Read the metadata of a FeatureCollection

src/ol/format/gmlformat.js

@@ -146,9 +146,8 @@ ol.format.GML.FEATURE_COLLECTION_PARSERS = {
  * @param {Node} node Node.
  * @param {Array.<*>} objectStack Object stack.
  * @return {ol.geom.Geometry|undefined} Geometry.
- * @private
  */
-ol.format.GML.readGeometry_ = function(node, objectStack) {
+ol.format.GML.readGeometry = function(node, objectStack) {
   var context = objectStack[0];
   goog.asserts.assert(goog.isObject(context));
   goog.object.set(context, 'srsName',
@@ -188,7 +187,7 @@ ol.format.GML.readFeature_ = function(node, objectStack) {
       values[ol.xml.getLocalName(n)] = value;
     } else {
       geometryName = ol.xml.getLocalName(n);
-      values[geometryName] = ol.format.GML.readGeometry_(n, objectStack);
+      values[geometryName] = ol.format.GML.readGeometry(n, objectStack);
     }
   }
   var feature = new ol.Feature(values);
@@ -1016,7 +1015,7 @@ ol.format.GML.RING_PARSERS_ = {
  * @inheritDoc
  */
 ol.format.GML.prototype.readGeometryFromNode = function(node) {
-  var geometry = ol.format.GML.readGeometry_(node, [{}]);
+  var geometry = ol.format.GML.readGeometry(node, [{}]);
   return (goog.isDef(geometry)) ? geometry : null;
 };
 

src/ol/format/wfsformat.js

@@ -91,6 +91,72 @@ ol.format.WFS.prototype.readTransactionResponse = function(source) {
 };
 
 
+/**
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Object|undefined} FeatureCollection metadata.
+ */
+ol.format.WFS.prototype.readFeatureCollectionMetadata = function(source) {
+  if (ol.xml.isDocument(source)) {
+    return this.readFeatureCollectionMetadataFromDocument(
+        /** @type {Document} */ (source));
+  } else if (ol.xml.isNode(source)) {
+    return this.readFeatureCollectionMetadataFromNode(
+        /** @type {Node} */ (source));
+  } else if (goog.isString(source)) {
+    var doc = ol.xml.load(source);
+    return this.readFeatureCollectionMetadataFromDocument(doc);
+  } else {
+    goog.asserts.fail();
+    return null;
+  }
+};
+
+
+/**
+ * @param {Document} doc Document.
+ * @return {Object|undefined} FeatureCollection metadata.
+ */
+ol.format.WFS.prototype.readFeatureCollectionMetadataFromDocument =
+    function(doc) {
+  goog.asserts.assert(doc.nodeType == goog.dom.NodeType.DOCUMENT);
+  for (var n = doc.firstChild; !goog.isNull(n); n = n.nextSibling) {
+    if (n.nodeType == goog.dom.NodeType.ELEMENT) {
+      return this.readFeatureCollectionMetadataFromNode(n);
+    }
+  }
+  return null;
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, ol.xml.Parser>>}
+ * @private
+ */
+ol.format.WFS.FEATURE_COLLECTION_PARSERS_ = {
+  'http://www.opengis.net/gml': {
+    'boundedBy': ol.xml.makeObjectPropertySetter(
+        ol.format.GML.readGeometry, 'bounds')
+  }
+};
+
+
+/**
+ * @param {Node} node Node.
+ * @return {Object|undefined} FeatureCollection metadata.
+ */
+ol.format.WFS.prototype.readFeatureCollectionMetadataFromNode = function(node) {
+  goog.asserts.assert(node.nodeType == goog.dom.NodeType.ELEMENT);
+  goog.asserts.assert(node.localName == 'FeatureCollection');
+  var result = {};
+  var value = ol.format.XSD.readNonNegativeIntegerString(
+      node.getAttribute('numberOfFeatures'));
+  goog.object.set(result, 'numberOfFeatures', value);
+  return ol.xml.pushParseAndPop(
+      result, ol.format.WFS.FEATURE_COLLECTION_PARSERS_, node, []);
+};
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, ol.xml.Parser>>}

test/spec/ol/format/wfsformat.test.js

@@ -33,6 +33,43 @@ describe('ol.format.WFS', function() {
 
   });
 
+  describe('when parsing FeatureCollection', function() {
+    var response;
+    before(function(done) {
+      afterLoadText('spec/ol/format/wfs/NumberOfFeatures.xml',
+          function(xml) {
+            try {
+              response = new ol.format.WFS().readFeatureCollectionMetadata(xml);
+            } catch (e) {
+              done(e);
+            }
+            done();
+          });
+    });
+    it('returns the correct number of features', function() {
+      expect(response.numberOfFeatures).to.equal(625);
+    });
+  });
+
+  describe('when parsing FeatureCollection', function() {
+    var response;
+    before(function(done) {
+      afterLoadText('spec/ol/format/wfs/boundedBy.xml',
+          function(xml) {
+            try {
+              response = new ol.format.WFS().readFeatureCollectionMetadata(xml);
+            } catch (e) {
+              done(e);
+            }
+            done();
+          });
+    });
+    it('returns the correct bounds', function() {
+      expect(response.bounds).to.eql([3197.88, 306457.313,
+        280339.156, 613850.438]);
+    });
+  });
+
   describe('when parsing TransactionResponse', function() {
     var response;
     before(function(done) {