Package org.h2.mvstore.type

Class ObjectDataType

java.lang.Object

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

org.h2.mvstore.type.ObjectDataType

All Implemented Interfaces:

java.util.Comparator<java.lang.Object>, DataType<java.lang.Object>

public class ObjectDataType
extends BasicDataType<java.lang.Object>

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	ObjectDataType.AutoDetectDataType<T>	The base class for auto-detect data types.
(package private) static class	ObjectDataType.BigDecimalType	The type for BigDecimal objects.
(package private) static class	ObjectDataType.BigIntegerType	The type for BigInteger objects.
(package private) static class	ObjectDataType.BooleanType	The type for boolean true and false.
(package private) static class	ObjectDataType.ByteType	The type for byte objects.
(package private) static class	ObjectDataType.CharacterType	The type for character objects.
(package private) static class	ObjectDataType.DateType	The type for java.util.Date objects.
(package private) static class	ObjectDataType.DoubleType	The type for double objects.
(package private) static class	ObjectDataType.FloatType	The type for float objects.
private static class	ObjectDataType.Holder
(package private) static class	ObjectDataType.IntegerType	The type for integer objects.
(package private) static class	ObjectDataType.LongType	The type for long objects.
(package private) static class	ObjectDataType.NullType	The type for the null value
(package private) static class	ObjectDataType.ObjectArrayType	The type for object arrays.
(package private) static class	ObjectDataType.SerializedObjectType	The type for serialized objects.
(package private) static class	ObjectDataType.ShortType	The type for short objects.
(package private) static class	ObjectDataType.StringType	The type for string objects.
(package private) static class	ObjectDataType.UUIDType	The type for UUID objects.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static java.lang.Class<?>[]	COMMON_CLASSES
(package private) static long	DOUBLE_ONE_BITS
(package private) static long	DOUBLE_ZERO_BITS
(package private) static int	FLOAT_ONE_BITS
(package private) static int	FLOAT_ZERO_BITS	Constants for floating point synchronization.
private ObjectDataType.AutoDetectDataType<java.lang.Object>	last
(package private) static int	TAG_BIG_DECIMAL_0
(package private) static int	TAG_BIG_DECIMAL_1
(package private) static int	TAG_BIG_DECIMAL_SMALL
(package private) static int	TAG_BIG_DECIMAL_SMALL_SCALED
(package private) static int	TAG_BIG_INTEGER_0
(package private) static int	TAG_BIG_INTEGER_1
(package private) static int	TAG_BIG_INTEGER_SMALL
(package private) static int	TAG_BOOLEAN_TRUE	For very common values (e.g.
(package private) static int	TAG_BYTE_ARRAY_0_15
(package private) static int	TAG_DOUBLE_0
(package private) static int	TAG_DOUBLE_1
(package private) static int	TAG_DOUBLE_FIXED
(package private) static int	TAG_FLOAT_0
(package private) static int	TAG_FLOAT_1
(package private) static int	TAG_FLOAT_FIXED
(package private) static int	TAG_INTEGER_0_15	For small-values/small-arrays, we encode the value/array-length in the tag.
(package private) static int	TAG_INTEGER_FIXED
(package private) static int	TAG_INTEGER_NEGATIVE
(package private) static int	TAG_LONG_0_7
(package private) static int	TAG_LONG_FIXED
(package private) static int	TAG_LONG_NEGATIVE
(package private) static int	TAG_STRING_0_15
(package private) static int	TYPE_ARRAY
(package private) static int	TYPE_BIG_DECIMAL
(package private) static int	TYPE_BIG_INTEGER
(package private) static int	TYPE_BOOLEAN
(package private) static int	TYPE_BYTE
(package private) static int	TYPE_CHAR
(package private) static int	TYPE_DATE
(package private) static int	TYPE_DOUBLE
(package private) static int	TYPE_FLOAT
(package private) static int	TYPE_INT
(package private) static int	TYPE_LONG
(package private) static int	TYPE_NULL	The type constants are also used as tag values.
(package private) static int	TYPE_SERIALIZED_OBJECT
(package private) static int	TYPE_SHORT
(package private) static int	TYPE_STRING
(package private) static int	TYPE_UUID

Constructor Summary

Constructors

Constructor	Description
ObjectDataType()

