Made util classes final with private constructor

SgtSilvio · SgtSilvio · commit 9fddde8dcaa5 · 2019-04-16T15:33:05.000+02:00
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/handler/auth/MqttAuthHandler.java b/src/main/java/com/hivemq/client/internal/mqtt/handler/auth/MqttAuthHandler.java
@@ -26,5 +26,4 @@
 public interface MqttAuthHandler extends ChannelHandler {
 
     @NotNull String NAME = "auth";
-
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/handler/publish/outgoing/MqttPublishFlowables.java b/src/main/java/com/hivemq/client/internal/mqtt/handler/publish/outgoing/MqttPublishFlowables.java
@@ -80,5 +80,4 @@ public void request(final long n) {
     public void cancel() {
         subscriber = null;
     }
-
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/MqttProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/MqttProperty.java
@@ -22,34 +22,35 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttProperty {
+public final class MqttProperty {
 
-    int PAYLOAD_FORMAT_INDICATOR = 0x01;
-    int MESSAGE_EXPIRY_INTERVAL = 0x02;
-    int CONTENT_TYPE = 0x03;
-    int RESPONSE_TOPIC = 0x08;
-    int CORRELATION_DATA = 0x09;
-    int SUBSCRIPTION_IDENTIFIER = 0x0B;
-    int SESSION_EXPIRY_INTERVAL = 0x11;
-    int ASSIGNED_CLIENT_IDENTIFIER = 0x12;
-    int SERVER_KEEP_ALIVE = 0x13;
-    int AUTHENTICATION_METHOD = 0x15;
-    int AUTHENTICATION_DATA = 0x16;
-    int REQUEST_PROBLEM_INFORMATION = 0x17;
-    int WILL_DELAY_INTERVAL = 0x18;
-    int REQUEST_RESPONSE_INFORMATION = 0x19;
-    int RESPONSE_INFORMATION = 0x1A;
-    int SERVER_REFERENCE = 0x1C;
-    int REASON_STRING = 0x1F;
-    int RECEIVE_MAXIMUM = 0x21;
-    int TOPIC_ALIAS_MAXIMUM = 0x22;
-    int TOPIC_ALIAS = 0x23;
-    int MAXIMUM_QOS = 0x24;
-    int RETAIN_AVAILABLE = 0x25;
-    int USER_PROPERTY = 0x26;
-    int MAXIMUM_PACKET_SIZE = 0x27;
-    int WILDCARD_SUBSCRIPTION_AVAILABLE = 0x28;
-    int SUBSCRIPTION_IDENTIFIERS_AVAILABLE = 0x29;
-    int SHARED_SUBSCRIPTION_AVAILABLE = 0x2A;
+    public static final int PAYLOAD_FORMAT_INDICATOR = 0x01;
+    public static final int MESSAGE_EXPIRY_INTERVAL = 0x02;
+    public static final int CONTENT_TYPE = 0x03;
+    public static final int RESPONSE_TOPIC = 0x08;
+    public static final int CORRELATION_DATA = 0x09;
+    public static final int SUBSCRIPTION_IDENTIFIER = 0x0B;
+    public static final int SESSION_EXPIRY_INTERVAL = 0x11;
+    public static final int ASSIGNED_CLIENT_IDENTIFIER = 0x12;
+    public static final int SERVER_KEEP_ALIVE = 0x13;
+    public static final int AUTHENTICATION_METHOD = 0x15;
+    public static final int AUTHENTICATION_DATA = 0x16;
+    public static final int REQUEST_PROBLEM_INFORMATION = 0x17;
+    public static final int WILL_DELAY_INTERVAL = 0x18;
+    public static final int REQUEST_RESPONSE_INFORMATION = 0x19;
+    public static final int RESPONSE_INFORMATION = 0x1A;
+    public static final int SERVER_REFERENCE = 0x1C;
+    public static final int REASON_STRING = 0x1F;
+    public static final int RECEIVE_MAXIMUM = 0x21;
+    public static final int TOPIC_ALIAS_MAXIMUM = 0x22;
+    public static final int TOPIC_ALIAS = 0x23;
+    public static final int MAXIMUM_QOS = 0x24;
+    public static final int RETAIN_AVAILABLE = 0x25;
+    public static final int USER_PROPERTY = 0x26;
+    public static final int MAXIMUM_PACKET_SIZE = 0x27;
+    public static final int WILDCARD_SUBSCRIPTION_AVAILABLE = 0x28;
+    public static final int SUBSCRIPTION_IDENTIFIERS_AVAILABLE = 0x29;
+    public static final int SHARED_SUBSCRIPTION_AVAILABLE = 0x2A;
 
