db17be34f6
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.4-rc1@3001 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
112 lines
4.1 KiB
JavaScript
112 lines
4.1 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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/**
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* Write-only GeoRSS.
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* @requires OpenLayers/Format.js
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*/
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OpenLayers.Format.GeoRSS = OpenLayers.Class.create();
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OpenLayers.Format.GeoRSS.prototype =
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OpenLayers.Class.inherit( OpenLayers.Format, {
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rssns: "http://backend.userland.com/rss2",
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featureNS: "http://mapserver.gis.umn.edu/mapserver",
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georssns: "http://www.georss.org/georss",
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/**
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* Accept Feature Collection, and return a string.
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*
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* @param {Array} List of features to serialize into a string.
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*/
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write: function(features) {
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var featureCollection = document.createElementNS(this.rssns, "rss");
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for (var i=0; i < features.length; i++) {
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featureCollection.appendChild(this.createFeatureXML(features[i]));
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}
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return featureCollection;
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},
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/**
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* Accept an OpenLayers.Feature.Vector, and build a geometry for it.
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*
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* @param OpenLayers.Feature.Vector feature
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* @returns DOMElement
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*/
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createFeatureXML: function(feature) {
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var geometryNode = this.buildGeometryNode(feature.geometry);
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var featureNode = document.createElementNS(this.rssns, "item");
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var titleNode = document.createElementNS(this.rssns, "title");
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titleNode.appendChild(document.createTextNode(feature.attributes.title ? feature.attributes.title : ""));
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var descNode = document.createElementNS(this.rssns, "description");
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descNode.appendChild(document.createTextNode(feature.attributes.description ? feature.attributes.description : ""));
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featureNode.appendChild(titleNode);
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featureNode.appendChild(descNode);
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for(var attr in feature.attributes) {
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var attrText = document.createTextNode(feature.attributes[attr]);
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var nodename = attr;
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if (attr.search(":") != -1) {
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nodename = attr.split(":")[1];
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}
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var attrContainer = document.createElementNS(this.featureNS, "feature:"+nodename);
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attrContainer.appendChild(attrText);
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featureNode.appendChild(attrContainer);
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}
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featureNode.appendChild(geometryNode);
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return featureNode;
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},
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/**
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* builds a GeoRSS node with a given geometry
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*
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* @param {OpenLayers.Geometry} geometry
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*/
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buildGeometryNode: function(geometry) {
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var gml = "";
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// match MultiPolygon or Polygon
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if (geometry.CLASS_NAME == "OpenLayers.Geometry.Polygon") {
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gml = document.createElementNS(this.georssns, 'georss:polygon');
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gml.appendChild(this.buildCoordinatesNode(geometry.components[0]));
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}
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// match MultiLineString or LineString
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else if (geometry.CLASS_NAME == "OpenLayers.Geometry.LineString") {
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gml = document.createElementNS(this.georssns, 'georss:line');
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gml.appendChild(this.buildCoordinatesNode(geometry));
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}
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// match MultiPoint or Point
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else if (geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
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gml = document.createElementNS(this.georssns, 'georss:point');
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gml.appendChild(this.buildCoordinatesNode(geometry));
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} else {
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alert("Couldn't parse " + geometry.CLASS_NAME);
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}
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return gml;
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},
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buildCoordinatesNode: function(geometry) {
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var points = null;
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if (geometry.components) {
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points = geometry.components;
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}
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var path = "";
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if (points) {
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for (var i = 0; i < points.length; i++) {
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path += points[i].lat + " " + points[i].lon + " ";
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}
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} else {
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path += geometry.lat + " " + geometry.lon + " ";
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}
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return document.createTextNode(path);
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Format.GeoRSS"
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});
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