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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.vm.hook;

import org.ethereum.vm.OpCode;
import org.ethereum.vm.program.Program;

/**
 * Created by Anton Nashatyrev on 15.02.2016.
 */
public interface VMHook {

    default void startPlay(Program program) {
    }

    default void step(Program program, OpCode opcode) {
    }

    default void stopPlay(Program program) {
    }

    default boolean isEmpty() {
        return false;
    }

    VMHook EMPTY = new VMHook() {
        @Override
        public boolean isEmpty() {
            return true;
        }
    };
}