Adding JMCR-Stable version

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

diff --git a/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/impl/sql/execute/MaxMinAggregator.java b/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/impl/sql/execute/MaxMinAggregator.java
new file mode 100644 (file)
index 0000000..72e1871
--- /dev/null
+++ b/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/impl/sql/execute/MaxMinAggregator.java
@@ -0,0 +1,115 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.impl.sql.execute.MaxMinAggregator\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.DataValueDescriptor;\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.sql.execute.ExecAggregator;\r
+import org.apache.derby.iapi.services.io.StoredFormatIds;\r
+import java.io.ObjectOutput;\r
+import java.io.ObjectInput;\r
+import java.io.IOException;\r
+\r
+/**\r
+ * Aggregator for MAX()/MIN().  Defers most of its work\r
+ * to OrderableAggregator.\r
+ *\r
+ * @see OrderableAggregator\r
+ *\r
+ */\r
+public final class MaxMinAggregator \r
+       extends OrderableAggregator\r
+{\r
+\r
+       private boolean isMax; // true for max, false for min\r
+\r
+       /**\r
+        */\r
+       public void setup(String aggregateName)\r
+       {\r
+               super.setup(aggregateName);\r
+               isMax = aggregateName.equals("MAX");\r
+       }\r
+       /**\r
+        * Accumulate\r
+        *\r
+        * @param addend        value to be added in\r
+        *\r
+        * @exception StandardException on error\r
+        *\r
+        */\r
+       protected void accumulate(DataValueDescriptor addend) \r
+               throws StandardException\r
+       {\r
+               if ( (value == null) ||\r
+                             (isMax && (value.compare(addend) < 0)) ||\r
+                                 (!isMax && (value.compare(addend) > 0))\r
+                                 )\r
+               {\r
+                       /* NOTE: We need to call getClone() since value gets\r
+                        * reused underneath us\r
+                        */\r
+                       value = addend.getClone();\r
+               }\r
+       }\r
+\r
+       /**\r
+        * @return ExecAggregator the new aggregator\r
+        */\r
+       public ExecAggregator newAggregator()\r
+       {\r
+               MaxMinAggregator ma = new MaxMinAggregator();\r
+               ma.isMax = isMax;\r
+               return ma;\r
+       }\r
+\r
+       /////////////////////////////////////////////////////////////\r
+       // \r
+       // FORMATABLE INTERFACE\r
+       // \r
+       /////////////////////////////////////////////////////////////\r
+       public void writeExternal(ObjectOutput out) throws IOException\r
+       {\r
+               super.writeExternal(out);\r
+               out.writeBoolean(isMax);\r
+       }\r
+\r
+       /** \r
+        * @see java.io.Externalizable#readExternal \r
+        *\r
+        * @exception IOException on error\r
+        * @exception ClassNotFoundException on error\r
+        */\r
+       public void readExternal(ObjectInput in) \r
+               throws IOException, ClassNotFoundException {\r
+               super.readExternal(in);\r
+               isMax = in.readBoolean();\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_MAX_MIN_V01_ID; }\r
+}\r