Better handling of any type in v3.1 spec

modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

@@ -911,10 +911,20 @@ private Schema processNormalize31Spec(Schema schema, Set<Schema> visitedSchemas)
             return schema;
         }
 
-        if (schema == null || schema.getTypes() == null) {
+        if (schema == null) {
             return null;
         }
 
+        if (schema instanceof JsonSchema &&
+                schema.get$schema() == null &&
+                schema.getTypes() == null && schema.getType() == null) {
+            // convert any type in v3.1 to empty schema (any type in v3.0 spec), any type example:
+            // components:
+            //  schemas:
+            //    any_type: {}
+            return new Schema();
+        }
+
         // process null
         if (schema.getTypes().contains("null")) {
             schema.setNullable(true);

modules/openapi-generator/src/main/java/org/openapitools/codegen/examples/ExampleGenerator.java

@@ -224,6 +224,10 @@ private List<Map<String, String>> generate(Object example, List<String> mediaTyp
     }
 
     private Object resolvePropertyToExample(String propertyName, String mediaType, Schema property, Set<String> processedModels) {
+        if (property == null) {
+            LOGGER.error("Property schema shouldn't be null. Please report the issue to the openapi-generator team.");
+            return "";
+        }
         LOGGER.debug("Resolving example for property {}...", property);
         if (property.getExample() != null) {
             LOGGER.debug("Example set in openapi spec, returning example: '{}'", property.getExample().toString());

modules/openapi-generator/src/test/resources/3_1/java/petstore.yaml

@@ -819,3 +819,6 @@ components:
           default: red
     simple_text:
       type: string
+    any_type_test:
+      properties:
+        any_type_property: {}

samples/client/petstore/java/okhttp-gson-3.1/.openapi-generator/FILES

@@ -6,6 +6,7 @@ api/openapi.yaml
 build.gradle
 build.sbt
 docs/Animal.md
+docs/AnyTypeTest.md
 docs/Cat.md
 docs/Category.md
 docs/Dog.md
@@ -56,6 +57,7 @@ src/main/java/org/openapitools/client/auth/OAuthOkHttpClient.java
 src/main/java/org/openapitools/client/auth/RetryingOAuth.java
 src/main/java/org/openapitools/client/model/AbstractOpenApiSchema.java
 src/main/java/org/openapitools/client/model/Animal.java
+src/main/java/org/openapitools/client/model/AnyTypeTest.java
 src/main/java/org/openapitools/client/model/Cat.java
 src/main/java/org/openapitools/client/model/Category.java
 src/main/java/org/openapitools/client/model/Dog.java

samples/client/petstore/java/okhttp-gson-3.1/README.md

@@ -140,6 +140,7 @@ Class | Method | HTTP request | Description
 ## Documentation for Models
 
  - [Animal](docs/Animal.md)
+ - [AnyTypeTest](docs/AnyTypeTest.md)
  - [Cat](docs/Cat.md)
  - [Category](docs/Category.md)
  - [Dog](docs/Dog.md)

samples/client/petstore/java/okhttp-gson-3.1/api/openapi.yaml

@@ -879,6 +879,9 @@ components:
       - className
     simple_text:
       type: string
+    any_type_test:
+      properties:
+        any_type_property: {}
     updatePetWithForm_request:
       properties:
         name:

samples/client/petstore/java/okhttp-gson-3.1/docs/AnyTypeTest.md

@@ -0,0 +1,13 @@
+
+
+# AnyTypeTest
+
+
+## Properties
+
+| Name | Type | Description | Notes |
+|------------ | ------------- | ------------- | -------------|
+|**anyTypeProperty** | **Object** |  |  [optional] |
+
+
+

samples/client/petstore/java/okhttp-gson-3.1/src/main/java/org/openapitools/client/JSON.java

@@ -122,6 +122,7 @@ private static Class getClassByDiscriminator(Map classByDiscriminatorValue, Stri
         gsonBuilder.registerTypeAdapter(OffsetDateTime.class, offsetDateTimeTypeAdapter);
         gsonBuilder.registerTypeAdapter(LocalDate.class, localDateTypeAdapter);
         gsonBuilder.registerTypeAdapter(byte[].class, byteArrayAdapter);
+        gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.AnyTypeTest.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.Cat.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.Category.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.Dog.CustomTypeAdapterFactory());

samples/client/petstore/java/okhttp-gson-3.1/src/main/java/org/openapitools/client/model/AnyTypeTest.java

