/* File: DatumFormatter.java
 * Copyright (C) 2002-2003 The University of Iowa
 *
 * Created on September 24, 2003, 4:45 PM
 *      by Edward West <eew@space.physics.uiowa.edu>
 *
 * This file is part of the das2 library.
 *
 * das2 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.das2.datum.format;

import java.util.logging.Logger;
import org.das2.datum.Datum;
import org.das2.datum.DatumRange;
import org.das2.datum.DatumVector;
import org.das2.datum.LoggerManager;
import org.das2.datum.Units;

/**
 * Formats Datum objects for printing and parses strings to Datum objects.
 * @author  Edward West
 */
public abstract class DatumFormatter {

    protected static final Logger logger= LoggerManager.getLogger("datum.formatter");

    protected DatumFormatter() {}
    
    /*
     * format the Datum so that it is understood out-of-context.  For
     * example, "4.5 seconds"
     */
    public abstract String format( Datum datum );
    
    /*
     * format the Datum in the context of a given unit.  For example,
     * "4.5".  It is acceptable to return the fully-qualified Datum, which
     * is also the default class behavior.  This will give somewhat undesirable
     * results on axes.     
     */
    public String format( Datum datum, Units units ) {
        return format( datum );
    }

    /** Returns the datum formatted as a String with special formatting
     * characters.  As with format, this should be out-of-context and should
     * be tagged with the Units. 
     *
     * The default implementation just returns the result of
     * {@link #format(org.das2.datum.Datum)}
     */
    public String grannyFormat(Datum datum) {
        return format(datum);
    }
    
    
    /** formats the Datum in the context of the units. 
     */
    public String grannyFormat( Datum datum, Units units ) {
        return format( datum, units );
    }
        
    /**
     * format the set of Datums using a consistent and optimized format.
     * First introduced to support DasAxis, where tighter coupling between
     * the two is required to efficiently provide context.
     * @param datums
     * @param context visible range, context should be provided.
     * @return
     */
    public String[] axisFormat( DatumVector datums, DatumRange context ) {
        String [] result= new String[datums.getLength()];
        for ( int i=0; i<result.length; i++ ) {
            result[i]= grannyFormat( datums.get(i), context.getUnits() );
        }
        return result;        
    }
    
}