improve coding styles

Author: JacksonTian

aliyun-java-sdk-core/src/main/java/com/aliyuncs/CommonRequest.java

@@ -509,30 +509,6 @@ public Map<String, String> getSysPathParameters() {
         return pathParameters;
     }
 
-    public void setSysAccept(FormatType type) {
-        this.accept = type;
-    }
-
-    public FormatType getSysAccept() {
-        return this.accept;
-    }
-
-    public SignatureVersion getSysSignatureVersion() {
-        return signatureVersion;
-    }
-
-    public void setSysSignatureVersion(SignatureVersion signatureVersion) {
-        this.signatureVersion = signatureVersion;
-    }
-
-    public SignatureAlgorithm getSysSignatureAlgorithm() {
-        return signatureAlgorithm;
-    }
-
-    public void setSysSignatureAlgorithm(SignatureAlgorithm signatureAlgorithm) {
-        this.signatureAlgorithm = signatureAlgorithm;
-    }
-
     public RetryPolicy getSysRetryPolicy() {
         return this.retryPolicy;
     }

aliyun-java-sdk-core/src/main/java/com/aliyuncs/auth/Signer.java

@@ -33,16 +33,6 @@ public abstract class Signer {
     private final static Signer HMAC_SM3 = new HmacSM3Signer();
     private final static Signer HMAC_SHA256 = new HmacSHA256Signer();
 
-    public static Signer getSigner(AlibabaCloudCredentials credentials) {
-        if (credentials instanceof KeyPairCredentials) {
-            return SHA256_WITH_RSA_SIGNER;
-        } else if (credentials instanceof BearerTokenCredentials) {
-            return BEARER_TOKEN_SIGNER;
-        } else {
-            return HMACSHA1_SIGNER;
-        }
-    }
-
     public static Signer getSigner(AlibabaCloudCredentials credentials, SignatureVersion signatureVersion, SignatureAlgorithm signatureAlgorithm) {
         switch (signatureVersion) {
             case V3:

aliyun-java-sdk-core/src/main/java/com/aliyuncs/endpoint/LocationServiceEndpointResolver.java

@@ -6,6 +6,7 @@
 import com.aliyuncs.exceptions.ClientException;
 import com.aliyuncs.http.FormatType;
 import com.aliyuncs.http.ProtocolType;
+import com.aliyuncs.utils.StringUtils;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -44,7 +45,7 @@ public static void setLocationServiceEndpoint(String endpoint) {
 
     @Override
     public String resolve(ResolveEndpointRequest request) throws ClientException {
-        if (request.locationServiceCode == null || request.locationServiceCode.length() == 0) {
+        if (StringUtils.isEmpty(request.locationServiceCode)) {
             return null;
         }
 
@@ -112,7 +113,6 @@ private void callLocationService(String key, ResolveEndpointRequest request) thr
         validProductCodes.add(request.productCodeLower);
         validRegionIds.add(request.regionId);
 
-
         boolean foundFlag = false;
         for (DescribeEndpointsResponse.Endpoint endpoint : response.getEndpoints()) {
             if (endpoint.getSerivceCode().equals(request.locationServiceCode)
@@ -149,11 +149,6 @@ public String makeEndpointKey(ResolveEndpointRequest request) {
         );
     }
 
-    @Deprecated
-    public String makeRegionIdKey(ResolveEndpointRequest request) {
-        return request.locationServiceCode + "." + request.regionId + "." + request.endpointType;
-    }
-
     public String makeEndpointKey(String productCode, String locationServiceCode, String regionId,
                                   String endpointType) {
         return productCode.toLowerCase() + "." + locationServiceCode + "."