@@ -0,0 +1,291 @@
+/*
+ * OpenAPI Petstore
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+package org.openapitools.client.model;
+
+import java.util.Objects;
+import com.google.gson.TypeAdapter;
+import com.google.gson.annotations.JsonAdapter;
+import com.google.gson.annotations.SerializedName;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.util.Arrays;
+import org.openapitools.jackson.nullable.JsonNullable;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.TypeAdapterFactory;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.openapitools.client.JSON;
+
+/**
+ * AnyTypeTest
+ */
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen")
+public class AnyTypeTest {
+  public static final String SERIALIZED_NAME_ANY_TYPE_PROPERTY = "any_type_property";
+  @SerializedName(SERIALIZED_NAME_ANY_TYPE_PROPERTY)
+  private Object anyTypeProperty = null;
+
+  public AnyTypeTest() {
+  }
+
+  public AnyTypeTest anyTypeProperty(Object anyTypeProperty) {
+    this.anyTypeProperty = anyTypeProperty;
+    return this;
+  }
+
+   /**
+   * Get anyTypeProperty
+   * @return anyTypeProperty
+  **/
+  @javax.annotation.Nullable
+  public Object getAnyTypeProperty() {
+    return anyTypeProperty;
+  }
+
+  public void setAnyTypeProperty(Object anyTypeProperty) {
+    this.anyTypeProperty = anyTypeProperty;
+  }
+
+  /**
+   * A container for additional, undeclared properties.
+   * This is a holder for any undeclared properties as specified with
+   * the 'additionalProperties' keyword in the OAS document.
+   */
+  private Map<String, Object> additionalProperties;
+
+  /**
+   * Set the additional (undeclared) property with the specified name and value.
+   * If the property does not already exist, create it otherwise replace it.
+   *
+   * @param key name of the property
+   * @param value value of the property
+   * @return the AnyTypeTest instance itself
+   */
+  public AnyTypeTest putAdditionalProperty(String key, Object value) {
+    if (this.additionalProperties == null) {
+        this.additionalProperties = new HashMap<String, Object>();
+    }
+    this.additionalProperties.put(key, value);
+    return this;
+  }
+
+  /**
+   * Return the additional (undeclared) property.
+   *
+   * @return a map of objects
+   */
+  public Map<String, Object> getAdditionalProperties() {
+    return additionalProperties;
+  }
+
+  /**
+   * Return the additional (undeclared) property with the specified name.
+   *
+   * @param key name of the property
+   * @return an object
+   */
+  public Object getAdditionalProperty(String key) {
+    if (this.additionalProperties == null) {
+        return null;
+    }
+    return this.additionalProperties.get(key);
+  }
+
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    AnyTypeTest anyTypeTest = (AnyTypeTest) o;
+    return Objects.equals(this.anyTypeProperty, anyTypeTest.anyTypeProperty)&&
+        Objects.equals(this.additionalProperties, anyTypeTest.additionalProperties);
+  }
+
+  private static <T> boolean equalsNullable(JsonNullable<T> a, JsonNullable<T> b) {
+    return a == b || (a != null && b != null && a.isPresent() && b.isPresent() && Objects.deepEquals(a.get(), b.get()));
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(anyTypeProperty, additionalProperties);
+  }
+
+  private static <T> int hashCodeNullable(JsonNullable<T> a) {
+    if (a == null) {
+      return 1;
+    }
+    return a.isPresent() ? Arrays.deepHashCode(new Object[]{a.get()}) : 31;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class AnyTypeTest {\n");
+    sb.append("    anyTypeProperty: ").append(toIndentedString(anyTypeProperty)).append("\n");
+    sb.append("    additionalProperties: ").append(toIndentedString(additionalProperties)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+
+
+  public static HashSet<String> openapiFields;
+  public static HashSet<String> openapiRequiredFields;
+
+  static {
+    // a set of all properties/fields (JSON key names)
+    openapiFields = new HashSet<String>();
+    openapiFields.add("any_type_property");
+
+    // a set of required properties/fields (JSON key names)
+    openapiRequiredFields = new HashSet<String>();
+  }
+
+ /**
+  * Validates the JSON Element and throws an exception if issues found
+  *
+  * @param jsonElement JSON Element
+  * @throws IOException if the JSON Element is invalid with respect to AnyTypeTest
+  */
+  public static void validateJsonElement(JsonElement jsonElement) throws IOException {
+      if (jsonElement == null) {
