getProjection method on parsers

With this, vector sources/layers do not need to make
assumptions on the data projection.

src/objectliterals.jsdoc

@@ -514,7 +514,7 @@
  * @property {Object|string|undefined} data Data to parse.
  * @property {ol.Extent|undefined} extent Extent.
  * @property {string|undefined} logo Logo.
- * @property {ol.parser.Parser} parser Parser instance to parse data
+ * @property {ol.parser.FeatureParser} parser Parser instance to parse data
  *     provided as `data` or fetched from `url`.
  * @property {ol.ProjectionLike|undefined} projection Projection. EPSG:4326
  *     is assumed if not defined. TODO: Get projection from the parser instead

src/ol/layer/vectorlayer.js

@@ -418,7 +418,7 @@ ol.layer.Vector.prototype.groupFeaturesBySymbolizerLiteral =
 
 /**
  * @param {Object|Element|Document|string} data Feature data.
- * @param {ol.parser.Parser} parser Feature parser.
+ * @param {ol.parser.FeatureParser} parser Feature parser.
  * @param {ol.Projection} projection This sucks.  The layer should be a view in
  *     one projection.
  */
@@ -439,6 +439,9 @@ ol.layer.Vector.prototype.parseFeatures = function(data, parser, projection) {
 
   var addFeatures = function(features) {
     var sourceProjection = this.getSource().getProjection();
+    if (goog.isNull(sourceProjection)) {
+      sourceProjection = parser.getProjection();
+    }
     var transform = ol.proj.getTransform(sourceProjection, projection);
 
     transform(

src/ol/parser/featureparser.js

@@ -12,6 +12,20 @@ goog.require('ol.Feature');
 /**
  * @interface
  */
+ol.parser.FeatureParser = function() {};
+
+
+/**
+ * @return {ol.Projection} Data projection.
+ */
+ol.parser.FeatureParser.prototype.getProjection = goog.abstractMethod;
+
+
+
+/**
+ * @interface
+ * @extends {ol.parser.FeatureParser}
+ */
 ol.parser.DomFeatureParser = function() {};
 
 

src/ol/source/vectorsource.js

@@ -2,7 +2,6 @@ goog.provide('ol.source.Vector');
 
 goog.require('goog.asserts');
 goog.require('goog.net.XhrIo');
-goog.require('ol.proj');
 goog.require('ol.source.Source');
 
 
@@ -39,7 +38,7 @@ ol.source.Vector = function(options) {
 
   /**
    * @private
-   * @type {ol.parser.Parser}
+   * @type {ol.parser.FeatureParser}
    */
   this.parser_ = goog.isDef(options.parser) ? options.parser : null;
 
@@ -53,8 +52,7 @@ ol.source.Vector = function(options) {
     attributions: options.attributions,
     extent: options.extent,
     logo: options.logo,
-    projection: goog.isDef(options.projection) ?
+    projection: options.projection
-        options.projection : ol.proj.get('EPSG:4326')
   });
 };
 goog.inherits(ol.source.Vector, ol.source.Source);