* Copyright (C) 2010 Lukas Laag

* This file is part of lib-gwt-svg.

*

* libgwtsvg is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* libgwtsvg is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with libgwtsvg.  If not, see http://www.gnu.org/licenses/

**********************************************/

* Xpath support for IE, based on Cameron McCormack's library

* (http://mcc.id.au/xpathjs)

*/

    static Resource INSTANCE = GWT.create(Resource.class);

    @Source("xpath.js")

    TextResource xpath();

  }

 

  public DOMHelperImplIE() {

    // Inject the xpath.js script in the iframe document (not

    // in the main document, otherwise the added code will not be

    // seen by the GWT code which lives in the iframe document)

    Document doc = getIFrameDocument();

    ScriptElement scriptElem = doc.createScriptElement(Resource.INSTANCE.xpath().getText());

    doc.getBody().appendChild(scriptElem);

    initXPath();

  }

 

  protected native void initXPath() /*-{

    $wnd.xpp = new XPathParser();

   

    // Create a custom namespace resolver

    SvgNamespaceResolver.prototype = new NamespaceResolver();

    SvgNamespaceResolver.prototype.constructor = SvgNamespaceResolver;

    SvgNamespaceResolver.superclass = NamespaceResolver.prototype;

    function SvgNamespaceResolver() {

      this.gwtresolver = null;

    }

   

    SvgNamespaceResolver.prototype.getNamespace = function(prefix, n) {

      var ns = null;

      if (this.gwtresolver != null) {

        ns = this.gwtresolver(prefix);

      }

      if (ns == null) {

        ns = n.namespaceURI;

      }

      if (ns == null) {

        ns = SvgNamespaceResolver.superclass.getNamespace(prefix, n);

      }

      return ns;

    };

    $wnd.xpr = new SvgNamespaceResolver();

  }-*/;

 

  public static native Document getIFrameDocument() /*-{

    return document;

  }-*/;

  @Override

  public native JavaScriptObject evaluateNodeListXPath_(Element svgElement, String expr, XPathPrefixResolver resolver) /*-{

    var xpath = new XPathExpression(expr, $wnd.xpr, $wnd.xpp);

    $wnd.xpr.gwtresolver = resolver ? function(prefix) { return resolver.@org.vectomatic.dom.svg.utils.XPathPrefixResolver::resolvePrefix(Ljava/lang/String;)(prefix); } : null;

    var result = xpath.evaluate(svgElement, XPathResult.ORDERED_NODE_ITERATOR_TYPE);

    return result;

  }-*/;

 

  @Override

  public native Node evaluateNodeXPath_(Element svgElement, String expr, XPathPrefixResolver resolver) /*-{

    var xpath = new XPathExpression(expr, $wnd.xpr, $wnd.xpp);

    $wnd.xpr.gwtresolver = resolver ? function(prefix) { return resolver.@org.vectomatic.dom.svg.utils.XPathPrefixResolver::resolvePrefix(Ljava/lang/String;)(prefix); } : null;

    var result = xpath.evaluate(svgElement, XPathResult.ANY_UNORDERED_NODE_TYPE);

    return result.singleNodeValue;

  }-*/;

 

  @Override

  public native String evaluateStringXPath_(Element svgElement, String expr, XPathPrefixResolver resolver) /*-{

    var xpath = new XPathExpression(expr, $wnd.xpr, $wnd.xpp);

    $wnd.xpr.gwtresolver = resolver ? function(prefix) { return resolver.@org.vectomatic.dom.svg.utils.XPathPrefixResolver::resolvePrefix(Ljava/lang/String;)(prefix); } : null;

    var result = xpath.evaluate(svgElement, XPathResult.STRING_TYPE);

    return result.stringValue;

  }-*/;

 

  @Override

  public native float evaluateNumberXPath_(Element svgElement, String expr, XPathPrefixResolver resolver) /*-{

    var xpath = new XPathExpression(expr, $wnd.xpr, $wnd.xpp);

    $wnd.xpr.gwtresolver = resolver ? function(prefix) { return resolver.@org.vectomatic.dom.svg.utils.XPathPrefixResolver::resolvePrefix(Ljava/lang/String;)(prefix); } : null;

    var result = xpath.evaluate(svgElement, XPathResult.NUMBER_TYPE);

    return result.numberValue;

  }-*/;

 

  @Override

  public native boolean evaluateBooleanXPath_(Element svgElement, String expr, XPathPrefixResolver resolver) /*-{

    var xpath = new XPathExpression(expr, $wnd.xpr, $wnd.xpp);

    $wnd.xpr.gwtresolver = resolver ? function(prefix) { return resolver.@org.vectomatic.dom.svg.utils.XPathPrefixResolver::resolvePrefix(Ljava/lang/String;)(prefix); } : null;

    var result = xpath.evaluate(svgElement, XPathResult.BOOLEAN_TYPE);

    return result.booleanValue;

  }-*/;