org.apache.tinkerpop.gremlin.structure.io.binary

Class GraphBinaryWriter

java.lang.Object

org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryWriter

public class GraphBinaryWriter
extends Object

Writes a value to a buffer using the TypeSerializer instances configured in the TypeSerializerRegistry.

This class exposes two different methods to write a value to a buffer: write(Object, Buffer) and writeValue(Object, Buffer, boolean):

• write() method writes the binary representation of the {type_code}{type_info}{value_flag}{value} components.
• writeValue() method writes the {value_flag}{value} when a value is nullable and only {value} when a value is not nullable.

Field Summary

Fields

Modifier and Type	Field and Description
static byte	VERSION_BYTE

Constructor Summary

Constructors

Constructor and Description
GraphBinaryWriter()
GraphBinaryWriter(TypeSerializerRegistry registry)

Method Summary

Modifier and Type	Method and Description
<T> void	write(T value, Buffer buffer) Writes an object in fully-qualified format, containing {type_code}{type_info}{value_flag}{value}.
<T> void	writeFullyQualifiedNull(Class<T> objectClass, Buffer buffer, Object information) Represents a null value of a specific type, useful when the parent type contains a type parameter that must be specified.
<T> void	writeValue(T value, Buffer buffer, boolean nullable) Writes a value without including type information.
void	writeValueFlagNone(Buffer buffer) Writes a single byte with value 0, representing an unset value_flag.
void	writeValueFlagNull(Buffer buffer) Writes a single byte representing the null value_flag.

Methods inherited from class java.lang.Object

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

Field Detail

VERSION_BYTE

public static final byte VERSION_BYTE

See Also:

Constant Field Values

Constructor Detail

GraphBinaryWriter

public GraphBinaryWriter()

GraphBinaryWriter

public GraphBinaryWriter(TypeSerializerRegistry registry)

Method Detail

writeValue

public <T> void writeValue(T value,
                           Buffer buffer,
                           boolean nullable)
                    throws IOException

Writes a value without including type information.

Throws:

IOException

write

public <T> void write(T value,
                      Buffer buffer)
               throws IOException

Writes an object in fully-qualified format, containing {type_code}{type_info}{value_flag}{value}.

Throws:

IOException

writeFullyQualifiedNull

public <T> void writeFullyQualifiedNull(Class<T> objectClass,
                                        Buffer buffer,
                                        Object information)
                                 throws IOException

Represents a null value of a specific type, useful when the parent type contains a type parameter that must be specified.

Note that for simple types, the provided information will be null.

Throws:

IOException

writeValueFlagNull

public void writeValueFlagNull(Buffer buffer)

Writes a single byte representing the null value_flag.

writeValueFlagNone

public void writeValueFlagNone(Buffer buffer)

Writes a single byte with value 0, representing an unset value_flag.