/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.dom.svg;

import java.awt.geom.AffineTransform;
import java.util.List;

import org.apache.batik.dom.AbstractDocument;
import org.apache.batik.dom.util.XLinkSupport;
import org.apache.batik.dom.util.XMLSupport;
import org.apache.batik.dom.util.ListNodeList;
import org.apache.batik.util.DoublyIndexedTable;
import org.apache.batik.util.SVGTypes;

import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.css.CSSStyleDeclaration;
import org.w3c.dom.css.DocumentCSS;
import org.w3c.dom.css.ViewCSS;
import org.w3c.dom.events.DocumentEvent;
import org.w3c.dom.events.Event;
import org.w3c.dom.stylesheets.DocumentStyle;
import org.w3c.dom.stylesheets.StyleSheetList;
import org.w3c.dom.svg.SVGAngle;
import org.w3c.dom.svg.SVGAnimatedBoolean;
import org.w3c.dom.svg.SVGAnimatedLength;
import org.w3c.dom.svg.SVGAnimatedPreserveAspectRatio;
import org.w3c.dom.svg.SVGAnimatedRect;
import org.w3c.dom.svg.SVGElement;
import org.w3c.dom.svg.SVGException;
import org.w3c.dom.svg.SVGLength;
import org.w3c.dom.svg.SVGMatrix;
import org.w3c.dom.svg.SVGNumber;
import org.w3c.dom.svg.SVGPoint;
import org.w3c.dom.svg.SVGRect;
import org.w3c.dom.svg.SVGSVGElement;
import org.w3c.dom.svg.SVGStringList;
import org.w3c.dom.svg.SVGTransform;
import org.w3c.dom.svg.SVGViewSpec;
import org.w3c.dom.views.AbstractView;
import org.w3c.dom.views.DocumentView;

/**
 * This class implements {@link org.w3c.dom.svg.SVGSVGElement}.
 *
 * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
 * @version $Id$
 */
public class SVGOMSVGElement
    extends    SVGStylableElement
    implements SVGSVGElement {

    /**
     * Table mapping XML attribute names to TraitInformation objects.
     */
    protected static DoublyIndexedTable xmlTraitInformation;
    static {
        DoublyIndexedTable t =
            new DoublyIndexedTable(SVGStylableElement.xmlTraitInformation);
        t.put(null, SVG_X_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_LENGTH, PERCENTAGE_VIEWPORT_WIDTH));
        t.put(null, SVG_Y_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_LENGTH, PERCENTAGE_VIEWPORT_HEIGHT));
        t.put(null, SVG_WIDTH_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_LENGTH, PERCENTAGE_VIEWPORT_WIDTH));
        t.put(null, SVG_HEIGHT_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_LENGTH, PERCENTAGE_VIEWPORT_HEIGHT));
//         t.put(null, SVG_BASE_PROFILE_ATTRIBUTE,
//                 new TraitInformation(false, SVGTypes.TYPE_CDATA));
//         t.put(null, SVG_CONTENT_SCRIPT_TYPE_ATTRIBUTE,
//                 new TraitInformation(false, SVGTypes.TYPE_CDATA));
//         t.put(null, SVG_CONTENT_STYLE_TYPE_ATTRIBUTE,
//                 new TraitInformation(false, SVGTypes.TYPE_CDATA));
//         t.put(null, SVG_VERSION_ATTRIBUTE,
//                 new TraitInformation(false, SVGTypes.TYPE_CDATA));
        t.put(null, SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_PRESERVE_ASPECT_RATIO_VALUE));
        t.put(null, SVG_VIEW_BOX_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_RECT));
        t.put(null, SVG_EXTERNAL_RESOURCES_REQUIRED_ATTRIBUTE,
                new TraitInformation(true, SVGTypes.TYPE_BOOLEAN));
        xmlTraitInformation = t;
    }

