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Groovy example source code file (Duration.java)

This example Groovy source code file (Duration.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

baseduration, calendar, date, datumdependentduration, datumdependentduration, duration, duration, from, timedatumdependentduration, timedatumdependentduration, timeduration, timeduration, util

The Groovy Duration.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 groovy.time;

import java.util.Calendar;
import java.util.Date;

/**
 * <p>Duration represents time periods which have values independent of the context.
 * So, whilst we can't say how long a month is without knowing the year and the name of the month,
 * we know how long a day is independent of the date.</p>
 * 
 * <p>This is not 100% true for days.
 * Days can actually be 23, 24 or 25 hours long (due to daylight saving adjustments.)</p>
 * 
 * <p>If you ask Duration to convert itself to milliseconds then it will work on the basis of 24 hours
 * in a day. If you add or subtract it from a date it will take daylight saving into account.</p>
 *
 * @author John Wilson tug@wilson.co.uk
 */
public class Duration extends BaseDuration {
    public Duration(final int days, final int hours, final int minutes, final int seconds, final int millis) {
        super(days, hours, minutes, seconds, millis);
    }
    
    public Duration plus(final Duration rhs) {
        return new Duration(this.getDays() + rhs.getDays(), this.getHours() + rhs.getHours(),
                            this.getMinutes() + rhs.getMinutes(), this.getSeconds() + rhs.getSeconds(),
                            this.getMillis() + rhs.getMillis());
    }

    public Duration plus(final TimeDuration rhs) {
        return rhs.plus(this);
    }
    
    public DatumDependentDuration plus(final DatumDependentDuration rhs) {
        return rhs.plus(this);
    }
    
    public Duration minus(final Duration rhs) {
        return new Duration(this.getDays() - rhs.getDays(), this.getHours() - rhs.getHours(),
                            this.getMinutes() - rhs.getMinutes(), this.getSeconds() - rhs.getSeconds(),
                            this.getMillis() - rhs.getMillis());
    }
    
    public TimeDuration minus(final TimeDuration rhs) {
        return new TimeDuration(this.getDays() - rhs.getDays(), this.getHours() - rhs.getHours(),
                                this.getMinutes() - rhs.getMinutes(), this.getSeconds() - rhs.getSeconds(),
                                this.getMillis() - rhs.getMillis());
    }
    
    public DatumDependentDuration minus(final DatumDependentDuration rhs) {
        return new DatumDependentDuration(-rhs.getYears(), -rhs.getMonths(),
                                          this.getDays() - rhs.getDays(), this.getHours() - rhs.getHours(),
                                          this.getMinutes() - rhs.getMinutes(), this.getSeconds() - rhs.getSeconds(),
                                          this.getMillis() - rhs.getMillis());
    }
    
    public TimeDatumDependentDuration minus(final TimeDatumDependentDuration rhs) {
        return new TimeDatumDependentDuration(-rhs.getYears(), -rhs.getMonths(),
                                              this.getDays() - rhs.getDays(), this.getHours() - rhs.getHours(),
                                              this.getMinutes() - rhs.getMinutes(), this.getSeconds() - rhs.getSeconds(),
                                              this.getMillis() - rhs.getMillis());
    }
    
    public long toMilliseconds() {
        return ((((((long)(this.getDays() * 24 ) + this.getHours()) * 60 + this.getMinutes()) * 60) + this.getSeconds()) * 1000) + this.getMillis();
    }
    
    public Date getAgo() {
    final Calendar cal = Calendar.getInstance();

        cal.add(Calendar.DAY_OF_YEAR, -this.getDays());
        cal.add(Calendar.HOUR_OF_DAY, -this.getHours());
        cal.add(Calendar.MINUTE, -this.getMinutes());
        cal.add(Calendar.SECOND, -this.getSeconds());
        cal.add(Calendar.MILLISECOND, -this.getMillis());
        
        
        //
        // SqlDate should not really care about these values but it seems to "remember" them
        // so we clear them.
        // We do the adds first incase we get carry into the day field
        //
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        
        return new java.sql.Date(cal.getTimeInMillis());
    }
     
    public From getFrom() {
        return new From() {
            public Date getNow() {
            final Calendar cal = Calendar.getInstance();

                cal.add(Calendar.DAY_OF_YEAR, Duration.this.getDays());
                
                //
                // SqlDate should not really care about these values but it seems to "remember" them
                // so we clear them.
                // We do the adds first incase we get carry into the day field
                //
                cal.set(Calendar.HOUR_OF_DAY, 0);
                cal.set(Calendar.MINUTE, 0);
                cal.set(Calendar.SECOND, 0);
                cal.set(Calendar.MILLISECOND, 0);
                
                return new java.sql.Date(cal.getTimeInMillis());
            }
        };
    }
}

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