+    private MqttProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/auth/MqttAuthProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/auth/MqttAuthProperty.java
@@ -24,11 +24,12 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttAuthProperty {
+public final class MqttAuthProperty {
 
-    int AUTHENTICATION_METHOD = MqttProperty.AUTHENTICATION_METHOD;
-    int AUTHENTICATION_DATA = MqttProperty.AUTHENTICATION_DATA;
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int AUTHENTICATION_METHOD = MqttProperty.AUTHENTICATION_METHOD;
+    public static final int AUTHENTICATION_DATA = MqttProperty.AUTHENTICATION_DATA;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttAuthProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/connect/MqttConnectProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/connect/MqttConnectProperty.java
@@ -24,16 +24,17 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttConnectProperty {
+public final class MqttConnectProperty {
 
-    int SESSION_EXPIRY_INTERVAL = MqttProperty.SESSION_EXPIRY_INTERVAL;
-    int AUTHENTICATION_METHOD = MqttProperty.AUTHENTICATION_METHOD;
-    int AUTHENTICATION_DATA = MqttProperty.AUTHENTICATION_DATA;
-    int REQUEST_PROBLEM_INFORMATION = MqttProperty.REQUEST_PROBLEM_INFORMATION;
-    int REQUEST_RESPONSE_INFORMATION = MqttProperty.REQUEST_RESPONSE_INFORMATION;
-    int RECEIVE_MAXIMUM = MqttProperty.RECEIVE_MAXIMUM;
-    int TOPIC_ALIAS_MAXIMUM = MqttProperty.TOPIC_ALIAS_MAXIMUM;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
-    int MAXIMUM_PACKET_SIZE = MqttProperty.MAXIMUM_PACKET_SIZE;
+    public static final int SESSION_EXPIRY_INTERVAL = MqttProperty.SESSION_EXPIRY_INTERVAL;
+    public static final int AUTHENTICATION_METHOD = MqttProperty.AUTHENTICATION_METHOD;
+    public static final int AUTHENTICATION_DATA = MqttProperty.AUTHENTICATION_DATA;
+    public static final int REQUEST_PROBLEM_INFORMATION = MqttProperty.REQUEST_PROBLEM_INFORMATION;
+    public static final int REQUEST_RESPONSE_INFORMATION = MqttProperty.REQUEST_RESPONSE_INFORMATION;
+    public static final int RECEIVE_MAXIMUM = MqttProperty.RECEIVE_MAXIMUM;
+    public static final int TOPIC_ALIAS_MAXIMUM = MqttProperty.TOPIC_ALIAS_MAXIMUM;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int MAXIMUM_PACKET_SIZE = MqttProperty.MAXIMUM_PACKET_SIZE;
 
+    private MqttConnectProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/connect/connack/MqttConnAckProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/connect/connack/MqttConnAckProperty.java
@@ -24,24 +24,25 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttConnAckProperty {
+public final class MqttConnAckProperty {
 
