001: /*
002: * $Id: AxionTablesMetaTableUpdater.java,v 1.1 2004/08/13 02:01:13 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2002 Axion Development Team. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above
011: * copyright notice, this list of conditions and the following
012: * disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The names "Tigris", "Axion", nor the names of its contributors may
020: * not be used to endorse or promote products derived from this
021: * software without specific prior written permission.
022: *
023: * 4. Products derived from this software may not be called "Axion", nor
024: * may "Tigris" or "Axion" appear in their names without specific prior
025: * written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038: * =======================================================================
039: */
040:
041: package org.axiondb.engine.metaupdaters;
042:
043: import org.apache.commons.logging.Log;
044: import org.apache.commons.logging.LogFactory;
045: import org.axiondb.AxionCommand;
046: import org.axiondb.AxionException;
047: import org.axiondb.ColumnIdentifier;
048: import org.axiondb.Database;
049: import org.axiondb.Literal;
050: import org.axiondb.Row;
051: import org.axiondb.Table;
052: import org.axiondb.engine.commands.DeleteCommand;
053: import org.axiondb.engine.rows.SimpleRow;
054: import org.axiondb.event.BaseDatabaseModificationListener;
055: import org.axiondb.event.DatabaseModificationListener;
056: import org.axiondb.event.DatabaseModifiedEvent;
057: import org.axiondb.functions.FunctionIdentifier;
058:
059: /**
060: * Updates the <code>AXION_TABLES</code> meta table
061: *
062: * @version $Revision: 1.1 $ $Date: 2004/08/13 02:01:13 $
063: * @author Chuck Burdick
064: * @author Rodney Waldhoff
065: */
066: public class AxionTablesMetaTableUpdater extends
067: BaseDatabaseModificationListener implements
068: DatabaseModificationListener {
069: private static Log _log = LogFactory
070: .getLog(AxionTablesMetaTableUpdater.class);
071: private Database _db = null;
072:
073: public AxionTablesMetaTableUpdater(Database db) {
074: _db = db;
075: }
076:
077: public void tableAdded(DatabaseModifiedEvent e) {
078: Row row = createRowForAddedTable(e.getTable());
079: try {
080: _db.getTable("AXION_TABLES").addRow(row);
081: } catch (AxionException ex) {
082: _log.error("Unable to mention table in system tables", ex);
083: }
084: }
085:
086: public void tableDropped(DatabaseModifiedEvent e) {
087: FunctionIdentifier fn = new FunctionIdentifier("=");
088: fn.addArgument(new ColumnIdentifier("TABLE_NAME"));
089: fn.addArgument(new Literal(e.getTable().getName()));
090: AxionCommand cmd = new DeleteCommand("AXION_TABLES", fn);
091: try {
092: cmd.execute(_db);
093: } catch (AxionException ex) {
094: _log
095: .error(
096: "Unable to remove mention of table in system tables",
097: ex);
098: }
099: }
100:
101: public Row createRowForAddedTable(Table table) {
102: String tableName = table.getName();
103: String tableType = table.getType();
104: SimpleRow row = new SimpleRow(5);
105: row.set(0, ""); // table_cat
106: row.set(1, ""); // table_schem
107: row.set(2, tableName); // table_name
108: row.set(3, tableType); // table_type
109: row.set(4, null); // remarks
110: return row;
111: }
112: }
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