JsonEncoder (Apache Avro Java 1.10.0 API)

java.lang.Object
- org.apache.avro.io.Encoder
- - org.apache.avro.io.ParsingEncoder
  - - org.apache.avro.io.JsonEncoder

All Implemented Interfaces:

Flushable, Parser.ActionHandler
```
public class JsonEncoder
extends ParsingEncoder
implements Parser.ActionHandler
```
An Encoder for Avro's JSON data encoding.
Construct using EncoderFactory.
JsonEncoder buffers output, and data may not appear on the output until Flushable.flush() is called.
JsonEncoder is not thread-safe.

Field Summary

Fields
Modifier and Type Field and Description

protected BitSet isEmpty
Has anything been written into the collections?
- Fields inherited from class org.apache.avro.io.ParsingEncoder
  pos

Fields
Modifier and Type	Field and Description
`protected BitSet`	`isEmpty` Has anything been written into the collections?

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`JsonEncoder`	`configure(OutputStream out)` Reconfigures this JsonEncoder to use the output stream provided.
`Symbol`	`doAction(Symbol input, Symbol top)` Handle the action symbol `top` when the `input` is sought to be taken off the stack.
`void`	`flush()`
`boolean`	`isIncludeNamespace()`
`void`	`setIncludeNamespace(boolean includeNamespace)`
`void`	`startItem()` Start a new item of an array or map.
`void`	`writeArrayEnd()` Call this method to finish writing an array.
`void`	`writeArrayStart()` Call this method to start writing an array.
`void`	`writeBoolean(boolean b)` Write a boolean value.
`void`	`writeBytes(byte[] bytes, int start, int len)` Write a byte string.
`void`	`writeBytes(ByteBuffer bytes)` Write a byte string.
`void`	`writeDouble(double d)` Write a double.
`void`	`writeEnum(int e)` Writes an enumeration.
`void`	`writeFixed(byte[] bytes, int start, int len)` Writes a fixed size binary object.
`void`	`writeFloat(float f)` Write a float.
`void`	`writeIndex(int unionIndex)` Call this method to write the tag of a union.
`void`	`writeInt(int n)` Writes a 32-bit integer.
`void`	`writeLong(long n)` Write a 64-bit integer.
`void`	`writeMapEnd()` Call this method to terminate the inner-most, currently-opened map.
`void`	`writeMapStart()` Call this to start a new map.
`void`	`writeNull()` "Writes" a null value.
`void`	`writeString(String str)` Write a Unicode character string.
`void`	`writeString(Utf8 utf8)` Write a Unicode character string.

Methods inherited from class org.apache.avro.io.ParsingEncoder
depth, pop, push, setItemCount

Methods inherited from class org.apache.avro.io.Encoder
writeBytes, writeFixed, writeFixed, writeString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - isEmpty
```
protected BitSet isEmpty
```
    Has anything been written into the collections?
- Method Detail
  - flush
```
public void flush()
           throws IOException
```
    Specified by:
    
    flush in interface Flushable
    
    Throws:
    
    IOException
  - isIncludeNamespace
```
public boolean isIncludeNamespace()
```
  - setIncludeNamespace
```
public void setIncludeNamespace(boolean includeNamespace)
```
  - configure
```
public JsonEncoder configure(OutputStream out)
                      throws IOException
```
    Reconfigures this JsonEncoder to use the output stream provided.
    If the OutputStream provided is null, a NullPointerException is thrown.
    Otherwise, this JsonEncoder will flush its current output and then reconfigure its output to use a default UTF8 JsonGenerator that writes to the provided OutputStream.
    
    Parameters:
    
    out - The OutputStream to direct output to. Cannot be null.
    
    Returns:
    
    this JsonEncoder
    
    Throws:
    
    IOException
    
    NullPointerException - if out is null
  - writeNull
```
public void writeNull()
               throws IOException
```
    Description copied from class: Encoder
    
    "Writes" a null value. (Doesn't actually write anything, but advances the state of the parser if this class is stateful.)
    
    Specified by:
    
    writeNull in class Encoder
    
    Throws:
    
    IOException
  - writeBoolean
```
public void writeBoolean(boolean b)
                  throws IOException
```
    Description copied from class: Encoder
    
    Write a boolean value.
    
    Specified by:
    
    writeBoolean in class Encoder
    
    Throws:
    
    IOException
  - writeInt
```
public void writeInt(int n)
              throws IOException
```
    Description copied from class: Encoder
    
    Writes a 32-bit integer.
    
    Specified by:
    
    writeInt in class Encoder
    
    Throws:
    
    IOException
  - writeLong
```
public void writeLong(long n)
               throws IOException
```
    Description copied from class: Encoder
    
    Write a 64-bit integer.
    
    Specified by:
    
    writeLong in class Encoder
    
    Throws:
    
    IOException
  - writeFloat
```
public void writeFloat(float f)
                throws IOException
```
    Description copied from class: Encoder
    
    Write a float.
    
    Specified by:
    
    writeFloat in class Encoder
    
    Throws:
    
    IOException
  - writeDouble
```
public void writeDouble(double d)
                 throws IOException
```
    Description copied from class: Encoder
    
    Write a double.
    
    Specified by:
    
    writeDouble in class Encoder
    
    Throws:
    
    IOException
  - writeString
```
public void writeString(Utf8 utf8)
                 throws IOException
```
    Description copied from class: Encoder
    
    Write a Unicode character string.
    
    Specified by:
    
    writeString in class Encoder
    
    Throws:
    
    IOException
  - writeString
```
public void writeString(String str)
                 throws IOException
```
    Description copied from class: Encoder
    
    Write a Unicode character string. The default implementation converts the String to a Utf8. Some Encoder implementations may want to do something different as a performance optimization.
    
