- replaced GSON with Jackson

- Updated readme
- general cleanup

src/main/java/io/github/amithkoujalgi/ollama4j/core/OllamaAPI.java

@@ -1,6 +1,6 @@
 package io.github.amithkoujalgi.ollama4j.core;
 
-import com.google.gson.Gson;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import io.github.amithkoujalgi.ollama4j.core.exceptions.OllamaBaseException;
 import io.github.amithkoujalgi.ollama4j.core.models.*;
 import org.apache.hc.client5.http.classic.methods.HttpDelete;
@@ -30,10 +30,13 @@ import java.util.stream.Collectors;
  */
 @SuppressWarnings({"DuplicatedCode", "ExtractMethodRecommender"})
 public class OllamaAPI {
+
     private static final Logger logger = LoggerFactory.getLogger(OllamaAPI.class);
     private final String host;
     private boolean verbose = false;
 
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
     /**
      * Instantiates the Ollama API.
      *
@@ -76,8 +79,7 @@ public class OllamaAPI {
                 responseString = EntityUtils.toString(responseEntity, "UTF-8");
             }
             if (statusCode == 200) {
-                Models m = new Gson().fromJson(responseString, Models.class);
-                return m.getModels();
+                return objectMapper.readValue(responseString, ListModelsResponse.class).getModels();
             } else {
                 throw new OllamaBaseException(statusCode + " - " + responseString);
             }
@@ -109,7 +111,7 @@ public class OllamaAPI {
                 responseString = EntityUtils.toString(responseEntity, "UTF-8");
             }
             if (statusCode == 200) {
-                return new Gson().fromJson(responseString, ModelDetail.class);
+                return objectMapper.readValue(responseString, ModelDetail.class);
             } else {
                 throw new OllamaBaseException(statusCode + " - " + responseString);
             }
@@ -234,7 +236,6 @@ public class OllamaAPI {
      * @throws IOException
      */
     public String ask(String ollamaModelType, String promptText) throws OllamaBaseException, IOException {
-        Gson gson = new Gson();
         OllamaRequestModel ollamaRequestModel = new OllamaRequestModel(ollamaModelType, promptText);
         URL obj = new URL(this.host + "/api/generate");
         HttpURLConnection con = (HttpURLConnection) obj.openConnection();
@@ -250,7 +251,7 @@ public class OllamaAPI {
                 String inputLine;
                 StringBuilder response = new StringBuilder();
                 while ((inputLine = in.readLine()) != null) {
-                    OllamaResponseModel ollamaResponseModel = gson.fromJson(inputLine, OllamaResponseModel.class);
+                    OllamaResponseModel ollamaResponseModel = objectMapper.readValue(inputLine, OllamaResponseModel.class);
                     if (!ollamaResponseModel.getDone()) {
                         response.append(ollamaResponseModel.getResponse());
                     }

src/main/java/io/github/amithkoujalgi/ollama4j/core/models/ListModelsResponse.java

@@ -2,7 +2,7 @@ package io.github.amithkoujalgi.ollama4j.core.models;
 
 import java.util.List;
 
-public class Models {
+public class ListModelsResponse {
     private List<Model> models;
 
     public List<Model> getModels() {

src/main/java/io/github/amithkoujalgi/ollama4j/core/models/ModelDetail.java

@@ -1,6 +1,7 @@
 package io.github.amithkoujalgi.ollama4j.core.models;
 
-import com.google.gson.GsonBuilder;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 public class ModelDetail {
     private String license, modelfile, parameters, template;
@@ -39,6 +40,13 @@ public class ModelDetail {
 
     @Override
     public String toString() {
-        return new GsonBuilder().setPrettyPrinting().create().toJson(this);
+        try {
+            return new ObjectMapper()
+                    .writer()
+                    .withDefaultPrettyPrinter()
+                    .writeValueAsString(this);
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
     }
 }

src/main/java/io/github/amithkoujalgi/ollama4j/core/models/OllamaAsyncResultCallback.java

@@ -1,38 +1,42 @@
 package io.github.amithkoujalgi.ollama4j.core.models;
 
-import com.google.gson.Gson;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import io.github.amithkoujalgi.ollama4j.core.exceptions.OllamaBaseException;
 
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
+import java.util.LinkedList;
+import java.util.Queue;
 
+@SuppressWarnings("DuplicatedCode")
 public class OllamaAsyncResultCallback extends Thread {
     private final HttpURLConnection connection;
     private String result;
     private boolean isDone;
+    private final ObjectMapper objectMapper = new ObjectMapper();
+    private final Queue<String> queue = new LinkedList<>();
 
     public OllamaAsyncResultCallback(HttpURLConnection connection) {
         this.connection = connection;
         this.isDone = false;
         this.result = "";
+        this.queue.add("");
     }
 
     @Override
     public void run() {
-        Gson gson = new Gson();
         int responseCode = 0;
         try {
             responseCode = this.connection.getResponseCode();
             if (responseCode == HttpURLConnection.HTTP_OK) {
-                try (BufferedReader in =
-                             new BufferedReader(new InputStreamReader(this.connection.getInputStream()))) {
+                try (BufferedReader in = new BufferedReader(new InputStreamReader(this.connection.getInputStream()))) {
                     String inputLine;
                     StringBuilder response = new StringBuilder();
                     while ((inputLine = in.readLine()) != null) {
-                        OllamaResponseModel ollamaResponseModel =
-                                gson.fromJson(inputLine, OllamaResponseModel.class);
+                        OllamaResponseModel ollamaResponseModel = objectMapper.readValue(inputLine, OllamaResponseModel.class);
+                        queue.add(ollamaResponseModel.getResponse());
                         if (!ollamaResponseModel.getDone()) {
                             response.append(ollamaResponseModel.getResponse());
                         }
@@ -42,8 +46,7 @@ public class OllamaAsyncResultCallback extends Thread {
                     this.result = response.toString();
                 }
             } else {
-                throw new OllamaBaseException(
-                        connection.getResponseCode() + " - " + connection.getResponseMessage());
+                throw new OllamaBaseException(connection.getResponseCode() + " - " + connection.getResponseMessage());
             }
         } catch (IOException | OllamaBaseException e) {
             this.isDone = true;
@@ -55,7 +58,15 @@ public class OllamaAsyncResultCallback extends Thread {
         return isDone;
     }
 
+    /**
+     * Returns the final response when the execution completes. Does not return intermediate results.
+     * @return response text
+     */
     public String getResponse() {
         return result;
     }
+
+    public Queue<String> getStream() {
+        return queue;
+    }
 }

src/main/java/io/github/amithkoujalgi/ollama4j/core/models/OllamaRequestModel.java

@@ -1,6 +1,8 @@
 package io.github.amithkoujalgi.ollama4j.core.models;
 
-import com.google.gson.Gson;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 public class OllamaRequestModel {
     private String model;
@@ -29,6 +31,13 @@ public class OllamaRequestModel {
 
     @Override
     public String toString() {
-        return new Gson().toJson(this);
+        try {
+            return new ObjectMapper()
+                    .writer()
+                    .withDefaultPrettyPrinter()
+                    .writeValueAsString(this);
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
     }
 }