From b52f6aa2041384e885e3bb6e71e079a2baa5dc48 Mon Sep 17 00:00:00 2001
From: William Cheng <wing328hk@gmail.com>
Date: Mon, 18 Sep 2023 10:09:54 +0800
Subject: [PATCH] better handling of const value

---
 .../org/openapitools/codegen/DefaultCodegen.java     | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index a342633b7e9..a863466865d 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -5365,7 +5365,17 @@ public class DefaultCodegen implements CodegenConfig {
                 codegenParameter.constant = toDefaultParameterValue(codegenProperty, enumSchema);
             }
         } else if (parameterSchema.getConst() != null) { // JSON Sschema keyword `const`
-            codegenParameter.constant = String.valueOf(parameterSchema.getConst());
+            Schema temp = null;
+            Pattern pattern = Pattern.compile("-?\\d+(\\.\\d+)?");
+            String constantValue = String.valueOf(parameterSchema.getConst());
+            if (pattern.matcher(constantValue).matches()) { // numeric constant value
+                temp = new NumberSchema();
+                temp.setDefault(constantValue);
+            } else { // constant value is a string
+                temp = new StringSchema();
+                temp.setDefault(constantValue);
+            }
+            codegenParameter.constant = toDefaultParameterValue(temp);
         }
 
         finishUpdatingParameter(codegenParameter, parameter);