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/*
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 *   Copyright 2011 Brian Rosenberger (Brutex Network)
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 *
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 *   Licensed under the Apache License, Version 2.0 (the "License");
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 *   you may not use this file except in compliance with the License.
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 *   You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 *   Unless required by applicable law or agreed to in writing, software
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 *   distributed under the License is distributed on an "AS IS" BASIS,
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 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 *   See the License for the specific language governing permissions and
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 *   limitations under the License.
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 */
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package net.brutex.xservices.ws.impl;
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import java.math.BigInteger;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.List;
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import java.util.TimeZone;
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import javax.jws.WebService;
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import net.brutex.xservices.types.DateFormatType;
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import net.brutex.xservices.types.DateInfoExtendedType;
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import net.brutex.xservices.types.DateInfoType;
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import net.brutex.xservices.types.DateTimeUnits;
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import net.brutex.xservices.types.TimeZoneType;
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import net.brutex.xservices.util.BrutexNamespaces;
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import net.brutex.xservices.ws.DateService;
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import net.brutex.xservices.ws.XServicesFault;
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/**
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 * @author Brian Rosenberger
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 *
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 */
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@WebService(targetNamespace = BrutexNamespaces.WS_XSERVICES, endpointInterface = "net.brutex.xservices.ws.DateService", serviceName = DateService.SERVICE_NAME)
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public class DateServiceImpl implements DateService {
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	private static String ERR_INVALIDFORMAT = "Invalid format pattern.";
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	private static String ERR_INVALIDTIMEZONE = "Invalid timezone.";
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	public DateInfoType getDate() throws XServicesFault {
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		GregorianCalendar c = new GregorianCalendar();
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		DateInfoType dateinfo = new DateInfoType(c, TimeZone.getDefault());
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		return dateinfo;
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	}
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	public DateInfoExtendedType getDateExtended() throws XServicesFault {
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		GregorianCalendar c = new GregorianCalendar();
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		DateInfoExtendedType dateinfo = new DateInfoExtendedType(c,
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				TimeZone.getDefault());
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		return dateinfo;
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	}
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	public BigInteger getTimestamp() {
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		Date d = new Date();
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		long l = d.getTime();
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		return new BigInteger(Long.toString(l));
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	}
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	public BigInteger getTimestamp2() {
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		Date d = new Date();
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		long l = d.getTime() / 1000;
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		return new BigInteger(Long.toString(l));
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	}
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	public String getInTimezone(Date date, String timezone)
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			throws XServicesFault {
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		if (!isValidTimezone(timezone))
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			throw new XServicesFault(ERR_INVALIDTIMEZONE);
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		TimeZone targetzone = TimeZone.getTimeZone(timezone);
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		String targetstring = DateFormatType.ISO8601.format(date, null, targetzone);
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		return targetstring;
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	}
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	public String formatDate(Date cal, DateFormatType format)
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			throws XServicesFault {
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		return format.format(cal, null, null);
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	}
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	public String formatDateAdvanced(Date cal, String format)
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			throws XServicesFault {
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		String result = null;
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		SimpleDateFormat f = new SimpleDateFormat(format);
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		result = f.format(cal);
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		return result;
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	}
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	public Date parseDate(String s, DateFormatType format, String timezone)
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			throws XServicesFault {
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		if (timezone == null | timezone.equals(""))
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			timezone = TimeZone.getDefault().getID();
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		if (!isValidTimezone(timezone))
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			throw new XServicesFault(ERR_INVALIDTIMEZONE);
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		try {
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			return format.parse(s, null, TimeZone.getTimeZone(timezone));
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		} catch (ParseException e) {
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			throw new XServicesFault(e);
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		}
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	}
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	public GregorianCalendar parseDateAdvanced(String s, String format,
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			String timezone) throws XServicesFault {
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		SimpleDateFormat f = null;
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		Date date = null;
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		if (timezone == null | timezone.equals(""))
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			timezone = TimeZone.getDefault().getID();
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		if (!isValidTimezone(timezone))
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			throw new XServicesFault(ERR_INVALIDTIMEZONE);
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		try {
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			f = new SimpleDateFormat(format);
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			date = f.parse(s);
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		} catch (IllegalArgumentException e) {
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			throw new XServicesFault(ERR_INVALIDFORMAT + e.getMessage());
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		} catch (ParseException e) {
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			throw new XServicesFault("Cannot parse date: " + e.getMessage());
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		}
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		GregorianCalendar cal = new GregorianCalendar();
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		cal.setTimeZone(TimeZone.getTimeZone(timezone));
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		cal.setTime(date);
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		return cal;
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	}
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	public BigInteger dateTimeDiff(Date fromCal, Date toCal)
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			throws XServicesFault {
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		long diff = toCal.getTime() - fromCal.getTime();
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		BigInteger d = new BigInteger(String.valueOf(diff), 10);
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		return d;
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	}
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	public BigInteger dateTimeDiff2(Date fromCal, Date toCal, DateTimeUnits unit)
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			throws XServicesFault {
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		BigInteger d = dateTimeDiff(fromCal, toCal);
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		switch (unit) {
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		case SECONDS:
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			d = d.divide(new BigInteger("1000"));
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			break;
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		case MINUTES:
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			d = d.divide(new BigInteger("60000"));
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			break;
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		case HOURS:
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			d = d.divide(new BigInteger("3600000"));
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			break;
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		case DAYS:
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			d = d.divide(new BigInteger("86400000"));
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			break;
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		case YEARS:
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			d = d.divide(new BigInteger("31536000000"));
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			break;
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		}
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		return d;
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	}
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	public GregorianCalendar dateAdd(GregorianCalendar cal, BigInteger value,
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			DateTimeUnits unit) throws XServicesFault {
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		switch (unit) {
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		case SECONDS:
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			cal.add(GregorianCalendar.SECOND, value.intValue());
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			break;
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		case MINUTES:
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			cal.add(GregorianCalendar.MINUTE, value.intValue());
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			break;
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		case HOURS:
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			cal.add(GregorianCalendar.HOUR_OF_DAY, value.intValue());
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			break;
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		case DAYS:
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			cal.add(GregorianCalendar.DAY_OF_MONTH, value.intValue());
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			break;
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		case YEARS:
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			cal.add(GregorianCalendar.YEAR, value.intValue());
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			break;
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		default:
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			cal.add(GregorianCalendar.MILLISECOND, value.intValue());
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		}
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		return cal;
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	}
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	private boolean isValidTimezone(String id) {
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		boolean yes = false;
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		for (String s : TimeZone.getAvailableIDs()) {
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			if (s.equals(id)) {
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				yes = true;
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				break;
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			}
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		}
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		return yes;
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	}
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	public List<TimeZoneType> getTimezones() {
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		List<TimeZoneType> output = new ArrayList<TimeZoneType>();
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		for (String s : TimeZone.getAvailableIDs()) {
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			output.add(new TimeZoneType(TimeZone.getTimeZone(s)));
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		}
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		return output;
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	}
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}