com.epimorphics.json

Class RDFJSONModWriter

java.lang.Object

com.epimorphics.json.RDFJSONModWriter

public class RDFJSONModWriter
extends Object

Support for serializing sets of RDF resources and whole models in JSON.

In lieu of the W3C standard we are mostly following the Talis format. Unfortunately that doesn't cater for lists in a usable fashion and our primary use case is outputting lists of results. So we extend the Talis format with a value type "list" which is rendered in JSON as an array.

Author:

Dave Reynolds

Field Summary

Fields

Modifier and Type	Field and Description
protected Set<com.hp.hpl.jena.graph.Node>	visited
protected org.apache.jena.atlas.json.io.JSWriter	writer

Constructor Summary

Constructors

Constructor and Description
RDFJSONModWriter(OutputStream out)

Method Summary

Methods

Modifier and Type	Method and Description
void	finish() Finish the write.
protected boolean	isListNode(com.hp.hpl.jena.graph.Graph g, com.hp.hpl.jena.graph.Node n)
protected String	nodeLabel(com.hp.hpl.jena.graph.Node node)
protected void	start()
void	write(com.hp.hpl.jena.graph.Graph graph) Write the given graph, not including a resources that have already been visited
void	write(com.hp.hpl.jena.rdf.model.Model model) Write the given model, not including a resources that have already been visited
void	write(com.hp.hpl.jena.rdf.model.Resource root, com.hp.hpl.jena.rdf.model.Resource page, Iterable<com.hp.hpl.jena.rdf.model.Resource> items) Write the given ResultPage out with a wrapper object round the graph data showing the root, page and results list.
protected void	writeKeyValue(String key, long value)
protected void	writeKeyValue(String key, String value)
protected void	writeLiteral(com.hp.hpl.jena.graph.impl.LiteralLabel literal, boolean isFirst)
protected void	writeNodeValue(com.hp.hpl.jena.graph.Graph graph, com.hp.hpl.jena.graph.Node node, boolean isFirst)
void	writeResource(com.hp.hpl.jena.graph.Graph graph, com.hp.hpl.jena.graph.Node node, boolean recordVisit) Write a single graph node
void	writeResource(com.hp.hpl.jena.rdf.model.Resource resource) Write a single resource

Methods inherited from class java.lang.Object

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

Field Detail

visited

protected Set<com.hp.hpl.jena.graph.Node> visited

writer

protected org.apache.jena.atlas.json.io.JSWriter writer

Constructor Detail

RDFJSONModWriter

public RDFJSONModWriter(OutputStream out)

Method Detail

start

protected void start()

writeResource

public void writeResource(com.hp.hpl.jena.rdf.model.Resource resource)

Write a single resource

writeResource

public void writeResource(com.hp.hpl.jena.graph.Graph graph,
                 com.hp.hpl.jena.graph.Node node,
                 boolean recordVisit)

Write a single graph node

Parameters:

graph - the graph from which to write

node - the specific node to write out properties for

recordVisit - if true then this visit will be record to be blocked from an subsequent full write

writeNodeValue

protected void writeNodeValue(com.hp.hpl.jena.graph.Graph graph,
                  com.hp.hpl.jena.graph.Node node,
                  boolean isFirst)

writeLiteral

protected void writeLiteral(com.hp.hpl.jena.graph.impl.LiteralLabel literal,
                boolean isFirst)

isListNode

protected boolean isListNode(com.hp.hpl.jena.graph.Graph g,
                 com.hp.hpl.jena.graph.Node n)

writeKeyValue

protected void writeKeyValue(String key,
                 String value)

writeKeyValue

protected void writeKeyValue(String key,
                 long value)

nodeLabel

protected String nodeLabel(com.hp.hpl.jena.graph.Node node)

write

public void write(com.hp.hpl.jena.rdf.model.Model model)

Write the given model, not including a resources that have already been visited

write

public void write(com.hp.hpl.jena.graph.Graph graph)

Write the given graph, not including a resources that have already been visited

write

public void write(com.hp.hpl.jena.rdf.model.Resource root,
         com.hp.hpl.jena.rdf.model.Resource page,
         Iterable<com.hp.hpl.jena.rdf.model.Resource> items)

Write the given ResultPage out with a wrapper object round the graph data showing the root, page and results list.

finish

public void finish()

Finish the write. Not called "close" because it doesn't not close the underlying output stream.