refactor: Optimsed codes.

Move private and protected methods or fields to the last of java files.

simple-jwt-jjwt/src/main/java/cn/org/codecrafters/simplejwt/jjwt/JjwtTokenResolver.java

@@ -98,16 +98,6 @@ import java.util.*;
 @Slf4j
 public class JjwtTokenResolver implements TokenResolver<Jws<Claims>> {
 
-    private final GuidCreator<?> jtiCreator;
-
-    private final SecureDigestAlgorithm<SecretKey, SecretKey> algorithm;
-
-    private final String issuer;
-
-    private final SecretKey key;
-
-    private final JjwtTokenResolverConfig config = JjwtTokenResolverConfig.getInstance();
-
     /**
      * Create a resolver with specified algorithm, issuer, secret and guid strategy.
      *
@@ -432,6 +422,15 @@ public class JjwtTokenResolver implements TokenResolver<Jws<Claims>> {
         return renew(oldToken, Duration.ofMinutes(30), payload);
     }
 
+    /**
+     * Build a new token with specified data.
+     *
+     * @param expireAfter the validity time of the token
+     * @param audience    the audience of the token
+     * @param subject     the subject of the token
+     * @param claims      the data to be included in the token
+     * @return the built token
+     */
     private String buildToken(Duration expireAfter, String audience, String subject, Map<String, Object> claims) {
         var now = LocalDateTime.now();
         var builder = Jwts.builder()
@@ -453,4 +452,29 @@ public class JjwtTokenResolver implements TokenResolver<Jws<Claims>> {
         return builder.signWith(key, algorithm)
                 .compact();
     }
+
+    /**
+     * The ID creator for creating unique JWT IDs.
+     */
+    private final GuidCreator<?> jtiCreator;
+
+    /**
+     * The algorithm to sign this token.
+     */
+    private final SecureDigestAlgorithm<SecretKey, SecretKey> algorithm;
+
+    /**
+     * The issuer of this token.
+     */
+    private final String issuer;
+
+    /**
+     * The signature key of this token.
+     */
+    private final SecretKey key;
+
+    /**
+     * The config of this token resolver.
+     */
+    private final JjwtTokenResolverConfig config = JjwtTokenResolverConfig.getInstance();
 }

simple-jwt-jjwt/src/main/java/cn/org/codecrafters/simplejwt/jjwt/config/JjwtTokenResolverConfig.java

@@ -63,17 +63,6 @@ import java.util.Map;
  */
 public final class JjwtTokenResolverConfig implements TokenResolverConfig<SecureDigestAlgorithm<SecretKey, SecretKey>> {
 
-    private JjwtTokenResolverConfig() {
-    }
-
-    private static final Map<TokenAlgorithm, SecureDigestAlgorithm<SecretKey, SecretKey>> SUPPORTED_ALGORITHMS = new HashMap<>() {{
-        put(TokenAlgorithm.HS256, Jwts.SIG.HS256);
-        put(TokenAlgorithm.HS384, Jwts.SIG.HS384);
-        put(TokenAlgorithm.HS512, Jwts.SIG.HS512);
-    }};
-
-    private static JjwtTokenResolverConfig instance;
-
     public static JjwtTokenResolverConfig getInstance() {
         if (instance == null) {
             instance = new JjwtTokenResolverConfig();
@@ -106,4 +95,25 @@ public final class JjwtTokenResolverConfig implements TokenResolverConfig<Secure
         }
         return SUPPORTED_ALGORITHMS.get(algorithm);
     }
+
+    /**
+     * Private constructor will protect this class from being instantiated.
+     */
+    private JjwtTokenResolverConfig() {
+    }
+
+    /**
+     * A {@code Map} to map a {@link TokenAlgorithm} to {@link SecureDigestAlgorithm}.
+     */
+    private static final Map<TokenAlgorithm, SecureDigestAlgorithm<SecretKey, SecretKey>> SUPPORTED_ALGORITHMS = new HashMap<>() {{
+        put(TokenAlgorithm.HS256, Jwts.SIG.HS256);
+        put(TokenAlgorithm.HS384, Jwts.SIG.HS384);
+        put(TokenAlgorithm.HS512, Jwts.SIG.HS512);
+    }};
+
+    /**
+     * The instance of this config class.
+     */
+    private static JjwtTokenResolverConfig instance;
+
 }