cn.maarlakes.common.id.NumericIdGenerator Maven / Gradle / Ivy

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提供常用工具

There is a newer version: 1.6.1

package cn.maarlakes.common.id;

import com.aventrix.jnanoid.jnanoid.NanoIdUtils;
import jakarta.annotation.Nonnull;

import java.security.SecureRandom;

/**
 * @author linjpxc
 */
public final class NumericIdGenerator implements IdGenerator {

    private static final char[] DEFAULT_ALPHABET = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
    private static final int LENGTH = 21;
    private final SecureRandom secureRandom = new SecureRandom();

    private final int length;

    public NumericIdGenerator() {
        this(LENGTH);
    }

    public NumericIdGenerator(int length) {
        this.length = length - 1;
    }

    @Nonnull
    @Override
    public String generateId() {
        return (this.secureRandom.nextInt(9) + 1) + NanoIdUtils.randomNanoId(this.secureRandom, DEFAULT_ALPHABET, this.length);
    }
}