    /**
     * The attribute initializer.
     */
    protected static final AttributeInitializer attributeInitializer;
    static {
        attributeInitializer = new AttributeInitializer(7);
        attributeInitializer.addAttribute(XMLSupport.XMLNS_NAMESPACE_URI,
                                          null,
                                          "xmlns",
                                          SVG_NAMESPACE_URI);
        attributeInitializer.addAttribute(XMLSupport.XMLNS_NAMESPACE_URI,
                                          "xmlns",
                                          "xlink",
                                          XLinkSupport.XLINK_NAMESPACE_URI);
        attributeInitializer.addAttribute(null,
                                          null,
                                          SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE,
                                          "xMidYMid meet");
        attributeInitializer.addAttribute(null,
                                          null,
                                          SVG_ZOOM_AND_PAN_ATTRIBUTE,
                                          SVG_MAGNIFY_VALUE);
        attributeInitializer.addAttribute(null,
                                          null,
                                          SVG_VERSION_ATTRIBUTE,
                                          SVG_VERSION);
        attributeInitializer.addAttribute(null,
                                          null,
                                          SVG_CONTENT_SCRIPT_TYPE_ATTRIBUTE,
                                          "text/ecmascript");
        attributeInitializer.addAttribute(null,
                                          null,
                                          SVG_CONTENT_STYLE_TYPE_ATTRIBUTE,
                                          "text/css");
    }

    /**
     * The 'x' attribute value.
     */
    protected SVGOMAnimatedLength x;

    /**
     * The 'y' attribute value.
     */
    protected SVGOMAnimatedLength y;

    /**
     * The 'width' attribute value.
     */
    protected SVGOMAnimatedLength width;

    /**
     * The 'height' attribute value.
     */
    protected SVGOMAnimatedLength height;

    /**
     * The 'externalResourcesRequired' attribute value.
     */
    protected SVGOMAnimatedBoolean externalResourcesRequired;

    /**
     * The 'preserveAspectRatio' attribute value.
     */
    protected SVGOMAnimatedPreserveAspectRatio preserveAspectRatio;

    /**
     * The 'viewBox' attribute value.
     */
    protected SVGOMAnimatedRect viewBox;

    /**
     * Creates a new SVGOMSVGElement object.
     */
    protected SVGOMSVGElement() {
    }

    /**
     * Creates a new SVGOMSVGElement object.
     * @param prefix The namespace prefix.
     * @param owner The owner document.
     */
    public SVGOMSVGElement(String prefix, AbstractDocument owner) {
        super(prefix, owner);
        initializeLiveAttributes();
    }

    /**
     * Initializes all live attributes for this element.
     */
    protected void initializeAllLiveAttributes() {
        super.initializeAllLiveAttributes();
        initializeLiveAttributes();
    }

    /**
     * Initializes the live attribute values of this element.
     */
    private void initializeLiveAttributes() {
        x = createLiveAnimatedLength
            (null, SVG_X_ATTRIBUTE, SVG_SVG_X_DEFAULT_VALUE,
             SVGOMAnimatedLength.HORIZONTAL_LENGTH, false);
        y = createLiveAnimatedLength
            (null, SVG_Y_ATTRIBUTE, SVG_SVG_Y_DEFAULT_VALUE,
             SVGOMAnimatedLength.VERTICAL_LENGTH, false);
        width =
            createLiveAnimatedLength
                (null, SVG_WIDTH_ATTRIBUTE, SVG_SVG_WIDTH_DEFAULT_VALUE,
                 SVGOMAnimatedLength.HORIZONTAL_LENGTH, true);
        height =
            createLiveAnimatedLength
                (null, SVG_HEIGHT_ATTRIBUTE, SVG_SVG_HEIGHT_DEFAULT_VALUE,
                 SVGOMAnimatedLength.VERTICAL_LENGTH, true);
        externalResourcesRequired =
            createLiveAnimatedBoolean
                (null, SVG_EXTERNAL_RESOURCES_REQUIRED_ATTRIBUTE, false);
        preserveAspectRatio = createLiveAnimatedPreserveAspectRatio();
        viewBox = createLiveAnimatedRect(null, SVG_VIEW_BOX_ATTRIBUTE, null);
    }

