com.google.gson
Class JsonStreamParser

java.lang.Object
  com.google.gson.JsonStreamParser

All Implemented Interfaces:

Iterator<JsonElement>

public final class JsonStreamParser
extends Object
implements Iterator<JsonElement>

A streaming parser that allows reading of multiple JsonElements from the specified reader asynchronously.

This class is conditionally thread-safe (see Item 70, Effective Java second edition). To properly use this class across multiple threads, you will need to add some external synchronization. For example:

 JsonStreamParser parser = new JsonStreamParser("['first'] {'second':10} 'third'");
 JsonElement element;
 synchronized (parser) {  // synchronize on an object shared by threads
   if (parser.hasNext()) {
     element = parser.next();
   }
 }
 

Since:

1.4

Author:

Inderjeet Singh, Joel Leitch

Constructor Summary

JsonStreamParser(Reader reader)

JsonStreamParser(String json)

Method Summary

boolean	hasNext() Returns true if a JsonElement is available on the input for consumption
JsonElement	next() Returns the next available JsonElement on the reader.
void	remove() This optional Iterator method is not relevant for stream parsing and hence is not implemented.

Methods inherited from class java.lang.Object

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

Constructor Detail

JsonStreamParser

public JsonStreamParser(String json)

Parameters:

json - The string containing JSON elements concatenated to each other.

Since:

1.4

JsonStreamParser

public JsonStreamParser(Reader reader)

Parameters:

reader - The data stream containing JSON elements concatenated to each other.

Since:

1.4

Method Detail

next

public JsonElement next()
                 throws JsonParseException

Returns the next available JsonElement on the reader. Null if none available.

Specified by:

next in interface Iterator<JsonElement>

Returns:

the next available JsonElement on the reader. Null if none available.

Throws:

JsonParseException - if the incoming stream is malformed JSON.

Since:

1.4

hasNext

public boolean hasNext()

Returns true if a JsonElement is available on the input for consumption

Specified by:

hasNext in interface Iterator<JsonElement>

Returns:

true if a JsonElement is available on the input, false otherwise

Since:

1.4

remove

public void remove()

This optional Iterator method is not relevant for stream parsing and hence is not implemented.

Specified by:

remove in interface Iterator<JsonElement>

Since:

1.4