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+/*
+ * Copyright (C) 2013 Square, Inc.
+ *
+ * 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.squareup.picasso;
+
+import android.graphics.Bitmap;
+import android.net.Uri;
+import java.io.IOException;
+import java.io.InputStream;
+
+/** A mechanism to load images from external resources such as a disk cache and/or the internet. */
+public interface Downloader {
+ /**
+ * Download the specified image {@code url} from the internet.
+ *
+ * @param uri Remote image URL.
+ * @param localCacheOnly If {@code true} the URL should only be loaded if available in a local
+ * disk cache.
+ * @return {@link Response} containing either a {@link Bitmap} representation of the request or an
+ * {@link InputStream} for the image data. {@code null} can be returned to indicate a problem
+ * loading the bitmap.
+ * @throws IOException if the requested URL cannot successfully be loaded.
+ */
+ Response load(Uri uri, boolean localCacheOnly) throws IOException;
+
+ /** Thrown for non-2XX responses. */
+ class ResponseException extends IOException {
+ public ResponseException(String message) {
+ super(message);
+ }
+ }
+
+ /** Response stream or bitmap and info. */
+ class Response {
+ final InputStream stream;
+ final Bitmap bitmap;
+ final boolean cached;
+
+ /**
+ * Response image and info.
+ *
+ * @param bitmap Image.
+ * @param loadedFromCache {@code true} if the source of the image is from a local disk cache.
+ */
+ public Response(Bitmap bitmap, boolean loadedFromCache) {
+ if (bitmap == null) {
+ throw new IllegalArgumentException("Bitmap may not be null.");
+ }
+ this.stream = null;
+ this.bitmap = bitmap;
+ this.cached = loadedFromCache;
+ }
+
+ /**
+ * Response stream and info.
+ *
+ * @param stream Image data stream.
+ * @param loadedFromCache {@code true} if the source of the stream is from a local disk cache.
+ */
+ public Response(InputStream stream, boolean loadedFromCache) {
+ if (stream == null) {
+ throw new IllegalArgumentException("Stream may not be null.");
+ }
+ this.stream = stream;
+ this.bitmap = null;
+ this.cached = loadedFromCache;
+ }
+
+ /**
+ * Input stream containing image data.
+ * <p>
+ * If this returns {@code null}, image data will be available via {@link #getBitmap()}.
+ */
+ public InputStream getInputStream() {
+ return stream;
+ }
+
+ /**
+ * Bitmap representing the image.
+ * <p>
+ * If this returns {@code null}, image data will be available via {@link #getInputStream()}.
+ */
+ public Bitmap getBitmap() {
+ return bitmap;
+ }
+ }
+}