org.semwebtech.util
Class ParseRDF

java.lang.Object
  org.semwebtech.util.ParseRDF

public class ParseRDF
extends java.lang.Object

Tool for handling rdf-data. It is possible to - transform rdf-data from one language to another - use SPARQL-Queries on given rdf-data - print a class-tree

Author:

Franz Schenk

Field Summary

(package private) static java.lang.String[]	allowedOutputFormatters string array containing all accepted result formats
(package private) static boolean	classtree default value for output of classtree
(package private) static java.lang.String	commentString String that is recognized as start of comment Note, that # is also used by the arq-module as a character introducing comments.
(package private) static java.lang.String	defaultNS default Namespace that is used when none is given in the document or the query
(package private) static boolean	inferenceSupport default value for query support
(package private) static java.util.Vector<java.lang.String>	inputFile vector containing all inputfilenames
(package private) static java.lang.String	inputFileDefault default value for inputfilename
(package private) static java.lang.String	inputLanguage default value for input language
(package private) static java.lang.String[]	knownInputLanguages string array containing all accepted input languages
(package private) static java.lang.String[]	knownOutputLanguages string array containing all accepted output languages
(package private) static org.apache.log4j.Logger	logger log4j Logger Object
(package private) static java.lang.String	outputFile default value for outputfilename
(package private) static java.lang.String	outputLanguage Default Value for output language
(package private) static java.lang.String	packageFormat Package format gives a hint where to look for a log4j configuration
(package private) static java.lang.String	prettyPrint Query Result Output Format (aka pretty printing)
(package private) static java.lang.String	queryFile default value for queryfilename
(package private) static java.lang.String	reasonerAddress default value for reasoner address
(package private) static java.lang.String	ruleFile RuleFileName

Constructor Summary

ParseRDF()

Method Summary

private static java.lang.String	arrayToString(java.lang.String[] stringarray, java.lang.String delimiter) return a string composed of elements of given array, each delimited by given string
private static boolean	checkLanguage(java.lang.String givenLanguage, java.lang.String[] knownLanguages) check if a given language is supported as input or output language
private static void	executeSPARQLQuery() Execute a SPARQL-Query
private static boolean	formattedResultsOutput(com.hp.hpl.jena.query.ResultSet results) Output of a SPARQL Query ResultSet.
static java.lang.String	guessLanguage(java.io.BufferedReader br) Try to guess what language the document that the stream points to is.
static java.lang.String	guessLanguage(java.lang.String modelString) Try to guess a model string's language
static java.util.Properties	loadConfiguration() Load a log4j Properties File.
static void	main(java.lang.String[] args)
private static void	outputModel(com.hp.hpl.jena.rdf.model.Model model)
private static java.lang.String	parseAddress(java.lang.String address) add protocol 'file:' to address-string if no protocol is given.
private static java.lang.String	parseQuery(java.lang.String queryString) Helper function to parse a query, remove all FROM-clauses (except the FROM NAMED clause) and add the URI's/Filenames that are given with the FROM clause to the list of input Filenames
private static com.hp.hpl.jena.rdf.model.Model	prepareModel() Create a Model.
private static void	printClassTree() uses a built-in function of the pellet knowledgebase-class, that gives the class tree of the actual graph (that the knowledgebase is equivalent to
private static void	printHelp() Print out a help message on how to use this program.
private static com.hp.hpl.jena.rdf.model.Model	readFileIntoModel(java.lang.String inputFileName) Load data from file/http into a rdf-Model
private static java.lang.String	readFileIntoString(java.lang.String filename) Load a given (text) File into a String (ignoring lines starting with #) Needed for SPARQL-queries with a FROM clause.
private static void	translateDataFile() Transform a given file containing rdf-data from one language to another First load a model, then pass it on to the output-function.

