Package 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. The JSON data is parsed in lenient mode, see also JsonReader.setLenient(boolean).

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

Constructor Summary

Constructors

Constructor	Description
JsonStreamParser(Reader reader)
JsonStreamParser(String json)

Method Summary

Modifier and Type	Method	Description
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

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

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 Details

next

public JsonElement next()
                 throws JsonParseException

Returns the next available JsonElement on the reader. Throws a NoSuchElementException if no element is available.

Specified by:

next in interface Iterator<JsonElement>

Returns:

the next available JsonElement on the reader.

Throws:

JsonSyntaxException - if the incoming stream is malformed JSON.

NoSuchElementException - if no JsonElement is available.

JsonParseException

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

Throws:

JsonSyntaxException - if the incoming stream is malformed JSON.

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