Adding JMCR-Stable version

[Benchmarks_CSolver.git] / JMCR-Stable / real-world application / derby-10.3.2.1 / java / engine / org / apache / derby / impl / sql / execute / SumAggregator.java

diff --git a/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/execute/SumAggregator.java b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/execute/SumAggregator.java
new file mode 100644 (file)
index 0000000..4256f1b
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+++ b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/execute/SumAggregator.java
@@ -0,0 +1,95 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.impl.sql.execute.SumAggregator\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
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+import org.apache.derby.iapi.types.NumberDataValue;\r
+import org.apache.derby.iapi.error.StandardException;\r
+import org.apache.derby.iapi.sql.execute.ExecAggregator;\r
+import org.apache.derby.iapi.types.DataValueDescriptor;\r
+\r
+import org.apache.derby.iapi.services.io.StoredFormatIds;\r
+\r
+/**\r
+ * Aggregator for SUM().  Defers most of its work\r
+ * to OrderableAggregator.\r
+ *\r
+ */\r
+public  class SumAggregator \r
+       extends OrderableAggregator\r
+{\r
+       /**\r
+        * Accumulate\r
+        *\r
+        * @param addend        value to be added in\r
+        *\r
+        * @exception StandardException on error\r
+        *\r
+        * @see ExecAggregator#accumulate\r
+        */\r
+       protected void accumulate(DataValueDescriptor addend) \r
+               throws StandardException\r
+       {\r
+\r
+               /*\r
+               ** If we don't have any value yet, just clone\r
+               ** the addend.\r
+               */\r
+               if (value == null)\r
+               { \r
+                       /* NOTE: We need to call getClone() since value gets \r
+                        * reused underneath us\r
+                        */\r
+                       value = addend.getClone();\r
+               }\r
+               else\r
+               {\r
+                       NumberDataValue input = (NumberDataValue)addend;\r
+                       NumberDataValue nv = (NumberDataValue) value;\r
+\r
+                       value = nv.plus(\r
+                                               input,                                          // addend 1\r
+                                               nv,             // addend 2\r
+                                               nv);    // result\r
+               }\r
+       }\r
+\r
+       /**\r
+        * @return ExecAggregator the new aggregator\r
+        */\r
+       public ExecAggregator newAggregator()\r
+       {\r
+               return new SumAggregator();\r
+       }\r
+\r
+       ////////////////////////////////////////////////////////////\r
+       // \r
+       // FORMATABLE INTERFACE\r
+       // \r
+       /////////////////////////////////////////////////////////////\r
+       /**\r
+        * Get the formatID which corresponds to this class.\r
+        *\r
+        *      @return the formatID of this class\r
+        */\r
+       public  int     getTypeFormatId()       { return StoredFormatIds.AGG_SUM_V01_ID; }\r
+}\r