org.h2.mvstore.type
Class ObjectType

java.lang.Object
  org.h2.mvstore.type.ObjectType

All Implemented Interfaces:

DataType

public class ObjectType
extends java.lang.Object
implements DataType

A data type implementation for the most common data types, including serializable objects.

Nested Class Summary

class

ObjectType.LongType The type for long objects.

Constructor Summary

ObjectType()

Method Summary

java.lang.String	asString() Get the stable string representation that is used to build this data type.
int	compare(java.lang.Object a, java.lang.Object b) Compare two keys.
static int	compareNotNull(char[] data1, char[] data2) Compare the contents of two arrays.
static int	compareNotNull(int[] data1, int[] data2) Compare the contents of two arrays.
static int	compareNotNull(long[] data1, long[] data2) Compare the contents of two arrays.
int	getMaxLength(java.lang.Object obj) Get the maximum length in bytes used to store an object.
int	getMemory(java.lang.Object obj) Estimate the used memory in bytes.
java.lang.Object	read(java.nio.ByteBuffer buff) Read an object.
void	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

Constructor Detail

ObjectType

public ObjectType()

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

getMaxLength

public int getMaxLength(java.lang.Object obj)

Description copied from interface: DataType

Get the maximum length in bytes used to store an object. In many cases, this method can be faster than calculating the exact length.

Specified by:

getMaxLength in interface DataType

Parameters:

obj - the object

Returns:

the maximum length

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

write

public void 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

read

public java.lang.Object 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

asString

public java.lang.String asString()

Description copied from interface: DataType

Get the stable string representation that is used to build this data type.

To avoid conflict with the default factory, the returned string should start with the package name of the type factory.

Specified by:

asString in interface DataType

Returns:

the string representation

compareNotNull

public static int compareNotNull(char[] data1,
                                 char[] data2)

Compare the contents of two arrays.

Parameters:

data1 - the first array (must not be null)

data2 - the second array (must not be null)

Returns:

the result of the comparison (-1, 1 or 0)

compareNotNull

public static int compareNotNull(int[] data1,
                                 int[] data2)

Compare the contents of two arrays.

Parameters:

data1 - the first array (must not be null)

data2 - the second array (must not be null)

Returns:

the result of the comparison (-1, 1 or 0)

compareNotNull

public static int compareNotNull(long[] data1,
                                 long[] data2)

Compare the contents of two arrays.

Parameters:

data1 - the first array (must not be null)

data2 - the second array (must not be null)

Returns:

the result of the comparison (-1, 1 or 0)