1 files changed, 171 insertions, 0 deletions
diff --git a/java/jau/direct_bt/DBTGattDesc.java b/java/jau/direct_bt/DBTGattDesc.java
new file mode 100644
index 00000000..7c080e39
--- /dev/null
+++ b/java/jau/direct_bt/DBTGattDesc.java
@@ -0,0 +1,171 @@
+/**
+ * Author: Sven Gothel <[email protected]>
+ * Copyright (c) 2020 Gothel Software e.K.
+ * Copyright (c) 2020 ZAFENA AB
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package jau.direct_bt;
+
+import java.lang.ref.WeakReference;
+import java.util.Arrays;
+
+import org.direct_bt.BTException;
+import org.direct_bt.BTGattDesc;
+import org.direct_bt.BTNotification;
+import org.direct_bt.BTType;
+
+public class DBTGattDesc extends DBTObject implements BTGattDesc
+{
+    /** Descriptor's characteristic weak back-reference */
+    final WeakReference<DBTGattChar> wbr_characteristic;
+
+    /** Type of Descriptor */
+    private final String type_uuid;
+
+    /**
+     * Characteristic Descriptor Handle
+     * <p>
+     * Attribute handles are unique for each device (server) (BT Core Spec v5.2: Vol 3, Part F Protocol..: 3.2.2 Attribute Handle).
+     * </p>
+     */
+    private final short handle;
+
+    private byte[] cachedValue;
+    private BTNotification<byte[]> valueNotificationCB = null;
+
+    private boolean updateCachedValue(final byte[] value, final boolean notify) {
+        boolean valueChanged = false;
+        if( null == cachedValue || cachedValue.length != value.length ) {
+            cachedValue = new byte[value.length];
+            valueChanged = true;
+        } else if( !Arrays.equals(value, cachedValue) ) {
+            valueChanged = true;
+        }
+        if( valueChanged ) {
+            System.arraycopy(value, 0, cachedValue, 0, value.length);
+            if( notify && null != valueNotificationCB ) {
+                valueNotificationCB.run(cachedValue);
+            }
+        }
+        return valueChanged;
+    }
+
+   /* pp */ DBTGattDesc(final long nativeInstance, final DBTGattChar characteristic,
+                              final String type_uuid, final short handle, final byte[] value)
+    {
+        super(nativeInstance, handle /* hash */);
+        this.wbr_characteristic = new WeakReference<DBTGattChar>(characteristic);
+        this.type_uuid = type_uuid;
+        this.handle = handle;
+        this.cachedValue = value;
+    }
+
+    @Override
+    public synchronized void close() {
+        if( !isValid() ) {
+            return;
+        }
+        disableValueNotifications();
+        super.close();
+    }
+
+    @Override
+    public boolean equals(final Object obj)
+    {
+        if (obj == null || !(obj instanceof DBTGattDesc)) {
+            return false;
+        }
+        final DBTGattDesc other = (DBTGattDesc)obj;
+        return handle == other.handle; /** unique attribute handles */
+    }
+
+    @Override
+    public String getUUID() { return type_uuid; }
+
+    @Override
+    public BTType getBluetoothType() { return class_type(); }
+
+    static BTType class_type() { return BTType.GATT_DESCRIPTOR; }
+
+    @Override
+    public final BTGattDesc clone()
+    { throw new UnsupportedOperationException(); } // FIXME
+
+    @Override
+    public final DBTGattChar getCharacteristic() { return wbr_characteristic.get(); }
+
+    @Override
+    public final byte[] getValue() { return cachedValue; }
+
+    @Override
+    public final byte[] readValue() {
+        final byte[] value = readValueImpl();
+        updateCachedValue(value, true);
+        return cachedValue;
+    }
+
+    @Override
+    public final boolean writeValue(final byte[] value) throws BTException {
+        final boolean res = writeValueImpl(value);
+        if( res ) {
+            updateCachedValue(value, false);
+        }
+        return res;
+    }
+
+    @Override
+    public final synchronized void enableValueNotifications(final BTNotification<byte[]> callback) {
+        valueNotificationCB = callback;
+    }
+
+    @Override
+    public final synchronized void disableValueNotifications() {
+        valueNotificationCB = null;
+    }
+
+    /**
+     * Characteristic Descriptor Handle
+     * <p>
+     * Attribute handles are unique for each device (server) (BT Core Spec v5.2: Vol 3, Part F Protocol..: 3.2.2 Attribute Handle).
+     * </p>
+     */
+    public final short getHandle() { return handle; }
+
+    @Override
+    public final String toString() {
+        if( !isValid() ) {
+            return "Descriptor" + "\u271D" + "[uuid "+getUUID()+", handle 0x"+Integer.toHexString(handle)+"]";
+        }
+        return toStringImpl();
+    }
+
+    /* Native method calls: */
+
+    private native String toStringImpl();
+
+    private native byte[] readValueImpl();
+
+    private native boolean writeValueImpl(byte[] argValue) throws BTException;
+
+    @Override
+    protected native void deleteImpl(long nativeInstance);
+}