/*
* Copyright (c) 2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wso2.carbon.humantask.utils;
import java.math.BigDecimal;
import java.util.Calendar;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* XML Schema Duration
*/
public class Duration {
static final Pattern PATTERN =
Pattern.compile("P(\\d+Y)?(\\d+M)?(\\d+D)?(T(\\d+H)?(\\d+M)?((\\d+\\.?\\d*|\\.\\d+)S)?)?");
static final int YEAR_MG = 1;
static final int MONTH_MG = 2;
static final int DAY_MG = 3;
static final int HOUR_MG = 5;
static final int MIN_MG = 6;
static final int SEC_MG = 8;
private int _years;
private int _months;
private int _days;
private int _hours;
private int _minutes;
private BigDecimal _seconds;
private boolean addition = true;
public Duration(String duration) {
if (duration.startsWith("-")) {
addition = false;
duration = duration.substring(1);
}
Matcher m = PATTERN.matcher(duration);
if(m.matches()){
_years = parseInt(m.group(YEAR_MG));
_months = parseInt(m.group(MONTH_MG));
_days = parseInt(m.group(DAY_MG));
_hours = parseInt(m.group(HOUR_MG));
_minutes = parseInt(m.group(MIN_MG));
_seconds = m.group(SEC_MG) == null
? null : new BigDecimal(m.group(SEC_MG));
}
else{
throw new IllegalArgumentException("Invalid duration: " + duration);
}
}
public void addTo(Calendar calendar){
calendar.add( Calendar.YEAR, addition ? _years : 0 - _years);
calendar.add( Calendar.MONTH, addition ? _months : 0 - _months);
calendar.add( Calendar.DAY_OF_MONTH, addition ? _days : 0 - _days);
calendar.add( Calendar.HOUR, addition ? _hours : 0 - _hours);
calendar.add( Calendar.MINUTE, addition ? _minutes : 0 - _minutes);
calendar.add( Calendar.SECOND, (_seconds == null)
? 0 : addition ? _seconds.intValue() : 0 - _seconds.intValue());
if(_seconds!=null) {
BigDecimal fraction = _seconds.subtract(_seconds.setScale(0,BigDecimal.ROUND_DOWN));
int millisec = fraction.movePointRight(3).intValue();
calendar.add( Calendar.MILLISECOND, addition ? millisec : 0 - millisec);
}
}
private static int parseInt(String value){
if(value == null)
return 0;
else{
return Integer.parseInt(value.substring(0, value.length()-1));
}
}
public static boolean isValidExpression(String exp) {
if (exp.startsWith("-")) {
exp = exp.substring(1);
}
Matcher m = PATTERN.matcher(exp);
return m.matches();
}
}