org.mapdb

Class Serializer.CompressionWrapper<E>

java.lang.Object

org.mapdb.Serializer<E>

org.mapdb.Serializer.CompressionWrapper<E>

All Implemented Interfaces:

Serializable

Enclosing class:

Serializer<A>

public static final class Serializer.CompressionWrapper<E>
extends Serializer<E>
implements Serializable

wraps another serializer and (de)compresses its output/input

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.mapdb.Serializer

Serializer.Array<T>, Serializer.BooleanSer, Serializer.CompressionDeflateWrapper<E>, Serializer.CompressionWrapper<E>, Serializer.EightByteSerializer<E>, Serializer.FourByteSerializer<E>, Serializer.IntegerSerializer, Serializer.LongSerializer

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	compressValues
protected ThreadLocal<CompressLZF>	LZF
protected Serializer<E>	serializer

Fields inherited from class org.mapdb.Serializer

BASIC, BIG_DECIMAL, BIG_INTEGER, BOOLEAN, BOOLEAN_ARRAY, BYTE, BYTE_ARRAY, BYTE_ARRAY_NOSIZE, CHAR, CHAR_ARRAY, CLASS, DATE, DOUBLE, DOUBLE_ARRAY, FLOAT, FLOAT_ARRAY, ILLEGAL_ACCESS, INT_ARRAY, INTEGER, INTEGER_PACKED, INTEGER_PACKED_ZIGZAG, JAVA, LONG, LONG_ARRAY, LONG_PACKED, LONG_PACKED_ZIGZAG, RECID, RECID_ARRAY, SHORT, SHORT_ARRAY, STRING, STRING_ASCII, STRING_INTERN, STRING_NOSIZE, STRING_XXHASH, UUID

Constructor Summary

Constructors

Modifier	Constructor and Description
	Serializer.CompressionWrapper(Serializer<E> serializer)
protected	Serializer.CompressionWrapper(SerializerBase serializerBase, DataInput is, SerializerBase.FastArrayList<Object> objectStack, boolean compressValues) used for deserialization

Method Summary

Methods

Modifier and Type	Method and Description
E	deserialize(DataInput in, int available) Deserialize the content of an object from a DataInput.
boolean	equals(Object o)
BTreeKeySerializer	getBTreeKeySerializer(Comparator comparator)
int	hashCode()
boolean	isTrusted() MapDB has relax record size boundary checking.
void	serialize(DataOutput out, E value) Serialize the content of an object into a ObjectOutput
Object	valueArrayCopyOfRange(Object vals, int from, int to)
Object	valueArrayDeleteValue(Object vals, int pos)
Object	valueArrayDeserialize(DataInput in, int size)
Object	valueArrayEmpty()
Object	valueArrayFromArray(Object[] objects)
E	valueArrayGet(Object vals, int pos)
Object	valueArrayPut(Object vals, int pos, E newValue)
void	valueArraySerialize(DataOutput out, Object vals)
int	valueArraySize(Object vals)
Object	valueArrayUpdateVal(Object vals, int pos, E newValue)

Methods inherited from class org.mapdb.Serializer

equals, fixedSize, hashCode

Methods inherited from class java.lang.Object

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

Field Detail

serializer

protected final Serializer<E> serializer

LZF

protected final ThreadLocal<CompressLZF> LZF

compressValues

protected final boolean compressValues

Constructor Detail

Serializer.CompressionWrapper

public Serializer.CompressionWrapper(Serializer<E> serializer)

Serializer.CompressionWrapper

protected Serializer.CompressionWrapper(SerializerBase serializerBase,
                             DataInput is,
                             SerializerBase.FastArrayList<Object> objectStack,
                             boolean compressValues)
                                 throws IOException

used for deserialization

Throws:

IOException

Method Detail

serialize

public void serialize(DataOutput out,
             E value)
               throws IOException

Description copied from class: Serializer

Serialize the content of an object into a ObjectOutput

Specified by:

serialize in class Serializer<E>

Parameters:

out - ObjectOutput to save object into

value - Object to serialize

Throws:

IOException - in case of IO error

deserialize

public E deserialize(DataInput in,
            int available)
              throws IOException

Description copied from class: Serializer

Deserialize the content of an object from a DataInput.

Specified by:

deserialize in class Serializer<E>

Parameters:

in - to read serialized data from

available - how many bytes are available in DataInput for reading, may be -1 (in streams) or 0 (null).

Returns:

deserialized object

Throws:

IOException - in case of IO error

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isTrusted

public boolean isTrusted()

Description copied from class: Serializer

MapDB has relax record size boundary checking. It expect deserializer to read exactly as many bytes as were writen during serialization. If deserializer reads more bytes it might start reading others record data in store.

Some serializers (Kryo) have problems with this. To prevent this we can not read data directly from store, but must copy them into separate byte[]. So zero copy optimalizations is disabled by default, and must be explicitly enabled here.

This flag indicates if this serializer was 'verified' to read as many bytes as it writes. It should be also much better tested etc.

Overrides:

isTrusted in class Serializer<E>

Returns:

true if this serializer is well tested and writes as many bytes as it reads.

valueArraySerialize

public void valueArraySerialize(DataOutput out,
                       Object vals)
                         throws IOException

Overrides:

valueArraySerialize in class Serializer<E>

Throws:

IOException

valueArrayDeserialize

public Object valueArrayDeserialize(DataInput in,
                           int size)
                             throws IOException

Overrides:

valueArrayDeserialize in class Serializer<E>

Throws:

IOException

valueArrayGet

public E valueArrayGet(Object vals,
              int pos)

Overrides:

valueArrayGet in class Serializer<E>

valueArraySize

public int valueArraySize(Object vals)

Overrides:

valueArraySize in class Serializer<E>

valueArrayEmpty

public Object valueArrayEmpty()

Overrides:

valueArrayEmpty in class Serializer<E>

valueArrayPut

public Object valueArrayPut(Object vals,
                   int pos,
                   E newValue)

Overrides:

valueArrayPut in class Serializer<E>

valueArrayUpdateVal

public Object valueArrayUpdateVal(Object vals,
                         int pos,
                         E newValue)

Overrides:

valueArrayUpdateVal in class Serializer<E>

valueArrayFromArray

public Object valueArrayFromArray(Object[] objects)

Overrides:

valueArrayFromArray in class Serializer<E>

valueArrayCopyOfRange

public Object valueArrayCopyOfRange(Object vals,
                           int from,
                           int to)

Overrides:

valueArrayCopyOfRange in class Serializer<E>

valueArrayDeleteValue

public Object valueArrayDeleteValue(Object vals,
                           int pos)

Overrides:

valueArrayDeleteValue in class Serializer<E>

getBTreeKeySerializer

public BTreeKeySerializer getBTreeKeySerializer(Comparator comparator)

Overrides:

getBTreeKeySerializer in class Serializer<E>