(improvement)(launcher)Move langchain4j related classes from launcher-common to common.

common/src/main/java/dev/langchain4j/model/embedding/S2OnnxEmbeddingModel.java

@@ -0,0 +1,61 @@
+package dev.langchain4j.model.embedding;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import org.apache.commons.lang3.StringUtils;
+
+/**
+ * An embedding model that runs within your Java application's process.
+ * Any BERT-based model (e.g., from HuggingFace) can be used, as long as it is in ONNX format.
+ * Information on how to convert models into ONNX format can be found <a
+ * href="https://huggingface.co/docs/optimum/exporters/onnx/usage_guides/export_a_model">here</a>.
+ * Many models already converted to ONNX format are available <a href="https://huggingface.co/Xenova">here</a>.
+ * Copy from dev.langchain4j.model.embedding.OnnxEmbeddingModel.
+ */
+public class S2OnnxEmbeddingModel extends AbstractInProcessEmbeddingModel {
+
+    private final OnnxBertBiEncoder model;
+
+    /**
+     * @param pathToModel The path to the .onnx model file (e.g., "/home/me/model.onnx").
+     */
+    public S2OnnxEmbeddingModel(String pathToModel, String vocabularyPath) {
+        URL resource = AbstractInProcessEmbeddingModel.class.getResource("/bert-vocabulary-en.txt");
+        if (StringUtils.isNotBlank(vocabularyPath)) {
+            try {
+                resource = Paths.get(vocabularyPath).toUri().toURL();
+            } catch (MalformedURLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        model = loadFromFileSystem(Paths.get(pathToModel), resource);
+    }
+
+    /**
+     * @param pathToModel The path to the .onnx model file (e.g., "/home/me/model.onnx").
+     */
+    public S2OnnxEmbeddingModel(String pathToModel) {
+        this(pathToModel, null);
+    }
+
+    @Override
+    protected OnnxBertBiEncoder model() {
+        return model;
+    }
+
+    static OnnxBertBiEncoder loadFromFileSystem(Path pathToModel, URL vocabularyFile) {
+        try {
+            return new OnnxBertBiEncoder(
+                    Files.newInputStream(pathToModel),
+                    vocabularyFile,
+                    PoolingMode.MEAN
+            );
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}