Method Summary

Modifier and Type	Method	Description
int	compare(java.lang.Object a, java.lang.Object b)	Compare two keys.
static int	compareNotNull(byte[] data1, byte[] data2)	Compare the contents of two byte arrays.
java.lang.Object[]	createStorage(int size)	Create storage object of array type to hold values
static java.lang.Object	deserialize(byte[] data)	De-serialize the byte array to an object.
int	getMemory(java.lang.Object obj)	Calculates the amount of used memory in bytes.
private static int	getTypeId(java.lang.Object obj)
(package private) static boolean	isArray(java.lang.Object obj)	Check whether this object is an array.
(package private) static boolean	isBigDecimal(java.lang.Object obj)	Check whether this object is a BigDecimal.
(package private) static boolean	isBigInteger(java.lang.Object obj)	Check whether this object is a BigInteger.
(package private) static boolean	isDate(java.lang.Object obj)	Check whether this object is a date.
private ObjectDataType.AutoDetectDataType<java.lang.Object>	newType(int typeId)
java.lang.Object	read(java.nio.ByteBuffer buff)	Read an object.
private ObjectDataType.AutoDetectDataType	selectDataType(int typeId)
static byte[]	serialize(java.lang.Object obj)	Serialize the object to a byte array.
(package private) ObjectDataType.AutoDetectDataType<java.lang.Object>	switchType(java.lang.Object obj)	Switch the last remembered type to match the type of the given object.
void	write(WriteBuffer buff, java.lang.Object obj)	Write an object.

Methods inherited from class org.h2.mvstore.type.BasicDataType

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

TYPE_NULL

static final int TYPE_NULL

The type constants are also used as tag values.

See Also:

Constant Field Values

TYPE_BOOLEAN

static final int TYPE_BOOLEAN

See Also:

Constant Field Values

TYPE_BYTE

static final int TYPE_BYTE

See Also:

Constant Field Values

TYPE_SHORT

static final int TYPE_SHORT

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Constant Field Values

TYPE_INT

static final int TYPE_INT

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Constant Field Values

TYPE_LONG

static final int TYPE_LONG

See Also:

Constant Field Values

TYPE_BIG_INTEGER

static final int TYPE_BIG_INTEGER

See Also:

Constant Field Values

TYPE_FLOAT

static final int TYPE_FLOAT

See Also:

Constant Field Values

TYPE_DOUBLE

static final int TYPE_DOUBLE

See Also:

Constant Field Values

TYPE_BIG_DECIMAL

static final int TYPE_BIG_DECIMAL

See Also:

Constant Field Values

TYPE_CHAR

static final int TYPE_CHAR

See Also:

Constant Field Values

TYPE_STRING

static final int TYPE_STRING

See Also:

Constant Field Values

TYPE_UUID

static final int TYPE_UUID

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Constant Field Values

TYPE_DATE

static final int TYPE_DATE

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Constant Field Values

TYPE_ARRAY

static final int TYPE_ARRAY

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Constant Field Values

TYPE_SERIALIZED_OBJECT

static final int TYPE_SERIALIZED_OBJECT

See Also:

Constant Field Values

TAG_BOOLEAN_TRUE

static final int TAG_BOOLEAN_TRUE

For very common values (e.g. 0 and 1) we save space by encoding the value in the tag. e.g. TAG_BOOLEAN_TRUE and TAG_FLOAT_0.

See Also:

Constant Field Values

TAG_INTEGER_NEGATIVE

static final int TAG_INTEGER_NEGATIVE

See Also:

Constant Field Values

TAG_INTEGER_FIXED

static final int TAG_INTEGER_FIXED

See Also:

Constant Field Values

TAG_LONG_NEGATIVE

static final int TAG_LONG_NEGATIVE

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Constant Field Values

TAG_LONG_FIXED

static final int TAG_LONG_FIXED

See Also:

Constant Field Values

TAG_BIG_INTEGER_0

static final int TAG_BIG_INTEGER_0

See Also:

Constant Field Values

TAG_BIG_INTEGER_1

static final int TAG_BIG_INTEGER_1

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Constant Field Values

TAG_BIG_INTEGER_SMALL

static final int TAG_BIG_INTEGER_SMALL

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Constant Field Values

TAG_FLOAT_0

static final int TAG_FLOAT_0

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Constant Field Values

TAG_FLOAT_1

static final int TAG_FLOAT_1

See Also:

Constant Field Values

TAG_FLOAT_FIXED

static final int TAG_FLOAT_FIXED

See Also:

Constant Field Values

TAG_DOUBLE_0

static final int TAG_DOUBLE_0

See Also:

Constant Field Values

TAG_DOUBLE_1

static final int TAG_DOUBLE_1

See Also:

