org.mapdb

Class BTreeKeySerializer.BasicKeySerializer

java.lang.Object

org.mapdb.BTreeKeySerializer<Object>

org.mapdb.BTreeKeySerializer.BasicKeySerializer

All Implemented Interfaces:

Serializable

Enclosing class:

BTreeKeySerializer<K>

public static final class BTreeKeySerializer.BasicKeySerializer
extends BTreeKeySerializer<Object>
implements Serializable

Basic Key Serializer which just writes data without applying any compression. Is used by default if no other Key Serializer is specified.

See Also:

Serialized Form

Nested Class Summary

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

BTreeKeySerializer.BasicKeySerializer, BTreeKeySerializer.Tuple2KeySerializer<A,B>, BTreeKeySerializer.Tuple3KeySerializer<A,B,C>, BTreeKeySerializer.Tuple4KeySerializer<A,B,C,D>, BTreeKeySerializer.Tuple5KeySerializer<A,B,C,D,E>, BTreeKeySerializer.Tuple6KeySerializer<A,B,C,D,E,F>

Field Summary

Fields

Modifier and Type	Field and Description
protected Serializer	defaultSerializer

Fields inherited from class org.mapdb.BTreeKeySerializer

BASIC, STRING, TUPLE2, TUPLE3, TUPLE4, ZERO_OR_POSITIVE_INT, ZERO_OR_POSITIVE_LONG

Constructor Summary

Constructors

Modifier	Constructor and Description
	BasicKeySerializer(Serializer defaultSerializer)
protected	BasicKeySerializer(SerializerBase serializerBase, DataInput is, SerializerBase.FastArrayList<Object> objectStack) used for deserialization

Method Summary

Modifier and Type	Method and Description
Object[]	deserialize(DataInput in, int start, int end, int size) Deserializes keys for single BTree Node.
Comparator<Object>	getComparator() Some key serializers may only work with they own comparators.
void	serialize(DataOutput out, int start, int end, Object[] keys) Serialize keys from single BTree Node.

Methods inherited from class org.mapdb.BTreeKeySerializer

leadingValuePackRead, leadingValuePackWrite

Methods inherited from class java.lang.Object

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

Field Detail

defaultSerializer

protected final Serializer defaultSerializer

Constructor Detail

BasicKeySerializer

public BasicKeySerializer(Serializer defaultSerializer)

BasicKeySerializer

protected BasicKeySerializer(SerializerBase serializerBase,
                             DataInput is,
                             SerializerBase.FastArrayList<Object> objectStack)
                      throws IOException

used for deserialization

Throws:

IOException

Method Detail

serialize

public void serialize(DataOutput out,
                      int start,
                      int end,
                      Object[] keys)
               throws IOException

Description copied from class: BTreeKeySerializer

Serialize keys from single BTree Node.

Specified by:

serialize in class BTreeKeySerializer<Object>

Parameters:

out - output stream where to put ata

start - where data start in array. Before this index all keys are null

end - where data ends in array (exclusive). From this index all keys are null

keys - array of keys for single BTree Node

Throws:

IOException

deserialize

public Object[] deserialize(DataInput in,
                            int start,
                            int end,
                            int size)
                     throws IOException

Description copied from class: BTreeKeySerializer

Deserializes keys for single BTree Node. To

Specified by:

deserialize in class BTreeKeySerializer<Object>

Parameters:

in - input stream to read data from

start - where data start in array. Before this index all keys are null

end - where data ends in array (exclusive). From this index all keys are null

size - size of array which should be returned

Returns:

array of keys for single BTree Node

Throws:

IOException

getComparator

public Comparator<Object> getComparator()

Description copied from class: BTreeKeySerializer

Some key serializers may only work with they own comparators. For example delta-packing stores increments between numbers and requires ascending order. So Key Serializer may provide its own comparator.

Specified by:

getComparator in class BTreeKeySerializer<Object>

Returns:

comparator which must be used with this method. `null` if comparator is not strictly required.