fix: add hardening against NPE in caseInsensitive case

Author: davidricodias

modules/openapi-generator/src/main/resources/Java/libraries/native/modelEnum.mustache

@@ -75,7 +75,7 @@ import java.util.Map;
   @JsonCreator
 {{/jackson}}
   public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
-    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
+    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = {{#useEnumCaseInsensitive}}{{#isString}}value == null ? null : {{/isString}}{{/useEnumCaseInsensitive}}BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
     if (result != null) {
       return result;
     }

modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/modelEnum.mustache

@@ -58,7 +58,7 @@ import com.google.gson.stream.JsonWriter;
   }
 
   public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
-    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
+    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = {{#useEnumCaseInsensitive}}{{#isString}}value == null ? null : {{/isString}}{{/useEnumCaseInsensitive}}BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
     if (result != null) {
       return result;
     }

modules/openapi-generator/src/main/resources/Java/modelEnum.mustache

@@ -75,7 +75,7 @@ import java.util.Map;
   @JsonCreator
 {{/jackson}}
   public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
-    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
+    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = {{#useEnumCaseInsensitive}}{{#isString}}value == null ? null : {{/isString}}{{/useEnumCaseInsensitive}}BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
     if (result != null) {
       return result;
     }

modules/openapi-generator/src/main/resources/JavaJaxRS/modelEnum.mustache

@@ -57,7 +57,7 @@ import java.util.Map;
 
   @JsonCreator
   public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
-    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
+    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = {{#useEnumCaseInsensitive}}{{#isString}}value == null ? null : {{/isString}}{{/useEnumCaseInsensitive}}BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
     if (result != null) {
       return result;
     }

modules/openapi-generator/src/main/resources/java-helidon/server/libraries/mp/modelEnum.mustache

@@ -61,7 +61,7 @@ import java.util.Map;
 
     {{#jackson}}@JsonCreator{{/jackson}}
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
-    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
+    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = {{#useEnumCaseInsensitive}}{{#isString}}value == null ? null : {{/isString}}{{/useEnumCaseInsensitive}}BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
     if (result != null) {
       return result;
     }

modules/openapi-generator/src/main/resources/java-micronaut/common/model/modelEnum.mustache

@@ -63,7 +63,7 @@ import java.util.Map;
     @JsonCreator
     {{/jackson}}
     public static {{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
-    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
+    {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} result = {{#useEnumCaseInsensitive}}{{#isString}}value == null ? null : {{/isString}}{{/useEnumCaseInsensitive}}BY_VALUE.get({{#useEnumCaseInsensitive}}{{#isString}}value.toLowerCase(Locale.ROOT){{/isString}}{{^isString}}value{{/isString}}{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}value{{/useEnumCaseInsensitive}});
     if (result != null) {
       return result;
     }