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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.one;
     18 
     19 import android.content.Context;
     20 import android.util.DisplayMetrics;
     21 
     22 import com.android.camera.device.ActiveCameraDeviceTracker;
     23 import com.android.camera.one.config.OneCameraFeatureConfig;
     24 import com.android.camera.one.v1.LegacyOneCameraManagerImpl;
     25 import com.android.camera.one.v1.LegacyOneCameraOpenerImpl;
     26 import com.android.camera.one.v2.Camera2OneCameraManagerImpl;
     27 import com.android.camera.one.v2.Camera2OneCameraOpenerImpl;
     28 import com.google.common.base.Optional;
     29 
     30 /**
     31  * Factory methods and functions for selecting and creating instances of
     32  * OneCamera objects.
     33  */
     34 public final class OneCameraModule {
     35     private OneCameraModule() { }
     36 
     37     /**
     38      * Creates a new camera manager that is based on Camera2 API, if available.
     39      *
     40      * @throws OneCameraException Thrown if an error occurred while trying to
     41      *             access the camera.
     42      */
     43     public static OneCameraOpener provideOneCameraOpener(
     44             OneCameraFeatureConfig featureConfig,
     45             Context context,
     46             ActiveCameraDeviceTracker activeCameraDeviceTracker,
     47             DisplayMetrics displayMetrics) throws OneCameraException {
     48         Optional<OneCameraOpener> manager = Camera2OneCameraOpenerImpl.create(
     49               featureConfig, context, activeCameraDeviceTracker, displayMetrics);
     50         if (!manager.isPresent()) {
     51             manager = LegacyOneCameraOpenerImpl.create();
     52         }
     53         if (!manager.isPresent()) {
     54             throw new OneCameraException("No camera manager is available.");
     55         }
     56         return manager.get();
     57     }
     58 
     59     /**
     60      * Creates a new hardware manager that is based on Camera2 API, if available.
     61      *
     62      * @throws OneCameraException Thrown if an error occurred while trying to
     63      *             access the camera which may occur when accessing the legacy
     64      *             hardware manager.
     65      */
     66     public static OneCameraManager provideOneCameraManager() throws OneCameraException {
     67         Optional<Camera2OneCameraManagerImpl> camera2HwManager = Camera2OneCameraManagerImpl
     68               .create();
     69         if (camera2HwManager.isPresent()) {
     70             return camera2HwManager.get();
     71         }
     72 
     73         Optional<LegacyOneCameraManagerImpl> legacyHwManager = LegacyOneCameraManagerImpl.instance();
     74         if (legacyHwManager.isPresent()) {
     75             return legacyHwManager.get();
     76         }
     77 
     78         throw new OneCameraException("No hardware manager is available.");
     79     }
     80 }
     81