w3c.css.media.css3.ViewMode Maven / Gradle / Ivy

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// $Id$
//
// (c) COPYRIGHT MIT, ECRIM and Keio University, 2011
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.css.media.css3;

import org.w3c.css.media.MediaFeature;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;

import java.util.ArrayList;

/**
 * @spec http://www.w3.org/TR/2012/REC-view-mode-20120619/#the--view-mode--media-feature
 */
public class ViewMode extends MediaFeature {

    static ArrayList allowed_values;
    static final String specval[] = {"windowed", "floating", "fullscreen", "maximized", "minimized"};

    static {
        allowed_values = new ArrayList();
        for (String val : specval) {
            allowed_values.add(CssIdent.getIdent(val));
        }
    }

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

    /**
     * Create a new ViewMode.
     *
     * @param expression The expression for this media feature
     * @throws org.w3c.css.util.InvalidParamException
     *          Values are incorrect
     */
    public ViewMode(ApplContext ac, String modifier,
                    CssExpression expression, boolean check)
            throws InvalidParamException {

        if (modifier != null) {
            throw new InvalidParamException("nomodifiermedia",
                    getFeatureName(), ac);
        }

        if (expression != null) {
            if (expression.getCount() > 1) {
                throw new InvalidParamException("unrecognize", ac);
            }

            CssValue val = expression.getValue();

            switch (val.getType()) {
                case CssTypes.CSS_IDENT:
                    int idx = allowed_values.indexOf((CssIdent) val);
                    if (idx != -1) {
                        value = allowed_values.get(idx);
                        break;
                    }
                    // let it flow through the exception
                default:
                    throw new InvalidParamException("value", expression.getValue(),
                            getFeatureName(), ac);
            }
        } else {
            // TODO add a warning for value less mediafeature that makes no sense
        }
    }

    public ViewMode(ApplContext ac, String modifier, CssExpression expression)
            throws InvalidParamException {
        this(ac, modifier, expression, false);
    }

    // just in case someone wants to call it externally...
    public void setModifier(ApplContext ac, String modifier)
            throws InvalidParamException {
        throw new InvalidParamException("nomodifiermedia",
                getFeatureName(), ac);
    }

    /**
     * Returns the value of this media feature.
     */

    public Object get() {
        return value;
    }

    /**
     * Returns the name of this media feature.
     */
    public final String getFeatureName() {
        return "view-mode";
    }

    /**
     * Compares two media features for equality.
     *
     * @param other The other media features.
     */
    public boolean equals(MediaFeature other) {
        try {
            ViewMode mo = (ViewMode) other;
            return (((value == null) && (mo.value == null)) || ((value != null) && value.equals(mo.value)));
        } catch (ClassCastException cce) {
            return false;
        }

    }
}