org.mapdb.serializer

Class SerializerStringOrigHash

java.lang.Object

org.mapdb.serializer.SerializerString

org.mapdb.serializer.SerializerStringOrigHash

All Implemented Interfaces:

java.util.Comparator<java.lang.String>, Serializer<java.lang.String>, GroupSerializer<java.lang.String>

public class SerializerStringOrigHash
extends SerializerString

Created by jan on 2/28/16.

Field Summary

Fields inherited from interface org.mapdb.Serializer

BIG_DECIMAL, BIG_INTEGER, BOOLEAN, BYTE, BYTE_ARRAY, BYTE_ARRAY_DELTA, BYTE_ARRAY_DELTA2, BYTE_ARRAY_NOSIZE, CHAR, CHAR_ARRAY, CLASS, DATE, DOUBLE, DOUBLE_ARRAY, ELSA, FLOAT, FLOAT_ARRAY, ILLEGAL_ACCESS, INT_ARRAY, INTEGER, INTEGER_DELTA, INTEGER_PACKED, JAVA, LONG, LONG_ARRAY, LONG_DELTA, LONG_PACKED, RECID, RECID_ARRAY, SHORT, SHORT_ARRAY, STRING, STRING_ASCII, STRING_DELTA, STRING_DELTA2, STRING_INTERN, STRING_NOSIZE, STRING_ORIGHASH, UUID

Constructor Summary

Constructors

Constructor and Description
SerializerStringOrigHash()

Method Summary

Modifier and Type	Method and Description
java.lang.String	deserialize(DataInput2 in, int available) Deserializes and returns the content of the given DataInput2.
int	hashCode(java.lang.String s, int seed) Returns a hash code of a given non-null argument.
boolean	isTrusted() Returns if this Serializer is trusted to always read the same number of bytes as it writes for any given object being serialized/de-serialized.
void	serialize(DataOutput2 out, java.lang.String value) Serializes the content of the given value into the given DataOutput2.

Methods inherited from class org.mapdb.serializer.SerializerString

valueArrayCopyOfRange, valueArrayDeleteValue, valueArrayDeserialize, valueArrayEmpty, valueArrayFromArray, valueArrayGet, valueArrayPut, valueArraySearch, valueArraySearch, valueArraySerialize, valueArraySize, valueArrayUpdateVal

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mapdb.serializer.GroupSerializer

nextValue, valueArrayBinaryGet, valueArrayBinarySearch, valueArrayToArray

Methods inherited from interface org.mapdb.Serializer

clone, compare, deserializeFromLong, equals, fixedSize, needsAvailableSizeHint

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

SerializerStringOrigHash

public SerializerStringOrigHash()

Method Detail

serialize

public void serialize(DataOutput2 out,
                      java.lang.String value)
               throws java.io.IOException

Description copied from interface: Serializer

Serializes the content of the given value into the given DataOutput2.

Specified by:

serialize in interface Serializer<java.lang.String>

Overrides:

serialize in class SerializerString

Parameters:

out - DataOutput2 to save object into

value - Object to serialize

Throws:

java.io.IOException - in case of an I/O error

deserialize

public java.lang.String deserialize(DataInput2 in,
                                    int available)
                             throws java.io.IOException

Description copied from interface: Serializer

Deserializes and returns the content of the given DataInput2.

Specified by:

deserialize in interface Serializer<java.lang.String>

Overrides:

deserialize in class SerializerString

Parameters:

in - DataInput2 to de-serialize data from

available - how many bytes that are available in the DataInput2 for reading, may be -1 (in streams) or 0 (null).

Returns:

the de-serialized content of the given DataInput2

Throws:

java.io.IOException - in case of an I/O error

isTrusted

public boolean isTrusted()

Description copied from interface: Serializer

Returns if this Serializer is trusted to always read the same number of bytes as it writes for any given object being serialized/de-serialized.

MapDB has a relaxed record size boundary checking. It expects deserializers to read exactly as many bytes as were written during serialization. If a deserializer reads more bytes than it wrote, 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 a store, but we must copy them into separate byte[] buffers. Thus, zero-copy optimizations are disabled by default, but can be explicitly enabled here by letting this method return true.

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

Specified by:

isTrusted in interface Serializer<java.lang.String>

Overrides:

isTrusted in class SerializerString

Returns:

if this Serializer is trusted to always read the same number of bytes as it writes for any given object being serialized/de-serialized

hashCode

public int hashCode(@NotNull
                    java.lang.String s,
                    int seed)

Description copied from interface: Serializer

Returns a hash code of a given non-null argument. The output of the method is affected by the given seed, allowing protection against crafted hash attacks and to provide a better distribution of hashes.

Specified by:

hashCode in interface Serializer<java.lang.String>

Overrides:

hashCode in class SerializerString

Parameters:

s - an object

seed - used to "scramble" the

Returns:

a hash code of a non-null argument

See Also:

Object.hashCode()