/*-- $Id: LengthRange.java,v 1.3 2001/01/02 21:32:20 klease Exp $ -- 

 ============================================================================
                   The Apache Software License, Version 1.1
 ============================================================================
 
    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modifica-
 tion, are permitted provided that the following conditions are met:
 
 1. Redistributions of  source code must  retain the above copyright  notice,
    this list of conditions and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
 
 3. The end-user documentation included with the redistribution, if any, must
    include  the following  acknowledgment:  "This product includes  software
    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
    Alternately, this  acknowledgment may  appear in the software itself,  if
    and wherever such third-party acknowledgments normally appear.
 
 4. The names "Fop" and  "Apache Software Foundation"  must not be used to
    endorse  or promote  products derived  from this  software without  prior
    written permission. For written permission, please contact
    apache@apache.org.
 
 5. Products  derived from this software may not  be called "Apache", nor may
    "Apache" appear  in their name,  without prior written permission  of the
    Apache Software Foundation.
 
 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
 APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
 INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
 DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
 OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
 ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
 (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 This software  consists of voluntary contributions made  by many individuals
 on  behalf of the Apache Software  Foundation and was  originally created by
 James Tauber <jtauber@jtauber.com>. For more  information on the Apache 
 Software Foundation, please see <http://www.apache.org/>.
 
 */
package org.apache.fop.datatypes;

import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.fo.Property;

/**
 * a "progression-dimension" quantity
 * ex. block-progression-dimension, inline-progression-dimension
 * corresponds to the triplet min-height, height, max-height (or width)
 */
public class LengthRange implements CompoundDatatype {

    private Property minimum;
    private Property optimum;
    private Property maximum;
  private static final int MINSET=1;
  private static final int OPTSET=2;
  private static final int MAXSET=4;
  private int bfSet = 0; // bit field
  private boolean bChecked = false;

  // From CompoundDatatype
    public void setComponent(String sCmpnName, Property cmpnValue,
			     boolean bIsDefault) {
      if (sCmpnName.equals("minimum"))
	setMinimum(cmpnValue, bIsDefault);
      else if (sCmpnName.equals("optimum"))
	setOptimum(cmpnValue, bIsDefault);
      else if (sCmpnName.equals("maximum"))
	setMaximum(cmpnValue, bIsDefault);
    }

  // From CompoundDatatype
  public Property getComponent(String sCmpnName) {
      if (sCmpnName.equals("minimum"))
	return getMinimum();
      else if (sCmpnName.equals("optimum"))
	return getOptimum();
      else if (sCmpnName.equals("maximum"))
	return getMaximum();
      else return null; // SHOULDN'T HAPPEN
    }

    /**
     * Set minimum value to min.
     * @param min A Length value specifying the minimum value for this
     * LengthRange.
     * @param bIsDefault If true, this is set as a "default" value
     * and not a user-specified explicit value.
     */
    protected void setMinimum(Property minimum, boolean bIsDefault) {
      this.minimum = minimum;
	if (!bIsDefault) bfSet |= MINSET;
    }


    /**
     * Set maximum value to max if it is >= optimum or optimum isn't set.
     * @param max A Length value specifying the maximum value for this
     * @param bIsDefault If true, this is set as a "default" value
     * and not a user-specified explicit value.
     */
    protected void setMaximum(Property max, boolean bIsDefault) {
	maximum = max;
	if (!bIsDefault) bfSet |= MAXSET;
    }


    /**
     * Set the optimum value.
     * @param opt A Length value specifying the optimum value for this
     * @param bIsDefault If true, this is set as a "default" value
     * and not a user-specified explicit value.
     */
    protected void setOptimum(Property opt, boolean bIsDefault) {
      optimum = opt;
      if (!bIsDefault) bfSet |= OPTSET;
    }

  // Minimum is prioritaire, if explicit
  private void checkConsistency() {
    if (bChecked) return;
    // Make sure max >= min
    // Must also control if have any allowed enum values!
    /*********************
    if (minimum.mvalue() > maximum.mvalue()) {
      if ((bfSet&MINSET)!=0) {
	// if minimum is explicit, force max to min
	if ((bfSet&MAXSET)!=0) {
	  // Warning: min>max, resetting max to min
	  MessageHandler.errorln("WARNING: forcing max to min in LengthRange");
	}
	maximum = minimum ;
      }
      else {
	minimum = maximum; // minimum was default value
      }
    }
    // Now make sure opt <= max and opt >= min
    if (optimum.mvalue() > maximum.mvalue()) {
      if ((bfSet&OPTSET)!=0) {
	if ((bfSet&MAXSET)!=0) {
	  // Warning: opt > max, resetting opt to max
	  MessageHandler.errorln("WARNING: forcing opt to max in LengthRange");
	  optimum = maximum ;
	}
	else {
	  maximum = optimum; // maximum was default value
	}
      }
      else {
	// opt is default and max is explicit or default
	optimum = maximum ;
      }
    }
    else if (optimum.mvalue() < minimum.mvalue()) {
      if ((bfSet&MINSET)!=0) {
	// if minimum is explicit, force opt to min
	if ((bfSet&OPTSET)!=0) {
	  MessageHandler.errorln("WARNING: forcing opt to min in LengthRange");
	}
	optimum = minimum ;
      }
      else {
	minimum = optimum; // minimum was default value
      }
    }
    ********$*********/
    bChecked = true;
  }

    public Property getMinimum() {
      checkConsistency();
      return this.minimum;
    }

    public Property getMaximum() {
      checkConsistency();
      return this.maximum;
    }

    public Property getOptimum() {
      checkConsistency();
      return this.optimum;
    }
}