-    int SESSION_EXPIRY_INTERVAL = MqttProperty.SESSION_EXPIRY_INTERVAL;
-    int ASSIGNED_CLIENT_IDENTIFIER = MqttProperty.ASSIGNED_CLIENT_IDENTIFIER;
-    int SERVER_KEEP_ALIVE = MqttProperty.SERVER_KEEP_ALIVE;
-    int AUTHENTICATION_METHOD = MqttProperty.AUTHENTICATION_METHOD;
-    int AUTHENTICATION_DATA = MqttProperty.AUTHENTICATION_DATA;
-    int RESPONSE_INFORMATION = MqttProperty.RESPONSE_INFORMATION;
-    int SERVER_REFERENCE = MqttProperty.SERVER_REFERENCE;
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int RECEIVE_MAXIMUM = MqttProperty.RECEIVE_MAXIMUM;
-    int TOPIC_ALIAS_MAXIMUM = MqttProperty.TOPIC_ALIAS_MAXIMUM;
-    int MAXIMUM_QOS = MqttProperty.MAXIMUM_QOS;
-    int RETAIN_AVAILABLE = MqttProperty.RETAIN_AVAILABLE;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
-    int MAXIMUM_PACKET_SIZE = MqttProperty.MAXIMUM_PACKET_SIZE;
-    int WILDCARD_SUBSCRIPTION_AVAILABLE = MqttProperty.WILDCARD_SUBSCRIPTION_AVAILABLE;
-    int SUBSCRIPTION_IDENTIFIERS_AVAILABLE = MqttProperty.SUBSCRIPTION_IDENTIFIERS_AVAILABLE;
-    int SHARED_SUBSCRIPTION_AVAILABLE = MqttProperty.SHARED_SUBSCRIPTION_AVAILABLE;
+    public static final int SESSION_EXPIRY_INTERVAL = MqttProperty.SESSION_EXPIRY_INTERVAL;
+    public static final int ASSIGNED_CLIENT_IDENTIFIER = MqttProperty.ASSIGNED_CLIENT_IDENTIFIER;
+    public static final int SERVER_KEEP_ALIVE = MqttProperty.SERVER_KEEP_ALIVE;
+    public static final int AUTHENTICATION_METHOD = MqttProperty.AUTHENTICATION_METHOD;
+    public static final int AUTHENTICATION_DATA = MqttProperty.AUTHENTICATION_DATA;
+    public static final int RESPONSE_INFORMATION = MqttProperty.RESPONSE_INFORMATION;
+    public static final int SERVER_REFERENCE = MqttProperty.SERVER_REFERENCE;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int RECEIVE_MAXIMUM = MqttProperty.RECEIVE_MAXIMUM;
+    public static final int TOPIC_ALIAS_MAXIMUM = MqttProperty.TOPIC_ALIAS_MAXIMUM;
+    public static final int MAXIMUM_QOS = MqttProperty.MAXIMUM_QOS;
+    public static final int RETAIN_AVAILABLE = MqttProperty.RETAIN_AVAILABLE;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int MAXIMUM_PACKET_SIZE = MqttProperty.MAXIMUM_PACKET_SIZE;
+    public static final int WILDCARD_SUBSCRIPTION_AVAILABLE = MqttProperty.WILDCARD_SUBSCRIPTION_AVAILABLE;
+    public static final int SUBSCRIPTION_IDENTIFIERS_AVAILABLE = MqttProperty.SUBSCRIPTION_IDENTIFIERS_AVAILABLE;
+    public static final int SHARED_SUBSCRIPTION_AVAILABLE = MqttProperty.SHARED_SUBSCRIPTION_AVAILABLE;
 
+    private MqttConnAckProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/disconnect/MqttDisconnectProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/disconnect/MqttDisconnectProperty.java
@@ -24,11 +24,12 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttDisconnectProperty {
+public final class MqttDisconnectProperty {
 
-    int SESSION_EXPIRY_INTERVAL = MqttProperty.SESSION_EXPIRY_INTERVAL;
-    int SERVER_REFERENCE = MqttProperty.SERVER_REFERENCE;
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int SESSION_EXPIRY_INTERVAL = MqttProperty.SESSION_EXPIRY_INTERVAL;
+    public static final int SERVER_REFERENCE = MqttProperty.SERVER_REFERENCE;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttDisconnectProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/publish/MqttPublishProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/publish/MqttPublishProperty.java
@@ -24,15 +24,16 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttPublishProperty {
+public final class MqttPublishProperty {
 
-    int PAYLOAD_FORMAT_INDICATOR = MqttProperty.PAYLOAD_FORMAT_INDICATOR;
-    int MESSAGE_EXPIRY_INTERVAL = MqttProperty.MESSAGE_EXPIRY_INTERVAL;
-    int CORRELATION_DATA = MqttProperty.CORRELATION_DATA;
-    int CONTENT_TYPE = MqttProperty.CONTENT_TYPE;
-    int RESPONSE_TOPIC = MqttProperty.RESPONSE_TOPIC;
-    int SUBSCRIPTION_IDENTIFIER = MqttProperty.SUBSCRIPTION_IDENTIFIER;
-    int TOPIC_ALIAS = MqttProperty.TOPIC_ALIAS;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int PAYLOAD_FORMAT_INDICATOR = MqttProperty.PAYLOAD_FORMAT_INDICATOR;
+    public static final int MESSAGE_EXPIRY_INTERVAL = MqttProperty.MESSAGE_EXPIRY_INTERVAL;
+    public static final int CORRELATION_DATA = MqttProperty.CORRELATION_DATA;
+    public static final int CONTENT_TYPE = MqttProperty.CONTENT_TYPE;
+    public static final int RESPONSE_TOPIC = MqttProperty.RESPONSE_TOPIC;
+    public static final int SUBSCRIPTION_IDENTIFIER = MqttProperty.SUBSCRIPTION_IDENTIFIER;
+    public static final int TOPIC_ALIAS = MqttProperty.TOPIC_ALIAS;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttPublishProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/publish/MqttWillPublishProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/publish/MqttWillPublishProperty.java
@@ -24,14 +24,15 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttWillPublishProperty {
+public final class MqttWillPublishProperty {
 