    /**
     * <b>DOM</b>: Implements {@link Node#getLocalName()}.
     */
    public String getLocalName() {
        return SVG_SVG_TAG;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getX()}.
     */
    public SVGAnimatedLength getX() {
        return x;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getY()}.
     */
    public SVGAnimatedLength getY() {
        return y;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getWidth()}.
     */
    public SVGAnimatedLength getWidth() {
        return width;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getHeight()}.
     */
    public SVGAnimatedLength getHeight() {
        return height;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getContentScriptType()}.
     */
    public String getContentScriptType() {
        return getAttributeNS(null, SVG_CONTENT_SCRIPT_TYPE_ATTRIBUTE);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#setContentScriptType(String)}.
     */
    public void setContentScriptType(String type) {
        setAttributeNS(null, SVG_CONTENT_SCRIPT_TYPE_ATTRIBUTE, type);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getContentStyleType()}.
     */
    public String getContentStyleType() {
        return getAttributeNS(null, SVG_CONTENT_STYLE_TYPE_ATTRIBUTE);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#setContentStyleType(String)}.
     */
    public void setContentStyleType(String type) {
        setAttributeNS(null, SVG_CONTENT_STYLE_TYPE_ATTRIBUTE, type);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getViewport()}.
     */
    public SVGRect getViewport() {
        SVGContext ctx = getSVGContext();
        return new SVGOMRect(0, 0, ctx.getViewportWidth(),
                             ctx.getViewportHeight());
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getPixelUnitToMillimeterX()}.
     */
    public float getPixelUnitToMillimeterX() {
        return getSVGContext().getPixelUnitToMillimeter();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getPixelUnitToMillimeterY()}.
     */
    public float getPixelUnitToMillimeterY() {
        return getSVGContext().getPixelUnitToMillimeter();
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#getScreenPixelToMillimeterX()}.
     */
    public float getScreenPixelToMillimeterX() {
        return getSVGContext().getPixelUnitToMillimeter();
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#getScreenPixelToMillimeterY()}.
     */
    public float getScreenPixelToMillimeterY() {
        return getSVGContext().getPixelUnitToMillimeter();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getUseCurrentView()}.
     */
    public boolean getUseCurrentView() {
        throw new UnsupportedOperationException
            ("SVGSVGElement.getUseCurrentView is not implemented"); // XXX
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#setUseCurrentView(boolean)}.
     */
    public void setUseCurrentView(boolean useCurrentView) throws DOMException {
        throw new UnsupportedOperationException
            ("SVGSVGElement.setUseCurrentView is not implemented"); // XXX
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getCurrentView()}.
     */
    public SVGViewSpec getCurrentView() {
        throw new UnsupportedOperationException
            ("SVGSVGElement.getCurrentView is not implemented"); // XXX
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getCurrentView()}.
     */
    public float getCurrentScale() {
        AffineTransform scrnTrans = getSVGContext().getScreenTransform();
        if (scrnTrans != null) {
            return (float)Math.sqrt(scrnTrans.getDeterminant());
        }
        return 1;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#setCurrentScale(float)}.
     */
    public void setCurrentScale(float currentScale) throws DOMException {
        SVGContext context = getSVGContext();
        AffineTransform scrnTrans = context.getScreenTransform();
        float scale = 1;
        if (scrnTrans != null) {
            scale = (float)Math.sqrt(scrnTrans.getDeterminant());
        }
        float delta = currentScale/scale;
        // The way currentScale, currentTranslate are defined
        // changing scale has no effect on translate.
        scrnTrans = new AffineTransform
            (scrnTrans.getScaleX()*delta, scrnTrans.getShearY()*delta,
             scrnTrans.getShearX()*delta, scrnTrans.getScaleY()*delta,
             scrnTrans.getTranslateX(), scrnTrans.getTranslateY());
        context.setScreenTransform(scrnTrans);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getCurrentTranslate()}.
     */
    public SVGPoint getCurrentTranslate() {
        return new SVGPoint() {
            protected AffineTransform getScreenTransform() {
                SVGContext context = getSVGContext();
                return context.getScreenTransform();
            }
            public float getX() {
                AffineTransform scrnTrans = getScreenTransform();
                return (float)scrnTrans.getTranslateX();
            }
            public float getY() {
                AffineTransform scrnTrans = getScreenTransform();
                return (float)scrnTrans.getTranslateY();
            }
            public void setX(float newX) {
                SVGContext context = getSVGContext();
                AffineTransform scrnTrans = context.getScreenTransform();
                scrnTrans = new AffineTransform
                    (scrnTrans.getScaleX(), scrnTrans.getShearY(),
                     scrnTrans.getShearX(), scrnTrans.getScaleY(),
                     newX, scrnTrans.getTranslateY());
                context.setScreenTransform(scrnTrans);
            }
            public void setY(float newY) {
                SVGContext context = getSVGContext();
                AffineTransform scrnTrans = context.getScreenTransform();
                scrnTrans = new AffineTransform
                    (scrnTrans.getScaleX(), scrnTrans.getShearY(),
                     scrnTrans.getShearX(), scrnTrans.getScaleY(),
