org.h2.mvstore.db
Class ValueDataType

java.lang.Object
  org.h2.mvstore.db.ValueDataType

All Implemented Interfaces:

DataType

public class ValueDataType
extends java.lang.Object
implements DataType

A row type.

Method Summary

int	compare(java.lang.Object a, java.lang.Object b) Compare two keys.
int	getMemory(java.lang.Object obj) Estimate the used memory in bytes.
Value	read(java.nio.ByteBuffer buff) Read an object.
java.nio.ByteBuffer	write(java.nio.ByteBuffer buff, java.lang.Object obj) Write the object.

Methods inherited from class java.lang.Object

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

Method Detail

compare

public int compare(java.lang.Object a,
                   java.lang.Object b)

Description copied from interface: DataType

Compare two keys.

Specified by:

compare in interface DataType

Parameters:

a - the first key

b - the second key

Returns:

-1 if the first key is smaller, 1 if larger, and 0 if equal

getMemory

public int getMemory(java.lang.Object obj)

Description copied from interface: DataType

Estimate the used memory in bytes.

Specified by:

getMemory in interface DataType

Parameters:

obj - the object

Returns:

the used memory

read

public Value read(java.nio.ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType

Parameters:

buff - the source buffer

Returns:

the object

write

public java.nio.ByteBuffer write(java.nio.ByteBuffer buff,
                                 java.lang.Object obj)

Description copied from interface: DataType

Write the object.

Specified by:

write in interface DataType

Parameters:

buff - the target buffer

obj - the value

Returns:

the byte buffer