-    int PAYLOAD_FORMAT_INDICATOR = MqttProperty.PAYLOAD_FORMAT_INDICATOR;
-    int MESSAGE_EXPIRY_INTERVAL = MqttProperty.MESSAGE_EXPIRY_INTERVAL;
-    int CORRELATION_DATA = MqttProperty.CORRELATION_DATA;
-    int CONTENT_TYPE = MqttProperty.CONTENT_TYPE;
-    int RESPONSE_TOPIC = MqttProperty.RESPONSE_TOPIC;
-    int WILL_DELAY_INTERVAL = MqttProperty.WILL_DELAY_INTERVAL;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int PAYLOAD_FORMAT_INDICATOR = MqttProperty.PAYLOAD_FORMAT_INDICATOR;
+    public static final int MESSAGE_EXPIRY_INTERVAL = MqttProperty.MESSAGE_EXPIRY_INTERVAL;
+    public static final int CORRELATION_DATA = MqttProperty.CORRELATION_DATA;
+    public static final int CONTENT_TYPE = MqttProperty.CONTENT_TYPE;
+    public static final int RESPONSE_TOPIC = MqttProperty.RESPONSE_TOPIC;
+    public static final int WILL_DELAY_INTERVAL = MqttProperty.WILL_DELAY_INTERVAL;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttWillPublishProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/publish/puback/MqttPubAckProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/publish/puback/MqttPubAckProperty.java
@@ -24,9 +24,10 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttPubAckProperty {
+public final class MqttPubAckProperty {
 
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttPubAckProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/publish/pubcomp/MqttPubCompProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/publish/pubcomp/MqttPubCompProperty.java
@@ -24,9 +24,10 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttPubCompProperty {
+public final class MqttPubCompProperty {
 
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttPubCompProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/publish/pubrec/MqttPubRecProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/publish/pubrec/MqttPubRecProperty.java
@@ -24,9 +24,10 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttPubRecProperty {
+public final class MqttPubRecProperty {
 
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttPubRecProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/publish/pubrel/MqttPubRelProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/publish/pubrel/MqttPubRelProperty.java
@@ -24,9 +24,10 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttPubRelProperty {
+public final class MqttPubRelProperty {
 
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttPubRelProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/subscribe/MqttSubscribeProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/subscribe/MqttSubscribeProperty.java
@@ -22,9 +22,10 @@
 /**
  * @author Silvio Giebl
  */
-public interface MqttSubscribeProperty {
+public final class MqttSubscribeProperty {
 
-    int SUBSCRIPTION_IDENTIFIER = MqttProperty.SUBSCRIPTION_IDENTIFIER;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int SUBSCRIPTION_IDENTIFIER = MqttProperty.SUBSCRIPTION_IDENTIFIER;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttSubscribeProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/subscribe/suback/MqttSubAckProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/subscribe/suback/MqttSubAckProperty.java
@@ -24,9 +24,10 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttSubAckProperty {
+public final class MqttSubAckProperty {
 
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttSubAckProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/unsubscribe/MqttUnsubscribeProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/unsubscribe/MqttUnsubscribeProperty.java
@@ -22,8 +22,9 @@
 /**
  * @author Silvio Giebl
  */
-public interface MqttUnsubscribeProperty {
+public final class MqttUnsubscribeProperty {
 
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttUnsubscribeProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/message/unsubscribe/unsuback/MqttUnsubAckProperty.java b/src/main/java/com/hivemq/client/internal/mqtt/message/unsubscribe/unsuback/MqttUnsubAckProperty.java
@@ -24,9 +24,10 @@
  *
  * @author Silvio Giebl
  */
-public interface MqttUnsubAckProperty {
+public final class MqttUnsubAckProperty {
 