Methods inherited from class java.lang.Object

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

Field Detail

defaultNS

static final java.lang.String defaultNS

default Namespace that is used when none is given in the document or the query

See Also:

Constant Field Values

knownInputLanguages

static final java.lang.String[] knownInputLanguages

string array containing all accepted input languages

knownOutputLanguages

static final java.lang.String[] knownOutputLanguages

string array containing all accepted output languages

allowedOutputFormatters

static final java.lang.String[] allowedOutputFormatters

string array containing all accepted result formats

inputLanguage

static java.lang.String inputLanguage

default value for input language

outputLanguage

static java.lang.String outputLanguage

Default Value for output language

inputFileDefault

static java.lang.String inputFileDefault

default value for inputfilename

outputFile

static java.lang.String outputFile

default value for outputfilename

ruleFile

static java.lang.String ruleFile

RuleFileName

queryFile

static java.lang.String queryFile

default value for queryfilename

inferenceSupport

static boolean inferenceSupport

default value for query support

reasonerAddress

static java.lang.String reasonerAddress

default value for reasoner address

inputFile

static java.util.Vector<java.lang.String> inputFile

vector containing all inputfilenames

logger

static org.apache.log4j.Logger logger

log4j Logger Object

prettyPrint

static java.lang.String prettyPrint

Query Result Output Format (aka pretty printing)

packageFormat

static java.lang.String packageFormat

Package format gives a hint where to look for a log4j configuration

commentString

static java.lang.String commentString

String that is recognized as start of comment Note, that # is also used by the arq-module as a character introducing comments.

classtree

static boolean classtree

default value for output of classtree

Constructor Detail

ParseRDF

public ParseRDF()

Method Detail

main

public static void main(java.lang.String[] args)

translateDataFile

private static void translateDataFile()

Transform a given file containing rdf-data from one language to another First load a model, then pass it on to the output-function.

outputModel

private static void outputModel(com.hp.hpl.jena.rdf.model.Model model)

printClassTree

private static void printClassTree()

uses a built-in function of the pellet knowledgebase-class, that gives the class tree of the actual graph (that the knowledgebase is equivalent to

checkLanguage

private static boolean checkLanguage(java.lang.String givenLanguage,
                                     java.lang.String[] knownLanguages)

check if a given language is supported as input or output language

prepareModel

private static com.hp.hpl.jena.rdf.model.Model prepareModel()

Create a Model. Depending on the Parameters passed by the user either a model without inference support or a model backed by an internal / external reasoner is created.

Returns:

Model

readFileIntoModel

private static com.hp.hpl.jena.rdf.model.Model readFileIntoModel(java.lang.String inputFileName)

Load data from file/http into a rdf-Model

Parameters:

inputFileName -

inputLanguage -

Returns:

Model

readFileIntoString

private static java.lang.String readFileIntoString(java.lang.String filename)

Load a given (text) File into a String (ignoring lines starting with #) Needed for SPARQL-queries with a FROM clause.

Parameters:

filename -

Returns:

querystring

executeSPARQLQuery

private static void executeSPARQLQuery()

Execute a SPARQL-Query

arrayToString

private static java.lang.String arrayToString(java.lang.String[] stringarray,
                                              java.lang.String delimiter)

return a string composed of elements of given array, each delimited by given string

parseAddress

private static java.lang.String parseAddress(java.lang.String address)

add protocol 'file:' to address-string if no protocol is given.

parseQuery

private static java.lang.String parseQuery(java.lang.String queryString)

Helper function to parse a query, remove all FROM-clauses (except the FROM NAMED clause) and add the URI's/Filenames that are given with the FROM clause to the list of input Filenames

Parameters:

queryString -

Returns:

String

loadConfiguration

public static java.util.Properties loadConfiguration()

Load a log4j Properties File. The name of the File to be loaded is 'log4j.properties'. The location is within the same directory as this classfile. The intention is to be able to load a config-file inside the jar.

Returns:

Properties

formattedResultsOutput

private static boolean formattedResultsOutput(com.hp.hpl.jena.query.ResultSet results)

Output of a SPARQL Query ResultSet. Default method is a plain text table containing variable bindings. Other possibilities are RDF, XML.

Parameters:

results -

Returns:

boolean

printHelp

private static void printHelp()

Print out a help message on how to use this program.

guessLanguage

public static java.lang.String guessLanguage(java.lang.String modelString)

Try to guess a model string's language

Parameters:

modelString - the model string

Returns:

the language

guessLanguage

public static java.lang.String guessLanguage(java.io.BufferedReader br)

Try to guess what language the document that the stream points to is. Read from that stream until language could be determined or until end of stream.

Parameters:

br -