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Pure Java implementation for JSON Web Token (JWT)

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package com.rongjih.jwt;

import com.rongjih.jwt.signer.HS256;
import com.rongjih.jwt.signer.NONE;

import java.util.HashMap;
import java.util.Map;

/**
 * The factory to get specific algorithm signer.
 *
 * @author RJ
 * @since JDK1.8
 */
public class SignerFactory {
	public static Signer get(Algorithm algorithm) {
		if (algorithm == null || algorithm.equals(Algorithm.NONE)) {
			return getInstance(Algorithm.NONE);
		}

		switch (algorithm) {
			case HS256:
				return new HS256();
			default:
				throw new SignException("The algorithm '" + algorithm.name() + "' is not support.");
		}
	}

	private static Map signers = new HashMap<>();

	private static Signer getInstance(Algorithm algorithm) {
		if (signers.containsKey(algorithm)) {
			return signers.get(algorithm);
		} else {
			Signer signer;
			switch (algorithm) {
				case NONE:
					signer = new NONE();
					break;
				case HS256:
					signer = new HS256();
					break;
				default:
					throw new SignException("The algorithm '" + algorithm.name() + "' is not support.");
			}
			signers.put(algorithm, signer);
			return signer;
		}
	}
}