Source Code Cross Referenced for AxionColumnsMetaTableUpdater.java in  » Database-DBMS » axion » org » axiondb » engine » metaupdaters » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb.engine.metaupdaters 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: AxionColumnsMetaTableUpdater.java,v 1.5 2005/12/20 18:32:57 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 2002-2005 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 java.sql.DatabaseMetaData;
044:        import java.util.Iterator;
045:
046:        import org.apache.commons.logging.Log;
047:        import org.apache.commons.logging.LogFactory;
048:        import org.axiondb.AxionCommand;
049:        import org.axiondb.AxionException;
050:        import org.axiondb.Column;
051:        import org.axiondb.ColumnIdentifier;
052:        import org.axiondb.Constraint;
053:        import org.axiondb.Database;
054:        import org.axiondb.Function;
055:        import org.axiondb.Literal;
056:        import org.axiondb.Row;
057:        import org.axiondb.Selectable;
058:        import org.axiondb.SelectableBasedConstraint;
059:        import org.axiondb.Table;
060:        import org.axiondb.TableIdentifier;
061:        import org.axiondb.constraints.NotNullConstraint;
062:        import org.axiondb.constraints.PrimaryKeyConstraint;
063:        import org.axiondb.engine.commands.DeleteCommand;
064:        import org.axiondb.engine.commands.UpdateCommand;
065:        import org.axiondb.engine.rows.SimpleRow;
066:        import org.axiondb.event.BaseDatabaseModificationListener;
067:        import org.axiondb.event.ColumnEvent;
068:        import org.axiondb.event.ConstraintEvent;
069:        import org.axiondb.event.DatabaseModificationListener;
070:        import org.axiondb.event.DatabaseModifiedEvent;
071:        import org.axiondb.event.RowEvent;
072:        import org.axiondb.event.TableModificationListener;
073:        import org.axiondb.functions.FunctionIdentifier;
074:        import org.axiondb.util.ValuePool;
075:
076:        /**
077:         * Updates the <code>AXION_TABLES</code> meta table
078:         * 
079:         * @version $Revision: 1.5 $ $Date: 2005/12/20 18:32:57 $
080:         * @author Chuck Burdick
081:         * @author Rodney Waldhoff
082:         * @author Ahimanikya Satapathy 
083:         */
084:        public class AxionColumnsMetaTableUpdater extends
085:                BaseDatabaseModificationListener implements 
086:                DatabaseModificationListener, TableModificationListener {
087:            private static Log _log = LogFactory
088:                    .getLog(AxionColumnsMetaTableUpdater.class);
089:            private Database _db = null;
090:
091:            public AxionColumnsMetaTableUpdater(Database db) {
092:                _db = db;
093:            }
094:
095:            public void tableAdded(DatabaseModifiedEvent e) {
096:                try {
097:                    for (int i = 0, I = e.getTable().getColumnCount(); i < I; i++) {
098:                        Column col = e.getTable().getColumn(i);
099:                        Row row = createRowForColumnAdded(e.getTable(), col);
100:                        _db.getTable("AXION_COLUMNS").addRow(row);
101:                    }
102:                } catch (AxionException ex) {
103:                    _log.error("Unable to mention table in system tables", ex);
104:                }
105:            }
106:
107:            public void tableDropped(DatabaseModifiedEvent e) {
108:                Function where = makeEqualFunction(new ColumnIdentifier(
109:                        "TABLE_NAME"), new Literal(e.getTable().getName()));
110:                AxionCommand cmd = new DeleteCommand("AXION_COLUMNS", where);
111:                try {
112:                    cmd.execute(_db);
113:                } catch (AxionException ex) {
114:                    _log
115:                            .error(
116:                                    "Unable to remove mention of table in system tables",
117:                                    ex);
118:                }
119:            }
120:
121:            //===================================== TableModificationListener Interface
122:
123:            public void columnAdded(ColumnEvent e) throws AxionException {
124:                Row row = createRowForColumnAdded(e.getTable(), e.getColumn());
125:                _db.getTable("AXION_COLUMNS").addRow(row);
126:            }
127:
128:            public void rowInserted(RowEvent event) throws AxionException {
129:            }
130:
131:            public void rowDeleted(RowEvent event) throws AxionException {
132:            }
133:
134:            public void rowUpdated(RowEvent event) throws AxionException {
135:            }
136:
137:            public void constraintAdded(ConstraintEvent event)
138:                    throws AxionException {
139:            }
140:
141:            public void constraintRemoved(ConstraintEvent event)
142:                    throws AxionException {
143:            }
144:
145:            public void updateNullableStatus(ConstraintEvent event,
146:                    boolean changeNullableTo) {
147:                Constraint c = event.getConstraint();
148:                if (c instanceof  NotNullConstraint
149:                        || c instanceof  PrimaryKeyConstraint) {
150:                    SelectableBasedConstraint nn = (SelectableBasedConstraint) c;
151:                    for (int i = 0; i < nn.getSelectableCount(); i++) {
152:                        try {
153:                            AxionCommand cmd = createUpdateNullableCmd(event
154:                                    .getTable(),
155:                                    nn.getSelectable(i).getLabel(),
156:                                    changeNullableTo);
157:                            cmd.execute(_db);
