/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -------------
* Timeline.java
* -------------
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Original Author: Bill Kelemen;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes
* -------
* 23-May-2003 : Version 1 (BK);
* 09-Sep-2003 : Changed some method and parameter names (DG);
* 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
*
*/
package org.jfree.chart.axis;
import java.util.Date;
/**
* An interface that defines the contract for a Timeline.
* <P>
* A Timeline will present a series of values to be used for an axis. Each
* Timeline must provide transformation methods between domain values and
* timeline values. In theory many transformations are possible. This interface
* has been implemented completely in
* {@link org.jfree.chart.axis.SegmentedTimeline}.
* <P>
* A timeline can be used as parameter to a
* {@link org.jfree.chart.axis.DateAxis} to define the values that this axis
* supports. As an example, the {@link org.jfree.chart.axis.SegmentedTimeline}
* implements a timeline formed by segments of equal length (ex. days, hours,
* minutes) where some segments can be included in the timeline and others
* excluded. Therefore timelines like "working days" or "working hours" can be
* created where non-working days or non-working hours respectively can be
* removed from the timeline, and therefore from the axis. This creates a smooth
* plot with equal separation between all included segments.
* <P>
* Because Timelines were created mainly for Date related axis, values are
* represented as longs instead of doubles. In this case, the domain value is
* just the number of milliseconds since January 1, 1970, 00:00:00 GMT as
* defined by the getTime() method of {@link java.util.Date}.
*
* @see org.jfree.chart.axis.SegmentedTimeline
* @see org.jfree.chart.axis.DateAxis
*/
public interface Timeline {
/**
* Translates a millisecond (as defined by java.util.Date) into an index
* along this timeline.
*
* @param millisecond the millisecond.
*
* @return A timeline value.
*/
long toTimelineValue(long millisecond);
/**
* Translates a date into a value on this timeline.
*
* @param date the date.
*
* @return A timeline value
*/
long toTimelineValue(Date date);
/**
* Translates a value relative to this timeline into a domain value. The
* domain value obtained by this method is not always the same domain value
* that could have been supplied to
* translateDomainValueToTimelineValue(domainValue).
* This is because the original tranformation may not be complete
* reversable.
*
* @see org.jfree.chart.axis.SegmentedTimeline
*
* @param timelineValue a timeline value.
*
* @return A domain value.
*/
long toMillisecond(long timelineValue);
/**
* Returns <code>true</code> if a value is contained in the timeline values.
*
* @param millisecond the millisecond.
*
* @return <code>true</code> if value is contained in the timeline and
* <code>false</code> otherwise.
*/
boolean containsDomainValue(long millisecond);
/**
* Returns <code>true</code> if a date is contained in the timeline values.
*
* @param date the date to verify.
*
* @return <code>true</code> if value is contained in the timeline and
* <code>false</code> otherwise.
*/
boolean containsDomainValue(Date date);
/**
* Returns <code>true</code> if a range of values are contained in the
* timeline.
*
* @param fromMillisecond the start of the range to verify.
* @param toMillisecond the end of the range to verify.
*
* @return <code>true</code> if the range is contained in the timeline or
* <code>false</code> otherwise
*/
boolean containsDomainRange(long fromMillisecond, long toMillisecond);
/**
* Returns <code>true</code> if a range of dates are contained in the
* timeline.
*
* @param fromDate the start of the range to verify.
* @param toDate the end of the range to verify.
*
* @return <code>true</code> if the range is contained in the timeline or
* <code>false</code> otherwise
*/
boolean containsDomainRange(Date fromDate, Date toDate);
}
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