Source Code Cross Referenced for ExternalAxionDBTable.java in  » Database-DBMS » axion » org » axiondb » engine » tables » 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.tables 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: ExternalAxionDBTable.java,v 1.3 2005/12/20 18:32:28 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 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:        package org.axiondb.engine.tables;
041:
042:        import java.io.File;
043:        import java.util.ArrayList;
044:        import java.util.HashSet;
045:        import java.util.Iterator;
046:        import java.util.List;
047:        import java.util.Properties;
048:        import java.util.Set;
049:
050:        import org.apache.commons.collections.primitives.IntCollection;
051:        import org.apache.commons.logging.Log;
052:        import org.apache.commons.logging.LogFactory;
053:        import org.axiondb.AxionException;
054:        import org.axiondb.Column;
055:        import org.axiondb.ColumnIdentifier;
056:        import org.axiondb.Constraint;
057:        import org.axiondb.Database;
058:        import org.axiondb.DatabaseLink;
059:        import org.axiondb.ExternalTable;
060:        import org.axiondb.Index;
061:        import org.axiondb.Row;
062:        import org.axiondb.RowCollection;
063:        import org.axiondb.RowDecorator;
064:        import org.axiondb.RowIterator;
065:        import org.axiondb.RowSource;
066:        import org.axiondb.Selectable;
067:        import org.axiondb.Sequence;
068:        import org.axiondb.Table;
069:        import org.axiondb.TransactableTable;
070:        import org.axiondb.engine.Databases;
071:        import org.axiondb.engine.TransactableTableImpl;
072:        import org.axiondb.event.BaseTableModificationPublisher;
073:        import org.axiondb.event.ColumnEvent;
074:        import org.axiondb.jdbc.ConnectionFactory;
075:
076:        /**
077:         * Axion external table implementation of ExternalTable interface.
078:         * 
079:         * @version $Revision: 1.3 $ $Date: 2005/12/20 18:32:28 $
080:         * @author Ahimanikya Satapathy
081:         * @see org.axiondb.DatabaseLink
082:         * @see org.axiondb.engine.tables.ExternalDatabaseTable
083:         */
084:        public class ExternalAxionDBTable extends
085:                BaseTableModificationPublisher implements  ExternalTable {
086:
087:            private static Log _log = LogFactory
088:                    .getLog(ExternalAxionDBTable.class);
089:
090:            /** Set of recognized keys for organization properties */
091:            private static final Set PROPERTY_KEYS = new HashSet(6);
092:
093:            /** Set of required keys for organization properties */
094:            private static final Set REQUIRED_KEYS = new HashSet(1);
095:
096:            static {
097:                // Build set of recognized property keys for external db tables.
098:                PROPERTY_KEYS.add(PROP_DB);
099:                PROPERTY_KEYS.add(PROP_REMOTETABLE);
100:                PROPERTY_KEYS.add(PROP_VENDOR);
101:
102:                // Build set of required property keys for external db tables.
103:                REQUIRED_KEYS.add(PROP_DB);
104:            }
105:
106:            public ExternalAxionDBTable(String name, Database db) {
107:                _name = name;
108:                _type = EXTERNAL_DB_TABLE_TYPE;
109:                _db = db;
110:            }
111:
112:            public void addColumn(Column col) throws AxionException {
113:                _cols.add(col);
114:                publishEvent(new ColumnEvent(this , col));
115:            }
116:
117:            public void addConstraint(Constraint constraint)
118:                    throws AxionException {
119:            }
120:
121:            public void addIndex(Index index) throws AxionException {
122:                _remoteTable.addIndex(index);
123:            }
124:
125:            public void addRow(Row row) throws AxionException {
126:                _remoteTable.addRow(row);
127:            }
128:
129:            public void applyDeletes(IntCollection rowIds)
130:                    throws AxionException {
131:                _remoteTable.applyDeletes(rowIds);
132:            }
133:
134:            public void applyInserts(RowCollection rows) throws AxionException {
135:                _remoteTable.applyInserts(rows);
136:            }
137:
138:            public void applyUpdates(RowCollection rows) throws AxionException {
139:                _remoteTable.applyUpdates(rows);
140:            }
141:
142:            public void checkpoint() throws AxionException {
143:            }
144:
145:            public void deleteRow(Row row) throws AxionException {
146:                _remoteTable.deleteRow(row);
147:            }
148:
149:            public void drop() throws AxionException {
150:                if (_remoteTable != null) {
151:                    _remoteTable.drop();
152:                    cleanUp();
153:                }
154:            }
155:
156:            public void freeRowId(int id) {
157:                _remoteTable.freeRowId(id);
158:            }
159:
160:            public Column getColumn(int index) {
161:                return _remoteTable.getColumn(index);
162:            }
163:
164:            public Column getColumn(String name) {
165:                return _remoteTable.getColumn(name);
166:            }
167:
168:            public int getColumnCount() {
169:                return _remoteTable.getColumnCount();
170:            }
171:
172:            public List getColumnIdentifiers() {
173:                return _remoteTable.getColumnIdentifiers();
