content: /*
   * Copyright 2018 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;
  
  import android.annotation.NonNull;
  import android.os.Binder;
  import android.os.Bundle;
  import android.os.IBinder;
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.os.RemoteException;
  import android.os.ResultReceiver;
  import android.util.Log;
  
  import java.util.Objects;
  
  /**
   * Handles incoming commands from {@link MediaController2} to {@link MediaSession2}.
   * @hide
   */
  // @SystemApi
  public final class Session2Link implements Parcelable {
      private static final String TAG = "Session2Link";
      private static final boolean DEBUG = MediaSession2.DEBUG;
  
      public static final @android.annotation.NonNull Parcelable.Creator<Session2Link> CREATOR =
              new Parcelable.Creator<Session2Link>() {
                  @Override
                  public Session2Link createFromParcel(Parcel in) {
                      return new Session2Link(in);
                  }
  
                  @Override
                  public Session2Link[] newArray(int size) {
                      return new Session2Link[size];
                  }
              };
  
      private final MediaSession2 mSession;
      private final IMediaSession2 mISession;
  
      public Session2Link(MediaSession2 session) {
          mSession = session;
          mISession = new Session2Stub();
      }
  
      Session2Link(Parcel in) {
          mSession = null;
          mISession = IMediaSession2.Stub.asInterface(in.readStrongBinder());
      }
  
      @Override
      public int describeContents() {
          return 0;
      }
  
      @Override
      public void writeToParcel(Parcel dest, int flags) {
          dest.writeStrongBinder(mISession.asBinder());
      }
  
      @Override
      public int hashCode() {
          return mISession.asBinder().hashCode();
      }
  
      @Override
      public boolean equals(Object obj) {
          if (!(obj instanceof Session2Link)) {
              return false;
          }
          Session2Link other = (Session2Link) obj;
          return Objects.equals(mISession.asBinder(), other.mISession.asBinder());
      }
  
      /** Link to death with mISession */
      public void linkToDeath(@NonNull IBinder.DeathRecipient recipient, int flags) {
          if (mISession != null) {
              try {
                  mISession.asBinder().linkToDeath(recipient, flags);
              } catch (RemoteException e) {
                  if (DEBUG) {
                      Log.d(TAG, "Session died too early.", e);
                  }
              }
          }
      }
  
      /** Unlink to death with mISession */
      public boolean unlinkToDeath(@NonNull IBinder.DeathRecipient recipient, int flags) {
          if (mISession != null) {
              return mISession.asBinder().unlinkToDeath(recipient, flags);
          }
          return true;
      }
  
      /** Interface method for IMediaSession2.connect */
      public void connect(final Controller2Link caller, int seq, Bundle connectionRequest) {
          try {
              mISession.connect(caller, seq, connectionRequest);
          } catch (RemoteException e) {
              throw new RuntimeException(e);
          }
      }
  
      /** Interface method for IMediaSession2.disconnect */
      public void disconnect(final Controller2Link caller, int seq) {
          try {
              mISession.disconnect(caller, seq);
          } catch (RemoteException e) {
              throw new RuntimeException(e);
          }
      }
  
      /** Interface method for IMediaSession2.sendSessionCommand */
      public void sendSessionCommand(final Controller2Link caller, final int seq,
              final Session2Command command, final Bundle args, ResultReceiver resultReceiver) {
          try {
              mISession.sendSessionCommand(caller, seq, command, args, resultReceiver);
          } catch (RemoteException e) {
              throw new RuntimeException(e);
          }
      }
  
      /** Interface method for IMediaSession2.sendSessionCommand */
      public void cancelSessionCommand(final Controller2Link caller, final int seq) {
          try {
              mISession.cancelSessionCommand(caller, seq);
          } catch (RemoteException e) {
              throw new RuntimeException(e);
          }
      }
  
      /** Stub implementation for IMediaSession2.connect */
      public void onConnect(final Controller2Link caller, int pid, int uid, int seq,
              Bundle connectionRequest) {
          mSession.onConnect(caller, pid, uid, seq, connectionRequest);
      }
  
      /** Stub implementation for IMediaSession2.disconnect */
      public void onDisconnect(final Controller2Link caller, int seq) {
          mSession.onDisconnect(caller, seq);
      }
  
      /** Stub implementation for IMediaSession2.sendSessionCommand */
      public void onSessionCommand(final Controller2Link caller, final int seq,
              final Session2Command command, final Bundle args, ResultReceiver resultReceiver) {
          mSession.onSessionCommand(caller, seq, command, args, resultReceiver);
      }
  
      /** Stub implementation for IMediaSession2.cancelSessionCommand */
      public void onCancelCommand(final Controller2Link caller, final int seq) {
          mSession.onCancelCommand(caller, seq);
      }
  
      private class Session2Stub extends IMediaSession2.Stub {
          @Override
          public void connect(final Controller2Link caller, int seq, Bundle connectionRequest) {
              if (caller == null || connectionRequest == null) {
                  return;
              }
              final int pid = Binder.getCallingPid();
              final int uid = Binder.getCallingUid();
              final long token = Binder.clearCallingIdentity();
              try {
                  Session2Link.this.onConnect(caller, pid, uid, seq, connectionRequest);
              } finally {
                  Binder.restoreCallingIdentity(token);
              }
          }
  
          @Override
          public void disconnect(final Controller2Link caller, int seq) {
              if (caller == null) {
                  return;
              }
              final long token = Binder.clearCallingIdentity();
              try {
                  Session2Link.this.onDisconnect(caller, seq);
              } finally {
                  Binder.restoreCallingIdentity(token);
              }
          }
  
          @Override
          public void sendSessionCommand(final Controller2Link caller, final int seq,
                  final Session2Command command, final Bundle args, ResultReceiver resultReceiver) {
              if (caller == null) {
                  return;
              }
              final long token = Binder.clearCallingIdentity();
              try {
                  Session2Link.this.onSessionCommand(caller, seq, command, args, resultReceiver);
              } finally {
                  Binder.restoreCallingIdentity(token);
              }
          }
  
          @Override
          public void cancelSessionCommand(final Controller2Link caller, final int seq) {
              if (caller == null) {
                  return;
              }
              final long token = Binder.clearCallingIdentity();
              try {
                  Session2Link.this.onCancelCommand(caller, seq);
              } finally {
                  Binder.restoreCallingIdentity(token);
              }
          }
      }
  }
  