Format; Remove redundant files; Fix test

Author: a-d

foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/JacksonMixins.java

@@ -16,10 +16,16 @@ interface CreateChatCompletionStreamResponseMixIn {}
   @JsonTypeInfo(use = JsonTypeInfo.Id.NONE)
   interface CreateChatCompletionResponseMixIn {}
 
-  @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "object", defaultImpl = CreateChatCompletionResponse.class, visible = true)
+  @JsonTypeInfo(
+      use = JsonTypeInfo.Id.NAME,
+      property = "object",
+      defaultImpl = CreateChatCompletionResponse.class,
+      visible = true)
   @JsonSubTypes({
-      @JsonSubTypes.Type(value = CreateChatCompletionResponse.class, name="chat.completion"),
-      @JsonSubTypes.Type(value = CreateChatCompletionStreamResponse.class, name = "chat.completion.chunk"),
+    @JsonSubTypes.Type(value = CreateChatCompletionResponse.class, name = "chat.completion"),
+    @JsonSubTypes.Type(
+        value = CreateChatCompletionStreamResponse.class,
+        name = "chat.completion.chunk"),
   })
   public interface ChatCompletionCreate200ResponseMixIn {}
 }

foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/OpenAiChatCompletionDelta.java

@@ -1,23 +1,23 @@
 package com.sap.ai.sdk.foundationmodels.openai;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.fasterxml.jackson.annotation.JsonValue;
+import com.google.common.annotations.Beta;
 import com.sap.ai.sdk.core.common.StreamedDelta;
 import com.sap.ai.sdk.foundationmodels.openai.model2.ChatCompletionsCreate200Response;
 import com.sap.ai.sdk.foundationmodels.openai.model2.CreateChatCompletionResponse;
 import com.sap.ai.sdk.foundationmodels.openai.model2.CreateChatCompletionStreamResponse;
-import com.sap.ai.sdk.foundationmodels.openai.model2.CreateChatCompletionStreamResponseChoicesInner;
-import lombok.AccessLevel;
-import lombok.RequiredArgsConstructor;
-import lombok.Value;
-
-import java.util.List;
 import java.util.Objects;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
+import lombok.RequiredArgsConstructor;
+import lombok.Value;
 
-
+/**
+ * OpenAI chat completion output delta for streaming.
+ *
+ * @since 1.3.0
+ */
+@Beta
 @Value
 @RequiredArgsConstructor(onConstructor_ = @JsonCreator)
 public class OpenAiChatCompletionDelta implements StreamedDelta {
@@ -26,7 +26,7 @@ public class OpenAiChatCompletionDelta implements StreamedDelta {
   @Nonnull
   @Override
   public String getDeltaContent() {
-    if( getOriginalResponse() instanceof CreateChatCompletionStreamResponse response) {
+    if (getOriginalResponse() instanceof CreateChatCompletionStreamResponse response) {
       final var choices = response.getChoices();
       if (!choices.isEmpty() && choices.get(0).getIndex() == 0) {
         final var message = choices.get(0).getDelta();
@@ -35,7 +35,7 @@ public String getDeltaContent() {
         }
       }
     }
-    if( getOriginalResponse() instanceof CreateChatCompletionResponse response) {
+    if (getOriginalResponse() instanceof CreateChatCompletionResponse response) {
       final var choices = response.getChoices();
       if (!choices.isEmpty() && choices.get(0).getIndex() == 0) {
         final var delta = choices.get(0).getCustomField("delta"); // .getMessage() does not work
@@ -50,14 +50,14 @@ public String getDeltaContent() {
   @Nullable
   @Override
   public String getFinishReason() {
-    if( getOriginalResponse() instanceof CreateChatCompletionStreamResponse response) {
+    if (getOriginalResponse() instanceof CreateChatCompletionStreamResponse response) {
       final var choices = response.getChoices();
       if (!choices.isEmpty()) {
         final var finishReason = choices.get(0).getFinishReason();
         return finishReason != null ? finishReason.getValue() : null;
       }
     }
-    if( getOriginalResponse() instanceof CreateChatCompletionResponse response) {
+    if (getOriginalResponse() instanceof CreateChatCompletionResponse response) {
       final var choices = response.getChoices();
       if (!choices.isEmpty()) {
         final var finishReason = choices.get(0).getFinishReason();

foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/OpenAiClient.java

@@ -322,11 +322,17 @@ private <D extends StreamedDelta> Stream<D> streamRequest(
     try {
       final var client = ApacheHttpClient5Accessor.getHttpClient(destination);
       return new ClientStreamingHandler<>(deltaType, OpenAiError.class, OpenAiClientException::new)
-          .objectMapper(JACKSON
-              .addMixIn(CreateChatCompletionResponse.class, JacksonMixins.CreateChatCompletionResponseMixIn.class)
-              .addMixIn(CreateChatCompletionStreamResponse.class, JacksonMixins.CreateChatCompletionStreamResponseMixIn.class)
-              .addMixIn(ChatCompletionsCreate200Response.class, JacksonMixins.ChatCompletionCreate200ResponseMixIn.class)
-          )
+          .objectMapper(
+              JACKSON
+                  .addMixIn(
+                      CreateChatCompletionResponse.class,
+                      JacksonMixins.CreateChatCompletionResponseMixIn.class)
+                  .addMixIn(
+                      CreateChatCompletionStreamResponse.class,
+                      JacksonMixins.CreateChatCompletionStreamResponseMixIn.class)
+                  .addMixIn(
+                      ChatCompletionsCreate200Response.class,
+                      JacksonMixins.ChatCompletionCreate200ResponseMixIn.class))
           .handleStreamingResponse(client.executeOpen(null, request, null));
     } catch (final IOException e) {
       throw new OpenAiClientException("Request to OpenAI model failed", e);