Metacat

$Id: Context.js 3887 2008-02-27 18:18:53Z ahocevar $

// Ensure this object's dependancies are loaded.

mapbuilder.loadScript(baseDir+"/model/ModelBase.js");

 * Stores a Web Map Context (WMC) document as defined by the Open Geospatial Consortium

 * (http://www.opengeospatial.org/) and extensions the the WMC.

  *

   * @param layerId  The name of the layer that is to be changed

  this.setHidden=function(layerId, hidden){

    var layer = this.getLayer(layerId);

    this.callListeners("hidden", layerId);

   * @param layerId  The name of the layer that is to be changed

  this.getHidden=function(layerId){

    var layer = this.getLayer(layerId);

    var bbox = new Array();

    // Extract BoundingBox from the context

    if (window.cgiArgs["bbox"]) {   //set as minx,miny,maxx,maxy

      objRef.setBoundingBox(bbox);

  this.addListener( "loadModel", this.initBbox, this );

  //this.addListener( "contextLoaded", this.initBbox, this );

   * Set the Spatial Reference System for the context document.

   * Get the Spatial Reference System from the context document.

    srs = srs ? srs : 'EPSG:4326';

   * Get the Projection object from the context document.

   * @return Proj Object of  The Spatial Reference System.

   */

  this.initProj=function(objRef) {

    objRef.proj=new OpenLayers.Projection(objRef.getSRS());

  }

  this.addFirstListener( "loadModel", this.initProj, this );

  /**

   * @param width The width of map window to set in the context document

   * Returns the width/height of the map window as an array

   */

  this.getWindowSize=function() {

    var win=this.doc.selectSingleNode("/wmc:ViewContext/wmc:General/wmc:Window");

    return new Array(win.getAttribute("width"), win.getAttribute("height"));

  }

  /**

   * Set the Window width and height in one function call to avoid a resize event in between

   * setting width and height, because that causes checkBbox to be triggered, which adjusts the

   * bbox then when it should not yet be adjusted.

   * Added by VTS for dynamic map window resizing (AutoResize tool)

   * @param size Size of the map window as (width, height) array

   */

  this.setWindowSize=function(size) {

    var width = size[0];

    var height = size[1];

    var win=this.doc.selectSingleNode("/wmc:ViewContext/wmc:General/wmc:Window");

    win.setAttribute("width", width);

    win.setAttribute("height", height);

    this.callListeners("resize");

  }

  /**

   * Returns the Layer node with the specified name from the list of nodes

   * selected by the nodeSelectXpath from the capabilities doc.

   * @param featureName name of the featureType to look up

   * @return the Layer node with the specified name.

   */

  this.getFeatureNode = function(featureName) {

    return this.doc.selectSingleNode(this.nodeSelectXpath+"[wmc:Name='"+featureName+"']");

  }

  /**

   * @return URL for the GetMap request

  this.getVersion = function(feature) {

    var listNodeArray = this.doc.selectNodes("/wmc:ViewContext/wmc:LayerList/wmc:Layer[attribute::queryable='1']");

   * @param layerId the id of the layer to be returned

  this.getLayer = function(layerId) {

    var layer = this.doc.selectSingleNode("/wmc:ViewContext/wmc:LayerList/wmc:Layer[@id='"+layerId+"']");

    if (layer == null) {

      layer = this.doc.selectSingleNode("/wmc:ViewContext/wmc:LayerList/wmc:Layer[wmc:Name='"+layerId+"']");

    }

   * Method to get a layer id with the specified id/name in the context doc

   * @param layerName the name of the layer of which the id is to be returned

   * @return the id of the layer || false

   */

  this.getLayerIdByName = function(layerName) {

    var layer = this.getLayer(layerName);

    var id;

    if (layer) {

      id = layer.getAttribute("id");

    }

    return id || false;

  }

  /**

    parentNode.appendChild(layerNode);

