org.mapdb

Class BTreeMap.NodeSerializer<A,B>

java.lang.Object

org.mapdb.Serializer<BTreeMap.BNode>

org.mapdb.BTreeMap.NodeSerializer<A,B>

Enclosing class:

BTreeMap<K,V>

protected static final class BTreeMap.NodeSerializer<A,B>
extends Serializer<BTreeMap.BNode>

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	hasValues
protected BTreeKeySerializer	keySerializer
protected static int	LEAF_MASK
protected static int	LEFT_MASK
protected static int	LEFT_SHIFT
protected int	numberOfNodeMetas
protected static int	RIGHT_MASK
protected static int	RIGHT_SHIFT
protected static int	SIZE_MASK
protected boolean	valsOutsideNodes
protected Serializer<Object>	valueSerializer

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

Constructor and Description
BTreeMap.NodeSerializer(boolean valsOutsideNodes, BTreeKeySerializer keySerializer, Serializer valueSerializer, int numberOfNodeMetas)

Method Summary

Methods

Modifier and Type	Method and Description
BTreeMap.BNode	deserialize(DataInput in, int available) Deserialize the content of an object from a DataInput.
boolean	isTrusted() MapDB has relax record size boundary checking.
void	serialize(DataOutput out, BTreeMap.BNode value) Serialize the content of an object into a ObjectOutput
protected void	serializeChildArray(DataOutput out, Object childArray)

Methods inherited from class org.mapdb.Serializer

equals, fixedSize, getBTreeKeySerializer, hashCode, valueArrayCopyOfRange, valueArrayDeleteValue, valueArrayDeserialize, valueArrayEmpty, valueArrayFromArray, valueArrayGet, valueArrayPut, valueArraySerialize, valueArraySize, valueArrayUpdateVal

Methods inherited from class java.lang.Object

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

Field Detail

LEAF_MASK

protected static final int LEAF_MASK

See Also:

Constant Field Values

LEFT_SHIFT

protected static final int LEFT_SHIFT

See Also:

Constant Field Values

LEFT_MASK

protected static final int LEFT_MASK

See Also:

Constant Field Values

RIGHT_SHIFT

protected static final int RIGHT_SHIFT

See Also:

Constant Field Values

RIGHT_MASK

protected static final int RIGHT_MASK

See Also:

Constant Field Values

SIZE_MASK

protected static final int SIZE_MASK

See Also:

Constant Field Values

hasValues

protected final boolean hasValues

valsOutsideNodes

protected final boolean valsOutsideNodes

keySerializer

protected final BTreeKeySerializer keySerializer

valueSerializer

protected final Serializer<Object> valueSerializer

numberOfNodeMetas

protected final int numberOfNodeMetas

Constructor Detail

BTreeMap.NodeSerializer

public BTreeMap.NodeSerializer(boolean valsOutsideNodes,
                       BTreeKeySerializer keySerializer,
                       Serializer valueSerializer,
                       int numberOfNodeMetas)

Method Detail

serialize

public void serialize(DataOutput out,
             BTreeMap.BNode value)
               throws IOException

Description copied from class: Serializer

Serialize the content of an object into a ObjectOutput

Specified by:

serialize in class Serializer<BTreeMap.BNode>

Parameters:

out - ObjectOutput to save object into

value - Object to serialize

Throws:

IOException - in case of IO error

serializeChildArray

protected void serializeChildArray(DataOutput out,
                       Object childArray)
                            throws IOException

Throws:

IOException

deserialize

public BTreeMap.BNode 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<BTreeMap.BNode>

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

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<BTreeMap.BNode>

Returns:

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