Metacat

/*

License: LGPL as per: http://www.gnu.org/copyleft/lesser.html

$Id: $

*/

// Ensure this object's dependencies are loaded.

mapbuilder.loadScript(baseDir+"/widget/WidgetBaseXSL.js");

// For customised searching/loading indication

httpStatusMsg = ['uninitialized','searching','loaded','building results list','completed'];

/**

 * Display a Catalog Search form.

 * @constructor

 * @base WidgetBaseXSL

 * @param widgetNode  The widget's XML object node from the configuration document.

 * @param model       The model object that this widget belongs to.

 */

function CatalogSearchForm(widgetNode, model) {

  WidgetBaseXSL.apply(this,new Array(widgetNode, model));

  this.targetContext         = this.getProperty("mb:targetContext");

  this.wrsUrl                = this.getProperty("mb:wrsUrl");

  this.wrsServiceAssociation = this.getProperty("mb:wrsServiceAssociation");

  this.convert2ContextXsl    = this.getProperty("mb:convert2ContextXsl");

  this.queryXsl              = this.getProperty("mb:queryXsl");

  this.httpPayload = new Object();

  this.httpPayload.url = this.wrsUrl;

  this.httpPayload.method = "post";

  this.mapModel = this.getProperty("mb:mapModel") || model.id;

  /**

   * Refreshes the form onblur handlers when this widget is painted.

   * @param objRef Pointer to this CurorTrack object.

   */

  this.postPaint = function() {

    //config.objects[this.mapModel].addListener('aoi', this.displayAoiCoords, this);

    this.searchForm = document.getElementById(this.formName);

    this.searchForm.parentWidget = this;

    //this.searchForm.westCoord.model = this.model;

    //this.searchForm.northCoord.model = this.model;

    //this.searchForm.eastCoord.model = this.model;

    //this.searchForm.southCoord.model = this.model;

    this.searchForm.onkeypress = this.handleKeyPress;

  }

  /**

   * Output the AOI coordinates to the associated form input elements.  This

   * method is registered as an AOI listener on the context doc.

   * @param objRef Pointer to this searchForm object.

   */

  //CatalogSearchForm.prototype.displayAoiCoords = function(objRef) {

    //var aoi = config.objects[objRef.mapModel].getParam("aoi");

    //objRef.searchForm.westCoord.value = aoi[0][0];

    //objRef.searchForm.northCoord.value = aoi[0][1];

    //objRef.searchForm.eastCoord.value = aoi[1][0];

    //objRef.searchForm.southCoord.value = aoi[1][1];

  //}

  /**

   * Handles user input from the form element.  This is an onblur handler for 

   * the input elements.

   */

  CatalogSearchForm.prototype.setAoi = function() {

//    var aoi = config.objects[this.mapModel].getParam("aoi");

//    if (aoi) {

//      var ul = aoi[0];

//      var lr = aoi[1];

//      switch(this.name) {

//        case 'westCoord':

//          ul[0] = this.value;

//          break;

//        case 'northCoord':

//          ul[1] = this.value;

//          break;

//        case 'eastCoord':

//          lr[0] = this.value;

//          break;

//        case 'southCoord':

//          lr[1] = this.value;

//          break;

//      }

//      config.objects[this.mapModel].setParam("aoi",new Array(ul,lr) );

//    }

  }

/**

 * Change the AOI coordinates from select box choice of prefined locations

 * @param bbox the bbox value of the location keyword chosen

 */

  CatalogSearchForm.prototype.setLocation = function(bbox) {

    var bboxArray = new Array();

    bboxArray     = bbox.split(",");

    var ul = new Array(parseFloat(bboxArray[0]),parseFloat(bboxArray[2]));

    var lr = new Array(parseFloat(bboxArray[1]),parseFloat(bboxArray[3]));

    config.objects[this.mapModel].setParam("aoi",new Array(ul,lr));

  }

  /**

   * Build and send a catalog query. The results will be inserted into the

   * targetModel which will trigger an event to handleResponse().

