[ISSUE apache#4808] Unify all null == object usage to standard `obj…

…ect == null` (apache#4809)

eventmesh-common/src/main/java/org/apache/eventmesh/common/protocol/tcp/Header.java

@@ -49,23 +49,23 @@ public Header(int code, String desc, String seq, Map<String, Object> properties)
     }
 
     public void putProperty(final String name, final Object value) {
-        if (null == this.properties) {
+        if (this.properties == null) {
             this.properties = new HashMap<>();
         }
 
         this.properties.put(name, value);
     }
 
     public Object getProperty(final String name) {
-        if (null == this.properties) {
+        if (this.properties == null) {
             return null;
         }
         return this.properties.get(name);
     }
 
     public String getStringProperty(final String name) {
         Object property = getProperty(name);
-        if (null == property) {
+        if (property == null) {
             return null;
         }
         return property.toString();

eventmesh-common/src/main/java/org/apache/eventmesh/common/protocol/tcp/codec/Codec.java

@@ -132,7 +132,7 @@ protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception
 
             try {
                 target = (ByteBuf) super.decode(ctx, in);
-                if (null == target) {
+                if (target == null) {
                     return null;
                 }
                 byte[] flagBytes = parseFlag(target);

eventmesh-common/src/main/java/org/apache/eventmesh/common/utils/IPUtils.java

@@ -161,7 +161,7 @@ private static String normalizeHostAddress(final InetAddress localHost) {
     }
 
     public static String parseChannelRemoteAddr(final Channel channel) {
-        if (null == channel) {
+        if (channel == null) {
             return "";
         }
         SocketAddress remote = channel.remoteAddress();

eventmesh-common/src/main/java/org/apache/eventmesh/common/utils/ThreadUtils.java

@@ -56,7 +56,7 @@ public static void sleep(long timeout, TimeUnit timeUnit) {
     }
 
     public static void sleepWithThrowException(long timeout, TimeUnit timeUnit) throws InterruptedException {
-        if (null == timeUnit) {
+        if (timeUnit == null) {
             return;
         }
         timeUnit.sleep(timeout);

eventmesh-connectors/eventmesh-connector-dingtalk/src/main/java/org/apache/eventmesh/connector/dingtalk/sink/connector/DingDingSinkConnector.java

@@ -127,7 +127,7 @@ public void put(List<ConnectRecord> sinkRecords) {
                 orgGroupSendHeaders.xAcsDingtalkAccessToken = accessToken;
 
                 String templateTypeKey = record.getExtension(ConnectRecordExtensionKeys.DINGTALK_TEMPLATE_TYPE);
-                if (null == templateTypeKey || "null".equals(templateTypeKey)) {
+                if (templateTypeKey == null || "null".equals(templateTypeKey)) {
                     templateTypeKey = DingDingMessageTemplateType.PLAIN_TEXT.getTemplateType();
                 }
                 DingDingMessageTemplateType templateType = DingDingMessageTemplateType.of(templateTypeKey);

eventmesh-connectors/eventmesh-connector-jdbc/src/main/java/org/apache/eventmesh/connector/jdbc/dialect/mysql/MysqlDatabaseDialect.java

@@ -162,7 +162,7 @@ public String getDefaultDatabase() {
 
     @Override
     public boolean databaseExists(String databaseName) throws CatalogException {
-        if (null == databaseName || databaseName.trim().isEmpty()) {
+        if (databaseName == null || databaseName.trim().isEmpty()) {
             return false;
         }
         List<String> databases = listDatabases();

eventmesh-connectors/eventmesh-connector-jdbc/src/main/java/org/apache/eventmesh/connector/jdbc/source/SourceJdbcTaskManager.java

@@ -64,7 +64,7 @@ public void init() {
     }
 
     private void doHandleEvent(Event event) {
-        if (null == event) {
+        if (event == null) {
             return;
         }
         JdbcConnectData jdbcConnectData = event.getJdbcConnectData();

eventmesh-connectors/eventmesh-connector-jdbc/src/main/java/org/apache/eventmesh/connector/jdbc/source/dialect/cdc/mysql/MysqlCdcEngine.java

@@ -289,7 +289,7 @@ public EventMeshGtidSet filterGtidSet(MysqlJdbcContext offsetContext, EventMeshG
      */
     private void eventMeshMysqlEventListener(Event event, MysqlJdbcContext context) {
 
