Support the empty string as an enumeration value

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -303,6 +303,10 @@ public String toEnumValue(String value, String datatype) {
      * @return the sanitized variable name for enum
      */
     public String toEnumVarName(String value, String datatype) {
+        if (value.length() == 0) {
+            return "EMPTY";
+        }
+
         String var = value.replaceAll("\\W+", "_").toUpperCase();
         if (var.matches("\\d.*")) {
             return "_" + var;

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractCSharpCodegen.java

@@ -615,6 +615,10 @@ public void setSourceFolder(String sourceFolder) {
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (name.length() == 0) {
+            return "Empty";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(name) != null) {
             return camelize(getSymbolName(name));

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java

@@ -808,6 +808,10 @@ public String toEnumName(CodegenProperty property) {
 
     @Override
     public String toEnumVarName(String value, String datatype) {
+        if (value.length() == 0) {
+            return "EMPTY";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(value) != null) {
             return getSymbolName(value).toUpperCase();

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractPhpCodegen.java

@@ -589,6 +589,10 @@ public String toEnumDefaultValue(String value, String datatype) {
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (name.length() == 0) {
+            return "EMPTY";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(name) != null) {
             return (getSymbolName(name)).toUpperCase();

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractTypeScriptClientCodegen.java

@@ -286,6 +286,10 @@ public String toEnumDefaultValue(String value, String datatype) {
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (name.length() == 0) {
+            return "Empty";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(name) != null) {
             return camelize(getSymbolName(name));

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/CSharpClientCodegen.java

@@ -494,6 +494,10 @@ public String toEnumValue(String value, String datatype) {
 
     @Override
     public String toEnumVarName(String value, String datatype) {
+        if (value.length() == 0) {
+            return "Empty";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(value) != null) {
             return camelize(getSymbolName(value));

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavascriptClientCodegen.java

@@ -1021,6 +1021,10 @@ public String toEnumName(CodegenProperty property) {
 
     @Override
     public String toEnumVarName(String value, String datatype) {
+        if (value.length() == 0) {
+            return "empty";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(value) != null) {
             return (getSymbolName(value)).toUpperCase();

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/NancyFXServerCodegen.java

@@ -292,6 +292,10 @@ public void postProcessModelProperty(final CodegenModel model, final CodegenProp
 
     @Override
     public String toEnumVarName(final String name, final String datatype) {
+        if (name.length() == 0) {
+            return "Empty";
+        }
+
         final String enumName = camelize(
                 sanitizeName(name)
                 .replaceFirst("^_", "")

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java

@@ -644,6 +644,10 @@ public String toEnumDefaultValue(String value, String datatype) {
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (name.length() == 0) {
+            return "EMPTY";
+        }
+
         // number
         if ("int".equals(datatype) || "double".equals(datatype) || "float".equals(datatype)) {
             String varName = name;

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/RubyClientCodegen.java

@@ -566,6 +566,10 @@ public String toEnumValue(String value, String datatype) {
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (name.length() == 0) {
+            return "EMPTY";
+        }
+
         // number
         if ("Integer".equals(datatype) || "Float".equals(datatype)) {
             String varName = name;

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/Swift3Codegen.java

@@ -513,6 +513,10 @@ public String toEnumDefaultValue(String value, String datatype) {
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        if (name.length() == 0) {
+            return "empty";
+        }
+
         // for symbol, e.g. $, #
         if (getSymbolName(name) != null) {
             return camelize(WordUtils.capitalizeFully(getSymbolName(name).toUpperCase()), true);

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SwiftCodegen.java

@@ -388,6 +388,10 @@ public CodegenProperty fromProperty(String name, Property p) {
 
     @SuppressWarnings("static-method")
     public String toSwiftyEnumName(String value) {
+        if (value.length() == 0) {
+            return "Empty";
+        }
+
         if (value.matches("^-?\\d*\\.{0,1}\\d+.*")) { // starts with number
             value = "Number" + value;
             value = value.replaceAll("-", "Minus");

modules/swagger-codegen/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -1067,6 +1067,7 @@ definitions:
         enum:
           - UPPER
           - lower
+          - ''
       enum_integer:
         type: integer
         format: int32

samples/client/petstore/csharp/SwaggerClient/src/IO.Swagger/Model/EnumTest.cs

@@ -46,7 +46,13 @@ public enum EnumStringEnum
             /// Enum Lower for "lower"
             /// </summary>
             [EnumMember(Value = "lower")]
-            Lower
+            Lower,
+
+            /// <summary>
+            /// Enum Empty for ""
+            /// </summary>
+            [EnumMember(Value = "")]
+            Empty
         }
 
         /// <summary>

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/src/IO.Swagger/Model/EnumTest.cs

