org.sputnikdev.bluetooth.manager.impl.CharacteristicGovernorImpl Maven / Gradle / Ivy

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A library/framework for managing bluetooth adapters, bluetooth devices, GATT services and characteristics
There is a newer version: 1.5.3
package org.sputnikdev.bluetooth.manager.impl;

/*-
 * #%L
 * org.sputnikdev:bluetooth-manager
 * %%
 * Copyright (C) 2017 Sputnik Dev
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sputnikdev.bluetooth.URL;
import org.sputnikdev.bluetooth.manager.*;
import org.sputnikdev.bluetooth.manager.transport.Characteristic;
import org.sputnikdev.bluetooth.manager.transport.CharacteristicAccessType;
import org.sputnikdev.bluetooth.manager.transport.Notification;

import java.util.Set;

/**
 *
 * @author Vlad Kolotov
 */
class CharacteristicGovernorImpl extends BluetoothObjectGovernor implements CharacteristicGovernor {

    private Logger logger = LoggerFactory.getLogger(CharacteristicGovernorImpl.class);

    private ValueListener valueListener;
    private ValueNotification valueNotification;

    CharacteristicGovernorImpl(BluetoothManagerImpl bluetoothManager, URL url) {
        super(bluetoothManager, url);
    }

    @Override
    void init(Characteristic characteristic) {
        enableNotification(characteristic);
    }

    @Override
    void update(Characteristic characteristic) { }

    @Override
    void reset(Characteristic characteristic) {
        logger.info("Disable characteristic notifications: " + getURL());
        if (characteristic.isNotifying()) {
            characteristic.disableValueNotifications();
        }
        valueNotification = null;
    }

    @Override
    public void addValueListener(ValueListener valueListener) {
        this.valueListener = valueListener;
    }

    @Override
    public void removeValueListener(ValueListener valueListener) {
        this.valueListener = null;
    }

    @Override
    public Set getFlags() throws NotReadyException {
        return getBluetoothObject().getFlags();
    }

    @Override
    public boolean isNotifiable() throws NotReadyException {
        Set flgs = getFlags();
        return flgs.contains(CharacteristicAccessType.NOTIFY) || flgs.contains(CharacteristicAccessType.INDICATE);
    }

    @Override
    public boolean isNotifying() throws NotReadyException {
        return getBluetoothObject().isNotifying();
    }

    @Override
    public boolean isWritable() throws NotReadyException {
        Set flgs = getFlags();
        return flgs.contains(CharacteristicAccessType.WRITE) ||
                flgs.contains(CharacteristicAccessType.WRITE_WITHOUT_RESPONSE);
    }

    @Override
    public boolean isReadable() throws NotReadyException {
        return getFlags().contains(CharacteristicAccessType.READ);
    }

    @Override
    public byte[] read() throws NotReadyException {
        Characteristic characteristic = getBluetoothObject();
        if (characteristic == null) {
            throw new IllegalStateException("Characteristic governor is not initialized");
        }
        byte[] result = characteristic.readValue();
        updateLastChanged();
        return result;
    }

    @Override
    public boolean write(byte[] data) throws NotReadyException {
        Characteristic characteristic = getBluetoothObject();
        if (characteristic == null) {
            throw new IllegalStateException("Characteristic governor is not initialized");
        }
        boolean result = characteristic.writeValue(data);
        updateLastChanged();
        return result;
    }

    @Override
    public String toString() {
        return "[Characteristic] " + getURL();
    }

    @Override
    public BluetoothObjectType getType() {
        return BluetoothObjectType.CHARACTERISTIC;
    }

    @Override
    public void accept(BluetoothObjectVisitor visitor) throws Exception {
        visitor.visit(this);
    }

    private void enableNotification(Characteristic characteristic) {
        if (this.valueNotification == null && canNotify(characteristic) && !characteristic.isNotifying()) {
            logger.info("Enable characteristic notifications: " + getURL());
            this.valueNotification = new ValueNotification();
            characteristic.enableValueNotifications(valueNotification);
        }
    }

    private boolean canNotify(Characteristic characteristic) {
        Set flgs = characteristic.getFlags();
        return flgs.contains(CharacteristicAccessType.NOTIFY) || flgs.contains(CharacteristicAccessType.INDICATE);
    }

    private class ValueNotification implements Notification {
        @Override
        public void notify(byte[] data) {
            try {
                ValueListener listener = valueListener;
                if (listener != null) {
                    listener.changed(data);
                }
            } catch (Exception ex) {
                logger.error("Execution error of a characteristic listener", ex);
            }
        }
    }

}