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Base classes for the Cognitive Foundry including generally utilities and linear algebra.
/*
* File: DefaultDuration.java
* Authors: Justin Basilico
* Company: Sandia National Laboratories
* Project: Cognitive Foundry
*
* Copyright May 11, 2009, Sandia Corporation.
* Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
* license for use of this work by or on behalf of the U.S. Government. Export
* of this program may require a license from the United States Government.
* See CopyrightHistory.txt for complete details.
*
*/
package gov.sandia.cognition.time;
import gov.sandia.cognition.util.AbstractCloneableSerializable;
import java.text.DecimalFormat;
/**
* A default implementation of the {@code Duration} interface. It is implemented
* storing milliseconds as a double value.
*
* @author Justin Basilico
* @since 3.0
*/
public class DefaultDuration
extends AbstractCloneableSerializable
implements Duration
{
/** There are {@value} milliseconds per second. */
public static final int MILLISECONDS_PER_SECOND = 1000;
/** There are {@value} seconds per minute. */
public static final int SECONDS_PER_MINUTE = 60;
/** There are {@value} minutes per hour. */
public static final int MINUTES_PER_HOUR = 60;
/** There are {@value} hours per day. */
public static final int HOURS_PER_DAY = 24;
/** There are {@value} milliseconds per minute. */
public static final int MILLISECONDS_PER_MINUTE =
SECONDS_PER_MINUTE * MILLISECONDS_PER_SECOND;
/** There are {@value} milliseconds per hour. */
public static final int MILLISECONDS_PER_HOUR =
MINUTES_PER_HOUR * MILLISECONDS_PER_MINUTE;
/** There are {@value} milliseoncds per day. */
public static final int MILLISECONDS_PER_DAY =
HOURS_PER_DAY * MILLISECONDS_PER_HOUR;
/** A zero duration. */
public static final DefaultDuration ZERO = new DefaultDuration(0.0);
/** A millisecond in duration. */
public static final DefaultDuration MILLISECOND =
new DefaultDuration(1.0);
/** A second in duration. */
public static final DefaultDuration SECOND =
new DefaultDuration(MILLISECONDS_PER_SECOND);
/** A minute in duration. */
public static final DefaultDuration MINUTE =
new DefaultDuration(MILLISECONDS_PER_MINUTE);
/** An hour in duration. */
public static final DefaultDuration HOUR =
new DefaultDuration(MILLISECONDS_PER_HOUR);
/** A day in duration. */
public static final DefaultDuration DAY =
new DefaultDuration(MILLISECONDS_PER_DAY);
/** The minimum value of a duration. */
public static final DefaultDuration MIN_VALUE =
new DefaultDuration(Long.MIN_VALUE);
/** The maximum value of a duration. */
public static final DefaultDuration MAX_VALUE =
new DefaultDuration(Long.MAX_VALUE);
/** Formatting used for the toString method that creates numbers of two
* digits. */
private static final DecimalFormat TWO_DIGIT_FORMAT =
new DecimalFormat("00");
/** Formatting used for the toString method that creates numbers of three
* digits. */
public static final DecimalFormat THREE_DIGIT_FORMAT =
new DecimalFormat("000");
/** The default duration keeps track of milliseconds. */
private double milliseconds;
/**
* Creates a new {@code DefaultDuration} representing the given number of
* milliseconds. To create instances of this class, the factory methods
* (from*) should be used instead of this constructor, to avoid confusion
* with the types of units used to construct the class.
*
* @param milliseconds
* The duration in milliseconds.
*/
protected DefaultDuration(
final double milliseconds)
{
super();
this.milliseconds = milliseconds;
}
/**
* Creates a new {@code DefaultDuration} from the given number of
* milliseconds.
*
* @param milliseconds
* The number of milliseconds.
* @return
* The duration representing that number of milliseconds, rounded down
* to the nearest millisecond.
*/
public static DefaultDuration fromMilliseconds(
final double milliseconds)
{
return new DefaultDuration(milliseconds);
}
/**
* Creates a new {@code DefaultDuration} from the given number of
* seconds.
*
* @param seconds
* The number of seconds.
* @return
* The duration representing that number of seconds, rounded down to
* the nearest millisecond.
*/
public static DefaultDuration fromSeconds(
final double seconds)
{
return new DefaultDuration(seconds * MILLISECONDS_PER_SECOND);
}
/**
* Creates a new {@code DefaultDuration} from the given number of
* minutes.
