org.mapdb

Class SerializerBase

java.lang.Object

org.mapdb.Serializer<java.lang.Object>

org.mapdb.SerializerBase

Direct Known Subclasses:

SerializerPojo

public class SerializerBase
extends Serializer<java.lang.Object>

Serializer which uses 'header byte' to serialize/deserialize most of classes from 'java.lang' and 'java.util' packages.

Nested Class Summary

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

Serializer.Array<T>, Serializer.CompressionDeflateWrapper<E>, Serializer.CompressionWrapper<E>

Field Summary

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
SerializerBase()

Method Summary

Modifier and Type	Method and Description
void	assertSerializable(java.lang.Object o)
java.lang.Object	deserialize(java.io.DataInput in, int capacity) Deserialize the content of an object from a DataInput.
java.lang.Object	deserialize(java.io.DataInput in, org.mapdb.SerializerBase.FastArrayList<java.lang.Object> objectStack)
boolean	equalsBinary(java.lang.Object a1, java.lang.Object a2) Tries to serialize two object and return true if they are binary equal
boolean	isSerializable(java.lang.Object o) return true if mapdb knows howto serialize given object
boolean	isTrusted() MapDB has relax record size boundary checking.
void	serialize(java.io.DataOutput out, java.lang.Object obj) Serialize the content of an object into a ObjectOutput
void	serialize(java.io.DataOutput out, java.lang.Object obj, org.mapdb.SerializerBase.FastArrayList<java.lang.Object> objectStack)
void	serializeObjectArray(java.io.DataOutput out, java.lang.Object[] b, org.mapdb.SerializerBase.FastArrayList objectStack)

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

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

Constructor Detail

SerializerBase

public SerializerBase()

Method Detail

serializeObjectArray

public void serializeObjectArray(java.io.DataOutput out,
                                 java.lang.Object[] b,
                                 org.mapdb.SerializerBase.FastArrayList objectStack)
                          throws java.io.IOException

Throws:

java.io.IOException

serialize

public void serialize(java.io.DataOutput out,
                      java.lang.Object obj)
               throws java.io.IOException

Description copied from class: Serializer

Serialize the content of an object into a ObjectOutput

Specified by:

serialize in class Serializer<java.lang.Object>

Parameters:

out - ObjectOutput to save object into

obj - Object to serialize

Throws:

java.io.IOException - in case of IO error

serialize

public void serialize(java.io.DataOutput out,
                      java.lang.Object obj,
                      org.mapdb.SerializerBase.FastArrayList<java.lang.Object> objectStack)
               throws java.io.IOException

Throws:

java.io.IOException

deserialize

public java.lang.Object deserialize(java.io.DataInput in,
                                    int capacity)
                             throws java.io.IOException

Description copied from class: Serializer

Deserialize the content of an object from a DataInput.

Specified by:

deserialize in class Serializer<java.lang.Object>

Parameters:

in - to read serialized data from

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

Returns:

deserialized object

Throws:

java.io.IOException - in case of IO error

deserialize

public java.lang.Object deserialize(java.io.DataInput in,
                                    org.mapdb.SerializerBase.FastArrayList<java.lang.Object> objectStack)
                             throws java.io.IOException

Throws:

java.io.IOException

assertSerializable

public void assertSerializable(java.lang.Object o)

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<java.lang.Object>

Returns:

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

isSerializable

public boolean isSerializable(java.lang.Object o)

return true if mapdb knows howto serialize given object

equalsBinary

public boolean equalsBinary(java.lang.Object a1,
                            java.lang.Object a2)

Tries to serialize two object and return true if they are binary equal

Parameters:

a1 - first object

a2 - second object

Returns:

true if objects are equal or binary equal, false if not equal or some failure happend