Merge pull request influxdata#562 from asashour/classInheritance

@column to support support super class inheritance

Author: majst01

CHANGELOG.md

@@ -8,6 +8,8 @@
   would be used [Issue #548](https://github.com/influxdata/influxdb-java/issues/548)
 - Add BatchPoints.Builder.points(Collection)
   [Issue #451](https://github.com/influxdata/influxdb-java/issues/451)
+- @Column supports class inheritance
+  [Issue #367](https://github.com/influxdata/influxdb-java/issues/367)
 
 ## 2.14 [2018-10-12]
 

src/main/java/org/influxdb/impl/InfluxDBResultMapper.java

@@ -217,11 +217,15 @@ void cacheMeasurementClass(final Class<?>... classVarAgrs) {
         influxColumnAndFieldMap = initialMap;
       }
 
-      for (Field field : clazz.getDeclaredFields()) {
-        Column colAnnotation = field.getAnnotation(Column.class);
-        if (colAnnotation != null) {
-          influxColumnAndFieldMap.put(colAnnotation.name(), field);
+      Class<?> c = clazz;
+      while (c != null) {
+        for (Field field : c.getDeclaredFields()) {
+          Column colAnnotation = field.getAnnotation(Column.class);
+          if (colAnnotation != null) {
+            influxColumnAndFieldMap.put(colAnnotation.name(), field);
+          }
         }
+        c = c.getSuperclass();
       }
     }
   }

src/test/java/org/influxdb/impl/InfluxDBResultMapperTest.java

@@ -409,6 +409,38 @@ void testToPOJO_SetMeasureName() {
 		Assertions.assertTrue(result.size() == 1);
 	}
 
+  @Test
+  void testToPOJOInheritance() {
+    // Given...
+    mapper.cacheMeasurementClass(MySubMeasurement.class);
+
+    String superValue = UUID.randomUUID().toString();
+    String subValue = "my sub value";
+    List<String> columnList = Arrays.asList("superValue", "subValue");
+
+    List<Object> firstSeriesResult = Arrays.asList(superValue, subValue);
+
+    QueryResult.Series series = new QueryResult.Series();
+    series.setName("MySeriesName");
+    series.setColumns(columnList);
+    series.setValues(Arrays.asList(firstSeriesResult));
+
+    QueryResult.Result internalResult = new QueryResult.Result();
+    internalResult.setSeries(Arrays.asList(series));
+
+    QueryResult queryResult = new QueryResult();
+    queryResult.setResults(Arrays.asList(internalResult));
+
+    //When...
+    List<MySubMeasurement> result =
+        mapper.toPOJO(queryResult, MySubMeasurement.class, "MySeriesName");
+
+    //Then...
+    Assertions.assertTrue(result.size() == 1);
+    Assertions.assertEquals(superValue, result.get(0).superValue);
+    Assertions.assertEquals(subValue, result.get(0).subValue);
+  }
+
 	@Measurement(name = "CustomMeasurement")
 	static class MyCustomMeasurement {
 
@@ -456,7 +488,31 @@ public String toString() {
 		}
 	}
 
-	@Measurement(name = "foo")
+  @Measurement(name = "SuperMeasurement")
+  static class MySuperMeasurement {
+
+    @Column(name = "superValue")
+    protected String superValue;
+
+    @Override
+    public String toString() {
+      return "SuperMeasurement [superValue=" + superValue + "]";
+    }
+  }
+
+  @Measurement(name = "SubMeasurement")
+  static class MySubMeasurement extends MySuperMeasurement {
+
+    @Column(name = "subValue")
+    protected String subValue;
+
+    @Override
+    public String toString() {
+      return "MySubMeasurement [subValue=" + subValue + ", superValue=" + superValue + "]";
+    }
+  }
+
+  @Measurement(name = "foo")
 	static class MyPojoWithUnsupportedField {
 
 		@Column(name = "bar")