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featureloader.js
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featureloader.js
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goog.provide('ol.featureloader');
goog.require('goog.asserts');
goog.require('ol.TileState');
goog.require('ol.VectorTile');
goog.require('ol.format.FormatType');
goog.require('ol.proj');
goog.require('ol.proj.Projection');
goog.require('ol.xml');
/**
* @param {string|ol.FeatureUrlFunction} url Feature URL service.
* @param {ol.format.Feature} format Feature format.
* @param {function(this:ol.VectorTile, Array.<ol.Feature>, ol.proj.Projection)|function(this:ol.source.Vector, Array.<ol.Feature>)} success
* Function called with the loaded features and optionally with the data
* projection. Called with the vector tile or source as `this`.
* @param {function(this:ol.VectorTile)|function(this:ol.source.Vector)} failure
* Function called when loading failed. Called with the vector tile or
* source as `this`.
* @return {ol.FeatureLoader} The feature loader.
*/
ol.featureloader.loadFeaturesXhr = function(url, format, success, failure) {
return (
/**
* @param {ol.Extent} extent Extent.
* @param {number} resolution Resolution.
* @param {ol.proj.Projection} projection Projection.
* @this {ol.source.Vector|ol.VectorTile}
*/
function(extent, resolution, projection) {
var xhr = new XMLHttpRequest();
xhr.open('GET',
goog.isFunction(url) ? url(extent, resolution, projection) : url,
true);
if (format.getType() == ol.format.FormatType.ARRAY_BUFFER) {
xhr.responseType = 'arraybuffer';
}
/**
* @param {Event} event Event.
* @private
*/
xhr.onload = function(event) {
if (xhr.status >= 200 && xhr.status < 300) {
var type = format.getType();
/** @type {Document|Node|Object|string|undefined} */
var source;
if (type == ol.format.FormatType.JSON ||
type == ol.format.FormatType.TEXT) {
source = xhr.responseText;
} else if (type == ol.format.FormatType.XML) {
source = xhr.responseXML;
if (!source) {
source = ol.xml.parse(xhr.responseText);
}
} else if (type == ol.format.FormatType.ARRAY_BUFFER) {
source = /** @type {ArrayBuffer} */ (xhr.response);
} else {
goog.asserts.fail('unexpected format type');
}
if (source) {
success.call(this, format.readFeatures(source,
{featureProjection: projection}),
format.readProjection(source));
} else {
goog.asserts.fail('undefined or null source');
}
} else {
failure.call(this);
}
}.bind(this);
xhr.send();
});
};
/**
* Create an XHR feature loader for a `url` and `format`. The feature loader
* loads features (with XHR), parses the features, and adds them to the
* vector tile.
* @param {string|ol.FeatureUrlFunction} url Feature URL service.
* @param {ol.format.Feature} format Feature format.
* @return {ol.FeatureLoader} The feature loader.
* @api
*/
ol.featureloader.tile = function(url, format) {
return ol.featureloader.loadFeaturesXhr(url, format,
/**
* @param {Array.<ol.Feature>} features The loaded features.
* @param {ol.proj.Projection} dataProjection Data projection.
* @this {ol.VectorTile}
*/
function(features, dataProjection) {
this.setProjection(dataProjection);
this.setFeatures(features);
},
/**
* @this {ol.VectorTile}
*/
function() {
this.setState(ol.TileState.ERROR);
});
};
/**
* Create an XHR feature loader for a `url` and `format`. The feature loader
* loads features (with XHR), parses the features, and adds them to the
* vector source.
* @param {string|ol.FeatureUrlFunction} url Feature URL service.
* @param {ol.format.Feature} format Feature format.
* @return {ol.FeatureLoader} The feature loader.
* @api
*/
ol.featureloader.xhr = function(url, format) {
return ol.featureloader.loadFeaturesXhr(url, format,
/**
* @param {Array.<ol.Feature>} features The loaded features.
* @param {ol.proj.Projection} dataProjection Data projection.
* @this {ol.source.Vector}
*/
function(features, dataProjection) {
this.addFeatures(features);
}, /* FIXME handle error */ ol.nullFunction);
};