-        if (null == event) {
+        if (event == null) {
             return;
         }
         final EventHeader eventHeader = event.getHeader();
@@ -366,7 +366,7 @@ public void run() {
             Event event = null;
             try {
                 event = eventQueue.poll(5, TimeUnit.SECONDS);
-                if (null == event) {
+                if (event == null) {
                     continue;
                 }
                 eventHandlers.getOrDefault(event.getHeader().getEventType(), ignore -> ignoreEvent(context, ignore)).accept(event);

eventmesh-connectors/eventmesh-connector-jdbc/src/main/java/org/apache/eventmesh/connector/jdbc/source/dialect/mysql/MysqlDataTypeConvertor.java

@@ -116,7 +116,7 @@ public EventMeshDataType<?> toEventMeshType(MysqlType connectorDataType, Map<Str
                 /**
                  *  @see <a href="https://dev.mysql.com/doc/refman/8.0/en/bit-type.html">Mysql doc</a>
                  */
-                if (null == dataTypeProperties) {
+                if (dataTypeProperties == null) {
                     return BytesEventMeshDataType.INSTANCE;
                 }
                 Integer precision = (Integer) dataTypeProperties.get(MysqlDataTypeConvertor.PRECISION);

eventmesh-connectors/eventmesh-connector-jdbc/src/main/java/org/apache/eventmesh/connector/jdbc/source/dialect/snapshot/mysql/MysqlSnapshotEngine.java

@@ -311,7 +311,7 @@ public void run() {
         while (isRunning) {
             try {
                 Event event = eventQueue.poll(5, TimeUnit.SECONDS);
-                if (null == event) {
+                if (event == null) {
                     continue;
                 }
                 consumers.forEach(consumer -> consumer.accept(event));

eventmesh-connectors/eventmesh-connector-jdbc/src/main/java/org/apache/eventmesh/connector/jdbc/table/catalog/mysql/MysqlDefaultValueConvertorImpl.java

@@ -60,7 +60,7 @@ public class MysqlDefaultValueConvertorImpl implements DefaultValueConvertor {
 
     @Override
     public Object parseDefaultValue(Column<?> column, String defaultValueExpression) {
-        if (null == defaultValueExpression) {
+        if (defaultValueExpression == null) {
             return null;
         }
         defaultValueExpression = defaultValueExpression.trim();

eventmesh-connectors/eventmesh-connector-lark/src/main/java/org/apache/eventmesh/connector/lark/sink/ImServiceHandler.java

@@ -230,7 +230,7 @@ private CreateMessageReq convertCreateMessageReq(ConnectRecord connectRecord) {
             .uuid(UUID.randomUUID().toString());
 
         String templateTypeKey = connectRecord.getExtension(ConnectRecordExtensionKeys.TEMPLATE_TYPE_4_LARK);
-        if (null == templateTypeKey || "null".equals(templateTypeKey)) {
+        if (templateTypeKey == null || "null".equals(templateTypeKey)) {
             templateTypeKey = LarkMessageTemplateType.PLAIN_TEXT.getTemplateKey();
         }
         LarkMessageTemplateType templateType = LarkMessageTemplateType.of(templateTypeKey);

eventmesh-connectors/eventmesh-connector-spring/src/main/java/org/apache/eventmesh/connector/spring/sink/EventMeshListenerBeanPostProcessor.java

@@ -97,7 +97,7 @@ public void run(String... args) throws Exception {
                 while (sinkConnector.isRunning()) {
                     try {
                         poll = sinkConnector.getQueue().poll(annotation.requestTimeout(), TimeUnit.SECONDS);
-                        if (null == poll || null == poll.getData()) {
+                        if (poll == null || poll.getData() == null) {
                             continue;
                         }
                         String messageBody = new String((byte[]) poll.getData());

eventmesh-examples/src/main/java/org/apache/eventmesh/tcp/demo/pub/cloudevents/SyncRequest.java

@@ -65,7 +65,7 @@ public static void main(String[] args) throws Exception {
             final Package response = client.rr(event, EventMeshCommon.DEFAULT_TIME_OUT_MILLS);
             // check-NPE EventFormat
             final EventFormat eventFormat = EventFormatProvider.getInstance().resolveFormat(JsonFormat.CONTENT_TYPE);
-            if (null == eventFormat) {
+            if (eventFormat == null) {
                 log.error("eventFormat is null. end the process");
                 return;
             }
@@ -75,7 +75,7 @@ public static void main(String[] args) throws Exception {
 