*
* @param minutes
* The number of minutes.
* @return
* The duration representing that number of minutes, rounded down to
* the nearest millisecond.
*/
public static DefaultDuration fromMinutes(
final double minutes)
{
return new DefaultDuration(minutes * MILLISECONDS_PER_MINUTE);
}
/**
* Creates a new {@code DefaultDuration} from the given number of
* hours.
*
* @param hours
* The number of hours.
* @return
* The duration representing that number of hours, rounded down to the
* nearest millisecond.
*/
public static DefaultDuration fromHours(
final double hours)
{
return new DefaultDuration(hours * MILLISECONDS_PER_HOUR);
}
/**
* Creates a new {@code DefaultDuration} from the given number of
* days.
*
* @param days
* The number of days.
* @return
* The duration representing that number of days, rounded down to the
* nearest millisecond.
*/
public static DefaultDuration fromDays(
final double days)
{
return new DefaultDuration(days * MILLISECONDS_PER_DAY);
}
@Override
public boolean equals(
final Object other)
{
return other instanceof Duration && this.equals((Duration) other);
}
public boolean equals(
final Duration other)
{
return other != null && this.milliseconds == other.getTotalMilliseconds();
}
@Override
public int hashCode()
{
final long bits = Double.doubleToLongBits(this.milliseconds);
return (int) (bits ^ (bits >>> 32));
}
public int compareTo(
final Duration other)
{
return Double.compare(this.milliseconds, other.getTotalMilliseconds());
}
public Duration negative()
{
return new DefaultDuration(-this.milliseconds);
}
public Duration absoluteValue()
{
return new DefaultDuration(Math.abs(this.milliseconds));
}
public Duration plus(
final Duration other)
{
return new DefaultDuration(this.milliseconds + other.getTotalMilliseconds());
}
public Duration minus(
final Duration other)
{
return new DefaultDuration(this.milliseconds - other.getTotalMilliseconds());
}
public Duration times(
final double scalar)
{
return new DefaultDuration(this.milliseconds * scalar);
}
public double divide(
final Duration other)
{
return this.milliseconds / other.getTotalMilliseconds();
}
public Duration divide(
final double scalar)
{
return new DefaultDuration(this.milliseconds / scalar);
}
public double getTotalMilliseconds()
{
return this.milliseconds;
}
public double getTotalSeconds()
{
return (this.milliseconds / MILLISECONDS_PER_SECOND);
}
public double getTotalMinutes()
{
return (this.milliseconds / MILLISECONDS_PER_MINUTE);
}
public double getTotalHours()
{
return (this.milliseconds / MILLISECONDS_PER_HOUR);
}
public double getTotalDays()
{
return (this.milliseconds / MILLISECONDS_PER_DAY);
}
public int getMillisecondsPart()
{
return (int) (this.milliseconds % MILLISECONDS_PER_SECOND);
}
public int getSecondsPart()
{
return (int) ((this.milliseconds / MILLISECONDS_PER_SECOND) % SECONDS_PER_MINUTE);
}
public int getMinutesPart()
{
return (int) ((this.milliseconds / MILLISECONDS_PER_MINUTE) % MINUTES_PER_HOUR);
}
public int getHoursPart()
{
return (int) ((this.milliseconds / MILLISECONDS_PER_HOUR) % HOURS_PER_DAY);
}
public long getDaysPart()
{
return (long) (this.milliseconds / MILLISECONDS_PER_DAY);
}
@Override
public String toString()
{
final StringBuilder result = new StringBuilder();
if (this.milliseconds < 0)
{
result.append("-");
}
final long daysPart = this.getDaysPart();
if (daysPart != 0)
{
result.append(Math.abs(daysPart));
result.append(".");
}
result.append(TWO_DIGIT_FORMAT.format(Math.abs(this.getHoursPart())));
result.append(":");
result.append(TWO_DIGIT_FORMAT.format(Math.abs(this.getMinutesPart())));
result.append(":");
result.append(TWO_DIGIT_FORMAT.format(Math.abs(this.getSecondsPart())));
final int millisecondsPart = this.getMillisecondsPart();
if (millisecondsPart != 0)
{
result.append(".");
result.append(THREE_DIGIT_FORMAT.format(Math.abs(millisecondsPart)));
}
return result.toString();
}
}