Adding JMCR-Stable version

[Benchmarks_CSolver.git] / JMCR-Stable / real-world application / MyDerby-10.3 / java / engine / org / apache / derby / impl / sql / execute / CurrentDatetime.java

diff --git a/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/impl/sql/execute/CurrentDatetime.java b/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/impl/sql/execute/CurrentDatetime.java
new file mode 100644 (file)
index 0000000..affc1e1
--- /dev/null
+++ b/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/impl/sql/execute/CurrentDatetime.java
@@ -0,0 +1,114 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.impl.sql.execute.CurrentDatetime\r
+\r
+   Licensed to the Apache Software Foundation (ASF) under one or more\r
+   contributor license agreements.  See the NOTICE file distributed with\r
+   this work for additional information regarding copyright ownership.\r
+   The ASF licenses this file to you under the Apache License, Version 2.0\r
+   (the "License"); you may not use this file except in compliance with\r
+   the License.  You may obtain a copy of the License at\r
+\r
+      http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+   Unless required by applicable law or agreed to in writing, software\r
+   distributed under the License is distributed on an "AS IS" BASIS,\r
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+   See the License for the specific language governing permissions and\r
+   limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.sql.execute;\r
+\r
+/* can't import due to name overlap:\r
+import java.util.Date;\r
+*/\r
+import java.sql.Date;\r
+import java.sql.Time;\r
+import java.sql.Timestamp;\r
+\r
+/**\r
+       CurrentDatetime provides execution support for ensuring\r
+       that the current datetime is evaluated only once for a\r
+       statement. The same value is returned for every\r
+       CURRENT_DATE, CURRENT_TIME, and CURRENT_TIMESTAMP in the\r
+       statement.\r
+       <p>\r
+       This is expected to be used by an activation and its\r
+       result set, and so 'forget' must be called whenever you\r
+       want to reuse the CurrentDatetime object for additional\r
+       executions of the statement.\r
+\r
+ */\r
+public class CurrentDatetime {\r
+\r
+       /**\r
+               Holds the current datetime on the first evaluation of a current function\r
+               in a statement, which contains all available fields.\r
+        */\r
+       private java.util.Date currentDatetime;\r
+       /**\r
+               Holds the SQL DATE version of the current datetime.\r
+        */\r
+       private Date currentDate;\r
+       /**\r
+               Holds the SQL TIME version of the current datetime.\r
+        */\r
+       private Time currentTime;\r
+       /**\r
+               Holds the SQL TIMESTAMP version of the current datetime.\r
+        */\r
+       private Timestamp currentTimestamp;\r
+\r
+       /**\r
+               The constructor is public; note we wait until evaluation to\r
+               put any values into the fields.\r
+        */\r
+       public CurrentDatetime() {\r
+       }\r
+\r
+       // class implementation\r
+       final private void setCurrentDatetime() {\r
+               if (currentDatetime == null)\r
+                       currentDatetime = new java.util.Date();\r
+       }\r
+\r
+       // class interface\r
+\r
+       public Date getCurrentDate() {\r
+               if (currentDate == null) {\r
+                       setCurrentDatetime();\r
+                       currentDate = new Date(currentDatetime.getTime());\r
+               }\r
+               return currentDate;\r
+       }\r
+\r
+       public Time getCurrentTime() {\r
+               if (currentTime == null) {\r
+                       setCurrentDatetime();\r
+                       currentTime = new Time(currentDatetime.getTime());\r
+               }\r
+               return currentTime;\r
+       }\r
+\r
+       public Timestamp getCurrentTimestamp() {\r
+               if (currentTimestamp == null) {\r
+                       setCurrentDatetime();\r
+                       currentTimestamp = new Timestamp(currentDatetime.getTime());\r
+               }\r
+               return currentTimestamp;\r
+       }\r
+\r
+       /**\r
+               This is called prior to each execution of the statement, to\r
+               ensure that it starts over with a new current datetime value.\r
+        */\r
+       public void forget() {\r
+               currentDatetime = null;\r
+               currentDate = null;\r
+               currentTime = null;\r
+               currentTimestamp = null;\r
+       }\r
+\r
+}\r