Source Code Cross Referenced for TableIterator.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » db » table » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.db.table 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.db.table;
031:
032:        import com.caucho.db.sql.QueryContext;
033:        import com.caucho.db.sql.SelectResult;
034:        import com.caucho.db.store.Block;
035:        import com.caucho.db.store.Store;
036:        import com.caucho.db.store.Transaction;
037:        import com.caucho.util.L10N;
038:
039:        import java.io.IOException;
040:        import java.sql.SQLException;
041:
042:        /**
043:         * Iterates over a table's rows.
044:         */
045:        public class TableIterator {
046:            private static final L10N L = new L10N(TableIterator.class);
047:
048:            private final static byte[] _nullBuffer = new byte[256];
049:
050:            private Table _table;
051:            private Column[] _columns;
052:
053:            private Transaction _xa;
054:            private QueryContext _queryContext;
055:
056:            private long _blockId;
057:            private int _rowLength;
058:            private int _rowEnd;
059:            private int _rowOffset;
060:
061:            private Block _block;
062:            private byte[] _buffer;
063:
064:            public TableIterator() {
065:            }
066:
067:            TableIterator(Table table) {
068:                init(table);
069:            }
070:
071:            public void init(Table table) {
072:                _table = table;
073:
074:                if (table.getId() == 0) {
075:                    throw new IllegalStateException(L
076:                            .l("iterating with closed table."));
077:                }
078:
079:                _columns = table.getColumns();
080:
081:                _rowLength = table.getRowLength();
082:                _rowEnd = table.getRowEnd();
083:                _rowOffset = _rowEnd;
084:                _blockId = 0;
085:            }
086:
087:            /**
088:             * Returns the table of the iterator.
089:             */
090:            public Table getTable() {
091:                return _table;
092:            }
093:
094:            /**
095:             * Returns the current block id of the iterator.
096:             */
097:            public final long getBlockId() {
098:                return _blockId;
099:            }
100:
101:            /**
102:             * Sets the current block id of the iterator.
103:             */
104:            public final void setBlockId(long blockId) {
105:                _blockId = blockId;
106:            }
107:
108:            /**
109:             * Returns the current address.
110:             */
111:            public final long getRowAddress() {
112:                return _table.blockIdToAddress(_blockId) + _rowOffset;
113:            }
114:
115:            /**
116:             * Returns the current row offset of the iterator.
117:             */
118:            public final int getRowOffset() {
119:                return _rowOffset;
120:            }
121:
122:            /**
123:             * Sets the current row offset of the iterator.
124:             */
125:            public final void setRowOffset(int rowOffset) {
126:                _rowOffset = rowOffset;
127:            }
128:
129:            /**
130:             * Gets the current block.
131:             */
132:            public final byte[] getBuffer() {
133:                return _buffer;
134:            }
135:
136:            /**
137:             * Returns the transaction for the iterator.
138:             */
139:            public Transaction getTransaction() {
140:                return _xa;
141:            }
142:
143:            /**
144:             * Returns the query context for the iterator.
145:             */
146:            public QueryContext getQueryContext() {
147:                return _queryContext;
148:            }
149:
150:            public void init(QueryContext queryContext) throws SQLException {
151:                init(queryContext.getTransaction());
152:
153:                _queryContext = queryContext;
154:            }
155:
156:            public void init(Transaction xa) throws SQLException {
157:                Block block = _block;
158:                _block = null;
159:                _buffer = null;
160:
161:                if (block != null)
162:                    block.free();
163:
164:                _blockId = 0;
165:                _rowOffset = Integer.MAX_VALUE / 2;
166:                _queryContext = null;
167:                _xa = xa;
168:
169:                // XXX:
170:                /*
171:                if (! _xa.isAutoCommit())
172:                  _xa.lockRead(_table.getLock());
173:                 */
174:            }
175:
176:            public void initRow() throws IOException {
177:                _rowOffset = -_rowLength;
178:            }
179:
180:            public void prevRow() {
181:                _rowOffset -= _rowLength;
182:            }
183:
184:            /**
185:             * Sets the row.
186:             */
187:            void setRow(Block block, int rowOffset) {
188:                _block = block;
189:                _buffer = block.getBuffer();
190:                _blockId = block.getBlockId();
191:                _rowOffset = rowOffset;
192:            }
193:
194:            public Block getBlock() {
195:                return _block;
196:            }
197:
198:            /**
199:             * Returns the next tuple in the current row.
200:             *
201:             * @return true if a tuple is found,
202:             * or false if the block has no more tuples
203:             */
204:            public boolean nextRow() throws IOException {
205:                int rowOffset = _rowOffset;
206:                int rowLength = _rowLength;
207:                int rowEnd = _rowEnd;
208:                byte[] buffer = _buffer;
209:
210:                rowOffset += rowLength;
211:                for (; rowOffset < rowEnd; rowOffset += rowLength) {
212:                    if ((buffer[rowOffset] & Table.ROW_VALID) != 0) {
213:                        _rowOffset = rowOffset;
214:                        return true;
215:                    }
216:                }
217:
218:                _rowOffset = rowOffset;
219:
220:                return false;
221:            }
222:
223:            /**
224:             * Returns the next row.
