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.hardware.camera2.impl;
  
  import android.os.Binder;
  import android.hardware.camera2.CameraCaptureSession;
  import android.hardware.camera2.CameraDevice;
  import android.hardware.camera2.CaptureFailure;
  import android.hardware.camera2.CaptureRequest;
  import android.hardware.camera2.CaptureResult;
  import android.hardware.camera2.TotalCaptureResult;
  import android.view.Surface;
  
  import java.util.concurrent.Executor;
  
  import static com.android.internal.util.Preconditions.*;
  
  /**
   * Proxy out invocations to the camera2 API callbacks into a {@link Dispatchable}.
   *
   * <p>Since abstract classes do not support Java's dynamic {@code Proxy}, we have to
   * to use our own proxy mechanism.</p>
   */
  public class CallbackProxies {
      public static class SessionStateCallbackProxy
              extends CameraCaptureSession.StateCallback {
          private final Executor mExecutor;
          private final CameraCaptureSession.StateCallback mCallback;
  
          public SessionStateCallbackProxy(Executor executor,
                  CameraCaptureSession.StateCallback callback) {
              mExecutor = checkNotNull(executor, "executor must not be null");
              mCallback = checkNotNull(callback, "callback must not be null");
          }
  
          @Override
          public void onConfigured(CameraCaptureSession session) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onConfigured(session));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
  
          @Override
          public void onConfigureFailed(CameraCaptureSession session) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onConfigureFailed(session));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
          @Override
          public void onReady(CameraCaptureSession session) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onReady(session));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
          @Override
          public void onActive(CameraCaptureSession session) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onActive(session));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
          @Override
          public void onCaptureQueueEmpty(CameraCaptureSession session) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onCaptureQueueEmpty(session));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
          @Override
          public void onClosed(CameraCaptureSession session) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onClosed(session));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
          @Override
          public void onSurfacePrepared(CameraCaptureSession session, Surface surface) {
              final long ident = Binder.clearCallingIdentity();
              try {
                  mExecutor.execute(() -> mCallback.onSurfacePrepared(session, surface));
              } finally {
                  Binder.restoreCallingIdentity(ident);
              }
          }
  
      }
  
      private CallbackProxies() {
          throw new AssertionError();
      }
  }
  