core/java/android/midi/MidiDevice.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.
 */

package android.midi;

import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.util.Log;

import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;

/**
 * This class is used for sending and receiving data to and from an MIDI device
 * Instances of this class are created by {@link MidiManager#openDevice}.
 *
 * @hide
 */
public final class MidiDevice {
    private static final String TAG = "MidiDevice";

    private final MidiDeviceInfo mDeviceInfo;
    private final IMidiDeviceServer mServer;

   /**
     * MidiDevice should only be instantiated by MidiManager
     * @hide
     */
    public MidiDevice(MidiDeviceInfo deviceInfo, IMidiDeviceServer server) {
        mDeviceInfo = deviceInfo;
        mServer = server;
    }

    /**
     * Returns a {@link MidiDeviceInfo} object, which describes this device.
     *
     * @return the {@link MidiDeviceInfo} object
     */
    public MidiDeviceInfo getInfo() {
        return mDeviceInfo;
    }

    /**
     * Called to open a {@link MidiInputPort} for the specified port number.
     *
     * @param portNumber the number of the input port to open
     * @return the {@link MidiInputPort}
     */
    public MidiInputPort openInputPort(int portNumber) {
        try {
            ParcelFileDescriptor pfd = mServer.openInputPort(portNumber);
            if (pfd == null) {
                return null;
            }
            return new MidiInputPort(pfd, portNumber);
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in openInputPort");
            return null;
        }
    }

    /**
     * Called to open a {@link MidiOutputPort} for the specified port number.
     *
     * @param portNumber the number of the output port to open
     * @return the {@link MidiOutputPort}
     */
    public MidiOutputPort openOutputPort(int portNumber) {
        try {
            ParcelFileDescriptor pfd = mServer.openOutputPort(portNumber);
            if (pfd == null) {
                return null;
            }
            return new MidiOutputPort(pfd, portNumber);
        } catch (RemoteException e) {
            Log.e(TAG, "RemoteException in openOutputPort");
            return null;
        }
    }

    @Override
    public String toString() {
        return ("MidiDevice: " + mDeviceInfo.toString());
    }
}