+        if (!AnyTypeTest.openapiRequiredFields.isEmpty()) { // has required fields but JSON element is null
+          throw new IllegalArgumentException(String.format("The required field(s) %s in AnyTypeTest is not found in the empty JSON string", AnyTypeTest.openapiRequiredFields.toString()));
+        }
+      }
+        JsonObject jsonObj = jsonElement.getAsJsonObject();
+  }
+
+  public static class CustomTypeAdapterFactory implements TypeAdapterFactory {
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
+       if (!AnyTypeTest.class.isAssignableFrom(type.getRawType())) {
+         return null; // this class only serializes 'AnyTypeTest' and its subtypes
+       }
+       final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
+       final TypeAdapter<AnyTypeTest> thisAdapter
+                        = gson.getDelegateAdapter(this, TypeToken.get(AnyTypeTest.class));
+
+       return (TypeAdapter<T>) new TypeAdapter<AnyTypeTest>() {
+           @Override
+           public void write(JsonWriter out, AnyTypeTest value) throws IOException {
+             JsonObject obj = thisAdapter.toJsonTree(value).getAsJsonObject();
+             obj.remove("additionalProperties");
+             // serialize additional properties
+             if (value.getAdditionalProperties() != null) {
+               for (Map.Entry<String, Object> entry : value.getAdditionalProperties().entrySet()) {
+                 if (entry.getValue() instanceof String)
+                   obj.addProperty(entry.getKey(), (String) entry.getValue());
+                 else if (entry.getValue() instanceof Number)
+                   obj.addProperty(entry.getKey(), (Number) entry.getValue());
+                 else if (entry.getValue() instanceof Boolean)
+                   obj.addProperty(entry.getKey(), (Boolean) entry.getValue());
+                 else if (entry.getValue() instanceof Character)
+                   obj.addProperty(entry.getKey(), (Character) entry.getValue());
+                 else {
+                   obj.add(entry.getKey(), gson.toJsonTree(entry.getValue()).getAsJsonObject());
+                 }
+               }
+             }
+             elementAdapter.write(out, obj);
+           }
+
+           @Override
+           public AnyTypeTest read(JsonReader in) throws IOException {
+             JsonElement jsonElement = elementAdapter.read(in);
+             validateJsonElement(jsonElement);
+             JsonObject jsonObj = jsonElement.getAsJsonObject();
+             // store additional fields in the deserialized instance
+             AnyTypeTest instance = thisAdapter.fromJsonTree(jsonObj);
+             for (Map.Entry<String, JsonElement> entry : jsonObj.entrySet()) {
+               if (!openapiFields.contains(entry.getKey())) {
+                 if (entry.getValue().isJsonPrimitive()) { // primitive type
+                   if (entry.getValue().getAsJsonPrimitive().isString())
+                     instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsString());
+                   else if (entry.getValue().getAsJsonPrimitive().isNumber())
+                     instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsNumber());
+                   else if (entry.getValue().getAsJsonPrimitive().isBoolean())
+                     instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsBoolean());
+                   else
+                     throw new IllegalArgumentException(String.format("The field `%s` has unknown primitive type. Value: %s", entry.getKey(), entry.getValue().toString()));
+                 } else if (entry.getValue().isJsonArray()) {
+                     instance.putAdditionalProperty(entry.getKey(), gson.fromJson(entry.getValue(), List.class));
+                 } else { // JSON object
+                     instance.putAdditionalProperty(entry.getKey(), gson.fromJson(entry.getValue(), HashMap.class));
+                 }
+               }
+             }
+             return instance;
+           }
+
+       }.nullSafe();
+    }
+  }
+
+ /**
+  * Create an instance of AnyTypeTest given an JSON string
+  *
+  * @param jsonString JSON string
+  * @return An instance of AnyTypeTest
+  * @throws IOException if the JSON string is invalid with respect to AnyTypeTest
+  */
+  public static AnyTypeTest fromJson(String jsonString) throws IOException {
+    return JSON.getGson().fromJson(jsonString, AnyTypeTest.class);
+  }
+
+ /**
+  * Convert an instance of AnyTypeTest to an JSON string
+  *
+  * @return JSON string
+  */
+  public String toJson() {
+    return JSON.getGson().toJson(this);
+  }
+}
+