    // Generate layer id if layer doesn't have an id

    if (!layerNode.getAttribute("id")) {

      var randomNumber = Math.round(10000 * Math.random());

      id = Mapbuilder.getProperty(layerNode, "wmc:Name") + "_" + randomNumber; 

      layerNode.setAttribute("id", id);

    }

 /**

   * Method to add a Sld tag to the StyleList

   * @param layerName the Layer name from another context doc or capabiltiies doc

   */

  this.addSLD = function(objRef,sldNode) {

    // alert("context addSLD : "+objRef.id);

    var layerName=Mapbuilder.getProperty(sldNode, "//Name");

    var parentNode = objRef.doc.selectSingleNode("//wmc:Layer[wmc:Name='"+layerName+"']");

    parentNode.appendChild(sldNode.cloneNode(true));

    objRef.modified = true;

    var attribs=[];

    attribs["sld_body"]=(new XMLSerializer()).serializeToString(objRef.doc.selectSingleNode("//wmc:Layer[wmc:Name='"+layerName+"']/wmc:StyleList/wmc:Style/wmc:SLD/wmc:StyledLayerDescriptor"));

	objRef.map.mbMapPane.refreshLayer(objRef.map.mbMapPane,layerName,attribs);

  }

  this.addFirstListener( "addSLD", this.addSLD, this );

   * @param layerId the Layer to be deleted

  this.deleteLayer = function(objRef, layerId) {

    var deletedNode = objRef.getLayer(layerId);

      alert(mbGetMessage("nodeNotFound", layerId));

   * @param layerId the layer to be moved

  this.moveLayerUp = function(objRef, layerId) {

    var movedNode = objRef.getLayer(layerId);

      alert(mbGetMessage("cantMoveUp", layerId));

   * @param layerId the layer to be moved

  this.moveLayerDown = function(objRef, layerId) {

    var movedNode = objRef.getLayer(layerId);

      alert(mbGetMessage("cantMoveDown", layerId));

   * will be created if it doesn't already exist.

   * This results in an XML structure with one element for each GetMap time value

   * @param objRef a pointer to this object

      var layerId;

      var layerNode = extentNode.parentNode.parentNode;

      if (layerNode.selectSingleNode("@id")) {

        layerId = Mapbuilder.getProperty(layerNode, "@id");

      } else {

        layerId = Mapbuilder.getProperty(layerNode, "wmc:Name");

      }

      objRef.timestampList.setAttribute("layerId", layerId);

      //alert("found time dimension, extent:"+getNodeValue(extentNode));

      var times = getNodeValue(extentNode).split(",");   //comma separated list of arguments

     objRef.setExtension(objRef.timestampList);

  /**

   * clear the time extent created by initTimeExtent

   * @param objRef reference to this model

   */

  this.clearTimeExtent = function( objRef ) {

    var tsList = objRef.timestampList;

    if (tsList) {

      tsList.parentNode.removeChild(tsList);

    }

  }

  this.addListener("newModel", this.clearTimeExtent, this);

   * @param layerId the name of the Layer from which the timestamp list was generated

  this.getCurrentTimestamp = function( layerId ) {

    return getNodeValue(this.timestampList.childNodes[index]);

  // PL -BRGM

  /**

   * Change a Layer's opacity

   * @param layerId  The name of the layer that is to be changed

   * @param Opacity     Value of the opacity

   */

  this.setOpacity=function(layerId, Opacity){

    // Set the hidden attribute in the Context

    var layer = this.getLayer(layerId);

    if (layer) layer.setAttribute("opacity", Opacity);

    // Call the listeners

    this.callListeners("opacity", layerId);

  }

  /**

   * Get the layer's opacity attribute value.

   * @param layerId  The name of the layer that is to be changed

   * @return hidden  String with the value; 1=hidden, 0=visible.

   */

  this.getOpacity=function(layerId){

    var opacity=1;

    var layer = this.getLayer(layerId);

    if (layer) opacity = layer.getAttribute("opacity");

    return opacity;

  }

  // PL -END