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/*
* 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 com.android.camera.one;
import com.google.common.base.Optional;
import android.os.Handler;
import android.util.DisplayMetrics;
import com.android.camera.CameraActivity;
import com.android.camera.debug.Log.Tag;
import com.android.camera.one.OneCamera.Facing;
import com.android.camera.one.OneCamera.OpenCallback;
import com.android.camera.one.v2.imagesaver.ImageSaver;
import com.android.camera.util.Size;
/**
* The camera manager is responsible for instantiating {@link OneCamera}
* instances.
*/
public abstract class OneCameraManager {
private static Tag TAG = new Tag("OneCameraManager");
/**
* Attempts to open the camera facing the given direction with the given
* capture size.
*
* Exactly one call will always be made to a single method in the provided
* {@link OpenCallback}.
*
* @param facing which camera to open. The first camera found in the given
* direction will be opened.
* @param enableHdr if an HDR feature exists, open a camera that supports it
* @param captureSize the capture size. This must be one of the supported
* sizes.
* @param imageSaverBuilder the builder that will be used to create {@link ImageSaver}.
* @param callback this listener is called when the camera was opened or
* when it failed to open.
* @param handler the handler on which callback methods are invoked.
*/
public abstract void open(Facing facing, boolean enableHdr, Size captureSize,
ImageSaver.Builder imageSaverBuilder, OpenCallback callback, Handler handler);
// TODO: Move this to OneCameraCharacteristics class.
/**
* Returns whether the device has a camera facing the given direction.
*/
public abstract boolean hasCameraFacing(Facing facing);
/**
* Retrieve the characteristics for the camera facing at the given direction. The first camera
* found in the given direction will be chosen.
*
* @param facing The facing direction of the camera.
* @return A #{link com.android.camera.one.OneCameraCharacteristics} object to provide camera
* characteristics information. Returns null if there is no camera facing the given
* direction.
*/
public abstract OneCameraCharacteristics getCameraCharacteristics(Facing facing)
throws OneCameraAccessException;
/**
* Creates a camera manager that is based on Camera2 API, if available, or
* otherwise uses the portability layer API.
*
* @throws OneCameraException Thrown if an error occurred while trying to
* access the camera.
*/
public static OneCameraManager get(CameraActivity activity, DisplayMetrics displayMetrics)
throws OneCameraException {
return create(activity, displayMetrics);
}
/**
* Creates a new camera manager that is based on Camera2 API, if available.
*
* @throws OneCameraException Thrown if an error occurred while trying to
* access the camera.
*/
private static OneCameraManager create(CameraActivity activity, DisplayMetrics displayMetrics)
throws OneCameraException {
Optional<OneCameraManager> manager =
com.android.camera.one.v2.OneCameraManagerImpl.create(activity, displayMetrics);
if (!manager.isPresent()) {
manager = com.android.camera.one.v1.OneCameraManagerImpl.create(activity);
}
if (!manager.isPresent()) {
throw new OneCameraException("No camera manager is available.");
}
return manager.get();
}
}
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