Add Java API for non-streaming ASR (#807)

sherpa-onnx/java-api/src/com/k2fsa/sherpa/onnx/OfflineStream.java

@@ -0,0 +1,49 @@
+// Copyright 2024 Xiaomi Corporation
+package com.k2fsa.sherpa.onnx;
+
+public class OfflineStream {
+    static {
+        System.loadLibrary("sherpa-onnx-jni");
+    }
+
+    private long ptr = 0;
+
+    public OfflineStream() {
+        this.ptr = 0;
+    }
+
+    public OfflineStream(long ptr) {
+        this.ptr = ptr;
+    }
+
+    public long getPtr() {
+        return ptr;
+    }
+
+    public void setPtr(long ptr) {
+        this.ptr = ptr;
+    }
+
+    public void acceptWaveform(float[] samples, int sampleRate) {
+        acceptWaveform(this.ptr, samples, sampleRate);
+    }
+
+    public void release() {
+        // stream object must be release after used
+        if (this.ptr == 0) {
+            return;
+        }
+        delete(this.ptr);
+        this.ptr = 0;
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        release();
+        super.finalize();
+    }
+
+    private native void acceptWaveform(long ptr, float[] samples, int sampleRate);
+
+    private native void delete(long ptr);
+}