Adding JMCR-Stable version

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

diff --git a/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/compile/OrderByNode.java b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/compile/OrderByNode.java
new file mode 100644 (file)
index 0000000..9c4a0ff
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+++ b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/compile/OrderByNode.java
@@ -0,0 +1,131 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.impl.sql.compile.OrderByNode\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.compile;\r
+\r
+import org.apache.derby.iapi.error.StandardException;\r
+import org.apache.derby.iapi.services.compiler.MethodBuilder;\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+import org.apache.derby.iapi.sql.ResultColumnDescriptor;\r
+\r
+/**\r
+ * An OrderByNode represents a result set for a sort operation\r
+ * for an order by list.  It is expected to only be generated at \r
+ * the end of optimization, once we have determined that a sort\r
+ * is required.\r
+ *\r
+ */\r
+public class OrderByNode extends SingleChildResultSetNode\r
+{\r
+\r
+       OrderByList             orderByList;\r
+\r
+       /**\r
+        * Initializer for a OrderByNode.\r
+        *\r
+        * @param childResult   The child ResultSetNode\r
+        * @param orderByList   The order by list.\r
+        * @param tableProperties       Properties list associated with the table\r
+    *\r
+        * @exception StandardException         Thrown on error\r
+        */\r
+       public void init(\r
+                                               Object childResult,\r
+                                               Object orderByList,\r
+                                               Object tableProperties)\r
+               throws StandardException\r
+       {\r
+               ResultSetNode child = (ResultSetNode) childResult;\r
+\r
+               super.init(childResult, tableProperties);\r
+\r
+               this.orderByList = (OrderByList) orderByList;\r
+\r
+               ResultColumnList prRCList;\r
+\r
+               /*\r
+                       We want our own resultColumns, which are virtual columns\r
+                       pointing to the child result's columns.\r
+\r
+                       We have to have the original object in the distinct node,\r
+                       and give the underlying project the copy.\r
+                */\r
+\r
+               /* We get a shallow copy of the ResultColumnList and its \r
+                * ResultColumns.  (Copy maintains ResultColumn.expression for now.)\r
+                */\r
+               prRCList = child.getResultColumns().copyListAndObjects();\r
+               resultColumns = child.getResultColumns();\r
+               child.setResultColumns(prRCList);\r
+\r
+               /* Replace ResultColumn.expression with new VirtualColumnNodes\r
+                * in the DistinctNode's RCL.  (VirtualColumnNodes include\r
+                * pointers to source ResultSetNode, this, and source ResultColumn.)\r
+                */\r
+               resultColumns.genVirtualColumnNodes(this, prRCList);\r
+       }\r
+\r
+       /**\r
+        * Convert this object to a String.  See comments in QueryTreeNode.java\r
+        * for how this should be done for tree printing.\r
+        *\r
+        * @return      This object as a String\r
+        */\r
+\r
+       public String toString()\r
+       {\r
+               if (SanityManager.DEBUG)\r
+               {\r
+                       return childResult.toString() + "\n" + \r
+                               "orderByList: " + \r
+                               (orderByList != null ? orderByList.toString() : "null") + "\n" +\r
+                               super.toString();\r
+               }\r
+               else\r
+               {\r
+                       return "";\r
+               }\r
+       }\r
+\r
+       ResultColumnDescriptor[] makeResultDescriptors()\r
+       {\r
+           return childResult.makeResultDescriptors();\r
+       }\r
+\r
+    /**\r
+     * generate the distinct result set operating over the source\r
+        * resultset.\r
+     *\r
+        * @exception StandardException         Thrown on error\r
+     */\r
+       public void generate(ActivationClassBuilder acb,\r
+                                                               MethodBuilder mb)\r
+                                                       throws StandardException\r
+       {\r
+               // Get the cost estimate for the child\r
+               if (costEstimate == null)\r
+               {\r
+                       costEstimate = childResult.getFinalCostEstimate();\r
+               }\r
+\r
+           orderByList.generate(acb, mb, childResult);\r
+       }\r
+}\r