periodimpl.java

Rapla是一个灵活的多用户资源管理系统。它提供的一些功能有：日历GUI

/*--------------------------------------------------------------------------*
 | Copyright (C) 2006 Christopher Kohlhaas                                  |
 |                                                                          |
 | This program is free software; you can redistribute it and/or modify     |
 | it under the terms of the GNU General Public License as published by the |
 | Free Software Foundation. A copy of the license has been included with   |
 | these distribution in the COPYING file, if not go to www.fsf.org         |
 |                                                                          |
 | As a special exception, you are granted the permissions to link this     |
 | program with every library, which license fulfills the Open Source       |
 | Definition as published by the Open Source Initiative (OSI).             |
 *--------------------------------------------------------------------------*/
package org.rapla.entities.domain.internal;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.NoSuchElementException;

import org.rapla.components.util.DateTools;
import org.rapla.entities.RaplaType;
import org.rapla.entities.domain.Period;
import org.rapla.entities.storage.Mementable;
import org.rapla.entities.storage.internal.SimpleEntity;

public class PeriodImpl extends SimpleEntity
    implements
        Period
        ,java.io.Serializable
        ,Mementable
{
    // Don't forget to increase the serialVersionUID when you change the fields
    private static final long serialVersionUID = 1;
    
    private final static long WEEK_MILLIS= DateTools.MILLISECONDS_PER_WEEK;

    String name;
    Date start;
    Date end;
    transient Calendar cal;

    public PeriodImpl() {

    }

    public PeriodImpl(Date start, Date end) {
        this.start = start;
        this.end = end;
    }

    final public RaplaType getRaplaType() {return TYPE;}

    public Date getStart() {
        return start;
    }

    public void setStart(Date start) {
        checkWritable();
        this.start = start;
    }

    public Date getEnd() {
        return end;
    }
    public void setEnd(Date end) {
        checkWritable();
        this.end = end;
    }

    public int getWeeks()
    {
        long diff= end.getTime()-start.getTime();
        return (int)(((diff-1)/WEEK_MILLIS )+ 1);
    }

    public String getName(Locale locale) {
        return name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        checkWritable();
        this.name = name;
    }

    public boolean contains(Date date) {
        return (date.before(end) && !date.before(start));
    }

    public int weekOf(Date date) {
        Calendar cal = Calendar.getInstance(DateTools.getTimeZone());
        if (!contains(date))
            throw new NoSuchElementException("Period doesn't contain date " + date);
        long duration = date.getTime() - start.getTime();
        long weeks = duration / (DateTools.MILLISECONDS_PER_WEEK);
        // setTimeInMillis has protected access in JDK 1.3.1
        cal.setTime(new Date(date.getTime() - weeks * DateTools.MILLISECONDS_PER_WEEK));
        int week_of_year = cal.get(Calendar.WEEK_OF_YEAR);
        cal.setTime(getStart());
        return ((int)weeks) + 1
            + (((week_of_year) != cal.get(Calendar.WEEK_OF_YEAR))? 1 :0);
    }

    public String toString() {
        return getName();
    }

    public int compareTo(Date date) {
        int result = getEnd().compareTo(date);
        if (result == 0)
            return 1;
        else
            return result;
    }

    public int compareTo(Period period) {
        int result = getStart().compareTo(period.getStart());
        if (result != 0) return result;

        if (equals(period))
            return 0;

        return (hashCode() < period.hashCode()) ? -1 : 1;
    }

    public int compareTo(Object o2) {
        if (o2 instanceof Date) {
            return compareTo((Date) o2);
        }
        if (o2 instanceof Period) {
            return compareTo((Period) o2);
        }
        throw new ClassCastException("Object needs to be an instance of Date or Period");
    }

    static private void copy(PeriodImpl source,PeriodImpl dest) {
        dest.start = source.start;
        dest.end = source.end;
        dest.name = source.name;
    }

    public void copy(Object obj) {
        super.copy((PeriodImpl)obj);
        copy((PeriodImpl) obj,this);
    }

    public Object deepClone() {
        PeriodImpl clone = new PeriodImpl();
        super.deepClone(clone);
        copy(this,clone);
        return clone;
    }

    public Object clone() {
        PeriodImpl clone = new PeriodImpl();
        super.clone(clone);
        copy(this,clone);
        return clone;
    }
}