             // check-NPE CloudEventData
             final CloudEventData cloudEventData = replyEvent.getData();
-            if (null == cloudEventData) {
+            if (cloudEventData == null) {
                 log.error("replyEvent.data is null. end the process");
                 return;
             }

eventmesh-meta/eventmesh-meta-etcd/src/main/java/org/apache/eventmesh/meta/etcd/service/EtcdMetaService.java

@@ -93,7 +93,7 @@ public void init() throws MetaException {
         eventMeshRegisterInfoMap = new ConcurrentHashMap<>(ConfigurationContextUtil.KEYS.size());
         for (String key : ConfigurationContextUtil.KEYS) {
             CommonConfiguration commonConfiguration = ConfigurationContextUtil.get(key);
-            if (null == commonConfiguration) {
+            if (commonConfiguration == null) {
                 continue;
             }
             if (StringUtils.isBlank(commonConfiguration.getMetaStorageAddr())) {

eventmesh-meta/eventmesh-meta-nacos/src/main/java/org/apache/eventmesh/meta/nacos/service/NacosMetaService.java

@@ -109,7 +109,7 @@ public void init() throws MetaException {
         eventMeshRegisterInfoMap = new ConcurrentHashMap<>(ConfigurationContextUtil.KEYS.size());
         for (String key : ConfigurationContextUtil.KEYS) {
             CommonConfiguration commonConfiguration = ConfigurationContextUtil.get(key);
-            if (null == commonConfiguration) {
+            if (commonConfiguration == null) {
                 continue;
             }
             if (StringUtils.isBlank(commonConfiguration.getMetaStorageAddr())) {

eventmesh-meta/eventmesh-meta-zookeeper/src/main/java/org/apache/eventmesh/meta/zookeeper/service/ZookeeperMetaService.java

@@ -86,7 +86,7 @@ public void init() throws MetaException {
         eventMeshRegisterInfoMap = new ConcurrentHashMap<>(ConfigurationContextUtil.KEYS.size());
         for (String key : ConfigurationContextUtil.KEYS) {
             CommonConfiguration commonConfiguration = ConfigurationContextUtil.get(key);
-            if (null == commonConfiguration) {
+            if (commonConfiguration == null) {
                 continue;
             }
             if (StringUtils.isBlank(commonConfiguration.getMetaStorageAddr())) {
@@ -285,7 +285,7 @@ public void removeMetaData(String key) {
     public boolean register(EventMeshRegisterInfo eventMeshRegisterInfo) throws MetaException {
         try {
             String[] ipPort = eventMeshRegisterInfo.getEndPoint().split(ZookeeperConstant.IP_PORT_SEPARATOR);
-            if (null == ipPort || ipPort.length < 2) {
+            if (ipPort == null || ipPort.length < 2) {
                 return false;
             }
             String ip = ipPort[0];

eventmesh-openconnect/eventmesh-openconnect-offsetmgmt-plugin/eventmesh-openconnect-offsetmgmt-nacos/src/main/java/org/apache/eventmesh/openconnect/offsetmgmt/nacos/NacosConfigService.java

@@ -69,7 +69,7 @@ public void start() {
 
     // merge the updated connectorRecord & recordOffset to memory store
     public void mergeOffset(ConnectorRecordPartition connectorRecordPartition, RecordOffset recordOffset) {
-        if (null == connectorRecordPartition || connectorRecordPartition.getPartition().isEmpty()) {
+        if (connectorRecordPartition == null || connectorRecordPartition.getPartition().isEmpty()) {
             return;
         }
         if (positionStore.getKVMap().containsKey(connectorRecordPartition)) {
@@ -172,7 +172,7 @@ public void putPosition(ConnectorRecordPartition partition, RecordOffset positio
 
     @Override
     public void removePosition(List<ConnectorRecordPartition> partitions) {
-        if (null == partitions) {
+        if (partitions == null) {
             return;
         }
         for (ConnectorRecordPartition partition : partitions) {

eventmesh-protocol-plugin/eventmesh-protocol-cloudevents/src/main/java/org/apache/eventmesh/protocol/cloudevents/resolver/grpc/GrpcEventMeshCloudEventProtocolResolver.java