-    int REASON_STRING = MqttProperty.REASON_STRING;
-    int USER_PROPERTY = MqttProperty.USER_PROPERTY;
+    public static final int REASON_STRING = MqttProperty.REASON_STRING;
+    public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;
 
+    private MqttUnsubAckProperty() {}
 }
diff --git a/src/main/java/com/hivemq/client/internal/mqtt/util/MqttChecks.java b/src/main/java/com/hivemq/client/internal/mqtt/util/MqttChecks.java
@@ -54,7 +54,7 @@
 /**
  * @author Silvio Giebl
  */
-public class MqttChecks {
+public final class MqttChecks {
 
     private MqttChecks() {}
 
diff --git a/src/main/java/com/hivemq/client/internal/util/ByteArrayUtil.java b/src/main/java/com/hivemq/client/internal/util/ByteArrayUtil.java
@@ -22,7 +22,7 @@
 /**
  * @author Silvio Giebl
  */
-public class ByteArrayUtil {
+public final class ByteArrayUtil {
 
     private ByteArrayUtil() {}
 
diff --git a/src/main/java/com/hivemq/client/internal/util/ByteBufferUtil.java b/src/main/java/com/hivemq/client/internal/util/ByteBufferUtil.java
@@ -26,7 +26,7 @@
 /**
  * @author Silvio Giebl
  */
-public class ByteBufferUtil {
+public final class ByteBufferUtil {
 
     private static final @NotNull byte[] EMPTY_BYTE_ARRAY = new byte[0];
 
diff --git a/src/main/java/com/hivemq/client/internal/util/Checks.java b/src/main/java/com/hivemq/client/internal/util/Checks.java
@@ -25,7 +25,7 @@
 /**
  * @author Silvio Giebl
  */
-public class Checks {
+public final class Checks {
 
     private Checks() {}
 
diff --git a/src/main/java/com/hivemq/client/internal/util/ExecutorUtil.java b/src/main/java/com/hivemq/client/internal/util/ExecutorUtil.java
@@ -25,7 +25,7 @@
 /**
  * @author Silvio Giebl
  */
-public class ExecutorUtil {
+public final class ExecutorUtil {
 
     private ExecutorUtil() {}
 
diff --git a/src/main/java/com/hivemq/client/internal/util/Pow2Util.java b/src/main/java/com/hivemq/client/internal/util/Pow2Util.java
@@ -20,7 +20,7 @@
 /**
  * @author Silvio Giebl
  */
-public class Pow2Util {
+public final class Pow2Util {
 
     private Pow2Util() {}
 
diff --git a/src/main/java/com/hivemq/client/internal/util/StringUtil.java b/src/main/java/com/hivemq/client/internal/util/StringUtil.java
diff --git a/src/main/java/com/hivemq/client/internal/util/UnsignedDataTypes.java b/src/main/java/com/hivemq/client/internal/util/UnsignedDataTypes.java
diff --git a/src/main/java/com/hivemq/client/internal/util/Utf8Util.java b/src/main/java/com/hivemq/client/internal/util/Utf8Util.java

Original file line number	Diff line number	Diff line change
`@@ -26,5 +26,4 @@`
`26`	`26`	`public interface MqttAuthHandler extends ChannelHandler {`
`27`	`27`
`28`	`28`	`@NotNull String NAME = "auth";`
`29`		`-`
`30`	`29`	`}`
Original file line number	Diff line number	Diff line change
`@@ -80,5 +80,4 @@ public void request(final long n) {`
`80`	`80`	`public void cancel() {`
`81`	`81`	`subscriber = null;`
`82`	`82`	`}`
`83`		`-`
`84`	`83`	`}`
Original file line number	Diff line number	Diff line change
`@@ -24,9 +24,10 @@`
`24`	`24`	`*`
`25`	`25`	`* @author Silvio Giebl`
`26`	`26`	`*/`
`27`		`-public interface MqttPubAckProperty {`
	`27`	`+public final class MqttPubAckProperty {`
`28`	`28`
`29`		`- int REASON_STRING = MqttProperty.REASON_STRING;`
`30`		`- int USER_PROPERTY = MqttProperty.USER_PROPERTY;`
	`29`	`+ public static final int REASON_STRING = MqttProperty.REASON_STRING;`
	`30`	`+ public static final int USER_PROPERTY = MqttProperty.USER_PROPERTY;`
`31`	`31`
	`32`	`+ private MqttPubAckProperty() {}`
`32`	`33`	`}`