Add nullable property support

Author: cognifloyd

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/CodegenModel.java

@@ -32,6 +32,7 @@ public class CodegenModel extends CodegenObject {
     public List<CodegenProperty> optionalVars = new ArrayList<CodegenProperty>(); // a list of optional properties
     public List<CodegenProperty> readOnlyVars = new ArrayList<CodegenProperty>(); // a list of read-only properties
     public List<CodegenProperty> readWriteVars = new ArrayList<CodegenProperty>(); // a list of properties for read, write
+    public List<CodegenProperty> nullableVars = new ArrayList<CodegenProperty>(); // a list of nullable properties
     public List<CodegenProperty> allVars;
     public List<CodegenProperty> parentVars = new ArrayList<>();
     public Map<String, Object> allowableValues;
@@ -180,6 +181,7 @@ public int hashCode() {
         result = 31 * result + (vars != null ? vars.hashCode() : 0);
         result = 31 * result + (requiredVars != null ? requiredVars.hashCode() : 0);
         result = 31 * result + (optionalVars != null ? optionalVars.hashCode() : 0);
+        result = 31 * result + (nullableVars != null ? nullableVars.hashCode() : 0);
         result = 31 * result + (allVars != null ? allVars.hashCode() : 0);
         result = 31 * result + (allowableValues != null ? allowableValues.hashCode() : 0);
         result = 31 * result + (mandatory != null ? mandatory.hashCode() : 0);
@@ -400,6 +402,14 @@ public void setReadWriteVars(List<CodegenProperty> readWriteVars) {
         this.readWriteVars = readWriteVars;
     }
 
+    public List<CodegenProperty> getNullableVars() {
+        return nullableVars;
+    }
+
+    public void setNullableVars(List<CodegenProperty> nullableVars) {
+        this.nullableVars = nullableVars;
+    }
+
     public List<CodegenProperty> getAllVars() {
         return allVars;
     }

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/CodegenProperty.java

@@ -37,6 +37,7 @@ public class CodegenProperty extends CodegenObject implements Cloneable {
     public boolean exclusiveMinimum;
     public boolean exclusiveMaximum;
     public boolean required, secondaryParam;
+    public boolean nullable;
 
     public List<String> _enum;
     public Map<String, Object> allowableValues;
@@ -279,6 +280,14 @@ public void setSecondaryParam(boolean secondaryParam) {
         this.secondaryParam = secondaryParam;
     }
 
+    public boolean getNullable() {
+        return nullable;
+    }
+
+    public void setNullable(boolean nullable) {
+        this.nullable = nullable;
+    }
+
     public List<String> get_enum() {
         return _enum;
     }
@@ -403,6 +412,7 @@ public int hashCode()
         result = prime * result + ((pattern == null) ? 0 : pattern.hashCode());
         result = prime * result + ((required  ? 13:31));
         result = prime * result + ((secondaryParam ? 13:31));
+        result = prime * result + ((nullable  ? 13:31));
         result = prime * result + ((setter == null) ? 0 : setter.hashCode());
         result = prime * result + ((unescapedDescription == null) ? 0 : unescapedDescription.hashCode());
         result = prime * result + ((vendorExtensions == null) ? 0 : vendorExtensions.hashCode());
@@ -503,6 +513,9 @@ public boolean equals(Object obj) {
         if (this.secondaryParam != other.secondaryParam) {
             return false;
         }
+        if (this.nullable != other.nullable) {
+            return false;
+        }
         if (this._enum != other._enum && (this._enum == null || !this._enum.equals(other._enum))) {
             return false;
         }