JSONInputIterator (Apache Jena ARQ)

java.lang.Object
- org.apache.jena.sparql.util.PrintSerializableBase
- - org.apache.jena.sparql.engine.iterator.QueryIteratorBase
  - - org.apache.jena.riot.resultset.rw.JSONInputIterator

All Implemented Interfaces:

java.util.Iterator<Binding>, org.apache.jena.atlas.io.Printable, org.apache.jena.atlas.lib.Closeable, QueryIterator, PrintSerializable
```
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 org.apache.jena.sparql.engine.iterator.QueryIteratorBase
  traceIterators

Constructor Summary

Constructors
Constructor Description

JSONInputIterator(java.io.InputStream input)
Creates a SPARQL JSON Iterator

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.Iterator<java.lang.String>`	`getVars()`	Returns the variables present in the result sets
`boolean`	`isBooleanResult()`	Gets whether the SPARQL JSON represents a boolean result set
`void`	`output(org.apache.jena.atlas.io.IndentedWriter out, SerializationContext sCxt)`

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIteratorBase
cancel, close, debug, hasNext, next, nextBinding, remove

Methods inherited from class org.apache.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 java.util.Iterator
forEachRemaining

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

Methods inherited from interface org.apache.jena.sparql.util.PrintSerializable
toString

Methods inherited from interface org.apache.jena.sparql.engine.QueryIterator
isJoinIdentity

- Constructor Detail
  - JSONInputIterator
```
public JSONInputIterator(java.io.InputStream input)
```
    Creates a SPARQL JSON Iterator
    Automatically parses some portion of the input to determine the variables in use
- Method Detail
  - getVars
```
public java.util.Iterator<java.lang.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(org.apache.jena.atlas.io.IndentedWriter out,
                   SerializationContext sCxt)
```