Getters for comparison expression properties

src/ol/expression/expressions.js

@@ -213,6 +213,33 @@ ol.expression.Comparison.prototype.evaluate = function(opt_scope, opt_this,
 };
 
 
+/**
+ * Get the comparison operator.
+ * @return {string} The comparison operator.
+ */
+ol.expression.Comparison.prototype.getOperator = function() {
+  return this.operator_;
+};
+
+
+/**
+ * Get the left expression.
+ * @return {ol.expression.Expression} The left expression.
+ */
+ol.expression.Comparison.prototype.getLeft = function() {
+  return this.left_;
+};
+
+
+/**
+ * Get the right expression.
+ * @return {ol.expression.Expression} The right expression.
+ */
+ol.expression.Comparison.prototype.getRight = function() {
+  return this.right_;
+};
+
+
 
 /**
  * An identifier expression (e.g. `foo`).

test/spec/ol/expression/expressions.test.js

@@ -211,6 +211,29 @@ describe('ol.expression.Comparison', function() {
     });
   });
 
+  var op = ol.expression.ComparisonOp.LTE;
+  var left = new ol.expression.Identifier('foo');
+  var right = new ol.expression.Literal(42);
+  var expr = new ol.expression.Comparison(op, left, right);
+
+  describe('#getOperator()', function() {
+    it('gets the operator', function() {
+      expect(expr.getOperator()).to.be(op);
+    });
+  });
+
+  describe('#getLeft()', function() {
+    it('gets the left expression', function() {
+      expect(expr.getLeft()).to.be(left);
+    });
+  });
+
+  describe('#getRight()', function() {
+    it('gets the right expression', function() {
+      expect(expr.getRight()).to.be(right);
+    });
+  });
+
 });
 
 describe('ol.expression.Identifier', function() {