@@ -49,7 +49,13 @@ public enum EnumStringEnum
             /// Enum Lower for "lower"
             /// </summary>
             [EnumMember(Value = "lower")]
-            Lower
+            Lower,
+
+            /// <summary>
+            /// Enum Empty for ""
+            /// </summary>
+            [EnumMember(Value = "")]
+            Empty
         }
 
         /// <summary>

samples/client/petstore/java/feign/src/main/java/io/swagger/client/model/EnumTest.java

@@ -31,7 +31,9 @@ public class EnumTest {
   public enum EnumStringEnum {
     UPPER("UPPER"),
 
-    LOWER("lower");
+    LOWER("lower"),
+
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/jersey1/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/jersey1/src/main/java/io/swagger/client/model/EnumTest.java

@@ -31,7 +31,9 @@ public class EnumTest {
   public enum EnumStringEnum {
     UPPER("UPPER"),
 
-    LOWER("lower");
+    LOWER("lower"),
+
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/jersey2-java6/docs/EnumTest.md

@@ -15,6 +15,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/jersey2-java6/src/main/java/io/swagger/client/model/EnumTest.java

@@ -42,7 +42,9 @@ public class EnumTest {
   public enum EnumStringEnum {
     UPPER("UPPER"),
 
-    LOWER("lower");
+    LOWER("lower"),
+
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/jersey2-java8/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/jersey2-java8/src/main/java/io/swagger/client/model/EnumTest.java

@@ -31,7 +31,9 @@ public class EnumTest {
   public enum EnumStringEnum {
     UPPER("UPPER"),
 
-    LOWER("lower");
+    LOWER("lower"),
+
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/jersey2/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/jersey2/src/main/java/io/swagger/client/model/EnumTest.java

@@ -31,7 +31,9 @@ public class EnumTest {
   public enum EnumStringEnum {
     UPPER("UPPER"),
 
-    LOWER("lower");
+    LOWER("lower"),
+
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/okhttp-gson-parcelableModel/docs/EnumTest.md

@@ -15,6 +15,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/io/swagger/client/model/EnumTest.java

@@ -45,7 +45,10 @@ public enum EnumStringEnum {
     UPPER("UPPER"),
 
     @SerializedName("lower")
-    LOWER("lower");
+    LOWER("lower"),
+
+    @SerializedName("")
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/okhttp-gson/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/model/EnumTest.java

@@ -32,7 +32,10 @@ public enum EnumStringEnum {
     UPPER("UPPER"),
 
     @SerializedName("lower")
-    LOWER("lower");
+    LOWER("lower"),
+
+    @SerializedName("")
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/retrofit/src/main/java/io/swagger/client/model/EnumTest.java

@@ -32,7 +32,10 @@ public enum EnumStringEnum {
     UPPER("UPPER"),
 
     @SerializedName("lower")
-    LOWER("lower");
+    LOWER("lower"),
+
+    @SerializedName("")
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/retrofit2-play24/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/retrofit2-play24/src/main/java/io/swagger/client/model/EnumTest.java

@@ -32,7 +32,9 @@ public class EnumTest {
   public enum EnumStringEnum {
     UPPER("UPPER"),
 
-    LOWER("lower");
+    LOWER("lower"),
+
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/retrofit2/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/retrofit2/src/main/java/io/swagger/client/model/EnumTest.java

@@ -32,7 +32,10 @@ public enum EnumStringEnum {
     UPPER("UPPER"),
 
     @SerializedName("lower")
-    LOWER("lower");
+    LOWER("lower"),
+
+    @SerializedName("")
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/java/retrofit2rx/docs/EnumTest.md

@@ -16,6 +16,7 @@ Name | Value
 ---- | -----
 UPPER | "UPPER"
 LOWER | "lower"
+EMPTY | ""
 
 
 <a name="EnumIntegerEnum"></a>

samples/client/petstore/java/retrofit2rx/src/main/java/io/swagger/client/model/EnumTest.java

@@ -32,7 +32,10 @@ public enum EnumStringEnum {
     UPPER("UPPER"),
 
     @SerializedName("lower")
-    LOWER("lower");
+    LOWER("lower"),
+
+    @SerializedName("")
+    EMPTY("");
 
     private String value;
 

samples/client/petstore/javascript-promise/docs/EnumTest.md

@@ -17,6 +17,8 @@ Name | Type | Description | Notes
 
 * `lower` (value: `"lower"`)
 
+* `empty` (value: `""`)
+
 
 
 

samples/client/petstore/javascript-promise/src/model/EnumTest.js

@@ -111,7 +111,12 @@
      * value: "lower"
      * @const
      */
-    "lower": "lower"  };
+    "lower": "lower",
+    /**
+     * value: ""
+     * @const
+     */
+    "empty": ""  };
 
   /**
    * Allowed values for the <code>enum_integer</code> property.

samples/client/petstore/javascript/docs/EnumTest.md

@@ -17,6 +17,8 @@ Name | Type | Description | Notes
 
 * `lower` (value: `"lower"`)
 
+* `empty` (value: `""`)
+