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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* 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 direct_bt.tinyb;
import java.lang.ref.WeakReference;
import java.util.Arrays;
import org.tinyb.BluetoothException;
import org.tinyb.BluetoothGattDescriptor;
import org.tinyb.BluetoothNotification;
import org.tinyb.BluetoothType;
public class DBTGattDescriptor extends DBTObject implements BluetoothGattDescriptor
{
/** Descriptor's characteristic weak back-reference */
final WeakReference<DBTGattCharacteristic> 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 BluetoothNotification<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 */ DBTGattDescriptor(final long nativeInstance, final DBTGattCharacteristic characteristic,
final String type_uuid, final short handle, final byte[] value)
{
super(nativeInstance, handle /* hash */);
this.wbr_characteristic = new WeakReference<DBTGattCharacteristic>(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 DBTGattDescriptor)) {
return false;
}
final DBTGattDescriptor other = (DBTGattDescriptor)obj;
return handle == other.handle; /** unique attribute handles */
}
@Override
public String getUUID() { return type_uuid; }
@Override
public BluetoothType getBluetoothType() { return class_type(); }
static BluetoothType class_type() { return BluetoothType.GATT_DESCRIPTOR; }
@Override
public final BluetoothGattDescriptor clone()
{ throw new UnsupportedOperationException(); } // FIXME
@Override
public final DBTGattCharacteristic 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 BluetoothException {
final boolean res = writeValueImpl(value);
if( res ) {
updateCachedValue(value, false);
}
return res;
}
@Override
public final synchronized void enableValueNotifications(final BluetoothNotification<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 BluetoothException;
@Override
protected native void deleteImpl(long nativeInstance);
}
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