Metacat

/*

 * $Id: FlickrRest2Wfs.js 3883 2008-02-27 15:42:01Z gjvoosten $

 */

// Ensure this object's dependancies are loaded.

mapbuilder.loadScript(baseDir+"/tool/ToolBase.js");

/**

 * ad-hoc tool to load flickr rest feed with a single xsl transformation.

 * this tool populates its model on init.

 * @constructor

 * @param toolNode config node for this tool

 * @param model model that contains this tool

 */

function FlickrRest2Wfs(toolNode, model) {

  ToolBase.apply(this, new Array(toolNode, model));

  this.url = this.getProperty('mb:url');

  this.stylesheet = this.getProperty('mb:stylesheet');

  model.addListener('init', this.safeTransform, this);

}

/**

 * XSL transformation, works also on IE with external documents and proxy.

 * @param objRef reference to this tool

 */

FlickrRest2Wfs.prototype.safeTransform = function(objRef) {

  var url = config.proxyUrl+"?url="+escape(objRef.url);

  if (MB_IS_MOZ) {

    var xmlHttp = new XMLHttpRequest();

    xmlHttp.open("GET", url, false);

    xmlHttp.send('');

    var doc = xmlHttp.responseXML;

    var stylesheet = new XslProcessor(objRef.stylesheet, objRef.model.namespace);

    stylesheet.setParameter('proxyUrl', config.proxyUrl);

    objRef.model.doc = stylesheet.transformNodeToObject(doc);

  } else {

    var progids = {domdoc: ['Msxml2.DOMDocument.3.0', 'Msxml2.DOMDocument.6.0'],

          freethreaded: ['Msxml2.FreeThreadedDOMDocument.3.0', 'Msxml2.FreeThreadedDOMDocument.6.0'],

          xsltpl: ['MSXML2.XSLTemplate.3.0', 'MSXML2.XSLTemplate.6.0'],

          xmlhttp: ['Msxml2.XMLHTTP.3.0', 'Msxml2.XMLHTTP.6.0']};

    var xml;

    for (var i in progids.domdoc) {

      try {

        xml = new ActiveXObject(progids.domdoc[i]);

        break;

      } catch (e) {}

    }

    var xsl = new ActiveXObject(progids.freethreaded[i]);

    var docCache = new ActiveXObject(progids.xsltpl[i]);

    var xmlHttp = new ActiveXObject(progids.xmlhttp[i]);

    xmlHttp.open('GET', objRef.stylesheet, false);

    xmlHttp.send(null);

    var xslText = xmlHttp.responseText;

    // replace url-encoded "%"s in urls to %25, so they get

    // double-escaped. Ugly hack, but IE needs that.

    var regex = new RegExp("/\?url=(.[^']*)'/g");

    var toReplace = xslText.match(/\?url=(.[^']*)'/g);

    for (var i=0; i<toReplace.length; i++) {

    	xslText = xslText.replace(toReplace[i], toReplace[i].replace(/%/g,'%25'));

    }

    xml.validateOnParse = false;

    xsl.validateOnParse = false;

    xsl.resolveExternals = true;

    xsl.setProperty("AllowDocumentFunction",true); 

    xsl.async = false;

    xml.async = false;

    xsl.loadXML(xslText);

    xml.load(url);

    docCache.stylesheet = xsl;

    var docProcessor = docCache.createProcessor();

    docProcessor.input = xml;

    docProcessor.addParameter('proxyUrl', config.proxyUrl, '');

    docProcessor.transform();

    objRef.model.doc = (new DOMParser()).parseFromString(docProcessor.output, "text/xml"); 

  }

  objRef.model.callListeners('refresh');

}