[INLONG-11216][SDK] Transform support STR_TO_MAP() function (apache#1…

…1232)

inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/StrToMapFunction.java

@@ -0,0 +1,103 @@
+/*
+ * 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.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+/**
+ * StrToMapFunction
+ * description: str_to_map(string1, string2, string3) - Returns a map after splitting the string1 into key/value pairs
+ *              using delimiters. string2 is the pair delimiter, default is ‘,’. And string3 is the key-value delimiter,
+ *              default is ‘=’. Both pair delimiter and key-value delimiter are treated as regular expressions.So special
+ *              characters (e.g. <([{^-=$!|]})?*+.>) need to be properly escaped before using as a delimiter literally.
+ * for example: STR_TO_MAP('item1:10,item2:5,item3:2', ':', ',')--{'item1' -> 10, 'item2' -> 5, 'item3' -> 2}
+ */
+@TransformFunction(names = {"str_to_map"})
+public class StrToMapFunction implements ValueParser {
+
+    private ValueParser inputParser;
+
+    private ValueParser pairDelimiterParser;
+
+    private ValueParser kvDelimiterParser;
+
+    public StrToMapFunction(Function expr) {
+        List<Expression> expressions = expr.getParameters().getExpressions();
+        if (!expressions.isEmpty()) {
+            inputParser = OperatorTools.buildParser(expressions.get(0));
+            if (expressions.size() >= 2) {
+                pairDelimiterParser = OperatorTools.buildParser(expressions.get(1));
+                if (expressions.size() >= 3) {
+                    kvDelimiterParser = OperatorTools.buildParser(expressions.get(2));
+                }
+            }
+        }
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        Object inputStringObj = inputParser.parse(sourceData, rowIndex, context);
+        Object pairDelimiterStringObj = null;
+        String pairDelimiterString = null;
+        if (pairDelimiterParser != null) {
+            pairDelimiterStringObj = pairDelimiterParser.parse(sourceData, rowIndex, context);
+            pairDelimiterString = OperatorTools.parseString(pairDelimiterStringObj);
+        }
+        Object kvDelimiterStringObj = null;
+        String kvDelimiterString = null;
+        if (kvDelimiterParser != null) {
+            kvDelimiterStringObj = kvDelimiterParser.parse(sourceData, rowIndex, context);
+            kvDelimiterString = OperatorTools.parseString(kvDelimiterStringObj);
+        }
+        String inputString = OperatorTools.parseString(inputStringObj);
+
+        return getStringStringMap(pairDelimiterString, kvDelimiterString, inputString);
+    }
+
+    private Map<String, String> getStringStringMap(String pairDelimiterString, String kvDelimiterString,
+            String inputString) {
+        String pairDelimiter =
+                (pairDelimiterString == null || pairDelimiterString.isEmpty()) ? "," : escapeRegex(pairDelimiterString);
+        String keyValueDelimiter =
+                (kvDelimiterString == null || kvDelimiterString.isEmpty()) ? "=" : escapeRegex(kvDelimiterString);
+
+        Map<String, String> map = new LinkedHashMap<>();
+        String[] pairs = inputString.split(pairDelimiter);
+
+        for (String pair : pairs) {
+            if (pair.contains(keyValueDelimiter)) {
+                String[] keyValue = pair.split(keyValueDelimiter, 2);
+                map.put(keyValue[0], keyValue[1]);
+            }
+        }
+        return map;
+    }
+
+    private String escapeRegex(String delimiter) {
+        return delimiter.replaceAll("([\\\\^$|?*+\\[\\](){}])", "\\\\$1");
+    }
+}

inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestStrToMapFunction.java

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+/*
+ * 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.string;
+
+import org.apache.inlong.sdk.transform.decode.SourceDecoderFactory;
+import org.apache.inlong.sdk.transform.encode.SinkEncoderFactory;
+import org.apache.inlong.sdk.transform.pojo.TransformConfig;
+import org.apache.inlong.sdk.transform.process.TransformProcessor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.List;
+
+public class TestStrToMapFunction extends AbstractFunctionStringTestBase {
+
+    @Test
+    public void testStrToMapFunction() throws Exception {
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+
+        transformSql = "select str_to_map(string1) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: str_to_map('key1=value1,key2=value2,key3=value3')
+        data = "key1=value1,key2=value2,key3=value3|xxd|cloud|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={key1=value1, key2=value2, key3=value3}", output.get(0));
+
+        // case2: str_to_map('key1=,key2=,key3=')
+        data = "key1=,key2=,key3=|xxd|cloud|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={key1=, key2=, key3=}", output.get(0));
+
+        // case3: str_to_map('key1value1,key2value2,key3value3')
+        data = "key1value1,key2value2,key3value3|xxd|cloud|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={}", output.get(0));
+
+        // case4: str_to_map("")
+        data = "|xxd|cloud|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={}", output.get(0));
+
+        transformSql = "select str_to_map(string1,string2,string3) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case5: str_to_map("item1:10,item2:5,item3" , "," , ":")
+        data = "item1:10,item2:5,item3:2|,|:|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={item1=10, item2=5, item3=2}", output.get(0));
+
+        // case6: str_to_map("name->John!age->30!city->China" , "!" , "->")
+        data = "name->John!age->30!city->China|!|->|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={name=John, age=30, city=China}", output.get(0));
+
+        // case7: str_to_map("name->John!age->30!city->China" , null , "->")
+        data = "name->John,age->30,city->China||->|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={name=John, age=30, city=China}", output.get(0));
+    }
+}