001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.util;
018
019import java.text.DecimalFormat;
020import java.text.DecimalFormatSymbols;
021import java.text.NumberFormat;
022import java.util.Locale;
023
024/**
025 * Time utilities.
026 */
027public final class TimeUtils {
028
029    private TimeUtils() {
030    }
031
032    /**
033     * Prints the duration in a human readable format as X days Y hours Z minutes etc.
034     *
035     * @param uptime the up-time in milliseconds
036     *
037     * @return the time used for displaying on screen or in logs
038     */
039    public static String printDuration(double uptime) {
040        // Code taken from Karaf
041        // https://svn.apache.org/repos/asf/karaf/trunk/shell/commands/src/main/java/org/apache/karaf/shell/commands/impl/InfoAction.java
042
043        NumberFormat fmtI = new DecimalFormat("###,###", new DecimalFormatSymbols(Locale.ENGLISH));
044        NumberFormat fmtD = new DecimalFormat("###,##0.000", new DecimalFormatSymbols(Locale.ENGLISH));
045
046        uptime /= 1000;
047        if (uptime < 60) {
048            return fmtD.format(uptime) + " seconds";
049        }
050        uptime /= 60;
051        if (uptime < 60) {
052            long minutes = (long) uptime;
053            String s = fmtI.format(minutes) + (minutes > 1 ? " minutes" : " minute");
054            return s;
055        }
056        uptime /= 60;
057        if (uptime < 24) {
058            long hours = (long) uptime;
059            long minutes = (long) ((uptime - hours) * 60);
060            String s = fmtI.format(hours) + (hours > 1 ? " hours" : " hour");
061            if (minutes != 0) {
062                s += " " + fmtI.format(minutes) + (minutes > 1 ? " minutes" : " minute");
063            }
064            return s;
065        }
066        uptime /= 24;
067        long days = (long) uptime;
068        long hours = (long) ((uptime - days) * 24);
069        String s = fmtI.format(days) + (days > 1 ? " days" : " day");
070        if (hours != 0) {
071            s += " " + fmtI.format(hours) + (hours > 1 ? " hours" : " hour");
072        }
073
074        return s;
075    }
076}