    Overrides:
    
    writeString in class Encoder
    
    Throws:
    
    IOException
  - writeBytes
```
public void writeBytes(ByteBuffer bytes)
                throws IOException
```
    Description copied from class: Encoder
    
    Write a byte string.
    
    Specified by:
    
    writeBytes in class Encoder
    
    Throws:
    
    IOException
  - writeBytes
```
public void writeBytes(byte[] bytes,
                       int start,
                       int len)
                throws IOException
```
    Description copied from class: Encoder
    
    Write a byte string.
    
    Specified by:
    
    writeBytes in class Encoder
    
    Throws:
    
    IOException
  - writeFixed
```
public void writeFixed(byte[] bytes,
                       int start,
                       int len)
                throws IOException
```
    Description copied from class: Encoder
    
    Writes a fixed size binary object.
    
    Specified by:
    
    writeFixed in class Encoder
    
    Parameters:
    
    bytes - The contents to write
    
    start - The position within bytes where the contents start.
    
    len - The number of bytes to write.
    
    Throws:
    
    IOException
  - writeEnum
```
public void writeEnum(int e)
               throws IOException
```
    Description copied from class: Encoder
    
    Writes an enumeration.
    
    Specified by:
    
    writeEnum in class Encoder
    
    Throws:
    
    IOException
  - writeArrayStart
```
public void writeArrayStart()
                     throws IOException
```
    Description copied from class: Encoder
    Call this method to start writing an array. When starting to serialize an array, call Encoder.writeArrayStart(). Then, before writing any data for any item call Encoder.setItemCount(long) followed by a sequence of Encoder.startItem() and the item itself. The number of Encoder.startItem() should match the number specified in Encoder.setItemCount(long). When actually writing the data of the item, you can call any Encoder method (e.g., Encoder.writeLong(long)). When all items of the array have been written, call Encoder.writeArrayEnd(). As an example, let's say you want to write an array of records, the record consisting of an Long field and a Boolean field. Your code would look something like this:
```
 out.writeArrayStart();
 out.setItemCount(list.size());
 for (Record r : list) {
   out.startItem();
   out.writeLong(r.longField);
   out.writeBoolean(r.boolField);
 }
 out.writeArrayEnd();
 
```
    Specified by:
    
    writeArrayStart in class Encoder
    
    Throws:
    
    IOException
  - writeArrayEnd
```
public void writeArrayEnd()
                   throws IOException
```
    Description copied from class: Encoder
    
    Call this method to finish writing an array. See Encoder.writeArrayStart() for usage information.
    
    Specified by:
    
    writeArrayEnd in class Encoder
    
    Throws:
    
    IOException
  - writeMapStart
```
public void writeMapStart()
                   throws IOException
```
    Description copied from class: Encoder
    Call this to start a new map. See Encoder.writeArrayStart() for details on usage. As an example of usage, let's say you want to write a map of records, the record consisting of an Long field and a Boolean field. Your code would look something like this:
```
 out.writeMapStart();
 out.setItemCount(list.size());
 for (Map.Entry entry : map.entrySet()) {
   out.startItem();
   out.writeString(entry.getKey());
   out.writeLong(entry.getValue().longField);
   out.writeBoolean(entry.getValue().boolField);
 }
 out.writeMapEnd();
 
```
    Specified by:
    
    writeMapStart in class Encoder
    
    Throws:
    
    IOException
  - writeMapEnd
```
public void writeMapEnd()
                 throws IOException
```
    Description copied from class: Encoder
    
    Call this method to terminate the inner-most, currently-opened map. See Encoder.writeArrayStart() for more details.
    
    Specified by:
    
    writeMapEnd in class Encoder
    
    Throws:
    
    IOException
  - startItem
```
public void startItem()
               throws IOException
```
    Description copied from class: Encoder
    
    Start a new item of an array or map. See Encoder.writeArrayStart() for usage information.
    
    Overrides:
    
    startItem in class ParsingEncoder
    
    Throws:
    
    IOException
  - writeIndex
```
public void writeIndex(int unionIndex)
                throws IOException
```
    Description copied from class: Encoder
    Call this method to write the tag of a union. As an example of usage, let's say you want to write a union, whose second branch is a record consisting of an Long field and a Boolean field. Your code would look something like this:
```
 out.writeIndex(1);
 out.writeLong(record.longField);
 out.writeBoolean(record.boolField);
 
```
    Specified by:
    
    writeIndex in class Encoder
    
    Throws:
    
    IOException
  - doAction
```
public Symbol doAction(Symbol input,
                       Symbol top)
                throws IOException
```
    Description copied from interface: Parser.ActionHandler
    
    Handle the action symbol top when the input is sought to be taken off the stack.
    
    Specified by:
    
    doAction in interface Parser.ActionHandler
    
    Parameters:
    
    input - The input symbol from the caller of advance
    
    top - The symbol at the top the stack.
    
    Returns:
    
    null if advance() is to continue processing the stack. If not null the return value will be returned by advance().
    
    Throws:
    
    IOException

Class JsonEncoder

Field Summary

Fields inherited from class org.apache.avro.io.ParsingEncoder

Method Summary

Methods inherited from class org.apache.avro.io.ParsingEncoder

Methods inherited from class org.apache.avro.io.Encoder

Methods inherited from class java.lang.Object

Field Detail

isEmpty

Method Detail

flush

isIncludeNamespace

setIncludeNamespace

configure

writeNull

writeBoolean

writeInt

writeLong

writeFloat

writeDouble

writeString

writeString

writeBytes

writeBytes

writeFixed

writeEnum

writeArrayStart

writeArrayEnd

writeMapStart

writeMapEnd

startItem

writeIndex

doAction