From 7a51b4c7b6ca24a9fe0797bc4eb9846da899ef1e Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Mon, 10 Mar 2014 16:18:12 +0100
Subject: [PATCH] Add ol.geom.MultiLineString#appendLineString

---
 src/ol/geom/multilinestring.exports       |  1 +
 src/ol/geom/multilinestring.js            | 16 ++++++++++++++++
 test/spec/ol/geom/multilinestring.test.js | 11 +++++++++++
 3 files changed, 28 insertions(+)

diff --git a/src/ol/geom/multilinestring.exports b/src/ol/geom/multilinestring.exports
index aa3eb024a0..9390428f2a 100644
--- a/src/ol/geom/multilinestring.exports
+++ b/src/ol/geom/multilinestring.exports
@@ -1,4 +1,5 @@
 @exportSymbol ol.geom.MultiLineString
+@exportProperty ol.geom.MultiLineString.prototype.appendLineString
 @exportProperty ol.geom.MultiLineString.prototype.clone
 @exportProperty ol.geom.MultiLineString.prototype.getCoordinateAtM
 @exportProperty ol.geom.MultiLineString.prototype.getCoordinates
diff --git a/src/ol/geom/multilinestring.js b/src/ol/geom/multilinestring.js
index 4c825db9a3..816abef889 100644
--- a/src/ol/geom/multilinestring.js
+++ b/src/ol/geom/multilinestring.js
@@ -47,6 +47,22 @@ ol.geom.MultiLineString = function(coordinates, opt_layout) {
 goog.inherits(ol.geom.MultiLineString, ol.geom.SimpleGeometry);
 
 
+/**
+ * @param {ol.geom.LineString} lineString LineString.
+ */
+ol.geom.MultiLineString.prototype.appendLineString = function(lineString) {
+  goog.asserts.assert(lineString.getLayout() == this.layout);
+  if (goog.isNull(this.flatCoordinates)) {
+    this.flatCoordinates = lineString.getFlatCoordinates().slice();
+  } else {
+    goog.array.extend(
+        this.flatCoordinates, lineString.getFlatCoordinates().slice());
+  }
+  this.ends_.push(this.flatCoordinates.length);
+  this.dispatchChangeEvent();
+};
+
+
 /**
  * @inheritDoc
  */
diff --git a/test/spec/ol/geom/multilinestring.test.js b/test/spec/ol/geom/multilinestring.test.js
index cfa2a2c853..76d18f9ec1 100644
--- a/test/spec/ol/geom/multilinestring.test.js
+++ b/test/spec/ol/geom/multilinestring.test.js
@@ -37,6 +37,17 @@ describe('ol.geom.MultiLineString', function() {
       expect(multiLineString.getStride()).to.be(2);
     });
 
+    it('can append line strings', function() {
+      multiLineString.appendLineString(
+          new ol.geom.LineString([[1, 2], [3, 4]]));
+      expect(multiLineString.getCoordinates()).to.eql(
+          [[[1, 2], [3, 4]]]);
+      multiLineString.appendLineString(
+          new ol.geom.LineString([[5, 6], [7, 8]]));
+      expect(multiLineString.getCoordinates()).to.eql(
+          [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]);
+    });
+
   });
 
   describe('construct with 2D coordinates', function() {