Android Open Source - picasso-helper Url Connection Downloader With Setting

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 Square, Inc.//  ww  w  .  j a v a  2 s .c  om
 *
 * 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 com.squareup.picasso.Downloader} which uses {@link java.net.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 UrlConnectionDownloaderWithSetting 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;

    /**
     * File cache max age.
     */
    private int maxAge;

    /**
     * File cache max size.
     */
    private volatile long maxSize;

    public long getMaxSize() {
        return maxSize;
    }

    /**
     * Set file cache maz size.</p>
     * ex) 5 * 1024 * 1024 means 5MB
     *
     * @param maxSize file cache max size.
     */
    public void setMaxSize(long maxSize) {
        this.maxSize = maxSize;
    }

    public int getMaxAge() {
        return maxAge;
    }

    /**
     * Set file cache max age.</p>
     * ex.) 86400 means one day.
     *
     * @param maxAge file cache max age
     */
    public void setMaxAge(int maxAge) {
        this.maxAge = maxAge;
    }

    public UrlConnectionDownloaderWithSetting(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=" + maxAge);
        }

        int responseCode = connection.getResponseCode();
        if (responseCode >= 300) {
            connection.disconnect();
            throw new ResponseException(responseCode + " " + connection.getResponseMessage());
        }

        long contentLength = connection.getHeaderFieldInt("Content-Length", -1);
        boolean fromCache = parseResponseSourceHeader(connection.getHeaderField(RESPONSE_SOURCE));

        return new Response(connection.getInputStream(), fromCache, contentLength);
    }

    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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