package org.mapdb.ser;

import org.jetbrains.annotations.NotNull;

import org.jetbrains.annotations.Nullable;

import org.mapdb.io.DataInput2;

import org.mapdb.io.DataInput2ByteArray;

import org.mapdb.io.DataOutput2;

import org.mapdb.io.DataOutput2ByteArray;

import java.io.IOError;

import java.io.IOException;

import java.util.Comparator;

/** Turns object instance into binary form and vice versa */

public interface Serializer<K> extends Comparator<K> { //TODO deatach comparator from serializer???

void serialize(@NotNull DataOutput2 out, @NotNull K k);

K deserialize(@NotNull DataInput2 input);

@Nullable Class serializedType();

default boolean equals(@Nullable K k1, @Nullable K k2){

return k1==k2 || (k1!=null && k1.equals(k2));

}

default int hashCode(@NotNull K k){

return k.hashCode(); //TODO better hash

}

default int hashCode(@NotNull K k, int hashSeed){

return hashSeed + k.hashCode(); //TODO better mixing

}

default K deserialize(DataInput2 in, int i){

if(i!=-1)

throw new AssertionError(); //FIXME temp method for compatibility

return deserialize(in);

}

@Deprecated

default boolean isTrusted(){

return true;

}

default int compare(K k1, K k2){

return ((Comparable)k1).compareTo(k2); //TODO comparators

}

default int fixedSize() {

return -1;

}

/** Creates binary copy of given object. If the datatype is immutable the same instance might be returned */

default K clone(K value){

DataOutput2 out = new DataOutput2ByteArray();

serialize(out, value);

DataInput2 in2 = new DataInput2ByteArray(out.copyBytes());

return deserialize(in2);

}

}