225:             */
226:            public boolean next() throws IOException {
227:                do {
228:                    if (nextRow())
229:                        return true;
230:                } while (nextBlock());
231:
232:                return false;
233:            }
234:
235:            /**
236:             * Returns the following block.
237:             */
238:            public boolean nextBlock() throws IOException {
239:                byte[] buffer = _buffer;
240:
241:                Block block = _block;
242:                _block = null;
243:                _buffer = null;
244:
245:                if (block != null)
246:                    block.free();
247:
248:                _blockId = _table.firstRow(_blockId + Table.BLOCK_SIZE);
249:
250:                if (_blockId < 0) {
251:                    return false;
252:                }
253:
254:                block = _xa.readBlock(_table, _blockId);
255:
256:                buffer = block.getBuffer();
257:                _block = block;
258:                _buffer = buffer;
259:                _rowOffset = 0;
260:
261:                return true;
262:            }
263:
264:            /**
265:             * Sets the next row.
266:             */
267:            public void setRow(long rowAddr) throws IOException {
268:                long blockId = _table.addressToBlockId(rowAddr);
269:
270:                if (blockId != _blockId) {
271:                    _blockId = blockId;
272:
273:                    Block block = _block;
274:                    _block = null;
275:                    _buffer = null;
276:
277:                    if (block != null)
278:                        block.free();
279:
280:                    _block = _xa.readBlock(_table, _blockId);
281:                    _buffer = _block.getBuffer();
282:                }
283:
284:                _rowOffset = (int) (rowAddr & Store.BLOCK_OFFSET_MASK);
285:            }
286:
287:            /**
288:             * Sets the next row.
289:             */
290:            public void initNullRow() throws IOException {
291:                Block block = _block;
292:                _block = null;
293:                _buffer = null;
294:
295:                if (block != null)
296:                    block.free();
297:
298:                _rowOffset = 0;
299:                _buffer = _nullBuffer;
300:            }
301:
302:            /**
303:             * Returns true for the null for (for OUTER JOINs)
304:             */
305:            public boolean isNullRow() {
306:                return _buffer == _nullBuffer;
307:            }
308:
309:            /**
310:             * Returns true if the column is null.
311:             */
312:            public boolean isNull(Column column) throws SQLException {
313:                return column.isNull(_buffer, _rowOffset);
314:            }
315:
316:            /**
317:             * Returns the string for the column at the given index.
318:             */
319:            public String getString(Column column) throws SQLException {
320:                return column.getString(_buffer, _rowOffset);
321:            }
322:
323:            /**
324:             * Returns the column's value as an integer
325:             *
326:             * @param index column index in the row
327:             *
328:             * @return the integer value
329:             */
330:            public int getInteger(Column column) throws SQLException {
331:                return column.getInteger(_buffer, _rowOffset);
332:            }
333:
334:            /**
335:             * Returns the column's long value.
336:             *
337:             * @param index column index in the row
338:             *
339:             * @return the long value
340:             */
341:            public long getLong(Column column) throws SQLException {
342:                return column.getLong(_buffer, _rowOffset);
343:            }
344:
345:            /**
346:             * Returns the column's double value.
347:             *
348:             * @param index column index in the row
349:             *
350:             * @return the double value
351:             */
352:            public double getDouble(Column column) throws SQLException {
353:                return column.getDouble(_buffer, _rowOffset);
354:            }
355:
356:            public boolean isEqual(Column column, byte[] matchBuffer)
357:                    throws SQLException {
358:                return column.isEqual(_buffer, _rowOffset, matchBuffer, 0,
359:                        matchBuffer.length);
360:            }
361:
362:            public boolean isEqual(Column column, byte[] matchBuffer,
363:                    int matchLength) throws SQLException {
364:                return column.isEqual(_buffer, _rowOffset, matchBuffer, 0,
365:                        matchLength);
366:            }
367:
368:            public boolean isEqual(Column column, String string)
369:                    throws SQLException {
370:                return column.isEqual(_buffer, _rowOffset, string);
371:            }
372:
373:            /**
374:             * Evaluates the row to the result.
375:             */
376:            public void evalToResult(Column column, SelectResult result)
377:                    throws SQLException {
378:                column.evalToResult(_buffer, _rowOffset, result);
379:            }
380:
381:            public void delete() throws SQLException {
382:                setDirty();
383:                _table.delete(_xa, _block, _buffer, _rowOffset);
384:            }
385:
386:            public void setDirty() throws SQLException {
387:                _xa.addUpdateBlock(_block);
388:
389:                _block.setDirty(getRowOffset(), getRowOffset() + _rowLength);
390:            }
391:
392:            public void free() {
393:                Block block = _block;
394:                _block = null;
395:
396:                if (block != null)
397:                    block.free();
398:            }
399:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.