Java tutorial
/* * SonarQube * Copyright (C) 2009-2017 SonarSource SA * mailto:info AT sonarsource DOT com * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package org.sonar.api.utils; import java.io.Serializable; import java.util.regex.Matcher; import java.util.regex.Pattern; import javax.annotation.Nullable; import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.builder.ToStringBuilder; import org.apache.commons.lang.builder.ToStringStyle; /** * @since 4.3 */ public class Duration implements Serializable { public static final String DAY = "d"; public static final String HOUR = "h"; public static final String MINUTE = "min"; private static final short MINUTES_IN_ONE_HOUR = 60; private final long durationInMinutes; private Duration(long durationInMinutes) { this.durationInMinutes = durationInMinutes; } private Duration(int days, int hours, int minutes, int hoursInDay) { this(((long) days * hoursInDay * MINUTES_IN_ONE_HOUR) + (hours * MINUTES_IN_ONE_HOUR) + minutes); } /** * Create a Duration from a number of minutes. */ public static Duration create(long durationInMinutes) { return new Duration(durationInMinutes); } /** * Create a Duration from a text duration and the number of hours in a day. * <br> * For instance, Duration.decode("1d 1h", 8) will have a number of minutes of 540 (1*8*60 + 60). * */ public static Duration decode(String text, int hoursInDay) { int days = 0; int hours = 0; int minutes = 0; String sanitizedText = StringUtils.deleteWhitespace(text); Pattern pattern = Pattern.compile("\\s*+(?:(\\d++)\\s*+" + DAY + ")?+\\s*+(?:(\\d++)\\s*+" + HOUR + ")?+\\s*+(?:(\\d++)\\s*+" + MINUTE + ")?+\\s*+"); Matcher matcher = pattern.matcher(text); try { if (matcher.find()) { String daysDuration = matcher.group(1); if (daysDuration != null) { days = Integer.parseInt(daysDuration); sanitizedText = sanitizedText.replace(daysDuration + DAY, ""); } String hoursText = matcher.group(2); if (hoursText != null) { hours = Integer.parseInt(hoursText); sanitizedText = sanitizedText.replace(hoursText + HOUR, ""); } String minutesText = matcher.group(3); if (minutesText != null) { minutes = Integer.parseInt(minutesText); sanitizedText = sanitizedText.replace(minutesText + MINUTE, ""); } if (sanitizedText.isEmpty()) { return new Duration(days, hours, minutes, hoursInDay); } } throw invalid(text, null); } catch (NumberFormatException e) { throw invalid(text, e); } } /** * Return the duration in text, by using the given hours in day parameter to process hours. * <br> * Duration.decode("1d 1h", 8).encode(8) will return "1d 1h" * Duration.decode("2d", 8).encode(16) will return "1d" */ public String encode(int hoursInDay) { int days = ((Double) ((double) durationInMinutes / hoursInDay / MINUTES_IN_ONE_HOUR)).intValue(); Long remainingDuration = durationInMinutes - (days * hoursInDay * MINUTES_IN_ONE_HOUR); int hours = ((Double) (remainingDuration.doubleValue() / MINUTES_IN_ONE_HOUR)).intValue(); remainingDuration = remainingDuration - (hours * MINUTES_IN_ONE_HOUR); int minutes = remainingDuration.intValue(); StringBuilder stringBuilder = new StringBuilder(); if (days > 0) { stringBuilder.append(days); stringBuilder.append(DAY); } if (hours > 0) { stringBuilder.append(hours); stringBuilder.append(HOUR); } if (minutes > 0) { stringBuilder.append(minutes); stringBuilder.append(MINUTE); } return stringBuilder.length() == 0 ? ("0" + MINUTE) : stringBuilder.toString(); } /** * Return the duration in minutes. * <br> * For instance, Duration.decode(1h, 24).toMinutes() will return 60. */ public long toMinutes() { return durationInMinutes; } /** * Return true if the given duration is greater than the current one. */ public boolean isGreaterThan(Duration other) { return toMinutes() > other.toMinutes(); } /** * Add the given duration to the current one. */ public Duration add(Duration with) { return Duration.create(durationInMinutes + with.durationInMinutes); } /** * Subtract the given duration to the current one. */ public Duration subtract(Duration with) { return Duration.create(durationInMinutes - with.durationInMinutes); } /** * Multiply the duration with the given factor. */ public Duration multiply(int factor) { return Duration.create(durationInMinutes * factor); } private static IllegalArgumentException invalid(String text, @Nullable Exception e) { throw new IllegalArgumentException(String.format( "Duration '%s' is invalid, it should use the following sample format : 2d 10h 15min", text), e); } @Override public boolean equals(Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } Duration that = (Duration) o; return durationInMinutes == that.durationInMinutes; } @Override public int hashCode() { return (int) (durationInMinutes ^ (durationInMinutes >>> 32)); } @Override public String toString() { return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE); } }