FileDir.java

/*
 * The MIT License (MIT)
 * 
 * Copyright � 2013 Clover Studio Ltd. All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.cloverstudio.spikademo.lazy;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import com.cloverstudio.spikademo.couchdb.ConnectionHandler;
import com.cloverstudio.spikademo.management.UsersManagement;
import com.cloverstudio.spikademo.utils.Utils;

/**
 * FileDir
 * 
 * Used for managing files from application's file directory.
 */

public class FileDir {

	private File fileDir;

	public FileDir(Context context) {
		// Find the dir to save emoticons
		fileDir = context.getFilesDir();
		if (!fileDir.exists())
			fileDir.mkdirs();
	}

	public File getFile(String filename) {
		File file = new File(fileDir, filename);
		return file;
	}
	
	public Bitmap getBitmap(String filename) {
		Bitmap bitmap = null;
		File file = new File(fileDir, filename);
		if (file != null) {
			bitmap = decodeFile(file);
		}
		return bitmap;
	}

	public void saveFile(String filename, String url) {
		try {
			File file = new File(fileDir, filename);
			InputStream is = ConnectionHandler.httpGetRequest(url,
					UsersManagement.getLoginUser().getId());
			OutputStream os = new FileOutputStream(file);
			Utils.copyStream(is, os);
			os.close();
			is.close();
		} catch (Throwable ex) {
			ex.printStackTrace();
		}
	}

	private Bitmap decodeFile(File f) {
		try {
			// decode image size
			BitmapFactory.Options o = new BitmapFactory.Options();
			o.inJustDecodeBounds = true;
			FileInputStream stream1 = new FileInputStream(f);
			BitmapFactory.decodeStream(stream1, null, o);
			stream1.close();

			int REQUIRED_SIZE = 100;
			int width_tmp = o.outWidth, height_tmp = o.outHeight;
			int scale = 1;
			while (true) {
				if (width_tmp / 2 < REQUIRED_SIZE
						|| height_tmp / 2 < REQUIRED_SIZE)
					break;
				width_tmp /= 2;
				height_tmp /= 2;
				scale *= 2;
			}
			BitmapFactory.Options o2 = new BitmapFactory.Options();
			o2.inSampleSize = scale;
			if (Utils.isOsVersionHigherThenGingerbread()) {
                o2.inPreferredConfig = Bitmap.Config.ARGB_8888;
            } else {
                o2.inPreferredConfig = Bitmap.Config.RGB_565;
            }
			FileInputStream stream2 = new FileInputStream(f);
			Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
			stream2.close();
			return bitmap;
		} catch (FileNotFoundException e) {
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	public void clear() {
		File[] files = fileDir.listFiles();
		if (files == null)
			return;
		for (File f : files)
			f.delete();
	}

}