Android Open Source - dejalist Cache Manager

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Back to project page dejalist.

License

The source code is released under:

Apache License

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Java Source Code

package com.luboganev.dejalist.data;
/*w ww.  ja va2s  . co m*/
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import android.content.Context;

public class CacheManager {

    private static final long MAX_SIZE = 1000000L; // <1MB

    private CacheManager() {

    }

    public static File cacheData(Context context, File source) throws IOException {

        File cacheDir = context.getExternalCacheDir();
        long size = getDirSize(cacheDir);
        long newSize = source.length() + size;

        if (newSize > MAX_SIZE) {
            cleanDir(cacheDir, newSize - MAX_SIZE);
        }

        File file = new File(cacheDir, source.getName());
        if(file.getPath().equals(source.getPath())) {
          return file;
        }
        else {
          if(file.exists()) file.delete();
          file.createNewFile();
          if(ProductImageFileHelper.copy(source, file)) return file;
          else return null;
        }
    }
    
    public static File cacheData(Context context, InputStream is, String cachedFileName) throws IOException {
      File cacheDir = context.getExternalCacheDir();
      if (getDirSize(cacheDir) > MAX_SIZE) {
        cleanDir(cacheDir, MAX_SIZE);
      }
      
      File file = new File(cacheDir, cachedFileName);
    if(file.exists()) file.delete();
       file.createNewFile();
       
    if(ProductImageFileHelper.copy(is, file)) return file;
    else return null;
    }

    public static File retrieveData(Context context, String name) throws IOException {

        File cacheDir = context.getExternalCacheDir();
        File file = new File(cacheDir, name);

        if (!file.exists()) {
            // File doesn't exist
            return null;
        }

        return file;
    }

    private static void cleanDir(File dir, long bytes) {

        long bytesDeleted = 0;
        File[] files = dir.listFiles();

        for (File file : files) {
            bytesDeleted += file.length();
            file.delete();

            if (bytesDeleted >= bytes) {
                break;
            }
        }
    }

    private static long getDirSize(File dir) {

        long size = 0;
        File[] files = dir.listFiles();

        for (File file : files) {
            if (file.isFile()) {
                size += file.length();
            }
        }

        return size;
    }
}

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