Android Open Source - AndroidImageScraper Image Checker Task

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From Project

Back to project page AndroidImageScraper.

License

The source code is released under:

Apache License

Java Source Code

package im.delight.imagescraper;
//from   ww w.ja v a  2 s .  c  o m
/**
 * Copyright 2013 www.delight.im <info@delight.im>
 *
 * 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.
 */

import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.io.IOException;

/** Single task that is run by the ImageChecker and checks a single image URL for its MIME type and file size */
public class ImageCheckerTask implements Runnable {

  private final String mURL;
    private final String mUserAgent;
    private int mFileSize;

    /**
     * Constructs a new single ImageChecker task with the given URL
     *
     * @param url image URL to check for MIME type and file size
     * @param userAgent value for the `User-Agent` HTTP header
     */
    public ImageCheckerTask(String url, String userAgent) {
        mURL = url;
        mUserAgent = userAgent;
    }

    /**
     * Returns the URL that this ImageChecker task has been working on
     *
     * @return image file URL
     */
    public String getURL() {
      return mURL;
    }

    /**
     * Returns the file size that this ImageChecker task has found for the URL that was passed to it
     *
     * @return the image file's size
     */
    public int getFileSize() {
        return mFileSize;
    }

    /** Runs the ImageChecker tasks and detects the MIME type and file size for the URL that was passed */
  @Override
  public void run() {
    HttpURLConnection urlConnection = null;
    URL url;
    try {
      url = new URL(mURL);
    }
    catch (MalformedURLException e) {
      mFileSize = 0;
      return;
    }
    try {
      urlConnection = (HttpURLConnection) url.openConnection();
      urlConnection.setReadTimeout(ImageScraper.NETWORK_READ_TIMEOUT_MILLIS);
      urlConnection.setConnectTimeout(ImageScraper.NETWORK_CONNECT_TIMEOUT_MILLIS);
      urlConnection.setUseCaches(false);
      urlConnection.setRequestProperty("User-Agent", mUserAgent);
      urlConnection.connect();
      final String mimeType = urlConnection.getContentType();
      if (mimeType == null || mimeType.contains(ImageScraper.MIME_TYPE_JPEG)) {
        mFileSize = urlConnection.getContentLength();
      }
      else {
        mFileSize = 0;
      }
      if (mFileSize < ImageScraper.MIN_FILESIZE_BYTES || mFileSize > ImageScraper.MAX_FILESIZE_BYTES) {
        mFileSize = 0;
      }
    }
    catch (IOException e) {
      mFileSize = 0;
    }
    finally {
      if (urlConnection != null) {
        urlConnection.disconnect();
      }
    }
  }

}

Java Source Code List

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