Top Description Inners Fields Constructors Methods
org.h2.mvstore.type

public Class ObjectDataType

extends BasicDataType<Object>
Class Inheritance
Imports
java.io.ByteArrayInputStream, .ByteArrayOutputStream, .ObjectInputStream, .ObjectOutputStream, java.lang.reflect.Array, java.math.BigDecimal, .BigInteger, java.nio.ByteBuffer, java.util.Arrays, .Date, .HashMap, .UUID, org.h2.mvstore.DataUtils, .WriteBuffer, org.h2.util.Utils
A data type implementation for the most common data types, including serializable objects.

Nested and Inner Type Summary

Modifier and TypeClass and Description
pack-priv abstract static class
ObjectDataType.AutoDetectDataType<T>

The base class for auto-detect data types.

pack-priv static class
ObjectDataType.BigDecimalType

The type for BigDecimal objects.

pack-priv static class
ObjectDataType.BigIntegerType

The type for BigInteger objects.

pack-priv static class
ObjectDataType.BooleanType

The type for boolean true and false.

pack-priv static class
ObjectDataType.ByteType

The type for byte objects.

pack-priv static class
ObjectDataType.CharacterType

The type for character objects.

pack-priv static class
ObjectDataType.DateType

The type for java.util.Date objects.

pack-priv static class
ObjectDataType.DoubleType

The type for double objects.

pack-priv static class
ObjectDataType.FloatType

The type for float objects.

private static class
ObjectDataType.Holder

pack-priv static class
ObjectDataType.IntegerType

The type for integer objects.

pack-priv static class
ObjectDataType.LongType

The type for long objects.

pack-priv static class
ObjectDataType.NullType

The type for the null value

pack-priv static class
ObjectDataType.ObjectArrayType

The type for object arrays.

pack-priv static class
ObjectDataType.SerializedObjectType

The type for serialized objects.

pack-priv static class
ObjectDataType.ShortType

The type for short objects.

pack-priv static class
ObjectDataType.StringType

The type for string objects.

pack-priv static class
ObjectDataType.UUIDType

The type for UUID objects.

Field Summary

Modifier and TypeField and Description
pack-priv static final Class<?>[]
COMMON_CLASSES

pack-priv static final long
DOUBLE_ONE_BITS

pack-priv static final long
DOUBLE_ZERO_BITS

pack-priv static final int
FLOAT_ONE_BITS

pack-priv static final int
FLOAT_ZERO_BITS

Constants for floating point synchronization.

private ObjectDataType.AutoDetectDataType<Object>
last

pack-priv static final int
TAG_BIG_DECIMAL_0

pack-priv static final int
TAG_BIG_DECIMAL_1

pack-priv static final int
TAG_BIG_DECIMAL_SMALL

pack-priv static final int
TAG_BIG_DECIMAL_SMALL_SCALED

pack-priv static final int
TAG_BIG_INTEGER_0

pack-priv static final int
TAG_BIG_INTEGER_1

pack-priv static final int
TAG_BIG_INTEGER_SMALL

pack-priv 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.

pack-priv static final int
TAG_BYTE_ARRAY_0_15

pack-priv static final int
TAG_DOUBLE_0

pack-priv static final int
TAG_DOUBLE_1

pack-priv static final int
TAG_DOUBLE_FIXED

pack-priv static final int
TAG_FLOAT_0

pack-priv static final int
TAG_FLOAT_1

pack-priv static final int
TAG_FLOAT_FIXED

pack-priv static final int
TAG_INTEGER_0_15

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

pack-priv static final int
TAG_INTEGER_FIXED

pack-priv static final int
TAG_INTEGER_NEGATIVE

pack-priv static final int
TAG_LONG_0_7

pack-priv static final int
TAG_LONG_FIXED

pack-priv static final int
TAG_LONG_NEGATIVE

pack-priv static final int
TAG_STRING_0_15

pack-priv static final int
TYPE_ARRAY

pack-priv static final int
TYPE_BIG_DECIMAL

pack-priv static final int
TYPE_BIG_INTEGER

pack-priv static final int
TYPE_BOOLEAN

pack-priv static final int
TYPE_BYTE

pack-priv static final int
TYPE_CHAR

pack-priv static final int
TYPE_DATE

pack-priv static final int
TYPE_DOUBLE

pack-priv static final int
TYPE_FLOAT

pack-priv static final int
TYPE_INT

pack-priv static final int
TYPE_LONG

pack-priv static final int
TYPE_NULL

The type constants are also used as tag values.

pack-priv static final int
TYPE_SERIALIZED_OBJECT

pack-priv static final int
TYPE_SHORT

pack-priv static final int
TYPE_STRING

pack-priv static final int
TYPE_UUID

Constructor Summary

AccessConstructor and Description
public
ObjectDataType()

Method Summary

Modifier and TypeMethod and Description
public int
compare(Object
the first key
a, Object
the second key
b)

Overrides org.h2.mvstore.type.BasicDataType.compare.

Implements org.h2.mvstore.type.DataType.compare.

Compare two keys.

public static int

Returns:

the result of the comparison (-1, 1 or 0)
compareNotNull(byte[]
the first byte array (must not be null)
data1, byte[]
the second byte array (must not be null)
data2)

Compare the contents of two byte arrays.

public Object[]
createStorage(int
number of values to hold
size)

Implements org.h2.mvstore.type.DataType.createStorage.

Create storage object of array type to hold values

public static Object

Returns:

the object
deserialize(byte[]
the byte array
data)

De-serialize the byte array to an object.

public int
getMemory(Object
the object
obj)

Implements abstract org.h2.mvstore.type.BasicDataType.getMemory.

Implements org.h2.mvstore.type.DataType.getMemory.

Calculates the amount of used memory in bytes.

private static int
getTypeId(Object obj)

pack-priv static boolean

Returns:

true if yes
isArray(Object
the object
obj)

Check whether this object is an array.

pack-priv static boolean

Returns:

true if yes
isBigDecimal(Object
the object
obj)

Check whether this object is a BigDecimal.

pack-priv static boolean

Returns:

true if yes
isBigInteger(Object
the object
obj)

Check whether this object is a BigInteger.

pack-priv static boolean

Returns:

true if yes
isDate(Object
the object
obj)

Check whether this object is a date.

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

public Object
read(ByteBuffer
the source buffer
buff)

Implements abstract org.h2.mvstore.type.BasicDataType.read.

Implements org.h2.mvstore.type.DataType.read.

Read an object.

private ObjectDataType.AutoDetectDataType<T>
selectDataType(int typeId)

public static byte[]

Returns:

the byte array
serialize(Object
the object to serialize
obj)

Serialize the object to a byte array.

pack-priv ObjectDataType.AutoDetectDataType<Object>

Returns:

the auto-detected type used
switchType(Object
the object
obj)

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

public void
write(WriteBuffer
the target buffer
buff, Object
the value
obj)

Implements abstract org.h2.mvstore.type.BasicDataType.write.

Implements org.h2.mvstore.type.DataType.write.

Write an object.

Inherited from org.h2.mvstore.type.BasicDataType:
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