//
// $Id$
// From Sijtsche de Jong (sy.de.jong@let.rug.nl)
//
// (c) COPYRIGHT 1995-2000  World Wide Web Consortium (MIT, INRIA, Keio University)
// Please first read the full copyright statement at
// http://www.w3.org/Consortium/Legal/copyright-software-19980720

package org.w3c.css.properties3;

import java.util.Hashtable;

import org.w3c.css.values.CssLength;
import org.w3c.css.parser.CssStyle;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssExpression;
import org.w3c.css.properties.CssProperty;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.util.ApplContext;

/**
 *  <P>
 *  <EM>Value:</EM> auto || never || always || &lt;font-size&gt; || inherit<BR>
 *  <EM>Initial:</EM>auto<BR>
 *  <EM>Applies to:</EM>all elements<BR>
 *  <EM>Inherited:</EM>yes<BR>
 *  <EM>Percentages:</EM>no<BR>
 *  <EM>Media:</EM>:visual
 *  <P>
 *  This property allows author control over applying anti-aliasing fonts when rendered.
 *  <PRE>
 *  H1 { font-smooth: never}
 *  </PRE>
 */

public class CssFontSmooth extends CssProperty {

    CssValue fontsmooth;
    ApplContext ac;

    static CssIdent auto = new CssIdent("auto");
    static CssIdent never = new CssIdent("never");
    static CssIdent always = new CssIdent("always");
    static CssIdent xxsmall = new CssIdent("xx-small");
    static CssIdent xsmall = new CssIdent("x-small");
    static CssIdent small = new CssIdent("small");
    static CssIdent medium = new CssIdent("medium");
    static CssIdent large = new CssIdent("large");
    static CssIdent xlarge = new CssIdent("x-large");
    static CssIdent xxlarge = new CssIdent("xx-large");

    Hashtable fsizes = new Hashtable();

    /**
     * Create a new CssFontSmooth
     */
    public CssFontSmooth() {
	fontsmooth = auto;
    }

    /**
     * Create a new CssFontSmooth
     *
     * @param  expression The expression for this property
     * @exception InvalidParamException Values are incorrect
     */
    public CssFontSmooth(ApplContext ac, CssExpression expression) throws InvalidParamException {
	setByUser();
	fsizes.put(xxsmall, "nothing");
	fsizes.put(xsmall, "nothing");
	fsizes.put(small, "nothing");
	fsizes.put(medium, "nothing");
	fsizes.put(large, "nothing");
	fsizes.put(xlarge, "nothing");
	fsizes.put(xxlarge, "nothing");
	CssValue val = expression.getValue();

	if (fsizes.containsKey(val)) {
	    fontsmooth = val;
	    expression.next();
	}
	else if (val instanceof CssLength) { // may not be negative!
	    float f = ((Float) val.get()).floatValue();
	    if (f >= 0) {
		fontsmooth = val;
		expression.next();
		return;
	    }
	    else {
		throw new InvalidParamException("negative-value",
						val.toString(), ac);
	    }
	}
	else if (val instanceof CssIdent) {   
	    if (val.equals(auto)) {
		fontsmooth = auto;
		expression.next();
	    }
	    else if (val.equals(never)) {
		fontsmooth = never;
		expression.next();
	    }
	    else if (val.equals(always)) {
		fontsmooth = always;
		expression.next();
	    }
	    else if (val.equals(inherit)) {
		fontsmooth = inherit;
		expression.next();
	    }
	}
	else {
	    throw new InvalidParamException("value", expression.getValue(),
					    getPropertyName(), ac);
	}
    }


	/**
	 * Add this property to the CssStyle.
	 *
	 * @param style The CssStyle
	 */
	public void addToStyle(ApplContext ac, CssStyle style) {
	    if (((Css3Style) style).cssFontSmooth != null)
		style.addRedefinitionWarning(ac, this);
	    ((Css3Style) style).cssFontSmooth = this;
	}

	/**
	 * Get this property in the style.
	 *
	 * @param style The style where the property is
	 * @param resolve if true, resolve the style to find this property
	 */  
        public CssProperty getPropertyInStyle(CssStyle style, boolean resolve) {
	    if (resolve) {
		return ((Css3Style) style).getFontSmooth();
	    } else {
		return ((Css3Style) style).cssFontSmooth;
	    }
	}
    
       /**
        * Compares two properties for equality.
        *
        * @param value The other property.
        */  
       public boolean equals(CssProperty property) {
	   return (property instanceof CssFontSmooth && 
                fontsmooth.equals( ((CssFontSmooth) property).fontsmooth));
       }

	/**
	 * Returns the name of this property
	 */
	public String getPropertyName() {
	    return "font-smooth";
	}
   
	/**
	 * Returns the value of this property
	 */
	public Object get() {
	    return fontsmooth;
	}
	
	/**
	 * Returns true if this property is "softly" inherited
	 */
	public boolean isSoftlyInherited() {
	    return fontsmooth.equals(inherit);
	}
	
	/**
	 * Returns a string representation of the object
	 */
	public String toString() {
	    return fontsmooth.toString();
	}
	
	/**
	 * Is the value of this property a default value
	 * It is used by all macro for the function <code>print</code>
	 */
	public boolean isDefault() {	
	    return fontsmooth == auto;
	}

    }	

    
