TimeMachine.java

package br.com.dextra.dextranet.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import br.com.dextra.dextranet.rest.config.Application;

import com.google.appengine.repackaged.org.joda.time.DateTime;
import com.google.appengine.repackaged.org.joda.time.DateTimeZone;
import com.google.appengine.repackaged.org.joda.time.LocalDateTime;

public class TimeMachine {

	public static final String DATA_HORA = "dd/MM/yyyy HH:mm:ss";

	public static final String DATA = "dd/MM/yyyy";

	private SimpleDateFormat formatoDataHora = new SimpleDateFormat(DATA_HORA, Application.BRASIL);

	private SimpleDateFormat formatoData = new SimpleDateFormat(DATA, Application.BRASIL);

	private final DateTimeZone zone = DateTimeZone.forID(Application.TIMEZONE_SAO_PAULO);

	public Date dataAtual() {
		DateTime dateTime = new DateTime(zone);
		return dateTime.toLocalDateTime().toDateTime().toDate();
	}

	public Date inicioDoDia(Date data) {
		DateTime dateTime = new LocalDateTime(data).toDateTime().withZone(zone);
		dateTime = dateTime.withHourOfDay(0).withMinuteOfHour(0).withSecondOfMinute(0).withMillisOfSecond(0);

		return dateTime.toLocalDateTime().toDateTime().toDate();
	}

	public Date fimDoDia(Date data) {
		DateTime dateTime = new LocalDateTime(data).toDateTime().withZone(zone);
		dateTime = dateTime.withHourOfDay(23).withMinuteOfHour(59).withSecondOfMinute(59).withMillisOfSecond(99);

		return dateTime.toLocalDateTime().toDateTime().toDate();
	}

	public String formataData(Date data) {
		return formatoDataHora.format(data);
	}

	public Date transformaEmData(String data) {
		try {
			SimpleDateFormat formatter = this.formatoData;
			if (data.length() > DATA.length()) {
				formatter = this.formatoDataHora;
			}

			return formatter.parse(data);
		} catch (ParseException e) {
			throw new RuntimeException("Erro ao realizar parse da data: " + data);
		}
	}

	public Date diasParaFrente(int dias) {
		return this.diasParaFrente(this.dataAtual(), dias);
	}

	public Date diasParaFrente(Date data, int dias) {
		DateTime dateTime = new DateTime(zone);
		Calendar diasPraFrente = dateTime.toLocalDateTime().toDateTime().toGregorianCalendar();
		diasPraFrente.setTime(data);
		diasPraFrente.add(Calendar.DAY_OF_MONTH, dias);

		return diasPraFrente.getTime();
	}

	public Date diasParaAtras(int dias) {
		return this.diasParaAtras(this.dataAtual(), dias);
	}

	public Date diasParaAtras(Date data, int dias) {
		DateTime dateTime = new DateTime(zone);
		Calendar diasParaAtras = dateTime.toLocalDateTime().toDateTime().toGregorianCalendar();
		diasParaAtras.setTime(data);
		diasParaAtras.add(Calendar.DAY_OF_MONTH, dias * -1);

		return diasParaAtras.getTime();
	}
}