Android Open Source - AndroidImageCache Web Client

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License

The source code is released under:

Przemys?aw Jakubczyk Polidea Sp. z o.o. Copyright (c) 2012 All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

Java Source Code

/**
 */*w  w w  . j a v  a 2  s  . co m*/
 */
package pl.polidea.webimageview.net;

import android.content.Context;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.ExecutorService;

import pl.polidea.utils.StackPoolExecutor;
import pl.polidea.utils.TempFile;

/**
 * @author Przemys?aw Jakubczyk <przemyslaw.jakubczyk@pl.polidea.pl>
 */
public class WebClient {

  final File cacheDir;

  WebInterface webInterface = new WebInterfaceImpl();

  ExecutorService taskExecutor = new StackPoolExecutor(10, 30);

  WebClient(final Context context) {
    cacheDir = context.getCacheDir();
  }

  /**
   * Request for image. If Image under path url is downloading the current
   * time the listener is added to collection of callbacks. Otherwise new
   * download thread is run.
   * 
   * @param url
   *            the path
   * @param webCallback
   *            the client result listener
   */
  public void requestForImage(final String url, final WebCallback webCallback) {

    if (webCallback == null) {
      throw new IllegalArgumentException("webCallback cannot be null");
    }

    taskExecutor.submit(buildTask(url, webCallback));
  }

  /**
   * @param httpClient
   */
  public void setWebInterface(final WebInterface httpClient) {
    if (httpClient != null) {
      this.webInterface = httpClient;
    }
  }

  public void setTaskExecutor(final ExecutorService taskExecutor) {
    this.taskExecutor = taskExecutor;
  }

  DownloadTask buildTask(String url, WebCallback webCallback) {
    return new DownloadTask(url, webCallback);
  }

  class DownloadTask implements Runnable {

    private final String url;
    private WebCallback webCallback;

    public DownloadTask(String url, WebCallback webCallback) {
      this.url = url;
      this.webCallback = webCallback;
    }

    @Override
    public void run() {
      TempFile tempFile = TempFile.nullObject();
      try {
        tempFile = TempFile.createInDir(cacheDir);
        final InputStream stream = webInterface.execute(url);
        saveStreamToFile(stream, tempFile);
        webCallback.onWebHit(url, tempFile.asJavaFile());
      } catch (final IOException e) {
        webCallback.onWebMiss(url);
      } finally {
        tempFile.delete();
      }
    }

    public void saveStreamToFile(final InputStream is, final TempFile file)
        throws IOException {
      if (is == null) {
        throw new IOException("Empty stream");
      }
      final BufferedOutputStream os = new BufferedOutputStream(
          new FileOutputStream(file.asJavaFile()));
      final byte[] data = new byte[16384];
      int n;
      while ((n = is.read(data, 0, data.length)) != -1) {
        os.write(data, 0, n);
      }
      os.flush();
      os.close();
    }
  }

}

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