/*
* 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.core.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 {
// TODO: Fix this with Java.time.Duration from java 8.
private static final Pattern PATTERN =
Pattern.compile("P(\\d+Y)?(\\d+M)?(\\d+D)?(T(\\d+H)?(\\d+M)?((\\d+\\.?\\d*|\\.\\d+)S)?)?");
private static final int YEAR_MG = 1;
private static final int MONTH_MG = 2;
private static final int DAY_MG = 3;
private static final int HOUR_MG = 5;
private static final int MIN_MG = 6;
private 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) {
String tDuration = duration;
if (tDuration.startsWith("-")) {
addition = false;
tDuration = tDuration.substring(1);
}
Matcher m = PATTERN.matcher(tDuration);
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: " + tDuration);
}
}
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) {
String tExp = exp;
if (tExp.startsWith("-")) {
tExp = tExp.substring(1);
}
Matcher m = PATTERN.matcher(tExp);
return m.matches();
}
}