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/*
 * Copyright (c) [2016] [  ]
 * This file is part of the ethereumJ library.
 *
 * The ethereumJ library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The ethereumJ library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the ethereumJ library. If not, see .
 */
package com.higgschain.trust.evmcontract.datasource;

import com.higgschain.trust.evmcontract.core.AccountState;
import com.higgschain.trust.evmcontract.util.RLP;
import com.higgschain.trust.evmcontract.vm.DataWord;

/**
 * Collection of common Serializers
 * Created by Anton Nashatyrev on 08.11.2016.
 */
public class Serializers {

    /**
     * No conversion
     *
     * @param  the type parameter
     */
    public static class Identity implements Serializer {
        @Override
        public T serialize(T object) {
            return object;
        }

        @Override
        public T deserialize(T stream) {
            return stream;
        }
    }

    /**
     * Serializes/Deserializes AccountState instances from the State Trie (part of Ethereum spec)
     */
    public final static Serializer ACCOUNT_STATE_SERIALIZER = new Serializer() {
        @Override
        public byte[] serialize(AccountState object) {
            return object.getEncoded();
        }

        @Override
        public AccountState deserialize(byte[] stream) {
            return stream == null || stream.length == 0 ? null : new AccountState(stream);
        }
    };

    /**
     * Contract storage key serializer
     */
    public final static Serializer STORAGE_KEY_SERIALIZER = new Serializer() {
        @Override
        public byte[] serialize(DataWord object) {
            return object.getData();
        }

        @Override
        public DataWord deserialize(byte[] stream) {
            return new DataWord(stream);
        }
    };

    /**
     * Contract storage value serializer (part of Ethereum spec)
     */
    public final static Serializer STORAGE_VALUE_SERIALIZER = new Serializer() {
        @Override
        public byte[] serialize(DataWord object) {
            return RLP.encodeElement(object.getNoLeadZeroesData());
        }

        @Override
        public DataWord deserialize(byte[] stream) {
            if (stream == null || stream.length == 0) {
                return null;
            }
            byte[] dataDecoded = RLP.decode2(stream).get(0).getRLPData();
            return new DataWord(dataDecoded);
        }
    };

}