allow construct ResultTotalHeaderItem from total type only

Author: jimirocks

src/main/java/com/gooddata/executeafm/result/ResultTotalHeaderItem.java

@@ -24,6 +24,22 @@ public class ResultTotalHeaderItem extends ResultHeaderItem {
 
     private final String type;
 
+    /**
+     * Creates new instance of given total type, type is used for the name as well
+     * @param type total type
+     */
+    public ResultTotalHeaderItem(final String type) {
+        this(type, type);
+    }
+
+    /**
+     * Creates new instance of given total type, type is used for the name as well
+     * @param type total type
+     */
+    public ResultTotalHeaderItem(final Total type) {
+        this(notNull(type, "type").toString());
+    }
+
     /**
      * Creates new instance of given header name and total type
      * @param name header name

src/test/groovy/com/gooddata/executeafm/result/ResultTotalHeaderItemTest.groovy

@@ -32,4 +32,16 @@ class ResultTotalHeaderItemTest extends Specification {
         item.name == 'Some total'
         item.type == 'avg'
     }
+
+    def "should create from type only"() {
+        expect:
+        with(new ResultTotalHeaderItem('avg')) {
+            name == 'avg'
+            type == 'avg'
+        }
+        with(new ResultTotalHeaderItem(Total.SUM)) {
+            name == 'sum'
+            type == 'sum'
+        }
+    }
 }