import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

mobile/android/thirdparty/com/squareup/picasso/UrlConnectionDownloader.java

@@ -0,0 +1,100 @@
+/*
+ * 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.content.Context;
+import android.net.Uri;
+import android.net.http.HttpResponseCache;
+import android.os.Build;
+import java.io.File;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import static com.squareup.picasso.Utils.parseResponseSourceHeader;
+
+/**
+ * A {@link Downloader} which uses {@link HttpURLConnection} to download images. A disk cache of 2%
+ * of the total available space will be used (capped at 50MB) will automatically be installed in the
+ * application's cache directory, when available.
+ */
+public class UrlConnectionDownloader implements Downloader {
+  static final String RESPONSE_SOURCE = "X-Android-Response-Source";
+
+  private static final Object lock = new Object();
+  static volatile Object cache;
+
+  private final Context context;
+
+  public UrlConnectionDownloader(Context context) {
+    this.context = context.getApplicationContext();
+  }
+
+  protected HttpURLConnection openConnection(Uri path) throws IOException {
+    HttpURLConnection connection = (HttpURLConnection) new URL(path.toString()).openConnection();
+    connection.setConnectTimeout(Utils.DEFAULT_CONNECT_TIMEOUT);
+    connection.setReadTimeout(Utils.DEFAULT_READ_TIMEOUT);
+    return connection;
+  }
+
+  @Override public Response load(Uri uri, boolean localCacheOnly) throws IOException {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+      installCacheIfNeeded(context);
+    }
+
+    HttpURLConnection connection = openConnection(uri);
+    connection.setUseCaches(true);
+    if (localCacheOnly) {
+      connection.setRequestProperty("Cache-Control", "only-if-cached,max-age=" + Integer.MAX_VALUE);
+    }
+
+    int responseCode = connection.getResponseCode();
+    if (responseCode >= 300) {
+      connection.disconnect();
+      throw new ResponseException(responseCode + " " + connection.getResponseMessage());
+    }
+
+    boolean fromCache = parseResponseSourceHeader(connection.getHeaderField(RESPONSE_SOURCE));
+
+    return new Response(connection.getInputStream(), fromCache);
+  }
+
+  private static void installCacheIfNeeded(Context context) {
+    // DCL + volatile should be safe after Java 5.
+    if (cache == null) {
+      try {
+        synchronized (lock) {
+          if (cache == null) {
+            cache = ResponseCacheIcs.install(context);
+          }
+        }
+      } catch (IOException ignored) {
+      }
+    }
+  }
+
+  private static class ResponseCacheIcs {
+    static Object install(Context context) throws IOException {
+      File cacheDir = Utils.createDefaultCacheDir(context);
+      HttpResponseCache cache = HttpResponseCache.getInstalled();
+      if (cache == null) {
+        long maxSize = Utils.calculateDiskCacheSize(cacheDir);
+        cache = HttpResponseCache.install(cacheDir, maxSize);
+      }
+      return cache;
+    }
+  }
+}