)

Throws:

UnsupportedFormatException

parse

public Graph parse(InputStream serializedGraph,
          String formatIdentifier,
          UriRef baseUri)
            throws UnsupportedFormatException

Parses a serialized Graph from an InputStream. This delegates the processing to the provider registered for the specified format, if the formatIdentifier contains a ';'-character only the section before that character is used for choosing the provider.

Parameters:

serializedGraph - an inputstream with the serialization

formatIdentifier - a string identifying the format (usually the MIME-type)

baseUri - the uri against which relative uri-refs are evaluated

Returns:

the graph read from the stream

Throws:

UnsupportedFormatException

parse

public void parse(MGraph target,
         InputStream serializedGraph,
         String formatIdentifier,
         UriRef baseUri)
           throws UnsupportedFormatException

Parses a serialized Graph from an InputStream. This delegates the processing to the provider registered for the specified format, if the formatIdentifier contains a ';'-character only the section before that character is used for choosing the provider.

Parameters:

target - the MGraph to which the parsed triples are added

serializedGraph - an inputstream with the serialization

formatIdentifier - a string identifying the format (usually the MIME-type)

baseUri - the uri against which relative uri-refs are evaluated

Throws:

UnsupportedFormatException

getSupportedFormats

public Set<String> getSupportedFormats()

Get a set of supported formats

Returns:

a set if stings identifying formats (usually the MIME-type)

bindParsingProvider

public void bindParsingProvider(ParsingProvider provider)

Registers a parsing provider

Parameters:

provider - the provider to be registered

unbindParsingProvider

public void unbindParsingProvider(ParsingProvider provider)

Unregister a parsing provider

Parameters:

provider - the provider to be deregistered

bindConfigurationAdmin

protected void bindConfigurationAdmin(org.osgi.service.cm.ConfigurationAdmin configurationAdmin)

unbindConfigurationAdmin

protected void unbindConfigurationAdmin(org.osgi.service.cm.ConfigurationAdmin configurationAdmin)