com.hp.hpl.jena.sparql.resultset
Class JSONInputIterator

java.lang.Object
  com.hp.hpl.jena.sparql.util.PrintSerializableBase
      com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase
          com.hp.hpl.jena.sparql.resultset.JSONInputIterator

All Implemented Interfaces:

QueryIterator, PrintSerializable, Iterator<Binding>, Printable, Closeable

public class JSONInputIterator
extends QueryIteratorBase

Streaming Iterator over SPARQL JSON results, not yet fully implemented (see JENA-267)

Creating the Iterator automatically causes it to parse a small chunk of the stream to determine the variables in the result set either by reading the header or reading some portion of the results if the results appear before the header since JSON does not guarantee the order of keys within an object

Field Summary

Fields inherited from class com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase

traceIterators

Constructor Summary

JSONInputIterator(InputStream input)
Creates a SPARQL JSON Iterator

Method Summary

Iterator<String>	getVars() Returns the variables present in the result sets
boolean	isBooleanResult() Gets whether the SPARQL JSON represents a boolean result set
void	output(IndentedWriter out, SerializationContext sCxt)

Methods inherited from class com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase

cancel, close, debug, hasNext, next, nextBinding, remove

Methods inherited from class com.hp.hpl.jena.sparql.util.PrintSerializableBase

output, toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.hp.hpl.jena.sparql.util.PrintSerializable

toString

Methods inherited from interface org.apache.jena.atlas.io.Printable

output

Constructor Detail

JSONInputIterator

public JSONInputIterator(InputStream input)

Creates a SPARQL JSON Iterator

Automatically parses some portion of the input to determine the variables in use

Method Detail

getVars

public Iterator<String> getVars()

Returns the variables present in the result sets

isBooleanResult

public boolean isBooleanResult()

Gets whether the SPARQL JSON represents a boolean result set

output

public void output(IndentedWriter out,
                   SerializationContext sCxt)