                     scrnTrans.getTranslateX(), newY);
                context.setScreenTransform(scrnTrans);
            }
            public SVGPoint matrixTransform(SVGMatrix mat) {
                AffineTransform scrnTrans = getScreenTransform();
                float x = (float)scrnTrans.getTranslateX();
                float y = (float)scrnTrans.getTranslateY();
                float newX = mat.getA() * x + mat.getC() * y + mat.getE();
                float newY = mat.getB() * x + mat.getD() * y + mat.getF();
                return new SVGOMPoint(newX, newY);
            }
        };
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#suspendRedraw(int)}.
     */
    public int suspendRedraw(int max_wait_milliseconds) {
        if (max_wait_milliseconds > 60000) {
            max_wait_milliseconds = 60000;
        } else if (max_wait_milliseconds < 0) {
            max_wait_milliseconds = 0;
        }
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        return ctx.suspendRedraw(max_wait_milliseconds);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#unsuspendRedraw(int)}.
     */
    public void unsuspendRedraw(int suspend_handle_id) throws DOMException {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        if (!ctx.unsuspendRedraw(suspend_handle_id)) {
            throw createDOMException
                (DOMException.NOT_FOUND_ERR, "invalid.suspend.handle",
                 new Object[] { new Integer(suspend_handle_id) });
        }
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#unsuspendRedrawAll()}.
     */
    public void unsuspendRedrawAll() {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        ctx.unsuspendRedrawAll();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#forceRedraw()}.
     */
    public void forceRedraw() {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        ctx.forceRedraw();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#pauseAnimations()}.
     */
    public void pauseAnimations() {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        ctx.pauseAnimations();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#unpauseAnimations()}.
     */
    public void unpauseAnimations() {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        ctx.unpauseAnimations();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#animationsPaused()}.
     */
    public boolean animationsPaused() {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        return ctx.animationsPaused();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getCurrentTime()}.
     */
    public float getCurrentTime() {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        return ctx.getCurrentTime();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#setCurrentTime(float)}.
     */
    public void setCurrentTime(float seconds) {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        ctx.setCurrentTime(seconds);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#getIntersectionList(SVGRect,SVGElement)}.
     */
    public NodeList getIntersectionList(SVGRect rect,
                                        SVGElement referenceElement) {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        List list = ctx.getIntersectionList(rect, referenceElement);
        return new ListNodeList(list);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#getEnclosureList(SVGRect,SVGElement)}.
     */
    public NodeList getEnclosureList(SVGRect rect,
                                     SVGElement referenceElement) {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        List list = ctx.getEnclosureList(rect, referenceElement);
        return new ListNodeList(list);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#checkIntersection(SVGElement,SVGRect)}.
     */
    public boolean checkIntersection(SVGElement element, SVGRect rect) {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        return ctx.checkIntersection(element, rect);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#checkEnclosure(SVGElement,SVGRect)}.
     */
    public boolean checkEnclosure(SVGElement element, SVGRect rect) {
        SVGSVGContext ctx = (SVGSVGContext)getSVGContext();
        return ctx.checkEnclosure(element, rect);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#deselectAll()}.
     */
    public void deselectAll() {
        ((SVGSVGContext)getSVGContext()).deselectAll();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGNumber()}.
     */
    public SVGNumber createSVGNumber() {
        return new SVGNumber() {
            protected float value;
            public float getValue() {
                return value;
            }
            public void setValue(float f) {
                value = f;
            }
        };
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGLength()}.
     */
    public SVGLength createSVGLength() {
        return new SVGOMLength(this);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGAngle()}.
     */
    public SVGAngle createSVGAngle() {
        return new SVGOMAngle();
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGPoint()}.
     */
    public SVGPoint createSVGPoint() {
        return new SVGOMPoint(0, 0);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGMatrix()}.
     */
    public SVGMatrix createSVGMatrix() {
        return new AbstractSVGMatrix() {
            protected AffineTransform at = new AffineTransform();
            protected AffineTransform getAffineTransform() {
                return at;
            }
        };
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGRect()}.
     */
    public SVGRect createSVGRect() {
        return new SVGOMRect(0, 0, 0, 0);
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#createSVGTransform()}.
     */
    public SVGTransform createSVGTransform() {
        SVGOMTransform ret = new SVGOMTransform();
        ret.setType(SVGTransform.SVG_TRANSFORM_MATRIX);
        return ret;
    }

