From 011285aefeb6c7520db279ec2cffd587f60d4abb Mon Sep 17 00:00:00 2001
From: Alexandre Silva <amsilva@infoportugal.impresa.pt>
Date: Mon, 16 Oct 2017 14:51:55 +0100
Subject: [PATCH] Added option to the ol.format.GeoJSON to allow the reading of
 the geometry_name from the geojson.

---
 externs/geojson.js       |  5 +++++
 externs/olx.js           | 12 ++++++++++++
 src/ol/format/geojson.js |  9 +++++++++
 3 files changed, 26 insertions(+)

diff --git a/externs/geojson.js b/externs/geojson.js
index 4dbe44a8d3..108fbe494c 100644
--- a/externs/geojson.js
+++ b/externs/geojson.js
@@ -140,6 +140,11 @@ GeoJSONFeature.prototype.id;
 GeoJSONFeature.prototype.properties;
 
 
+/**
+ * @type {string|undefined}
+ */
+GeoJSONFeature.prototype.geometry_name;
+
 
 /**
  * @constructor
diff --git a/externs/olx.js b/externs/olx.js
index 22e1921606..318af1996f 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -1994,6 +1994,7 @@ olx.format.WriteOptions.prototype.decimals;
 /**
  * @typedef {{defaultDataProjection: ol.ProjectionLike,
  *     geometryName: (string|undefined),
+ *     readGeometryNameFromGeoJSON: (boolean|undefined),
  *     featureProjection: ol.ProjectionLike}}
  */
 olx.format.GeoJSONOptions;
@@ -2024,6 +2025,17 @@ olx.format.GeoJSONOptions.prototype.featureProjection;
 olx.format.GeoJSONOptions.prototype.geometryName;
 
 
+/**
+ * Certain GeoJSON providers include the geometry_name field in the feature
+ * geoJSON. If set to `true` the geoJSON reader will look for that field to
+ * set the geometry name. If both this field is set to `true` and a
+ * `geometryName` is provided the `geometryName` will take precedence.
+ * @type {boolean|undefined}
+ * @api
+ */
+olx.format.GeoJSONOptions.prototype.readGeometryNameFromGeoJSON;
+
+
 /**
  * @typedef {{geometryName: (string|undefined)}}
  */
diff --git a/src/ol/format/geojson.js b/src/ol/format/geojson.js
index f3f18e386c..ad053e1de8 100644
--- a/src/ol/format/geojson.js
+++ b/src/ol/format/geojson.js
@@ -53,6 +53,13 @@ ol.format.GeoJSON = function(opt_options) {
    */
   this.geometryName_ = options.geometryName;
 
+  /**
+   * Look for the geometry name in the feature GeoJSON
+   * @type {boolean|undefined}
+   * @private
+   */
+  this.readGeometryNameFromGeoJSON_ = options.readGeometryNameFromGeoJSON;
+
 };
 ol.inherits(ol.format.GeoJSON, ol.format.JSONFeature);
 
@@ -377,6 +384,8 @@ ol.format.GeoJSON.prototype.readFeatureFromObject = function(
   var feature = new ol.Feature();
   if (this.geometryName_) {
     feature.setGeometryName(this.geometryName_);
+  } else if (this.readGeometryNameFromGeoJSON_ && geoJSONFeature.geometry_name !== undefined) {
+    feature.setGeometryName(geoJSONFeature.geometry_name);
   }
   feature.setGeometry(geometry);
   if (geoJSONFeature.id !== undefined) {