   * 

   * @return none 

   */

  CatalogSearchForm.prototype.doSelect = function() {

    // Register for an event sent after the catalog query has finished

    if(!this.initialized){

      this.targetModel.addListener("loadModel",this.handleResponse,this);

      this.xslProcessor = new XslProcessor(this.convert2ContextXsl);

      this.initialized=1;

    }

    // call buildQuery method to read form values, put them into the model

    // and perform an XSL translation to get the WRS Query

    var wrsQueryXML = this.buildQuery();

    // POST the query to the WRS Service configured in config.xml (wrsUrl)

    this.httpPayload.postData= wrsQueryXML;

    this.targetModel.transactionType="insert";

    this.targetModel.newRequest(this.targetModel,this.httpPayload);

    // Load the new model

    // Disabled, otherwise the loading indicator doesn't work

    //this.targetModel.callListeners("loadModel");

    // Activate the loading indicator

    this.targetModel.callListeners("refresh");

  }

  /**

   * Builds WRS Catalog query 

   * returns: WRS Query XML (string)

   * 

   * @return wrsQueryXML A textual representation of the WRS Query XML

   */

  CatalogSearchForm.prototype.buildQuery = function() {

    // Get the reference to the form

    this.searchForm = document.getElementById(this.formName);

    // Fill the model with the values needed for building the query

    // TBD: This is not a correct way to address the model, since the form values will disappear when

    //      the model changes. View needs to correspond to the model.

    // added empty string '' to prevent IE from crashing on empty/null values

    this.model.setXpathValue(this.model, "/filter/keywords", this.searchForm.keywords.value + '', false);

    this.model.setXpathValue(this.model, "/filter/servicetype", this.searchForm.serviceType.value + '', false);

    this.model.setXpathValue(this.model, "/filter/serviceassociation", this.wrsServiceAssociation + '', false);

	  // determine the BBox

    var aoi = config.objects[this.mapModel].getParam("aoi");

    var bboxStr = "";

    if (aoi) {

      // a bbox was set in the map pane

      bboxStr = aoi[0][0]+","+aoi[1][1]+" "+aoi[1][0]+","+aoi[0][1];

    } else {

      // no bbox was set, use the bbox of the map model

      var bbox = config.objects[this.mapModel].getBoundingBox();

      bboxStr = bbox[0]+","+bbox[1]+" "+bbox[2]+","+bbox[3];

    }

    // Add location based filter (BBOX)

    // TBD: uncomment this line below when WRS filtering works OK

    //this.model.setXpathValue(this.model, "/filter/location", bboxStr, false);

    // Load the XSL to generate the WRS Query

    //this.wrsQuery=new XslProcessor(baseDir+"/tool/xsl/wrs_Query.xsl");

    var queryProcessor = new XslProcessor(this.queryXsl);

    // Add filter to XSL as a parameter

    queryProcessor.setParameter("filter", this.model.doc);

    // Do the actual XSL translation to generate the WRS Query

    var wrsQueryXML = queryProcessor.transformNodeToString(this.model.doc);

    return wrsQueryXML;

  }

  /**

   * Convert the response of a Catalog Query into an OWSContext document

   * so that it can be processed.

   * Called after the response from a Catalog query has been received and 

   * populated in the targetModel.

   * @param objRef Pointer to widget object.

   */

  CatalogSearchForm.prototype.handleResponse = function(objRef) {

    var newContext=objRef.xslProcessor.transformNodeToObject(objRef.targetModel.doc);

    window.config.objects[objRef.targetContext].setModel(

      window.config.objects[objRef.targetContext],

      newContext);

  }

  //set some properties for the form output

  this.formName = "WebServiceForm_" + mbIds.getId();

  this.stylesheet.setParameter("formName", this.formName);

}