@@ -52,7 +52,7 @@ public static List<io.cloudevents.CloudEvent> buildBatchEvents(CloudEventBatch c
     }
 
     public static EventMeshCloudEventWrapper buildEventMeshCloudEvent(io.cloudevents.CloudEvent cloudEvent) {
-        if (null == cloudEvent) {
+        if (cloudEvent == null) {
             return new EventMeshCloudEventWrapper(null);
         }
         try {

eventmesh-protocol-plugin/eventmesh-protocol-meshmessage/src/main/java/org/apache/eventmesh/protocol/meshmessage/resolver/grpc/GrpcEventMeshCloudEventProtocolResolver.java

@@ -39,15 +39,15 @@ public class GrpcEventMeshCloudEventProtocolResolver {
     private static final EventFormat eventFormat = EventFormatProvider.getInstance().resolveFormat(ProtobufFormat.PROTO_CONTENT_TYPE);
 
     public static io.cloudevents.CloudEvent buildEvent(CloudEvent cloudEvent) {
-        if (null == cloudEvent) {
+        if (cloudEvent == null) {
             return null;
         }
         io.cloudevents.CloudEvent event = eventFormat.deserialize(cloudEvent.toByteArray());
         return event;
     }
 
     public static EventMeshCloudEventWrapper buildEventMeshCloudEvent(io.cloudevents.CloudEvent cloudEvent) {
-        if (null == cloudEvent) {
+        if (cloudEvent == null) {
             return new EventMeshCloudEventWrapper(null);
         }
         try {

eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/core/protocol/grpc/service/ServiceUtils.java

@@ -66,7 +66,7 @@ public static boolean validateCloudEventAttributes(CloudEvent cloudEvent) {
     }
 
     public static boolean validateCloudEventBatchAttributes(CloudEventBatch cloudEventBatch) {
-        if (null == cloudEventBatch || cloudEventBatch.getEventsCount() < 1) {
+        if (cloudEventBatch == null || cloudEventBatch.getEventsCount() < 1) {
             return false;
         }
         List<CloudEvent> eventsList = cloudEventBatch.getEventsList();
@@ -99,7 +99,7 @@ public static boolean validateCloudEventData(CloudEvent cloudEvent) {
     }
 
     public static boolean validateCloudEventBatchData(CloudEventBatch cloudEventBatch) {
-        if (null == cloudEventBatch || cloudEventBatch.getEventsCount() < 1) {
+        if (cloudEventBatch == null || cloudEventBatch.getEventsCount() < 1) {
             return false;
         }
         List<CloudEvent> eventsList = cloudEventBatch.getEventsList();

eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/util/HttpTinyClient.java

@@ -35,7 +35,7 @@ public class HttpTinyClient {
     public static HttpResult httpGet(String url, List<String> headers, List<String> paramValues,
         String encoding, long readTimeoutMs) throws IOException {
         String encodedContent = encodingParams(paramValues, encoding);
-        url += (null == encodedContent) ? "" : ("?" + encodedContent);
+        url += (encodedContent == null) ? "" : ("?" + encodedContent);
 
         HttpURLConnection conn = null;
         try {
@@ -65,7 +65,7 @@ public static HttpResult httpGet(String url, List<String> headers, List<String>
     private static String encodingParams(Collection<String> paramValues, String encoding)
         throws UnsupportedEncodingException {
         StringBuilder sb = new StringBuilder();
-        if (null == paramValues) {
+        if (paramValues == null) {
             return null;
         }
 

eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/util/RemotingHelper.java

@@ -48,7 +48,7 @@ public static SocketAddress string2SocketAddress(final String addr) {
     }
 
     public static String parseChannelRemoteAddr(final Channel channel) {
-        if (null == channel) {
+        if (channel == null) {
             return "";
         }
 
@@ -67,7 +67,7 @@ public static String parseChannelRemoteAddr(final Channel channel) {
     }
 
     public static String parseChannelLocalAddr(final Channel channel) {
-        if (null == channel) {
+        if (channel == null) {
             return "";
         }
 

eventmesh-runtime/src/test/java/org/apache/eventmesh/runtime/client/common/Codec.java

