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formatvectorsource.js
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formatvectorsource.js
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// FIXME consider delaying feature reading so projection can be provided by
// consumer (e.g. the view)
goog.provide('ol.source.FormatVector');
goog.require('goog.asserts');
goog.require('goog.dispose');
goog.require('goog.events');
goog.require('goog.net.EventType');
goog.require('goog.net.XhrIo');
goog.require('goog.net.XhrIo.ResponseType');
goog.require('goog.userAgent');
goog.require('ol.BrowserFeature');
goog.require('ol.format.FormatType');
goog.require('ol.proj');
goog.require('ol.source.State');
goog.require('ol.source.Vector');
goog.require('ol.xml');
/**
* @constructor
* @extends {ol.source.Vector}
* @param {olx.source.FormatVectorOptions} options Options.
* @todo stability experimental
*/
ol.source.FormatVector = function(options) {
goog.base(this, {
attributions: options.attributions,
extent: options.extent,
logo: options.logo,
projection: options.projection
});
/**
* @protected
* @type {ol.format.Feature}
*/
this.format = options.format;
};
goog.inherits(ol.source.FormatVector, ol.source.Vector);
/**
* @param {goog.Uri|string} url URL.
* @param {function(this: T, Array.<ol.Feature>)} callback Callback.
* @param {T} thisArg Value to use as `this` when executing `callback`.
* @template T
*/
ol.source.FormatVector.prototype.loadFeaturesFromURL =
function(url, callback, thisArg) {
var xhrIo = new goog.net.XhrIo();
var type = this.format.getType();
var responseType;
// FIXME maybe use ResponseType.DOCUMENT?
if (type == ol.format.FormatType.BINARY &&
ol.BrowserFeature.HAS_ARRAY_BUFFER) {
responseType = goog.net.XhrIo.ResponseType.ARRAY_BUFFER;
} else {
responseType = goog.net.XhrIo.ResponseType.TEXT;
}
xhrIo.setResponseType(responseType);
goog.events.listen(xhrIo, goog.net.EventType.COMPLETE,
/**
* @param {Event} event Event.
* @private
* @this {ol.source.FormatVector}
*/
function(event) {
var xhrIo = event.target;
goog.asserts.assertInstanceof(xhrIo, goog.net.XhrIo);
if (xhrIo.isSuccess()) {
var type = this.format.getType();
/** @type {ArrayBuffer|Document|Node|Object|string|undefined} */
var source;
if (type == ol.format.FormatType.BINARY &&
ol.BrowserFeature.HAS_ARRAY_BUFFER) {
source = xhrIo.getResponse();
goog.asserts.assertInstanceof(source, ArrayBuffer);
} else if (type == ol.format.FormatType.JSON) {
source = xhrIo.getResponseText();
} else if (type == ol.format.FormatType.TEXT) {
source = xhrIo.getResponseText();
} else if (type == ol.format.FormatType.XML) {
if (!goog.userAgent.IE) {
source = xhrIo.getResponseXml();
}
if (!goog.isDefAndNotNull(source)) {
source = ol.xml.load(xhrIo.getResponseText());
}
} else {
goog.asserts.fail();
}
if (goog.isDefAndNotNull(source)) {
callback.call(thisArg, this.readFeatures(source));
} else {
this.setState(ol.source.State.ERROR);
goog.asserts.fail();
}
} else {
this.setState(ol.source.State.ERROR);
}
goog.dispose(xhrIo);
}, false, this);
xhrIo.send(url);
};
/**
* @param {ArrayBuffer|Document|Node|Object|string} source Source.
* @return {Array.<ol.Feature>} Features.
*/
ol.source.FormatVector.prototype.readFeatures = function(source) {
var format = this.format;
var features = format.readFeatures(source);
var featureProjection = format.readProjection(source);
var projection = this.getProjection();
if (!goog.isNull(projection)) {
if (!ol.proj.equivalent(featureProjection, projection)) {
var transform = ol.proj.getTransform(featureProjection, projection);
var i, ii;
for (i = 0, ii = features.length; i < ii; ++i) {
var feature = features[i];
var geometry = feature.getGeometry();
if (!goog.isNull(geometry)) {
geometry.transform(transform);
}
}
}
}
return features;
};