org.h2.mvstore.type

类 ObjectDataType

java.lang.Object

org.h2.mvstore.type.BasicDataType<Object>

org.h2.mvstore.type.ObjectDataType

所有已实现的接口:

Comparator<Object>, DataType<Object>

public class ObjectDataType
extends BasicDataType<Object>

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.
Object[]	createStorage(int size) Create storage object of array type to hold values
static Object	deserialize(byte[] data) De-serialize the byte array to an object.
int	getMemory(Object obj) Calculates the amount of used memory in bytes.
Object	read(ByteBuffer buff) Read an object.
static byte[]	serialize(Object obj) Serialize the object to a byte array.
void	write(WriteBuffer buff, Object obj) Write an object.

从类继承的方法 org.h2.mvstore.type.BasicDataType

binarySearch, cast, equals, hashCode, isMemoryEstimationAllowed, read, write

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

构造器详细资料

ObjectDataType

public ObjectDataType()

方法详细资料

createStorage

public Object[] createStorage(int size)

从接口复制的说明: DataType

Create storage object of array type to hold values

参数:

size - number of values to hold

返回:

storage object

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 Comparator<Object>

指定者:

compare 在接口中 DataType<Object>

覆盖:

compare 在类中 BasicDataType<Object>

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

Calculates the amount of used memory in bytes.

指定者:

getMemory 在接口中 DataType<Object>

指定者:

getMemory 在类中 BasicDataType<Object>

参数:

obj - the object

返回:

the used memory

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<Object>

指定者:

write 在类中 BasicDataType<Object>

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<Object>

指定者:

read 在类中 BasicDataType<Object>

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)