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 / ReferencedTablesVisitor.java

diff --git a/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/compile/ReferencedTablesVisitor.java b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/compile/ReferencedTablesVisitor.java
new file mode 100644 (file)
index 0000000..6cc2fda
--- /dev/null
+++ b/JMCR-Stable/real-world application/derby-10.3.2.1/java/engine/org/apache/derby/impl/sql/compile/ReferencedTablesVisitor.java
@@ -0,0 +1,107 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.impl.sql.compile.ReferencedTablesVisitor\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
+\r
+package        org.apache.derby.impl.sql.compile;\r
+\r
+import org.apache.derby.iapi.sql.compile.Visitable; \r
+import org.apache.derby.iapi.sql.compile.Visitor;\r
+\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.util.JBitSet;\r
+\r
+/**\r
+ * Build a JBitSet of all of the referenced tables in the tree.\r
+ *\r
+ */\r
+public class ReferencedTablesVisitor implements Visitor \r
+{\r
+       private JBitSet tableMap;\r
+\r
+       public ReferencedTablesVisitor(JBitSet tableMap)\r
+       {\r
+               this.tableMap = tableMap;\r
+       }\r
+\r
+\r
+       ////////////////////////////////////////////////\r
+       //\r
+       // VISITOR INTERFACE\r
+       //\r
+       ////////////////////////////////////////////////\r
+\r
+       /**\r
+        * Don't do anything unless we have a ColumnReference,\r
+        * Predicate or ResultSetNode node.\r
+        *\r
+        * @param node  the node to process\r
+        *\r
+        * @return me\r
+        *\r
+        * @exception StandardException on error\r
+        */\r
+       public Visitable visit(Visitable node)\r
+               throws StandardException\r
+       {\r
+               if (node instanceof ColumnReference)\r
+               {\r
+                       ((ColumnReference)node).getTablesReferenced(tableMap);\r
+               }\r
+               else if (node instanceof Predicate)\r
+               {\r
+                       Predicate pred = (Predicate) node;\r
+                       tableMap.or(pred.getReferencedSet());\r
+               }\r
+               else if (node instanceof ResultSetNode)\r
+               {\r
+                       ResultSetNode rs = (ResultSetNode) node;\r
+                       tableMap.or(rs.getReferencedTableMap());\r
+               }\r
+\r
+               return node;\r
+       }\r
+\r
+       /**\r
+        * No need to go below a Predicate or ResultSet.\r
+        *\r
+        * @return Whether or not to go below the node.\r
+        */\r
+       public boolean skipChildren(Visitable node)\r
+       {\r
+               return (node instanceof Predicate ||\r
+                           node instanceof ResultSetNode);\r
+       }\r
+\r
+       public boolean stopTraversal()\r
+       {\r
+               return false;\r
+       }\r
+       ////////////////////////////////////////////////\r
+       //\r
+       // CLASS INTERFACE\r
+       //\r
+       ////////////////////////////////////////////////\r
+       JBitSet getTableMap()\r
+       {\r
+               return tableMap;\r
+       }\r
+}      \r