org.openanzo.utils
Class GraphUtils

java.lang.Object
  org.openanzo.utils.GraphUtils

public class GraphUtils
extends java.lang.Object

Set of utility methods for graph operations, mainly dealing with reading and writing data.

Author:

Matthew Roy ( mroy@cambridgesemantics.com )

Constructor Summary

GraphUtils()

Method Summary

static void	addGraph(INamedGraph dest, INamedGraph src) Add all statements from src graph to destination graph
static java.lang.Iterable<org.openrdf.model.Statement>	getCollectionMembers(org.openrdf.model.Resource list, IDataset dataset) Get an Iterable for the members of the RDFList construct provided
static java.lang.Iterable<org.openrdf.model.Value>	getCollectionMembers(org.openrdf.model.Resource list, INamedGraph graph) Get an Iterable for the members of the RDFList construct provided
static java.lang.Iterable<org.openrdf.model.Statement>	getContainerMembers(org.openrdf.model.Resource container, IDataset dataset) Get an Iterable for the members of the RDFContainer construct provided
static java.lang.Iterable<org.openrdf.model.Value>	getContainerMembers(org.openrdf.model.Resource container, INamedGraph graph) Get an Iterable for the members of the RDFContainer construct provided
static java.lang.String	graphToString(INamedGraph graph) Write the contents of the graph to a string in RDFXML format
static void	loadDataset(IDataset dataset, java.io.InputStream rdf, org.openrdf.rio.RDFFormat format, java.lang.String baseURI, int batchSize) Load the contents of an input stream into the given dataset.
static void	loadGraph(INamedGraph graph, java.io.File file) Load data from given file into a graph.
static void	loadGraph(INamedGraph graph, java.io.InputStream rdf, org.openrdf.rio.RDFFormat format, java.lang.String baseURI) Load the contents of an input stream into given graph, using parser for given format
static void	loadGraph(INamedGraph graph, java.io.InputStream rdf, org.openrdf.rio.RDFFormat format, java.lang.String baseURI, int batchSize) Load the contents of an input stream into given graph, using parser for given format,batching additions into chunks of given size
static void	loadGraph(INamedGraph graph, java.lang.String rdf, org.openrdf.rio.RDFFormat format) Load the contents of string into given graph, using parser for given format
static void	loadGraphInDataset(IDataset dataset, org.openrdf.model.URI namedGraphURI, java.io.InputStream rdf, org.openrdf.rio.RDFFormat format, java.lang.String baseURI) Load the contents of an input stream into a graph with the given URI which is a member of the given dataset.
static void	loadGraphInDataset(IDataset dataset, org.openrdf.model.URI namedGraphURI, java.io.InputStream rdf, org.openrdf.rio.RDFFormat format, java.lang.String baseURI, int batchSize) Load the contents of an input stream into a graph with the given URI which is a member of the given dataset.
static void	writeDataset(IDataset dataset, java.io.OutputStream out) Write the contents of the given Dataset's NamedGraphs to the given OutputStream, using TriG Note:Default graph data is not written
static void	writeGraph(INamedGraph graph, java.io.OutputStream out) Write the contents of the given named graph to the given OutputStream, using RDFXML
static void	writeGraph(INamedGraph graph, java.io.Writer writer) Write the contents of the given named graph to the given writer, using RDFXML

Methods inherited from class java.lang.Object

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

Constructor Detail

GraphUtils

public GraphUtils()

Method Detail

writeGraph

public static void writeGraph(INamedGraph graph,
                              java.io.Writer writer)
                       throws org.openrdf.rio.RDFHandlerException

Write the contents of the given named graph to the given writer, using RDFXML

Parameters:

graph - Graph to write

writer - Writer to which data is written

Throws:

org.openrdf.rio.RDFHandlerException - if there are exceptions writing the data

writeGraph

public static void writeGraph(INamedGraph graph,
                              java.io.OutputStream out)
                       throws org.openrdf.rio.RDFHandlerException

Write the contents of the given named graph to the given OutputStream, using RDFXML

Parameters:

graph - Graph to write

out - OutputStream to which data is written

Throws:

org.openrdf.rio.RDFHandlerException - if there are exceptions writing the data

writeDataset

public static void writeDataset(IDataset dataset,
                                java.io.OutputStream out)
                         throws org.openrdf.rio.RDFHandlerException

Write the contents of the given Dataset's NamedGraphs to the given OutputStream, using TriG Note:Default graph data is not written

Parameters:

dataset - Graph to write

out - OutputStream to which data is written

Throws:

org.openrdf.rio.RDFHandlerException - if there are exceptions writing the data

graphToString

public static java.lang.String graphToString(INamedGraph graph)
                                      throws java.lang.Exception

Write the contents of the graph to a string in RDFXML format

Parameters:

graph - Graph to write

Returns:

String containing contents of graph in RDFXML

Throws:

java.lang.Exception

loadGraph

public static void loadGraph(INamedGraph graph,
                             java.io.File file)
                      throws java.lang.Exception

Load data from given file into a graph.

Parameters:

graph - Graph to which data is loaded

file - File containing graph data.

