org.h2.mvstore.type

类 ObjectDataType

java.lang.Object

org.h2.mvstore.type.ObjectDataType

所有已实现的接口:

DataType

public class ObjectDataType
extends Object
implements DataType

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

构造器概要

构造器

构造器和说明
ObjectDataType()

方法概要

限定符和类型	方法和说明
int	compare(Object a, Object b) Compare two keys.
static int	compareNotNull(byte[] data1, byte[] data2) Compare the contents of two byte arrays.
static Object	deserialize(byte[] data) De-serialize the byte array to an object.
int	getMemory(Object obj) Estimate the used memory in bytes.
Object	read(ByteBuffer buff) Read an object.
void	read(ByteBuffer buff, Object[] obj, int len, boolean key) Read a list of objects.
static byte[]	serialize(Object obj) Serialize the object to a byte array.
void	write(WriteBuffer buff, Object obj) Write an object.
void	write(WriteBuffer buff, Object[] obj, int len, boolean key) Write a list of objects.

从类继承的方法 java.lang.Object

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

构造器详细资料

ObjectDataType

public ObjectDataType()

方法详细资料

compare

public int compare(Object a,
                   Object b)

从接口复制的说明: DataType

Compare two keys.

指定者:

compare 在接口中 DataType

参数:

a - the first key

b - the second key

返回:

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

getMemory

public int getMemory(Object obj)

从接口复制的说明: DataType

Estimate the used memory in bytes.

指定者:

getMemory 在接口中 DataType

参数:

obj - the object

返回:

the used memory

read

public void read(ByteBuffer buff,
                 Object[] obj,
                 int len,
                 boolean key)

从接口复制的说明: DataType

Read a list of objects.

指定者:

read 在接口中 DataType

参数:

buff - the target buffer

obj - the objects

len - the number of objects to read

key - whether the objects are keys

write

public void write(WriteBuffer buff,
                  Object[] obj,
                  int len,
                  boolean key)

从接口复制的说明: DataType

Write a list of objects.

指定者:

write 在接口中 DataType

参数:

buff - the target buffer

obj - the objects

len - the number of objects to write

key - whether the objects are keys

write

public void write(WriteBuffer buff,
                  Object obj)

从接口复制的说明: DataType

Write an object.

指定者:

write 在接口中 DataType

参数:

buff - the target buffer

obj - the value

read

public Object read(ByteBuffer buff)

从接口复制的说明: DataType

Read an object.

指定者:

read 在接口中 DataType

参数:

buff - the source buffer

返回:

the object

serialize

public static byte[] serialize(Object obj)

Serialize the object to a byte array.

参数:

obj - the object to serialize

返回:

the byte array

deserialize

public static Object deserialize(byte[] data)

De-serialize the byte array to an object.

参数:

data - the byte array

返回:

the object

compareNotNull

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

Compare the contents of two byte arrays. If the content or length of the first array is smaller than the second array, -1 is returned. If the content or length of the second array is smaller than the first array, 1 is returned. If the contents and lengths are the same, 0 is returned.

This method interprets bytes as unsigned.

参数:

data1 - the first byte array (must not be null)

data2 - the second byte array (must not be null)

返回:

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