Helper.java

package com.myMinistry;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;

import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.joda.time.Period;
import org.joda.time.format.PeriodFormatter;
import org.joda.time.format.PeriodFormatterBuilder;

import android.content.Context;
import android.database.Cursor;
import android.os.Environment;
import android.text.format.DateUtils;
import android.util.TypedValue;

import com.myMinistry.provider.MinistryContract.UnionsNameAsRef;
import com.myMinistry.provider.MinistryDatabase;
import com.myMinistry.util.FileUtils;

public class Helper {
	public static Calendar roundMinutesAndHour(Calendar time, int TIME_PICKER_INTERVAL) {
		int minute = time.get(Calendar.MINUTE);
		int hour = time.get(Calendar.HOUR_OF_DAY);
		
		if (time.get(Calendar.MINUTE) % TIME_PICKER_INTERVAL != 0) {
			int minuteFloor = minute - (minute % TIME_PICKER_INTERVAL);
			minute = minuteFloor + (minute == minuteFloor + 1 ? TIME_PICKER_INTERVAL : 0);
			if (minute == 60) {
				hour++;
				minute = 0;
			}
		}
		
		time.set(Calendar.HOUR_OF_DAY, hour);
		time.set(Calendar.MINUTE, minute);
		return time;
	}
	
	public static String numberFormat(Double number) {
		DecimalFormat format = (DecimalFormat) DecimalFormat.getInstance(Locale.getDefault());
		return format.format(number);
	}
	
	public static boolean renameDB(Context context) {
		/** Create the file */
		File oldDB = context.getDatabasePath(MinistryDatabase.DATABASE_NAME_OLD);
		/** If the file exists we want to rename it to our new DB name :) */
		if(oldDB.exists())
			oldDB.renameTo(context.getDatabasePath(MinistryDatabase.DATABASE_NAME));
		
		return true;
	}
	
	public static void renameAndMoveBackups(Context context) {
		boolean deleteFile = true;
		boolean deleteDir = true;

		File filePath = FileUtils.getExternalDBFile(context, "");
		File dbPath = new File(FileUtils.getExternalDBFile(context, "").getParent(),"databases");
		File dbPathOLD = new File(Environment.getExternalStorageDirectory() + "/Android/data/" + context.getPackageName() + ".backup/databases");

		if(!filePath.exists())
			filePath.mkdirs();
		
		/** Check for old incorrect package name folder structure. */
		if(dbPathOLD.exists()) {
			if(dbPathOLD.exists() && dbPathOLD.canWrite()) {
				if(dbPathOLD.listFiles() != null) {
					for(File file : dbPathOLD.listFiles()) {
						deleteFile = true;
						try {
							FileUtils.copyFile(file, new File(filePath,file.getName()));
						} catch (IOException e) {
							deleteFile = false;
							deleteDir = false;
							e.printStackTrace();
						}
						if(deleteFile)
							file.delete();
					}
				}
				if(deleteDir) {
					dbPathOLD.delete();
					new File(dbPathOLD.getParent()).delete();
				}
			}
		}
		
		/** Check for correct package name but using "databases" folder instead of Android default "files". */
		if(dbPath.exists() && dbPath.canWrite()) {
			deleteDir = true;
			if(dbPath.listFiles() != null) {
				for(File file : dbPath.listFiles()) {
					deleteFile = true;
					try {
						FileUtils.copyFile(file, new File(filePath,file.getName()));
					} catch (IOException e) {
						deleteFile = false;
						deleteDir = false;
						e.printStackTrace();
					}
					if(deleteFile)
						file.delete();
				}
			}
			if(deleteDir)
				dbPath.delete();
		}
	}
	
	public static double getDifference(Calendar start, Calendar end) {
		Duration dur = new Duration(new DateTime(start), new DateTime(end));
		Period per = dur.toPeriod();
		return (double)per.getHours() + ((double)per.getMinutes() / 60.0);
	}
	
	public static String getMinuteDuration(Cursor cursor) {
		SimpleDateFormat saveDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.getDefault());
		Calendar start = Calendar.getInstance(Locale.getDefault());
		Calendar end = Calendar.getInstance(Locale.getDefault());
		