Constant Field Values

TAG_DOUBLE_FIXED

static final int TAG_DOUBLE_FIXED

See Also:

Constant Field Values

TAG_BIG_DECIMAL_0

static final int TAG_BIG_DECIMAL_0

See Also:

Constant Field Values

TAG_BIG_DECIMAL_1

static final int TAG_BIG_DECIMAL_1

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Constant Field Values

TAG_BIG_DECIMAL_SMALL

static final int TAG_BIG_DECIMAL_SMALL

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Constant Field Values

TAG_BIG_DECIMAL_SMALL_SCALED

static final int TAG_BIG_DECIMAL_SMALL_SCALED

See Also:

Constant Field Values

TAG_INTEGER_0_15

static final int TAG_INTEGER_0_15

For small-values/small-arrays, we encode the value/array-length in the tag.

See Also:

Constant Field Values

TAG_LONG_0_7

static final int TAG_LONG_0_7

See Also:

Constant Field Values

TAG_STRING_0_15

static final int TAG_STRING_0_15

See Also:

Constant Field Values

TAG_BYTE_ARRAY_0_15

static final int TAG_BYTE_ARRAY_0_15

See Also:

Constant Field Values

FLOAT_ZERO_BITS

static final int FLOAT_ZERO_BITS

Constants for floating point synchronization.

FLOAT_ONE_BITS

static final int FLOAT_ONE_BITS

DOUBLE_ZERO_BITS

static final long DOUBLE_ZERO_BITS

DOUBLE_ONE_BITS

static final long DOUBLE_ONE_BITS

COMMON_CLASSES

static final java.lang.Class<?>[] COMMON_CLASSES

last

private ObjectDataType.AutoDetectDataType<java.lang.Object> last

Constructor Detail

ObjectDataType

public ObjectDataType()

Method Detail

createStorage

public java.lang.Object[] createStorage(int size)

Description copied from interface: DataType

Create storage object of array type to hold values

Parameters:

size - number of values to hold

Returns:

storage object

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 java.util.Comparator<java.lang.Object>

Specified by:

compare in interface DataType<java.lang.Object>

Overrides:

compare in class BasicDataType<java.lang.Object>

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

Calculates the amount of used memory in bytes.

Specified by:

getMemory in interface DataType<java.lang.Object>

Specified by:

getMemory in class BasicDataType<java.lang.Object>

Parameters:

obj - the object

Returns:

the used memory

write

public void write(WriteBuffer buff,
                  java.lang.Object obj)

Description copied from interface: DataType

Write an object.

Specified by:

write in interface DataType<java.lang.Object>

Specified by:

write in class BasicDataType<java.lang.Object>

Parameters:

buff - the target buffer

obj - the value

newType

private ObjectDataType.AutoDetectDataType<java.lang.Object> newType(int typeId)

selectDataType

private ObjectDataType.AutoDetectDataType selectDataType(int typeId)

read

public java.lang.Object read(java.nio.ByteBuffer buff)

Description copied from interface: DataType

Read an object.

Specified by:

read in interface DataType<java.lang.Object>

Specified by:

read in class BasicDataType<java.lang.Object>

Parameters:

buff - the source buffer

Returns:

the object

getTypeId

private static int getTypeId(java.lang.Object obj)

switchType

ObjectDataType.AutoDetectDataType<java.lang.Object> switchType(java.lang.Object obj)

Switch the last remembered type to match the type of the given object.

Parameters:

obj - the object

Returns:

the auto-detected type used

isBigInteger

static boolean isBigInteger(java.lang.Object obj)

Check whether this object is a BigInteger.

Parameters:

obj - the object

Returns:

true if yes

isBigDecimal

static boolean isBigDecimal(java.lang.Object obj)

Check whether this object is a BigDecimal.

Parameters:

obj - the object

Returns:

true if yes

isDate

static boolean isDate(java.lang.Object obj)

Check whether this object is a date.

Parameters:

obj - the object

Returns:

true if yes

isArray

static boolean isArray(java.lang.Object obj)

Check whether this object is an array.

Parameters:

obj - the object

Returns:

true if yes

serialize

public static byte[] serialize(java.lang.Object obj)

Serialize the object to a byte array.

Parameters:

obj - the object to serialize

Returns:

the byte array

deserialize

public static java.lang.Object deserialize(byte[] data)

De-serialize the byte array to an object.

Parameters:

data - the byte array

Returns:

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.

Parameters:

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

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

Returns:

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