    /**
     * <b>DOM</b>: Implements {@link
     * SVGSVGElement#createSVGTransformFromMatrix(SVGMatrix)}.
     */
    public SVGTransform createSVGTransformFromMatrix(SVGMatrix matrix) {
        SVGOMTransform tr = new SVGOMTransform();
        tr.setMatrix(matrix);
        return tr;
    }

    /**
     * <b>DOM</b>: Implements {@link SVGSVGElement#getElementById(String)}.
     */
    public Element getElementById(String elementId) {
        return ownerDocument.getChildElementById(this, elementId);
    }

    // SVGLocatable ///////////////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGLocatable#getNearestViewportElement()}.
     */
    public SVGElement getNearestViewportElement() {
        return SVGLocatableSupport.getNearestViewportElement(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGLocatable#getFarthestViewportElement()}.
     */
    public SVGElement getFarthestViewportElement() {
        return SVGLocatableSupport.getFarthestViewportElement(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGLocatable#getBBox()}.
     */
    public SVGRect getBBox() {
        return SVGLocatableSupport.getBBox(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGLocatable#getCTM()}.
     */
    public SVGMatrix getCTM() {
        return SVGLocatableSupport.getCTM(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGLocatable#getScreenCTM()}.
     */
    public SVGMatrix getScreenCTM() {
        return SVGLocatableSupport.getScreenCTM(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGLocatable#getTransformToElement(SVGElement)}.
     */
    public SVGMatrix getTransformToElement(SVGElement element)
        throws SVGException {
        return SVGLocatableSupport.getTransformToElement(this, element);
    }

    // ViewCSS ////////////////////////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.views.AbstractView#getDocument()}.
     */
    public DocumentView getDocument() {
        return (DocumentView)getOwnerDocument();
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.css.ViewCSS#getComputedStyle(Element,String)}.
     */
    public CSSStyleDeclaration getComputedStyle(Element elt,
                                                String pseudoElt) {
        AbstractView av = ((DocumentView)getOwnerDocument()).getDefaultView();
        return ((ViewCSS)av).getComputedStyle(elt, pseudoElt);
    }

