--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.sql.compile.ColumnOrdering\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.sql.compile.RowOrdering;\r
+import org.apache.derby.iapi.sql.compile.Optimizable;\r
+\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+\r
+import java.util.Vector;\r
+\r
+class ColumnOrdering {\r
+\r
+ /* See RowOrdering for possible values */\r
+ int myDirection;\r
+\r
+ /* A vector of column numbers (Integers) */\r
+ Vector columns = new Vector();\r
+\r
+ /*\r
+ ** A vector of table numbers (Integers), corresponding to the column\r
+ ** vector by position.\r
+ */\r
+ Vector tables = new Vector();\r
+\r
+ /**\r
+ * @param direction See RowOrdering for possible values\r
+ */\r
+ ColumnOrdering(int direction) {\r
+ myDirection = direction;\r
+ }\r
+\r
+ /**\r
+ * Does this ColumnOrdering contain the given column in the given table\r
+ * in the right direction?\r
+ *\r
+ * @param direction See RowOrdering for possible values\r
+ * @param tableNumber The number of the table in question\r
+ * @param columnNumber The column number in the table (one-based)\r
+ *\r
+ * @return true if the column is found here in the right direction\r
+ */\r
+ boolean ordered(int direction, int tableNumber, int columnNumber) {\r
+ /*\r
+ ** Check the direction only if the direction isn't DONTCARE\r
+ */\r
+ if (direction != RowOrdering.DONTCARE) {\r
+ if (direction != myDirection)\r
+ return false;\r
+ }\r
+\r
+ /* The direction matches - see if the column is in this ordering */\r
+ return contains(tableNumber, columnNumber);\r
+ }\r
+\r
+ /**\r
+ * Does this ColumnOrdering contain the given column?\r
+ *\r
+ * @param tableNumber The number of table in question\r
+ * @param columnNumber The column number in the table (one-based)\r
+ *\r
+ * @return true if the column is found here in the right direction\r
+ */\r
+ boolean contains(int tableNumber, int columnNumber)\r
+ {\r
+ for (int i = 0; i < columns.size(); i++) {\r
+ Integer col = (Integer) columns.elementAt(i);\r
+ Integer tab = (Integer) tables.elementAt(i);\r
+\r
+ if (tab.intValue() == tableNumber &&\r
+ col.intValue() == columnNumber) {\r
+\r
+ return true;\r
+ }\r
+ }\r
+\r
+ return false;\r
+ }\r
+\r
+ /**\r
+ * Get the direction of this ColumnOrdering\r
+ */\r
+ int direction()\r
+ {\r
+ return myDirection;\r
+ }\r
+\r
+ /**\r
+ * Add a column in a table to this ColumnOrdering\r
+ *\r
+ * @param tableNumber The number of table in question\r
+ * @param columnNumber The column number in the table (one-based)\r
+ */\r
+ void addColumn(int tableNumber, int columnNumber)\r
+ {\r
+ tables.addElement(new Integer(tableNumber));\r
+ columns.addElement(new Integer(columnNumber));\r
+ }\r
+\r
+ /**\r
+ * Remove all columns with the given table number\r
+ */\r
+ void removeColumns(int tableNumber)\r
+ {\r
+ /*\r
+ ** Walk the list backwards, so we can remove elements\r
+ ** by position.\r
+ */\r
+ for (int i = tables.size() - 1; i >= 0; i--)\r
+ {\r
+ Integer tab = (Integer) tables.elementAt(i);\r
+ if (tab.intValue() == tableNumber)\r
+ {\r
+ tables.removeElementAt(i);\r
+ columns.removeElementAt(i);\r
+ }\r
+ }\r
+ }\r
+\r
+ /**\r
+ * Tell whether this ColumnOrdering has no elements.\r
+ */\r
+ boolean empty()\r
+ {\r
+ return (tables.size() == 0);\r
+ }\r
+\r
+ /** Return a clone of this ColumnOrdering */\r
+ ColumnOrdering cloneMe() {\r
+ ColumnOrdering retval = new ColumnOrdering(myDirection);\r
+\r
+ for (int i = 0; i < columns.size(); i++) {\r
+ /* Integers are immutable, so just copy the pointers */\r
+ retval.columns.addElement(columns.elementAt(i));\r
+ retval.tables.addElement(tables.elementAt(i));\r
+ }\r
+\r
+ return retval;\r
+ }\r
+\r
+ /** Is the given table number in this ColumnOrdering? */\r
+ boolean hasTable(int tableNumber) {\r
+ if (tables.size() == 0)\r
+ return false;\r
+\r
+ for (int i = 0; i < tables.size(); i++) {\r
+ Integer tab = (Integer) tables.elementAt(i);\r
+ \r
+ if (tab.intValue() == tableNumber)\r
+ return true;\r
+ }\r
+\r
+ return false;\r
+ }\r
+\r
+ /** Is there any table other than the given one in this ColumnOrdering? */\r
+ boolean hasAnyOtherTable(int tableNumber) {\r
+ if (tables.size() == 0)\r
+ return false;\r
+\r
+ for (int i = 0; i < tables.size(); i++) {\r
+ Integer tab = (Integer) tables.elementAt(i);\r
+ \r
+ if (tab.intValue() != tableNumber)\r
+ return true;\r
+ }\r
+\r
+ return false;\r
+ }\r
+\r
+ public String toString() {\r
+ String retval = "";\r
+\r
+ if (SanityManager.DEBUG) {\r
+ retval += "Direction: " + myDirection;\r
+\r
+ for (int i = 0; i < columns.size(); i++) {\r
+ retval += " Table " + tables.elementAt(i) +\r
+ ", Column " + columns.elementAt(i);\r
+ }\r
+ }\r
+\r
+ return retval;\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff