Added a transformation to change a topic name to be all lowercase. Fixes #92. (#93)

* Added a transformation to change a topic name to be all lowercase. Fixes #92.

* Bumped to use 3.3.1-1

* Added xml-apis.

Author: jcustenborder

pom.xml

@@ -16,14 +16,15 @@
     limitations under the License.
 
 -->
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
-         xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+<project
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
+        xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>com.github.jcustenborder.kafka.connect</groupId>
         <artifactId>kafka-connect-parent</artifactId>
-        <version>2.6.1</version>
+        <version>3.3.1-1</version>
     </parent>
     <artifactId>kafka-connect-transform-common</artifactId>
     <version>0.1.0-SNAPSHOT</version>
@@ -49,8 +50,11 @@
         </developer>
     </developers>
     <scm>
-        <connection>scm:git:https://github.com/jcustenborder/kafka-connect-transform-common.git</connection>
-        <developerConnection>scm:git:[email protected]:jcustenborder/kafka-connect-transform-common.git</developerConnection>
+        <connection>scm:git:https://github.com/jcustenborder/kafka-connect-transform-common.git
+        </connection>
+        <developerConnection>
+            scm:git:[email protected]:jcustenborder/kafka-connect-transform-common.git
+        </developerConnection>
         <url>https://github.com/jcustenborder/kafka-connect-transform-common</url>
     </scm>
     <issueManagement>
@@ -61,8 +65,10 @@
         <dependency>
             <groupId>org.apache.kafka</groupId>
             <artifactId>connect-json</artifactId>
-            <version>${kafka.version}</version>
-            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.jcustenborder.kafka.connect</groupId>
+            <artifactId>connect-utils-jackson</artifactId>
         </dependency>
         <dependency>
             <groupId>org.reflections</groupId>
@@ -73,7 +79,7 @@
         <dependency>
             <groupId>com.github.jcustenborder.kafka.connect</groupId>
             <artifactId>connect-utils-testing-data</artifactId>
-            <version>[0.3.33,0.3.1000)</version>
+            <version>${connect-utils.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -85,7 +91,12 @@
             <groupId>xerces</groupId>
             <artifactId>xercesImpl</artifactId>
             <version>2.12.1</version>
-        </dependency>        
+        </dependency>
+        <dependency>
+            <groupId>xml-apis</groupId>
+            <artifactId>xml-apis</artifactId>
+            <version>1.4.01</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>
@@ -94,7 +105,8 @@
                 <artifactId>kafka-connect-maven-plugin</artifactId>
                 <configuration>
                     <confluentControlCenterIntegration>true</confluentControlCenterIntegration>
-                    <documentationUrl>https://jcustenborder.github.io/kafka-connect-documentation/</documentationUrl>
+                    <documentationUrl>https://jcustenborder.github.io/kafka-connect-documentation/
+                    </documentationUrl>
                     <componentTypes>
                         <componentType>transform</componentType>
                     </componentTypes>

src/main/java/com/github/jcustenborder/kafka/connect/transform/common/LowerCaseTopic.java

@@ -0,0 +1,61 @@
+/**
+ * Copyright © 2017 Jeremy Custenborder ([email protected])
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.github.jcustenborder.kafka.connect.transform.common;
+
+import com.github.jcustenborder.kafka.connect.utils.config.Description;
+import com.github.jcustenborder.kafka.connect.utils.config.Title;
+import org.apache.kafka.common.config.ConfigDef;
+import org.apache.kafka.common.utils.SystemTime;
+import org.apache.kafka.common.utils.Time;
+import org.apache.kafka.connect.connector.ConnectRecord;
+import org.apache.kafka.connect.transforms.Transformation;
+
+import java.util.Map;
+
+@Title("LowerCaseTopic")
+@Description("This transformation is used to change a topic name to be all lower case.")
+public class LowerCaseTopic<R extends ConnectRecord<R>> implements Transformation<R> {
+  Time time = SystemTime.SYSTEM;
+
+  @Override
+  public R apply(R record) {
+    return record.newRecord(
+        record.topic().toLowerCase(),
+        record.kafkaPartition(),
+        record.keySchema(),
+        record.key(),
+        record.valueSchema(),
+        record.value(),
+        record.timestamp(),
+        record.headers()
+    );
+  }
+
+  @Override
+  public ConfigDef config() {
+    return new ConfigDef();
+  }
+
+  @Override
+  public void close() {
+
+  }
+
+  @Override
+  public void configure(Map<String, ?> map) {
+
+  }
+}

src/test/java/com/github/jcustenborder/kafka/connect/transform/common/LowerCaseTopicTest.java

@@ -0,0 +1,35 @@
+package com.github.jcustenborder.kafka.connect.transform.common;
+
+import org.apache.kafka.common.record.TimestampType;
+import org.apache.kafka.common.utils.Time;
+import org.apache.kafka.connect.sink.SinkRecord;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+public class LowerCaseTopicTest {
+
+  @Test
+  public void test() {
+    final SinkRecord input = new SinkRecord(
+        "TeSt",
+        1,
+        null,
+        "",
+        null,
+        "",
+        1234123L,
+        12341312L,
+        TimestampType.NO_TIMESTAMP_TYPE
+    );
+    LowerCaseTopic<SinkRecord> transform = new LowerCaseTopic<>();
+    final SinkRecord actual = transform.apply(input);
+    assertEquals("test", actual.topic(), "Topic should match.");
+  }
+
+
+}

src/test/resources/com/github/jcustenborder/kafka/connect/transform/common/LowerCaseTopic/example.json

@@ -0,0 +1,15 @@
+{
+  "input" : {
+    "topic" : "TestTopic",
+    "kafkaPartition" : 1,
+    "key" : "",
+    "value" : "",
+    "timestamp" : 12341312,
+    "timestampType" : "NO_TIMESTAMP_TYPE",
+    "offset" : 1234123,
+    "headers" : [ ]
+  },
+  "description" : "This example will change the topic name to be all lower case.",
+  "name" : "Example",
+  "config" : { }
+}