    // DocumentEvent /////////////////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.events.DocumentEvent#createEvent(String)}.
     */
    public Event createEvent(String eventType) throws DOMException {
        return ((DocumentEvent)getOwnerDocument()).createEvent(eventType);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.events.DocumentEvent#canDispatch(String,String)}.
     */
    public boolean canDispatch(String namespaceURI, String type)
            throws DOMException {
        AbstractDocument doc = (AbstractDocument) getOwnerDocument();
        return doc.canDispatch(namespaceURI, type);
    }

    // DocumentCSS ////////////////////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.stylesheets.DocumentStyle#getStyleSheets()}.
     */
    public StyleSheetList getStyleSheets() {
        return ((DocumentStyle)getOwnerDocument()).getStyleSheets();
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.css.DocumentCSS#getOverrideStyle(Element,String)}.
     */
    public CSSStyleDeclaration getOverrideStyle(Element elt,
                                                String pseudoElt) {
        return ((DocumentCSS)getOwnerDocument()).getOverrideStyle(elt,
                                                                  pseudoElt);
    }

    // SVGLangSpace support //////////////////////////////////////////////////

    /**
     * <b>DOM</b>: Returns the xml:lang attribute value.
     */
    public String getXMLlang() {
        return XMLSupport.getXMLLang(this);
    }

    /**
     * <b>DOM</b>: Sets the xml:lang attribute value.
     */
    public void setXMLlang(String lang) {
        setAttributeNS(XML_NAMESPACE_URI, XML_LANG_QNAME, lang);
    }

    /**
     * <b>DOM</b>: Returns the xml:space attribute value.
     */
    public String getXMLspace() {
        return XMLSupport.getXMLSpace(this);
    }

    /**
     * <b>DOM</b>: Sets the xml:space attribute value.
     */
    public void setXMLspace(String space) {
        setAttributeNS(XML_NAMESPACE_URI, XML_SPACE_QNAME, space);
    }

    // SVGZoomAndPan support ///////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGZoomAndPan#getZoomAndPan()}.
     */
    public short getZoomAndPan() {
        return SVGZoomAndPanSupport.getZoomAndPan(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGZoomAndPan#getZoomAndPan()}.
     */
    public void setZoomAndPan(short val) {
        SVGZoomAndPanSupport.setZoomAndPan(this, val);
    }

    // SVGFitToViewBox support ////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGFitToViewBox#getViewBox()}.
     */
    public SVGAnimatedRect getViewBox() {
        return viewBox;
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGFitToViewBox#getPreserveAspectRatio()}.
     */
    public SVGAnimatedPreserveAspectRatio getPreserveAspectRatio() {
        return preserveAspectRatio;
    }

    // SVGExternalResourcesRequired support /////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGExternalResourcesRequired#getExternalResourcesRequired()}.
     */
    public SVGAnimatedBoolean getExternalResourcesRequired() {
        return externalResourcesRequired;
    }

    // SVGTests support ///////////////////////////////////////////////////

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGTests#getRequiredFeatures()}.
     */
    public SVGStringList getRequiredFeatures() {
        return SVGTestsSupport.getRequiredFeatures(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGTests#getRequiredExtensions()}.
     */
    public SVGStringList getRequiredExtensions() {
        return SVGTestsSupport.getRequiredExtensions(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGTests#getSystemLanguage()}.
     */
    public SVGStringList getSystemLanguage() {
        return SVGTestsSupport.getSystemLanguage(this);
    }

    /**
     * <b>DOM</b>: Implements {@link
     * org.w3c.dom.svg.SVGTests#hasExtension(String)}.
     */
    public boolean hasExtension(String extension) {
        return SVGTestsSupport.hasExtension(this, extension);
    }

    /**
     * Returns the AttributeInitializer for this element type.
     * @return null if this element has no attribute with a default value.
     */
    protected AttributeInitializer getAttributeInitializer() {
        return attributeInitializer;
    }

    /**
     * Returns a new uninitialized instance of this object's class.
     */
    protected Node newNode() {
        return new SVGOMSVGElement();
    }

    /**
     * Returns the table of TraitInformation objects for this element.
     */
    protected DoublyIndexedTable getTraitInformationTable() {
        return xmlTraitInformation;
    }
}