com.ethercis.servicemanager.common.IsoDateJoda.java Source code

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Here is the source code for com.ethercis.servicemanager.common.IsoDateJoda.java

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/*
 * Copyright (c) 2015 Christian Chevalley
 * This file is part of Project Ethercis
 *
 * 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 com.ethercis.servicemanager.common;

import org.joda.time.DateTime;
import org.joda.time.Period;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import org.joda.time.format.ISOPeriodFormat;
import org.joda.time.format.PeriodFormatter;

/**
 * Some Joda time utitility methods, depends on lib/joda-time.jar
 * http://www.w3.org/TR/1998/NOTE-datetime-19980827
 */
public class IsoDateJoda {

    /**
     * Calculate the difference from the given time to now. 
     * ISO 8601 states: Durations are represented by the format P[n]Y[n]M[n]DT[n]H[n]M[n]S
     * @param utc Given time, e.g. "1997-07-16T19:20:30.45+01:00"
     * @return The ISO 8601 Period like "P3Y6M4DT12H30M17S"
     */
    public static String getDifferenceToNow(String utc) {
        if (utc == null)
            return "";
        utc = ReplaceVariable.replaceAll(utc, " ", "T");
        DateTime now = new DateTime();
        DateTimeFormatter f = ISODateTimeFormat.dateTimeParser();
        DateTime other = f.parseDateTime(utc);
        Period period = new Period(other, now); // Period(ReadableInstant startInstant, ReadableInstant endInstant)
        return period.toString();
    }

    /**
     * Calculate the difference of given millis.
     * @param diffMillis The elapsed time
     * @param trimDateIfPossible true:
     * <pre> 
     * 3000->00:00:03
     * 380000->00:06:20
     * 5692439078->1581:13:59.078
     * </pre>
     * false: 
     * <pre> 
    *   3000->P0000-00-00T00:00:03
    *   5692439078->P0000-00-00T1581:13:59.078
     * </pre>
     * 
     * @return The ISO 8601 Period like "P3Y6M4DT12H30M17S"
     */
    public static String getDifference(long diffMillis, boolean trimDateIfPossible) {
        if (diffMillis == 0)
            return "";
        Period period = new Period(diffMillis);
        /*
        PeriodFormatter myFormatter = new PeriodFormatterBuilder()
          .printZeroAlways()
          .appendYears()
          .appendSuffix(" year", " years")
          .appendSeparator(" and ")
          .appendMonths()
          .appendSuffix(" month", " months")
          .toFormatter();
        */

        /*if (true) */ {
            //      3000->P0000-00-00T00:00:03
            //      5692439078->P0000-00-00T1581:13:59.078
            PeriodFormatter formatter = ISOPeriodFormat.alternateExtended();
            String periodStr = formatter.print(period);
            if (trimDateIfPossible) {
                if (periodStr.startsWith("P0000-00-00T"))
                    periodStr = periodStr.substring("P0000-00-00T".length());
            }
            return periodStr;
        }
        /*
        else {
        // 3000->PT3S
        // 5692439078->PT1581H13M59.078S
        return period.toString();
        }
        */
    }

}