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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service

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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 org.ethereum.validator;

import org.ethereum.config.SystemProperties;
import org.ethereum.core.BlockHeader;

import java.math.BigInteger;

import static org.ethereum.util.BIUtil.isEqual;

/**
 * Checks block's difficulty against calculated difficulty value
 *
 * @author Mikhail Kalinin
 * @since 02.09.2015
 */
public class DifficultyRule extends DependentBlockHeaderRule {

    private final SystemProperties config;

    public DifficultyRule(SystemProperties config) {
        this.config = config;
    }

    @Override
    public boolean validate(BlockHeader header, BlockHeader parent) {

        errors.clear();

        BigInteger calcDifficulty = header.calcDifficulty(config.getBlockchainConfig(), parent);
        BigInteger difficulty = header.getDifficultyBI();

        if (!isEqual(difficulty, calcDifficulty)) {

            errors.add(String.format("#%d: difficulty != calcDifficulty", header.getNumber()));
            return false;
        }

        return true;
    }
}