Android Open Source - watchme Image Cache

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Back to project page watchme.

License

The source code is released under:

Copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documen...

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Java Source Code

/**
*  ImageCache.java//w  w w.  j av a 2s . c om
*
*  <p>A default implementation of a ResponseCache.</p>
*
*  @author Johan Brook
*  @copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson
*  @license MIT
*/

package se.chalmers.watchme.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.CacheRequest;
import java.net.CacheResponse;
import java.net.ResponseCache;
import java.net.URI;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class ImageCache extends ResponseCache {

  private File cacheDir;
  
  /**
   * Create a new cache in a specified location.
   * 
   * @param cacheDir The directory to store the cached files
   */
  public ImageCache(File cacheDir) {
    this.cacheDir = cacheDir;
  }
      
  @Override
  public CacheResponse get(URI uri, String s, Map<String, List<String>> headers) throws IOException {
    // Fetch the file we're looking for
    final File file = new File(cacheDir, escape(uri.getPath()));
    
        if (file.exists()) {
            return new CacheResponse() {
                @Override
                public Map<String, List<String>> getHeaders() throws IOException {
                    return null;
                }

                @Override
                public InputStream getBody() throws IOException {
                  // Construct a stream from our cached file
                    return new FileInputStream(file);
                }
            };
        } else {
            return null;
        }
  }
  

    @Override
    public CacheRequest put(URI uri, URLConnection urlConnection) throws IOException {
        final File file = new File(cacheDir, escape(urlConnection.getURL().getPath()));
        
        return new CacheRequest() {
            @Override
            public OutputStream getBody() throws IOException {
                return new FileOutputStream(file);
            }

            @Override
            public void abort() {
                file.delete();
            }
        };
    }

    private String escape(String url) {
       return url.replace("/", "-").replace(".", "-");
    }

}

Java Source Code List