174:            }
175:
176:            public int getColumnIndex(String name) throws AxionException {
177:                return _remoteTable.getColumnIndex(name);
178:            }
179:
180:            public Iterator getConstraints() {
181:                return _remoteTable.getConstraints();
182:            }
183:
184:            public String getDBLinkName() {
185:                return _dblink;
186:            }
187:
188:            public RowIterator getIndexedRows(RowSource source,
189:                    Selectable node, boolean readOnly) throws AxionException {
190:                return _remoteTable.getIndexedRows(source, node, readOnly);
191:            }
192:
193:            public RowIterator getIndexedRows(Selectable node, boolean readOnly)
194:                    throws AxionException {
195:                return _remoteTable.getIndexedRows(node, readOnly);
196:            }
197:
198:            public Index getIndexForColumn(Column column) {
199:                return _remoteTable.getIndexForColumn(column);
200:            }
201:
202:            public Iterator getIndices() {
203:                return _remoteTable.getIndices();
204:            }
205:
206:            public RowIterator getMatchingRows(List selectables, List values,
207:                    boolean readOnly) throws AxionException {
208:                return _remoteTable.getMatchingRows(selectables, values,
209:                        readOnly);
210:            }
211:
212:            public String getName() {
213:                return _name;
214:            }
215:
216:            public int getNextRowId() {
217:                return _remoteTable.getNextRowId();
218:            }
219:
220:            public Row getRow(int id) throws AxionException {
221:                return _remoteTable.getRow(id);
222:            }
223:
224:            public int getRowCount() {
225:                return _remoteTable.getRowCount();
226:            }
227:
228:            public RowIterator getRowIterator(boolean readOnly)
229:                    throws AxionException {
230:                return _remoteTable.getRowIterator(readOnly);
231:            }
232:
233:            public Sequence getSequence() {
234:                return _remoteTable.getSequence();
235:            }
236:
237:            public Properties getTableProperties() {
238:                return context.getTableProperties();
239:            }
240:
241:            public String getType() {
242:                return _type;
243:            }
244:
245:            public boolean hasColumn(ColumnIdentifier id) {
246:                boolean result = false;
247:                String tableName = id.getTableName();
248:                if (tableName == null || tableName.equals(getName())) {
249:                    result = (getColumn(id.getName()) != null);
250:                }
251:                return result;
252:            }
253:
254:            public boolean hasIndex(String name) throws AxionException {
255:                return _remoteTable.hasIndex(name);
256:            }
257:
258:            public boolean isColumnIndexed(Column column) {
259:                return _remoteTable.isColumnIndexed(column);
260:            }
261:
262:            public boolean isPrimaryKeyConstraintExists(String columnName) {
263:                return _remoteTable.isPrimaryKeyConstraintExists(columnName);
264:            }
265:
266:            public boolean isUniqueConstraintExists(String columnName) {
267:                return _remoteTable.isUniqueConstraintExists(columnName);
268:            }
269:
270:            public boolean loadExternalTable(Properties props)
271:                    throws AxionException {
272:                context = new ExternalDatabaseTableOrganizationContext();
273:                context.readOrSetDefaultProperties(props);
274:                context.updateProperties();
275:                return true;
276:            }
277:
278:            public RowDecorator makeRowDecorator() {
279:                return _remoteTable.makeRowDecorator();
280:            }
281:
282:            public TransactableTable makeTransactableTable() {
283:                return new TransactableTableImpl(this );
284:            }
285:
286:            public void migrate() throws AxionException {
287:            }
288:
289:            public void populateIndex(Index index) throws AxionException {
290:                _remoteTable.populateIndex(index);
291:            }
292:
293:            public void remount() throws AxionException {
294:            }
295:
296:            public void remount(File dir, boolean datafilesonly)
297:                    throws AxionException {
298:            }
299:
300:            public Constraint removeConstraint(String name) {
301:                return _remoteTable.removeConstraint(name);
302:            }
303:
304:            public Constraint getConstraint(String name) {
305:                return _remoteTable.getConstraint(name);
306:            }
307:
308:            public void removeIndex(Index index) throws AxionException {
309:                _remoteTable.removeIndex(index);
310:            }
311:
312:            public void rename(String oldName, String newName)
313:                    throws AxionException {
314:                _remoteTable.rename(oldName, newName);
315:            }
316:
317:            public void setSequence(Sequence seq) throws AxionException {
318:            }
319:
320:            public void shutdown() throws AxionException {
321:                cleanUp();
322:            }
323:
324:            public String toString() {
325:                return getName();
326:            }
327:
328:            public void truncate() throws AxionException {
329:                _remoteTable.truncate();
330:            }
331:
332:            public void updateRow(Row oldrow, Row newrow) throws AxionException {
333:                _remoteTable.updateRow(oldrow, newrow);
334:            }
335:
336:            private void assertColumns() throws AxionException {
337:                Iterator iter = _cols.iterator();
338:                while (iter.hasNext()) {
339:                    Column col = (Column) iter.next();
340:                    if (!hasColumn(new ColumnIdentifier(null, col.getName(),
341:                            null, col.getDataType()))) {
342:                        throw new AxionException("Column " + col
343:                                + "does not exist in remote table"
344:                                + _remoteTableName);
345:                    }
346:                }
347:            }
348:
349:            private void cleanUp() throws AxionException {
350:                _remoteDb = null;
351:                _remoteTable = null;
352:            }
353:
354:            private void setUp(DatabaseLink server) throws AxionException {
355:                if (_remoteDb == null) {
356:                    String url = server.getJdbcUrl();
357:                    String name;
358:                    File path = null;
359:                    String prefixStripped = url
360:                            .substring(ConnectionFactory.URL_PREFIX.length());
361:                    int colon = prefixStripped.indexOf(":");
362:                    if (colon == -1 || (prefixStripped.length() - 1 == colon)) {
363:                        name = prefixStripped;
364:                    } else {
365:                        name = prefixStripped.substring(0, colon);
366:                        path = new File(prefixStripped.substring(colon + 1));
367:                    }
368:
369:                    _remoteDb = Databases.getOrCreateDatabase(name, path);
370:                    _remoteTable = _remoteDb.getTable(_remoteTableName);
371:                }
372:
373:                if (_remoteTable == null) {
374:                    throw new AxionException(
375:                            "Initialization error for remote table "
376:                                    + getName());
377:                }
378:            }
379:
380:            private class ExternalDatabaseTableOrganizationContext extends
381:                    BaseTableOrganizationContext {
382:
383:                public Set getPropertyKeys() {
384:                    Set baseKeys = getBasePropertyKeys();
385:                    Set keys = new HashSet(baseKeys.size()
386:                            + PROPERTY_KEYS.size());
387:                    keys.addAll(baseKeys);
388:                    keys.addAll(PROPERTY_KEYS);
389:
390:                    return keys;
391:                }
392:
393:                public Set getRequiredPropertyKeys() {
394:                    Set baseRequiredKeys = getBaseRequiredPropertyKeys();
395:                    Set keys = new HashSet(baseRequiredKeys.size()
396:                            + REQUIRED_KEYS.size());
397:                    keys.addAll(baseRequiredKeys);
398:                    keys.addAll(REQUIRED_KEYS);
399:
400:                    return keys;
401:                }
402:
403:                public void readOrSetDefaultProperties(Properties props)
404:                        throws AxionException {
405:                    // Validate all supplied property keys to ensure they are recognized.
406:                    super .assertValidPropertyKeys(props);
407:
408:                    _dblink = props.getProperty(PROP_DB);
409:                    if (_dblink == null || _dblink.trim().length() == 0
410:                            || !_db.hasDatabaseLink(_dblink)) {
411:                        throw new AxionException(
412:                                "Please provide a valid server name");
413:                    }
414:
415:                    DatabaseLink server = _db.getDatabaseLink(_dblink);
416:                    if (server == null) {
417:                        throw new AxionException("Database link " + _dblink
418:                                + " does not exist.");
419:                    }
420:
421:                    _remoteTableName = props.getProperty(PROP_REMOTETABLE);
422:                    _remoteTableName = (_remoteTableName != null) ? _remoteTableName
423:                            : getName();
424:
425:                    setUp(server);
426:                    assertColumns();
427:
428:                    _log.debug("External DB Table " + _remoteTableName
429:                            + " created.");
430:                }
431:
432:                public void updateProperties() {
433:                    super .updateProperties();
434:
435:                    setProperty(PROP_DB, _dblink);
436:                    setProperty(PROP_REMOTETABLE, _remoteTableName);
437:                    setProperty(PROP_LOADTYPE, ExternalTableFactory.TYPE_REMOTE);
438:                    setProperty(PROP_VENDOR, "AXION");
439:                }
440:            }
441:
442:            private List _cols = new ArrayList();
443:
444:            private Database _db;
445:            private String _dblink;
446:
447:            private String _name = null;
448:
449:            private Database _remoteDb;
450:            private Table _remoteTable;
451:            private String _remoteTableName;
452:
453:            private String _type = null;
454:
455:            private ExternalDatabaseTableOrganizationContext context;
456:
457:        }
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