ying-hua commented on code in PR #10854:
URL: https://github.com/apache/inlong/pull/10854#discussion_r1726757903
##########
inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/TestTransformStringFunctionsProcessor.java:
##########
@@ -184,4 +186,29 @@ public void testTrimFunction() throws Exception {
Assert.assertEquals(output3.get(0), "result=in long");
}
-}
+ @Test
+ public void testReverseFunction() throws Exception {
+ String transformSql1 = "select reverse(string1) from source";
+ TransformConfig config1 = new TransformConfig(transformSql1);
+ TransformProcessor<String, String> processor1 = TransformProcessor
+ .create(config1,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ // case1: reverse('apple')
+ List<String> output1 =
processor1.transform("apple|banana|cloud|2|1|3", new HashMap<>());
+ Assert.assertEquals(1, output1.size());
+ Assert.assertEquals(output1.get(0), "result=elppa");
+ // case2: reverse('ban ana ')
+ String transformSql2 = "select reverse(string2) from source";
+ TransformConfig config2 = new TransformConfig(transformSql2);
+ TransformProcessor<String, String> processor2 = TransformProcessor
+ .create(config2,
SourceDecoderFactory.createCsvDecoder(csvSource),
+ SinkEncoderFactory.createKvEncoder(kvSink));
+ List<String> output2 = processor2.transform("apple|ban ana
|cloud|2|1|3", new HashMap<>());
+ Assert.assertEquals(1, output2.size());
+ Assert.assertEquals(output2.get(0), "result= ana nab");
+ // case3: reverse(12345)
+ List<String> output3 =
processor1.transform("12345|banana|cloud|2|1|3", new HashMap<>());
+ Assert.assertEquals(1, output3.size());
+ Assert.assertEquals(output3.get(0), "result=54321");
+ }
Review Comment:
done
##########
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/ReverseFunction.java:
##########
@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.inlong.sdk.transform.process.function;
+
+import org.apache.inlong.sdk.transform.decode.SourceData;
+import org.apache.inlong.sdk.transform.process.Context;
+import org.apache.inlong.sdk.transform.process.operator.OperatorTools;
+import org.apache.inlong.sdk.transform.process.parser.ValueParser;
+
+import net.sf.jsqlparser.expression.Function;
+/**
+ * ReverseFunction
+ * description: reverse(string)--returns the string with the order of the
characters reversed.
+ * returns NULL if string is a empty string.
+ */
+public class ReverseFunction implements ValueParser {
+
+ private ValueParser stringParser;
+ public ReverseFunction(Function expr) {
+ stringParser =
OperatorTools.buildParser(expr.getParameters().getExpressions().get(0));
+ }
+
+ /**
+ * Parse and reverse string by reverse() in StringBuilder.
+ * parse
+ * @param sourceData
+ * @param rowIndex
+ * @param context
+ * @return
+ */
+
+ @Override
+ public Object parse(SourceData sourceData, int rowIndex, Context context) {
+ Object stringObj = stringParser.parse(sourceData, rowIndex, context);
+ String str = OperatorTools.parseString(stringObj);
Review Comment:
done
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