content: /*
   * 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.media.midi;
  
  /**
   * Interface provided by a device to allow attaching
   * MidiReceivers to a MIDI device.
   */
  abstract public class MidiSender {
  
      /**
       * Connects a {@link MidiReceiver} to the sender
       *
       * @param receiver the receiver to connect
       */
      public void connect(MidiReceiver receiver) {
          if (receiver == null) {
              throw new NullPointerException("receiver null in MidiSender.connect");
          }
          onConnect(receiver);
      }
  
      /**
       * Disconnects a {@link MidiReceiver} from the sender
       *
       * @param receiver the receiver to disconnect
       */
      public void disconnect(MidiReceiver receiver) {
          if (receiver == null) {
              throw new NullPointerException("receiver null in MidiSender.disconnect");
          }
          onDisconnect(receiver);
      }
  
      /**
       * Called to connect a {@link MidiReceiver} to the sender
       *
       * @param receiver the receiver to connect
       */
      abstract public void onConnect(MidiReceiver receiver);
  
      /**
       * Called to disconnect a {@link MidiReceiver} from the sender
       *
       * @param receiver the receiver to disconnect
       */
      abstract public void onDisconnect(MidiReceiver receiver);
  }
  