public class JsonEncoder extends ParsingEncoder implements Parser.ActionHandler
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.| Modifier and Type | Field and Description |
|---|---|
protected BitSet |
isEmpty
Has anything been written into the collections?
|
pos| 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.
|
depth, pop, push, setItemCountwriteBytes, writeFixed, writeFixed, writeStringprotected BitSet isEmpty
public void flush()
throws IOException
flush in interface FlushableIOExceptionpublic boolean isIncludeNamespace()
public void setIncludeNamespace(boolean includeNamespace)
public JsonEncoder configure(OutputStream out) throws IOException
out - The OutputStream to direct output to. Cannot be null.IOExceptionNullPointerException - if out is nullpublic void writeNull()
throws IOException
EncoderwriteNull in class EncoderIOExceptionpublic void writeBoolean(boolean b)
throws IOException
EncoderwriteBoolean in class EncoderIOExceptionpublic void writeInt(int n)
throws IOException
EncoderwriteInt in class EncoderIOExceptionpublic void writeLong(long n)
throws IOException
EncoderwriteLong in class EncoderIOExceptionpublic void writeFloat(float f)
throws IOException
EncoderwriteFloat in class EncoderIOExceptionpublic void writeDouble(double d)
throws IOException
EncoderwriteDouble in class EncoderIOExceptionpublic void writeString(Utf8 utf8) throws IOException
EncoderwriteString in class EncoderIOExceptionpublic void writeString(String str) throws IOException
EncoderUtf8. Some Encoder implementations
may want to do something different as a performance optimization.writeString in class EncoderIOExceptionpublic void writeBytes(ByteBuffer bytes) throws IOException
EncoderwriteBytes in class EncoderIOExceptionpublic void writeBytes(byte[] bytes,
int start,
int len)
throws IOException
EncoderwriteBytes in class EncoderIOExceptionpublic void writeFixed(byte[] bytes,
int start,
int len)
throws IOException
EncoderwriteFixed in class Encoderbytes - The contents to writestart - The position within bytes where the contents start.len - The number of bytes to write.IOExceptionpublic void writeEnum(int e)
throws IOException
EncoderwriteEnum in class EncoderIOExceptionpublic void writeArrayStart()
throws IOException
EncoderEncoder.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();
writeArrayStart in class EncoderIOExceptionpublic void writeArrayEnd()
throws IOException
EncoderEncoder.writeArrayStart() for
usage information.writeArrayEnd in class EncoderIOExceptionpublic void writeMapStart()
throws IOException
EncoderEncoder.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.Entryentry : map.entrySet()) { out.startItem(); out.writeString(entry.getKey()); out.writeLong(entry.getValue().longField); out.writeBoolean(entry.getValue().boolField); } out.writeMapEnd();
writeMapStart in class EncoderIOExceptionpublic void writeMapEnd()
throws IOException
EncoderEncoder.writeArrayStart() for more details.writeMapEnd in class EncoderIOExceptionpublic void startItem()
throws IOException
EncoderEncoder.writeArrayStart() for usage
information.startItem in class ParsingEncoderIOExceptionpublic void writeIndex(int unionIndex)
throws IOException
Encoderout.writeIndex(1); out.writeLong(record.longField); out.writeBoolean(record.boolField);
writeIndex in class EncoderIOExceptionpublic Symbol doAction(Symbol input, Symbol top) throws IOException
Parser.ActionHandlerdoAction in interface Parser.ActionHandlerinput - The input symbol from the caller of advancetop - The symbol at the top the stack.IOExceptionCopyright © 2009–2023 The Apache Software Foundation. All rights reserved.