/*

 ============================================================================
                   The Apache Software License, Version 1.1
 ============================================================================

 Copyright (C) 1999-2003 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 "Batik" 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. For more  information on the
 Apache Software Foundation, please see <http://www.apache.org/>.

*/

package org.apache.batik.css.engine.value;

import org.apache.batik.css.engine.CSSEngine;
import org.apache.batik.css.engine.CSSStylableElement;
import org.apache.batik.css.engine.StyleMap;
import org.w3c.css.sac.LexicalUnit;
import org.w3c.dom.DOMException;

/**
 * This interface is implemented by objects which manage the values associated
 * with a property.
 *
 * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
 * @version $Id: ValueManager.java,v 1.3 2003/08/08 11:38:55 vhardy Exp $
 */
public interface ValueManager {

    /**
     * Returns the name of the property handled.
     */
    String getPropertyName();
    
    /**
     * Whether the handled property is inherited or not.
     */
    boolean isInheritedProperty();

    /**
     * Returns the default value for the handled property.
     */
    Value getDefaultValue();

    /**
     * Creates a value from a lexical unit.
     * @param lu The SAC lexical unit used to create the value.
     * @param engine The calling CSSEngine.
     */
    Value createValue(LexicalUnit lu, CSSEngine engine) throws DOMException;

    /**
     * Creates and returns a new float value.
     * @param unitType    A unit code as defined above. The unit code can only 
     *                    be a float unit type
     * @param floatValue  The new float value. 
     */
    Value createFloatValue(short unitType, float floatValue)
	throws DOMException;

    /**
     * Creates and returns a new string value.
     * @param type   A string code as defined in CSSPrimitiveValue. The string
     *               code can only be a string unit type.
     * @param value  The new string value.
     * @param base   The base URL.
     */
    Value createStringValue(short type, String value, CSSEngine engine)
        throws DOMException;

    /**
     * Computes the given value.
     * @param elt The owner of the value.
     * @param pseudo The pseudo element.
     * @param engine The CSSEngine.
     * @param idx The property index in the engine.
     * @param sm The computed style map.
     * @param value The value to compute.
     */
    Value computeValue(CSSStylableElement elt,
                       String pseudo,
                       CSSEngine engine,
                       int idx,
                       StyleMap sm,
                       Value value);
                       
}