Throws:

java.lang.Exception - if there is an error parsing data

loadGraph

public static void loadGraph(INamedGraph graph,
                             java.io.InputStream rdf,
                             org.openrdf.rio.RDFFormat format,
                             java.lang.String baseURI)
                      throws java.lang.Exception

Load the contents of an input stream into given graph, using parser for given format

Parameters:

graph - Graph to which data is loaded

rdf - InputStream containing data

format - Format which data is stored

baseURI - BaseURI of data within stream

Throws:

java.lang.Exception - if there is an error parsing data

loadGraph

public static void loadGraph(INamedGraph graph,
                             java.io.InputStream rdf,
                             org.openrdf.rio.RDFFormat format,
                             java.lang.String baseURI,
                             int batchSize)
                      throws java.lang.Exception

Load the contents of an input stream into given graph, using parser for given format,batching additions into chunks of given size

Parameters:

graph - Graph to which data is loaded

rdf - InputStream containing data

format - Format which data is stored

baseURI - BaseURI of data within stream

batchSize - Size of chunks used during data loading

Throws:

java.lang.Exception - if there is an error parsing data

loadGraph

public static void loadGraph(INamedGraph graph,
                             java.lang.String rdf,
                             org.openrdf.rio.RDFFormat format)
                      throws java.lang.Exception

Load the contents of string into given graph, using parser for given format

Parameters:

graph - Graph to which data is loaded

rdf - String containing data

format - Format which data is stored

Throws:

java.lang.Exception - if there is an error parsing data

loadGraphInDataset

public static void loadGraphInDataset(IDataset dataset,
                                      org.openrdf.model.URI namedGraphURI,
                                      java.io.InputStream rdf,
                                      org.openrdf.rio.RDFFormat format,
                                      java.lang.String baseURI)
                               throws java.lang.Exception

Load the contents of an input stream into a graph with the given URI which is a member of the given dataset. Use parser for given format

Parameters:

dataset - Dataset which contains given NamedGraph

namedGraphURI - URI of graph to which data is loaded

rdf - InputStream containing data

format - Format which data is stored

baseURI - BaseURI of data within stream

Throws:

java.lang.Exception - if there is an error parsing data

loadGraphInDataset

public static void loadGraphInDataset(IDataset dataset,
                                      org.openrdf.model.URI namedGraphURI,
                                      java.io.InputStream rdf,
                                      org.openrdf.rio.RDFFormat format,
                                      java.lang.String baseURI,
                                      int batchSize)
                               throws java.lang.Exception

Load the contents of an input stream into a graph with the given URI which is a member of the given dataset. Use parser for given format,batching additions into chunks of given size

Parameters:

dataset - Dataset which contains given NamedGraph

namedGraphURI - URI of graph to which data is loaded

rdf - InputStream containing data

format - Format which data is stored

baseURI - BaseURI of data within stream

batchSize - Size of chunks used during data loading

Throws:

java.lang.Exception - if there is an error parsing data

loadDataset

public static void loadDataset(IDataset dataset,
                               java.io.InputStream rdf,
                               org.openrdf.rio.RDFFormat format,
                               java.lang.String baseURI,
                               int batchSize)
                        throws java.lang.Exception

Load the contents of an input stream into the given dataset. Use parser for given format,batching additions into chunks of given size

Parameters:

dataset - Dataset to which data is loaded

rdf - InputStream containing data

format - Format which data is stored

baseURI - BaseURI of data within stream

batchSize - Size of chunks used during data loading

Throws:

java.lang.Exception - if there is an error parsing data

addGraph

public static void addGraph(INamedGraph dest,
                            INamedGraph src)

Add all statements from src graph to destination graph

Parameters:

dest - Graph to which statements are added

src - Graph from which statements are added

getContainerMembers

public static java.lang.Iterable<org.openrdf.model.Value> getContainerMembers(org.openrdf.model.Resource container,
                                                                              INamedGraph graph)

Get an Iterable for the members of the RDFContainer construct provided

Parameters:

container - Resource of RDFContainer object

graph - Graph containing data

Returns:

Iterable containing data contained within RDFContainer

getContainerMembers

public static java.lang.Iterable<org.openrdf.model.Statement> getContainerMembers(org.openrdf.model.Resource container,
                                                                                  IDataset dataset)

Get an Iterable for the members of the RDFContainer construct provided

Parameters:

container - Resource of RDFContainer object

dataset - Dataset containing data

Returns:

Iterable containing data contained within RDFContainer

getCollectionMembers

public static java.lang.Iterable<org.openrdf.model.Value> getCollectionMembers(org.openrdf.model.Resource list,
                                                                               INamedGraph graph)

Get an Iterable for the members of the RDFList construct provided

Parameters:

list - Resource of RDFList object

graph - Graph containing data

Returns:

Iterable containing data contained within RDFContainer

getCollectionMembers

public static java.lang.Iterable<org.openrdf.model.Statement> getCollectionMembers(org.openrdf.model.Resource list,
                                                                                   IDataset dataset)

Get an Iterable for the members of the RDFList construct provided

Parameters:

list - Resource of RDFList object

dataset - Dataset containing data

Returns:

Iterable containing data contained within RDFContainer