// $Id$
// 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.properties.css;

import org.w3c.css.parser.CssStyle;
import org.w3c.css.properties.css3.Css3Style;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;

/**
 * @since CSS3
 */

public class CssOpacity extends CssProperty {


    /**
     * Create a new CssOpacity
     */
    public CssOpacity() {
    }

    /**
     * Create a new CssOpacity
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Values are incorrect
     */
    public CssOpacity(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        throw new InvalidParamException("unrecognize", ac);
    }

    public CssOpacity(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }

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

    /**
     * Compares two properties for equality.
     *
     * @param property The other property.
     */
    public boolean equals(CssProperty property) {
        return (property instanceof CssOpacity) && ((CssOpacity) property).value.equals(value);
    }

    /**
     * Returns the name of this property
     */
    public final String getPropertyName() {
        return "opacity";
    }

    /**
     * Returns the value of this property
     */
    public Object get() {
        return value;
    }

    /**
     * Returns true if this property is "softly" inherited
     */
    public boolean isSoftlyInherited() {
        return inherit == value;
    }

    /**
     * Returns a string representation of the object
     */
    public String toString() {
        return value.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 false;
    }

}