		Duration dur = new Duration(new DateTime(start), new DateTime(start));
		Duration durchange = new Duration(new DateTime(start), new DateTime(start));
		
		for(cursor.moveToFirst();!cursor.isAfterLast();cursor.moveToNext()) {
			try {
				start.setTime(saveDateFormat.parse(cursor.getString(cursor.getColumnIndex(UnionsNameAsRef.DATE_START))));
			} catch (Exception e) {
				start = Calendar.getInstance(Locale.getDefault());
			}
			try {
				end.setTime(saveDateFormat.parse(cursor.getString(cursor.getColumnIndex(UnionsNameAsRef.DATE_END))));
			} catch (Exception e) {
				end = Calendar.getInstance(Locale.getDefault());
			}
			
			durchange = new Duration(new DateTime(start), new DateTime(end));
			dur = dur.withDurationAdded(durchange, 1);
		}
		
		cursor.close();
		PeriodFormatter retVal = new PeriodFormatterBuilder()
									.printZeroAlways()
									.appendMinutes()
									.toFormatter();
		return retVal.print(dur.toPeriod());
	}
	
	public static int clearBackups(Context context) {
		File extDBDir = FileUtils.getExternalDBFile(context, "");
		
		FilenameFilter filter = new FilenameFilter() {
			public boolean accept(File dir, String filename) {
				File sel = new File(dir, filename);
				return !(filename.contains("auto")) && !(sel.isDirectory());
			}
		};
		
		if(extDBDir != null && extDBDir.exists()) {
    		File[] files = extDBDir.listFiles(filter);
    		if(files.length > 1) {
	    		File lastModifiedFile = files[0];
	    		for(int i = 1; i < files.length; i++) {
	    			if(lastModifiedFile.lastModified() < files[i].lastModified()) {
	    				lastModifiedFile = files[i];
	    			}
	    		}
	    		
	    		final String excludeFileName = lastModifiedFile.getName();
	    		filter = new FilenameFilter() {
	    			public boolean accept(File dir, String filename) {
	    				return !(filename.contains("auto")) && !(filename.contains(excludeFileName));
	    			}
	    		};
	    		
	    		files = extDBDir.listFiles(filter);
	    		
	    		for(int i = 0; i < files.length; i++)
	    			files[i].delete();
	    		
	    		return 1;
    		}
    		else
    			return 2;
    	}
		else
			return 0;
	}
	
	public static int dipsToPix(Context context, float dps) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dps, context.getResources().getDisplayMetrics());
    }
	
	public static int getIconResIDByLitTypeID(int litTypeID) {
		switch(litTypeID) {
			case MinistryDatabase.ID_BOOKS: return R.drawable.ic_action_book;
			case MinistryDatabase.ID_MAGAZINES: return R.drawable.ic_mag;
			case MinistryDatabase.ID_MEDIA: return R.drawable.ic_media;
			case MinistryDatabase.ID_TRACTS: return R.drawable.ic_tracts;
			case MinistryDatabase.ID_BROCHURES: return R.drawable.ic_booklets;
			default : return R.drawable.ic_action_summary;
		}
	}

    /**
     * Returns a String formatted in the default locale of the device. Looks like "Ddd, Mmm dd, H:MMTT - H:MMTT
     * @param context the {@link android.content.Context} that this is running within.
     * @param start the starting date and time of this entry.
     * @param end the ending date and time of this entry.
     */
	public static String buildTimeEntryDateAndTime(Context context, Calendar start, Calendar end) {
		return DateUtils.formatDateRange(context, start.getTimeInMillis(), end.getTimeInMillis(), DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_MONTH | DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_WEEKDAY | DateUtils.FORMAT_ABBREV_WEEKDAY | DateUtils.FORMAT_NO_YEAR);
	}
}