158:                        } catch (AxionException ex) {
159:                            _log
160:                                    .error(
161:                                            "Unable to mark nullable status in system tables",
162:                                            ex);
163:                        }
164:                    }
165:                }
166:            }
167:
168:            protected Row createRowForColumnAdded(Table t, Column col)
169:                    throws AxionException {
170:                boolean isnullable = isNullable(t, col.getName());
171:                Integer nullableInt = ValuePool
172:                        .getInt(isnullable ? DatabaseMetaData.columnNullable
173:                                : DatabaseMetaData.columnNoNulls);
174:                String nullableString = isnullable ? "YES" : "NO";
175:
176:                Short typeVal = new Short((short) col.getDataType()
177:                        .getJdbcType());
178:                Integer size = ValuePool.getInt(col.getDataType()
179:                        .getPrecision());
180:                Integer scale = ValuePool.getInt(col.getDataType().getScale());
181:                ;
182:                Integer radix = ValuePool.getInt(col.getDataType()
183:                        .getPrecisionRadix());
184:
185:                String typeName = col.getDataType().getClass().getName();
186:                String sqlType = col.getSqlType();
187:                if (sqlType == null) {
188:                    sqlType = typeName;
189:                } else {
190:                    sqlType = sqlType.toUpperCase();
191:                }
192:                int ord = t.getColumnIndex(col.getName());
193:
194:                SimpleRow row = new SimpleRow(22);
195:                row.set(0, ""); // table_cat
196:                row.set(1, ""); // table schem
197:                row.set(2, t.getName()); // table_name
198:                row.set(3, col.getName().toUpperCase()); // column_name
199:                row.set(4, typeVal); // data_type
200:                row.set(5, sqlType); // type_name
201:                row.set(6, size); // column_size
202:                row.set(7, null); // buffer_length (unused)
203:                row.set(8, scale); // decimal_digits
204:                row.set(9, radix); // num_prec_radix
205:                row.set(10, nullableInt); // nullable
206:                row.set(11, null); // remarks
207:                row.set(12, null); // column_def
208:                row.set(13, null); // sql_data_type (unused)
209:                row.set(14, null); // sql_datetime_sub (unused)
210:                row.set(15, null); // char_octet_length
211:                row.set(16, ValuePool.getInt(ord + 1)); // ordinal_position
212:                row.set(17, nullableString); // is_nullable
213:                row.set(18, null); // scope_catalog
214:                row.set(19, null); // scope_schema
215:                row.set(20, null); // scope_table
216:                row.set(21, null); // source_data_type
217:                return row;
218:            }
219:
220:            private UpdateCommand createUpdateNullableCmd(Table t,
221:                    String colName, boolean isnullable) {
222:                Integer nullableInt = ValuePool
223:                        .getInt(isnullable ? DatabaseMetaData.columnNullable
224:                                : DatabaseMetaData.columnNoNulls);
225:                String nullableString = isnullable ? "YES" : "NO";
226:
227:                Selectable tableMatch = makeEqualFunction(new ColumnIdentifier(
228:                        "TABLE_NAME"), new Literal(t.getName()));
229:
230:                Selectable colMatch = makeEqualFunction(new ColumnIdentifier(
231:                        "COLUMN_NAME"), new Literal(colName.toUpperCase()));
232:
233:                FunctionIdentifier where = new FunctionIdentifier("and");
234:                where.addArgument(tableMatch);
235:                where.addArgument(colMatch);
236:
237:                UpdateCommand cmd = new UpdateCommand();
238:                cmd.setTable(new TableIdentifier("AXION_COLUMNS"));
239:                cmd.addColumn(new ColumnIdentifier("NULLABLE"));
240:                cmd.addValue(new Literal(nullableInt));
241:                cmd.addColumn(new ColumnIdentifier("IS_NULLABLE"));
242:                cmd.addValue(new Literal(nullableString));
243:                cmd.setWhere(where);
244:                return cmd;
245:            }
246:
247:            private boolean isNullable(Table table, String column) {
248:                // FIXME: this is a little hack       
249:                for (Iterator iter = table.getConstraints(); iter.hasNext();) {
250:                    Constraint c = (Constraint) iter.next();
251:                    if (c instanceof  NotNullConstraint
252:                            || c instanceof  PrimaryKeyConstraint) {
253:                        SelectableBasedConstraint nn = (SelectableBasedConstraint) c;
254:                        for (int i = 0; i < nn.getSelectableCount(); i++) {
255:                            if (column.equals(nn.getSelectable(i).getLabel())) {
256:                                return false;
257:                            }
258:                        }
259:                    }
260:                }
261:                return true;
262:            }
263:
264:            private FunctionIdentifier makeEqualFunction(Selectable left,
265:                    Selectable right) {
266:                FunctionIdentifier function = new FunctionIdentifier("=");
267:                function.addArgument(left);
268:                function.addArgument(right);
269:                return function;
270:            }
271:        }
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