org.mapdb
Class SerializerBase

java.lang.Object
  org.mapdb.SerializerBase

All Implemented Interfaces:

Serializer<Object>

Direct Known Subclasses:

SerializerPojo

public class SerializerBase
extends Object
implements Serializer<Object>

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

Author:

Jan Kotek

Nested Class Summary

protected static class	SerializerBase.FastArrayList<K> Utility class similar to ArrayList, but with fast identity search.
protected static interface	SerializerBase.Header Header byte, is used at start of each record to indicate data type WARNING !!! values bellow must be unique !!!!!
protected static interface	SerializerBase.HeaderMapDB
protected static class	SerializerBase.singletons

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

Serializer.CompressionWrapper<E>

Field Summary

protected static String

EMPTY_STRING

Fields inherited from interface org.mapdb.Serializer

BASIC, BOOLEAN, BYTE_ARRAY, BYTE_ARRAY_NOSIZE, CHAR_ARRAY, DOUBLE_ARRAY, ILLEGAL_ACCESS, INT_ARRAY, INTEGER, JAVA, LONG, LONG_ARRAY, STRING, STRING_ASCII, STRING_INTERN, STRING_NOSIZE, UUID

Constructor Summary

SerializerBase()

Method Summary

static void	assertSerializable(Object o)
protected static byte[]	booleanToByteArray(boolean[] bool) Builds a byte array from the array of booleans, compressing up to 8 booleans per byte.
Object	deserialize(DataInput is, int capacity) Deserialize the content of an object from a DataInput.
Object	deserialize(DataInput is, SerializerBase.FastArrayList<Object> objectStack)
protected Class	deserializeClass(DataInput is)
protected Object	deserializeMapDB(DataInput is, SerializerBase.FastArrayList<Object> objectStack)
protected Object	deserializeUnknownHeader(DataInput is, int head, SerializerBase.FastArrayList<Object> objectStack) override this method to extend SerializerBase functionality
int	fixedSize() Data could be serialized into record with variable size or fixed size.
protected Engine	getEngine()
protected static boolean[]	readBooleanArray(int numBools, DataInput is) Unpacks an integer from the DataInput indicating the number of booleans that are compressed.
void	serialize(DataOutput out, Object obj) Serialize the content of an object into a ObjectOutput
void	serialize(DataOutput out, Object obj, SerializerBase.FastArrayList<Object> objectStack)
protected void	serializeClass(DataOutput out, Class clazz)
protected void	serializeUnknownObject(DataOutput out, Object obj, SerializerBase.FastArrayList<Object> objectStack) override this method to extend SerializerBase functionality

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_STRING

protected static final String EMPTY_STRING

See Also:

Constant Field Values

Constructor Detail

SerializerBase

public SerializerBase()

Method Detail

serialize

public void serialize(DataOutput out,
                      Object obj)
               throws IOException

Description copied from interface: Serializer

Serialize the content of an object into a ObjectOutput

Specified by:

serialize in interface Serializer<Object>

Parameters:

out - ObjectOutput to save object into

obj - Object to serialize

Throws:

IOException

serialize

public void serialize(DataOutput out,
                      Object obj,
                      SerializerBase.FastArrayList<Object> objectStack)
               throws IOException

Throws:

IOException

serializeClass

protected void serializeClass(DataOutput out,
                              Class clazz)
                       throws IOException

Throws:

IOException

deserialize

public Object deserialize(DataInput is,
                          int capacity)
                   throws IOException

Description copied from interface: Serializer

Deserialize the content of an object from a DataInput.

Specified by:

deserialize in interface Serializer<Object>

Parameters:

is - 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:

IOException

deserialize

public Object deserialize(DataInput is,
                          SerializerBase.FastArrayList<Object> objectStack)
                   throws IOException

Throws:

IOException

assertSerializable

public static void assertSerializable(Object o)

deserializeMapDB

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

Throws:

IOException

getEngine

protected Engine getEngine()

deserializeClass

protected Class deserializeClass(DataInput is)
                          throws IOException

Throws:

IOException

serializeUnknownObject

protected void serializeUnknownObject(DataOutput out,
                                      Object obj,
                                      SerializerBase.FastArrayList<Object> objectStack)
                               throws IOException

override this method to extend SerializerBase functionality

Throws:

IOException

deserializeUnknownHeader

protected Object deserializeUnknownHeader(DataInput is,
                                          int head,
                                          SerializerBase.FastArrayList<Object> objectStack)
                                   throws IOException

override this method to extend SerializerBase functionality

Throws:

IOException

booleanToByteArray

protected static byte[] booleanToByteArray(boolean[] bool)

Builds a byte array from the array of booleans, compressing up to 8 booleans per byte. Author of this method is Chris Alexander.

Parameters:

bool - The booleans to be compressed.

Returns:

The fully compressed byte array.

readBooleanArray

protected static boolean[] readBooleanArray(int numBools,
                                            DataInput is)
                                     throws IOException

Unpacks an integer from the DataInput indicating the number of booleans that are compressed. It then calculates the number of bytes, reads them in, and decompresses and converts them into an array of booleans using the toBooleanArray(byte[]); method. The array of booleans are trimmed to numBools elements. This is necessary in situations where the number of booleans is not a multiple of 8. Author of this method is Chris Alexander.

Returns:

The boolean array decompressed from the bytes read in.

Throws:

IOException - If an error occurred while reading.

fixedSize

public int fixedSize()

Description copied from interface: Serializer

Data could be serialized into record with variable size or fixed size. Some optimizations can be applied to serializers with fixed size

Specified by:

fixedSize in interface Serializer<Object>

Returns:

fixed size or -1 for variable size