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Viewing file: HTTPRequest.js (7.03 KB) -rw-rw-rw- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for * full list of contributors). Published under the Clear BSD license. * See http://svn.openlayers.org/trunk/openlayers/license.txt for the * full text of the license. */ /** * @requires OpenLayers/Layer.js */ /** * Class: OpenLayers.Layer.HTTPRequest * * Inherits from: * - <OpenLayers.Layer> */ OpenLayers.Layer.HTTPRequest = OpenLayers.Class(OpenLayers.Layer, { /** * Constant: URL_HASH_FACTOR * {Float} Used to hash URL param strings for multi-WMS server selection. * Set to the Golden Ratio per Knuth's recommendation. */ URL_HASH_FACTOR: (Math.sqrt(5) - 1) / 2, /** * Property: url * {Array(String) or String} This is either an array of url strings or * a single url string. */ url: null, /** * Property: params * {Object} Hashtable of key/value parameters */ params: null, /** * APIProperty: reproject * *Deprecated*. See http://trac.openlayers.org/wiki/SpatialMercator * for information on the replacement for this functionality. * {Boolean} Whether layer should reproject itself based on base layer * locations. This allows reprojection onto commercial layers. * Default is false: Most layers can't reproject, but layers * which can create non-square geographic pixels can, like WMS. * */ reproject: false, /** * Constructor: OpenLayers.Layer.HTTPRequest * * Parameters: * name - {String} * url - {Array(String) or String} * params - {Object} * options - {Object} Hashtable of extra options to tag onto the layer */ initialize: function(name, url, params, options) { var newArguments = arguments; newArguments = [name, options]; OpenLayers.Layer.prototype.initialize.apply(this, newArguments); this.url = url; this.params = OpenLayers.Util.extend( {}, params); }, /** * APIMethod: destroy */ destroy: function() { this.url = null; this.params = null; OpenLayers.Layer.prototype.destroy.apply(this, arguments); }, /** * APIMethod: clone * * Parameters: * obj - {Object} * * Returns: * {<OpenLayers.Layer.HTTPRequest>} An exact clone of this * <OpenLayers.Layer.HTTPRequest> */ clone: function (obj) { if (obj == null) { obj = new OpenLayers.Layer.HTTPRequest(this.name, this.url, this.params, this.getOptions()); } //get all additions from superclasses obj = OpenLayers.Layer.prototype.clone.apply(this, [obj]); // copy/set any non-init, non-simple values here return obj; }, /** * APIMethod: setUrl * * Parameters: * newUrl - {String} */ setUrl: function(newUrl) { this.url = newUrl; }, /** * APIMethod: mergeNewParams * * Parameters: * newParams - {Object} * * Returns: * redrawn: {Boolean} whether the layer was actually redrawn. */ mergeNewParams:function(newParams) { this.params = OpenLayers.Util.extend(this.params, newParams); var ret = this.redraw(); if(this.map != null) { this.map.events.triggerEvent("changelayer", { layer: this, property: "params" }); } return ret; }, /** * APIMethod: redraw * Redraws the layer. Returns true if the layer was redrawn, false if not. * * Parameters: * force - {Boolean} Force redraw by adding random parameter. * * Returns: * {Boolean} The layer was redrawn. */ redraw: function(force) { if (force) { return this.mergeNewParams({"_olSalt": Math.random()}); } else { return OpenLayers.Layer.prototype.redraw.apply(this, []); } }, /** * Method: selectUrl * selectUrl() implements the standard floating-point multiplicative * hash function described by Knuth, and hashes the contents of the * given param string into a float between 0 and 1. This float is then * scaled to the size of the provided urls array, and used to select * a URL. * * Parameters: * paramString - {String} * urls - {Array(String)} * * Returns: * {String} An entry from the urls array, deterministically selected based * on the paramString. */ selectUrl: function(paramString, urls) { var product = 1; for (var i=0, len=paramString.length; i<len; i++) { product *= paramString.charCodeAt(i) * this.URL_HASH_FACTOR; product -= Math.floor(product); } return urls[Math.floor(product * urls.length)]; }, /** * Method: getFullRequestString * Combine url with layer's params and these newParams. * * does checking on the serverPath variable, allowing for cases when it * is supplied with trailing ? or &, as well as cases where not. * * return in formatted string like this: * "server?key1=value1&key2=value2&key3=value3" * * WARNING: The altUrl parameter is deprecated and will be removed in 3.0. * * Parameters: * newParams - {Object} * altUrl - {String} Use this as the url instead of the layer's url * * Returns: * {String} */ getFullRequestString:function(newParams, altUrl) { // if not altUrl passed in, use layer's url var url = altUrl || this.url; // create a new params hashtable with all the layer params and the // new params together. then convert to string var allParams = OpenLayers.Util.extend({}, this.params); allParams = OpenLayers.Util.extend(allParams, newParams); var paramsString = OpenLayers.Util.getParameterString(allParams); // if url is not a string, it should be an array of strings, // in which case we will deterministically select one of them in // order to evenly distribute requests to different urls. // if (url instanceof Array) { url = this.selectUrl(paramsString, url); } // ignore parameters that are already in the url search string var urlParams = OpenLayers.Util.upperCaseObject(OpenLayers.Util.getParameters(url)); for(var key in allParams) { if(key.toUpperCase() in urlParams) { delete allParams[key]; } } paramsString = OpenLayers.Util.getParameterString(allParams); return OpenLayers.Util.urlAppend(url, paramsString); }, CLASS_NAME: "OpenLayers.Layer.HTTPRequest" }); |
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