MemSizeEstimator.java

/*
 * Copyright (c) [2016] [ <ether.camp> ]
 * 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 <http://www.gnu.org/licenses/>.
 */
package org.ethereum.datasource;

/**
 * Interface for estimating size of a specific Java type
 *
 * Created by Anton Nashatyrev on 01.12.2016.
 */
public interface MemSizeEstimator<E> {

    long estimateSize(E e);

    /**
     * byte[] type size estimator
     */
    MemSizeEstimator<byte[]> ByteArrayEstimator = new MemSizeEstimator<byte[]>() {
        @Override
        public long estimateSize(byte[] bytes) {
            return bytes == null ? 0 : bytes.length + 4; // 4 - compressed ref size
        }
    };
}