[GitHub] [incubator-iotdb] qiaojialin commented on a change in pull request #285: Add micro and nano timestamp precision

[GitBox <gi...@apache.org>]

qiaojialin commented on a change in pull request #285: Add micro and nano timestamp precision
URL: https://github.com/apache/incubator-iotdb/pull/285#discussion_r306099714
 
 

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 File path: iotdb/src/main/java/org/apache/iotdb/db/conf/IoTDBConfigCheck.java
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 @@ -0,0 +1,93 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.iotdb.db.conf;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Properties;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class IoTDBConfigCheck {
+
+  // this file is located in Data/System/Schema/system_properties.
+  // If user delete folder "Data", system_properties can reset.
+  public static final String DEFAULT_FILEPATH = "system.properties";
+  public static final String PROPERTY_HOME =
+      "data" + File.separator + "system" + File.separator + "schema";
+  private static final IoTDBConfigCheck INSTANCE = new IoTDBConfigCheck();
+  private static final Logger logger = LoggerFactory.getLogger(IoTDBDescriptor.class);
+  private Properties properties = new Properties();
+  // this is a initial parameter.
+  public static String TIMESTAMP_PRECISION = "ms";
 
 Review comment:
   Just use a local variable is good

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