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      1 /*
      2  * Copyright (C) 2013 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.data;
     18 
     19 import android.content.Context;
     20 import android.net.Uri;
     21 import android.os.Bundle;
     22 
     23 import com.android.camera.util.PhotoSphereHelper;
     24 
     25 /**
     26  * This class breaks out the off-thread panorama support.
     27  */
     28 public class PanoramaMetadataLoader {
     29     /**
     30      * The key for the metadata in {@link com.android.camera.data.LocalData} to
     31      * indicate whether the data is a 360-degrees panorama.
     32      */
     33     private static final String KEY_PANORAMA_360 = "metadata_key_panorama_360";
     34 
     35     /**
     36      * The key for the metadata in {@link com.android.camera.data.LocalData} to
     37      * indicate whether the data is a panorama and the panorama viewer should be
     38      * used to consume it.
     39      */
     40     private static final String KEY_USE_PANORAMA_VIEWER = "metadata_key_panorama_viewer";
     41 
     42     /**
     43      * The key for the metadata in {@link com.android.camera.data.LocalData} to
     44      * indicate whether the data is a panorama with it's metadata.
     45      */
     46     private static final String KEY_IS_PANORAMA = "metadata_key_is_panorama";
     47 
     48     /**
     49      * @return whether the {@code data} is a panorama.
     50      */
     51     public static boolean isPanorama(final LocalData data) {
     52         return data.getMetadata().getBoolean(KEY_IS_PANORAMA);
     53     }
     54 
     55     /**
     56      * @return whether the {@code data} is a panorama and the panorama viewer
     57      *         should be used to consume it.
     58      */
     59     public static boolean isPanoramaAndUseViewer(final LocalData data) {
     60         return data.getMetadata().getBoolean(KEY_USE_PANORAMA_VIEWER);
     61     }
     62 
     63     /**
     64      * @return whether the {@code data} is a 360-degrees panorama.
     65      */
     66     public static boolean isPanorama360(final LocalData data) {
     67         return data.getMetadata().getBoolean(KEY_PANORAMA_360);
     68     }
     69 
     70     /**
     71      * Extracts panorama metadata from the item with the given URI and fills the
     72      * {@code metadata}.
     73      */
     74     public static void loadPanoramaMetadata(final Context context, Uri contentUri,
     75             Bundle metadata) {
     76         PhotoSphereHelper.PanoramaMetadata panoramaMetadata =
     77                 PhotoSphereHelper.getPanoramaMetadata(context, contentUri);
     78         if (panoramaMetadata == null) {
     79             return;
     80         }
     81 
     82         // Note: The use of '!=' here is in purpose as this is a singleton that
     83         // is returned if this is not a panorama, so pointer comparison works.
     84         boolean hasMetadata = panoramaMetadata != PhotoSphereHelper.NOT_PANORAMA;
     85         metadata.putBoolean(KEY_IS_PANORAMA, hasMetadata);
     86         metadata.putBoolean(KEY_PANORAMA_360, panoramaMetadata.mIsPanorama360);
     87         metadata.putBoolean(KEY_USE_PANORAMA_VIEWER,
     88                 panoramaMetadata.mUsePanoramaViewer);
     89     }
     90 }
     91