@@ -94,7 +94,7 @@ public void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) thro
             int bodyLength = 0;
 
             try {
-                if (null == in) {
+                if (in == null) {
                     return;
                 }
 

eventmesh-sdks/eventmesh-sdk-java/src/main/java/org/apache/eventmesh/client/grpc/producer/EventMeshMessageProducer.java

@@ -51,7 +51,7 @@ public EventMeshMessageProducer(EventMeshGrpcClientConfig clientConfig, Publishe
     @Override
     public Response publish(EventMeshMessage message) {
 
-        if (null == message) {
+        if (message == null) {
             return null;
         }
 

eventmesh-sdks/eventmesh-sdk-java/src/main/java/org/apache/eventmesh/client/grpc/util/EventMeshCloudEventBuilder.java

@@ -236,7 +236,7 @@ public static <T> CloudEventBatch buildEventMeshCloudEventBatch(final List<T> me
     @SuppressWarnings("unchecked")
     public static <T> T buildMessageFromEventMeshCloudEvent(final CloudEvent cloudEvent, final EventMeshProtocolType protocolType) {
 
-        if (null == cloudEvent) {
+        if (cloudEvent == null) {
             return null;
         }
         final String seq = EventMeshCloudEventUtils.getSeqNum(cloudEvent);
@@ -251,7 +251,7 @@ public static <T> T buildMessageFromEventMeshCloudEvent(final CloudEvent cloudEv
 
                 });
         }
-        if (null == protocolType) {
+        if (protocolType == null) {
             return null;
         }
 

eventmesh-security-plugin/eventmesh-security-auth-token/src/main/java/org/apache/eventmesh/auth/token/impl/auth/AuthTokenUtils.java

@@ -55,7 +55,7 @@ public static void authTokenByPublicKey(AclProperties aclProperties) {
             token = token.replace("Bearer ", "");
             for (String key : ConfigurationContextUtil.KEYS) {
                 CommonConfiguration commonConfiguration = ConfigurationContextUtil.get(key);
-                if (null == commonConfiguration) {
+                if (commonConfiguration == null) {
                     continue;
                 }
                 if (StringUtils.isBlank(commonConfiguration.getEventMeshSecurityPublickey())) {
@@ -98,7 +98,7 @@ public static void helloTaskAuthTokenByPublicKey(AclProperties aclProperties) {
             token = token.replace("Bearer ", "");
             for (String key : ConfigurationContextUtil.KEYS) {
                 CommonConfiguration commonConfiguration = ConfigurationContextUtil.get(key);
-                if (null == commonConfiguration) {
+                if (commonConfiguration == null) {
                     continue;
                 }
                 if (StringUtils.isBlank(commonConfiguration.getEventMeshSecurityPublickey())) {

eventmesh-storage-plugin/eventmesh-storage-rocketmq/src/main/java/org/apache/eventmesh/storage/rocketmq/consumer/PushConsumerImpl.java

@@ -72,7 +72,7 @@ public PushConsumerImpl(final Properties properties) {
         }
         this.rocketmqPushConsumer.setNamesrvAddr(accessPoints.replace(',', ';'));
         String consumerGroup = clientConfig.getConsumerId();
-        if (null == consumerGroup || consumerGroup.isEmpty()) {
+        if (consumerGroup == null || consumerGroup.isEmpty()) {
             throw new StorageRuntimeException(
                 "Consumer Group is necessary for RocketMQ, please set it.");
         }

eventmesh-storage-plugin/eventmesh-storage-rocketmq/src/main/java/org/apache/rocketmq/client/impl/consumer/ConsumeMessageConcurrentlyService.java

@@ -441,7 +441,7 @@ public void run() {
                 hasException = true;
             }
             long consumeRT = System.currentTimeMillis() - beginTimestamp;
-            if (null == status) {
+            if (status == null) {
                 if (hasException) {
                     returnType = ConsumeReturnType.EXCEPTION;
                 } else {
@@ -457,7 +457,7 @@ public void run() {
                 Objects.requireNonNull(consumeMessageContext).getProps().put(MixAll.CONSUME_CONTEXT_TYPE, returnType.name());
             }
 
-            if (null == status) {
+            if (status == null) {
                 log.warn("consumeMessage return null, Group: {} Msgs: {} MQ: {}",
                     ConsumeMessageConcurrentlyService.this.consumerGroup,
                     msgs,