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comparison: mobile/android/thirdparty/com/squareup/picasso/Downloader.java
mobile/android/thirdparty/com/squareup/picasso/Downloader.java
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| 1 /* | |
| 2 * Copyright (C) 2013 Square, Inc. | |
| 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 package com.squareup.picasso; | |
| 17 | |
| 18 import android.graphics.Bitmap; | |
| 19 import android.net.Uri; | |
| 20 import java.io.IOException; | |
| 21 import java.io.InputStream; | |
| 22 | |
| 23 /** A mechanism to load images from external resources such as a disk cache and/or the internet. */ | |
| 24 public interface Downloader { | |
| 25 /** | |
| 26 * Download the specified image {@code url} from the internet. | |
| 27 * | |
| 28 * @param uri Remote image URL. | |
| 29 * @param localCacheOnly If {@code true} the URL should only be loaded if available in a local | |
| 30 * disk cache. | |
| 31 * @return {@link Response} containing either a {@link Bitmap} representation of the request or an | |
| 32 * {@link InputStream} for the image data. {@code null} can be returned to indicate a problem | |
| 33 * loading the bitmap. | |
| 34 * @throws IOException if the requested URL cannot successfully be loaded. | |
| 35 */ | |
| 36 Response load(Uri uri, boolean localCacheOnly) throws IOException; | |
| 37 | |
| 38 /** Thrown for non-2XX responses. */ | |
| 39 class ResponseException extends IOException { | |
| 40 public ResponseException(String message) { | |
| 41 super(message); | |
| 42 } | |
| 43 } | |
| 44 | |
| 45 /** Response stream or bitmap and info. */ | |
| 46 class Response { | |
| 47 final InputStream stream; | |
| 48 final Bitmap bitmap; | |
| 49 final boolean cached; | |
| 50 | |
| 51 /** | |
| 52 * Response image and info. | |
| 53 * | |
| 54 * @param bitmap Image. | |
| 55 * @param loadedFromCache {@code true} if the source of the image is from a local disk cache. | |
| 56 */ | |
| 57 public Response(Bitmap bitmap, boolean loadedFromCache) { | |
| 58 if (bitmap == null) { | |
| 59 throw new IllegalArgumentException("Bitmap may not be null."); | |
| 60 } | |
| 61 this.stream = null; | |
| 62 this.bitmap = bitmap; | |
| 63 this.cached = loadedFromCache; | |
| 64 } | |
| 65 | |
| 66 /** | |
| 67 * Response stream and info. | |
| 68 * | |
| 69 * @param stream Image data stream. | |
| 70 * @param loadedFromCache {@code true} if the source of the stream is from a local disk cache. | |
| 71 */ | |
| 72 public Response(InputStream stream, boolean loadedFromCache) { | |
| 73 if (stream == null) { | |
| 74 throw new IllegalArgumentException("Stream may not be null."); | |
| 75 } | |
| 76 this.stream = stream; | |
| 77 this.bitmap = null; | |
| 78 this.cached = loadedFromCache; | |
| 79 } | |
| 80 | |
| 81 /** | |
| 82 * Input stream containing image data. | |
| 83 * <p> | |
| 84 * If this returns {@code null}, image data will be available via {@link #getBitmap()}. | |
| 85 */ | |
| 86 public InputStream getInputStream() { | |
| 87 return stream; | |
| 88 } | |
| 89 | |
| 90 /** | |
| 91 * Bitmap representing the image. | |
| 92 * <p> | |
| 93 * If this returns {@code null}, image data will be available via {@link #getInputStream()}. | |
| 94 */ | |
| 95 public Bitmap getBitmap() { | |
| 96 return bitmap; | |
| 97 } | |
| 98 } | |
| 99 } |
