Better interface for passing projection and other metadata

src/ol/layer/vectorlayer.js

@@ -437,10 +437,10 @@ ol.layer.Vector.prototype.parseFeatures = function(data, parser, projection) {
     return lookup[type];
   };
 
-  var addFeatures = function(features) {
+  var addFeatures = function(features, metadata) {
     var sourceProjection = this.getSource().getProjection();
     if (goog.isNull(sourceProjection)) {
-      sourceProjection = parser.getProjection();
+      sourceProjection = metadata.projection;
     }
     var transform = ol.proj.getTransform(sourceProjection, projection);
 
@@ -468,20 +468,22 @@ ol.layer.Vector.prototype.parseFeatures = function(data, parser, projection) {
       parser.readFeaturesFromStringAsync(data, goog.bind(addFeatures, this),
           options);
     } else {
-      goog.asserts.assert(goog.isFunction(parser.readFeaturesFromString),
-          'Expected a parser with readFeaturesFromString method.');
-      features = parser.readFeaturesFromString(data, options);
-      addFeatures.call(this, features);
+      goog.asserts.assert(
+          goog.isFunction(parser.readFeaturesWithMetadataFromString),
+          'Expected parser with a readFeaturesWithMetadataFromString method.');
+      result = parser.readFeaturesWithMetadataFromString(data, options);
+      addFeatures.call(this, result.features, result.metadata);
     }
   } else if (goog.isObject(data)) {
     if (goog.isFunction(parser.readFeaturesFromObjectAsync)) {
       parser.readFeaturesFromObjectAsync(data, goog.bind(addFeatures, this),
           options);
     } else {
-      goog.asserts.assert(goog.isFunction(parser.readFeaturesFromObject),
-          'Expected a parser with a readFeaturesFromObject method.');
-      features = parser.readFeaturesFromObject(data, options);
-      addFeatures.call(this, features);
+      goog.asserts.assert(
+          goog.isFunction(parser.readFeaturesWithMetadataFromObject),
+          'Expected parser with a readFeaturesWithMetadataFromObject method.');
+      result = parser.readFeaturesWithMetadataFromObject(data, options);
+      addFeatures.call(this, result.features, result.metadata);
     }
   } else {
     // TODO: parse more data types

src/ol/parser/featureparser.js

@@ -8,23 +8,22 @@ goog.provide('ol.parser.StringFeatureParser');
 goog.require('ol.Feature');
 
 
-
 /**
- * @interface
+ * @typedef {{projection: ol.Projection}}
  */
-ol.parser.FeatureParser = function() {};
+ol.parser.ReadFeaturesMetadata;
 
 
 /**
- * @return {ol.Projection} Data projection.
+ * @typedef {{features: Array.<ol.Feature>,
+ *     metadata: ol.parser.ReadFeaturesMetadata}}
  */
-ol.parser.FeatureParser.prototype.getProjection = goog.abstractMethod;
+ol.parser.ReadFeaturesResult;
 
 
 
 /**
  * @interface
- * @extends {ol.parser.FeatureParser}
  */
 ol.parser.DomFeatureParser = function() {};
 
@@ -32,9 +31,9 @@ ol.parser.DomFeatureParser = function() {};
 /**
  * @param {Element|Document} node Document or element node.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Feature reading options.
- * @return {Array.<ol.Feature>} Array of features.
+ * @return {ol.parser.ReadFeaturesResult} Features and metadata.
  */
-ol.parser.DomFeatureParser.prototype.readFeaturesFromNode =
+ol.parser.DomFeatureParser.prototype.readFeaturesWithMetadataFromNode =
     goog.abstractMethod;
 
 
@@ -48,9 +47,9 @@ ol.parser.ObjectFeatureParser = function() {};
 /**
  * @param {Object} obj Object representing features.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Feature reading options.
- * @return {Array.<ol.Feature>} Array of features.
+ * @return {ol.parser.ReadFeaturesResult} Features and metadata.
  */
-ol.parser.ObjectFeatureParser.prototype.readFeaturesFromObject =
+ol.parser.ObjectFeatureParser.prototype.readFeaturesWithMetadataFromObject =
     goog.abstractMethod;
 
 
@@ -64,9 +63,9 @@ ol.parser.StringFeatureParser = function() {};
 /**
  * @param {string} data String data.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Feature reading options.
- * @return {Array.<ol.Feature>} Array of features.
+ * @return {ol.parser.ReadFeaturesResult} Features and metadata.
  */
-ol.parser.StringFeatureParser.prototype.readFeaturesFromString =
+ol.parser.StringFeatureParser.prototype.readFeaturesWithMetadataFromString =
     goog.abstractMethod;
 
 
@@ -79,7 +78,8 @@ ol.parser.AsyncStringFeatureParser = function() {};
 
 /**
  * @param {string} data String data.
- * @param {function(Array.<ol.Feature>)} callback Callback which is called
+ * @param {function(Array.<ol.Feature>, ol.parser.ReadFeaturesMetadata)}
+ *        callback Callback which is called
  * after parsing.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Feature reading options.
  */
@@ -96,7 +96,8 @@ ol.parser.AsyncObjectFeatureParser = function() {};
 
 /**
  * @param {Object} obj Object representing features.
- * @param {function(Array.<ol.Feature>)} callback Callback which is called
+ * @param {function(Array.<ol.Feature>), ol.parser.ReadFeaturesMetadata}
+ *     callback Callback which is called
  * after parsing.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Feature reading options.
  */