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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.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;
}
}
}
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