BAEL-5978: Case Insensitive Enum Mapping in Spring Boot (#13061)

* BAEL-5978: Case Insensitive Enum Mapping in Spring Boot

* Move code to a new module: spring-boot-request-params

spring-boot-modules/spring-boot-request-params/src/main/java/com/baeldung/enummapping/EnumMappingMainApplication.java

@@ -0,0 +1,13 @@
+package com.baeldung.enummapping;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class EnumMappingMainApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(EnumMappingMainApplication.class, args);
+    }
+
+}

spring-boot-modules/spring-boot-request-params/src/main/java/com/baeldung/enummapping/config/EnumMappingConfig.java

@@ -0,0 +1,17 @@
+package com.baeldung.enummapping.config;
+
+import org.springframework.boot.convert.ApplicationConversionService;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.format.FormatterRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import com.baeldung.enummapping.converters.StringToLevelConverter;
+
+@Configuration
+public class EnumMappingConfig implements WebMvcConfigurer {
+    @Override
+    public void addFormatters(FormatterRegistry registry) {
+        ApplicationConversionService.configure(registry);
+        registry.addConverter(new StringToLevelConverter());
+    }
+}

spring-boot-modules/spring-boot-request-params/src/main/java/com/baeldung/enummapping/controllers/EnumMappingController.java

@@ -0,0 +1,30 @@
+package com.baeldung.enummapping.controllers;
+
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.enummapping.editors.LevelEditor;
+import com.baeldung.enummapping.enums.Level;
+
+@RestController
+@RequestMapping("enummapping")
+public class EnumMappingController {
+
+    @InitBinder
+    public void initBinder(WebDataBinder dataBinder) {
+        dataBinder.registerCustomEditor(Level.class, new LevelEditor());
+    }
+
+    @GetMapping("/get")
+    public String getByLevel(@RequestParam(required = false) Level level) {
+        if (level != null) {
+            return level.name();
+        }
+        return "undefined";
+    }
+
+}

spring-boot-modules/spring-boot-request-params/src/main/java/com/baeldung/enummapping/converters/StringToLevelConverter.java

@@ -0,0 +1,19 @@
+package com.baeldung.enummapping.converters;
+
+import org.apache.commons.lang3.EnumUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.core.convert.converter.Converter;
+
+import com.baeldung.enummapping.enums.Level;
+
+public class StringToLevelConverter implements Converter<String, Level> {
+
+    @Override
+    public Level convert(String source) {
+        if (StringUtils.isBlank(source)) {
+            return null;
+        }
+        return EnumUtils.getEnum(Level.class, source.toUpperCase());
+    }
+
+}

spring-boot-modules/spring-boot-request-params/src/main/java/com/baeldung/enummapping/editors/LevelEditor.java

@@ -0,0 +1,22 @@
+package com.baeldung.enummapping.editors;
+
+import java.beans.PropertyEditorSupport;
+
+import org.apache.commons.lang3.EnumUtils;
+import org.apache.commons.lang3.StringUtils;
+
+import com.baeldung.enummapping.enums.Level;
+
+public class LevelEditor extends PropertyEditorSupport {
+
+    @Override
+    public void setAsText(String text) {
+        if (StringUtils.isBlank(text)) {
+            setValue(null);
+        } else {
+            setValue(EnumUtils.getEnum(Level.class, text.toUpperCase()));
+        }
+
+    }
+
+}

spring-boot-modules/spring-boot-request-params/src/main/java/com/baeldung/enummapping/enums/Level.java

@@ -0,0 +1,7 @@
+package com.baeldung.enummapping.enums;
+
+public enum Level {
+
+    LOW, MEDIUM, HIGH
+
+}