Added monthly separator for output files

Author: blootsvoets

src/main/java/org/radarcns/hdfs/MonthlyObservationKeyPathFactory.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2018 The Hyve
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.radarcns.hdfs;
+
+import static java.time.ZoneOffset.UTC;
+
+import java.time.format.DateTimeFormatter;
+
+public class MonthlyObservationKeyPathFactory extends ObservationKeyPathFactory {
+    private static final DateTimeFormatter PER_MONTH_HOURLY_TIME_BIN_FORMAT = DateTimeFormatter.ofPattern("yyyyMM/yyyyMMdd_HH'00'")
+            .withZone(UTC);
+
+
+    public DateTimeFormatter getTimeBinFormat() {
+        return PER_MONTH_HOURLY_TIME_BIN_FORMAT;
+    }
+}