Source Code Cross Referenced for QueryStatementHelper.java in  » J2EE » Jaffa » org » jaffa » persistence » engines » jdbcengine » querygenerator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.persistence.engines.jdbcengine.querygenerator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ====================================================================
003:         * JAFFA - Java Application Framework For All
004:         *
005:         * Copyright (C) 2002 JAFFA Development Group
006:         *
007:         *     This library is free software; you can redistribute it and/or
008:         *     modify it under the terms of the GNU Lesser General Public
009:         *     License as published by the Free Software Foundation; either
010:         *     version 2.1 of the License, or (at your option) any later version.
011:         *
012:         *     This library is distributed in the hope that it will be useful,
013:         *     but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         *     Lesser General Public License for more details.
016:         *
017:         *     You should have received a copy of the GNU Lesser General Public
018:         *     License along with this library; if not, write to the Free Software
019:         *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020:         *
021:         * Redistribution and use of this software and associated documentation ("Software"),
022:         * with or without modification, are permitted provided that the following conditions are met:
023:         * 1.	Redistributions of source code must retain copyright statements and notices.
024:         *         Redistributions must also contain a copy of this document.
025:         * 2.	Redistributions in binary form must reproduce the above copyright notice,
026:         * 	this list of conditions and the following disclaimer in the documentation
027:         * 	and/or other materials provided with the distribution.
028:         * 3.	The name "JAFFA" must not be used to endorse or promote products derived from
029:         * 	this Software without prior written permission. For written permission,
030:         * 	please contact mail to: jaffagroup@yahoo.com.
031:         * 4.	Products derived from this Software may not be called "JAFFA" nor may "JAFFA"
032:         * 	appear in their names without prior written permission.
033:         * 5.	Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net).
034:         *
035:         * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         */
049:
050:        package org.jaffa.persistence.engines.jdbcengine.querygenerator;
051:
052:        import org.apache.log4j.Logger;
053:        import java.util.*;
054:        import java.io.IOException;
055:        import org.jaffa.persistence.Criteria;
056:        import org.jaffa.persistence.AtomicCriteria;
057:        import org.jaffa.persistence.engines.jdbcengine.configservice.ConfigurationService;
058:        import org.jaffa.persistence.engines.jdbcengine.configservice.ClassMetaData;
059:        import org.jaffa.persistence.engines.jdbcengine.variants.Variant;
060:
061:        /** Use the helper method to generate SQL statements for quering the database.
062:         */
063:        public class QueryStatementHelper {
064:
065:            private static final Logger log = Logger
066:                    .getLogger(QueryStatementHelper.class);
067:
068:            // some constants that are used internally
069:            private static final String SELECT = "SELECT";
070:            private static final String DISTINCT = "DISTINCT";
071:            private static final String FROM = "FROM";
072:            private static final String WHERE = "WHERE";
073:            private static final String AND = "AND";
074:            private static final String OR = "OR";
075:            private static final String IS_NULL = "IS NULL";
076:            private static final String IS_NOT_NULL = "IS NOT NULL";
077:            private static final String LIKE = "LIKE";
078:            private static final String ORDER_BY = "ORDER BY";
079:            private static final String ASC = "ASC";
080:            private static final String DESC = "DESC";
081:            private static final String TABLE_NAME_PREFIX = "T";
082:
083:            private static Map c_fieldListCache = new WeakHashMap();
084:
085:            /** This parses a <code>Criteria</code> object for constructing relevant SQL.
086:             * @param criteria the object containing query data.
087:             * @param engineType The engine type as defined in init.xml
088:             * @throws IOException if any error occurs while extracting the String from the criteria.
089:             * @return a String representing SQL statement.
090:             */
091:            public static String getStatement(Criteria criteria,
092:                    String engineType) throws IOException {
093:                ClassMetaData meta = ConfigurationService.getInstance()
094:                        .getMetaData(criteria.getTable());
095:
096:                // This buffer will hold the SQL
097:                StringBuffer buf = new StringBuffer(SELECT);
098:
099:                // This will ensure distinct records are returned during JOINs
100:                if (criteria.getAggregates() != null
101:                        && criteria.getAggregates().size() > 0) {
102:                    buf.append(' ');
103:                    buf.append(DISTINCT);
104:                }
105:
106:                // Add the field-list
107:                buf.append(' ');
108:                buf.append(getFieldList(meta));
109:
110:                // Create 2 buffers for holding the From and Where clauses.
111:                // And then invoke the recursive 'parse' routine to fill up the 2 buffers
112:                StringBuffer fromBuf = new StringBuffer();
113:                StringBuffer whereBuf = new StringBuffer();
114:                doFromAndWhere(criteria, meta, null, null, null, new Counter(),
115:                        fromBuf, whereBuf, engineType);
116:
117:                // Add the From clause
118:                if (fromBuf.length() > 0) {
119:                    buf.append(' ');
120:                    buf.append(FROM);
121:                    buf.append(' ');
122:                    buf.append(fromBuf.toString());
123:                }
124:
125:                // Added for supplying Locking 'Hints' used by MS-Sql-Server
126:                if (criteria.getLocking() == Criteria.LOCKING_PARANOID)
127:                    buf
128:                            .append(' ')
129:                            .append(
130:                                    Variant
131:                                            .getProperty(
132:                                                    engineType,
133:                                                    Variant.PROP_LOCK_CONSTRUCT_IN_FROM_SELECT_STATEMENT));
134:
135:                // Add the Where clause
136:                if (whereBuf.length() > 0) {
137:                    buf.append(' ');
138:                    buf.append(WHERE);
139:                    buf.append(' ');
140:                    buf.append(whereBuf.toString());
141:                }
142:
143:                // Append the ordering information, if any
144:                Collection orderBys = criteria.getOrderBys();
145:                if (orderBys != null && orderBys.size() > 0) {
146:                    buf.append(' ');
147:                    buf.append(ORDER_BY);
148:                    buf.append(' ');
149:                    boolean firstPass = true;
150:                    for (Iterator itr = orderBys.iterator(); itr.hasNext();) {
151:                        if (firstPass)
152:                            firstPass = false;
153:                        else
154:                            buf.append(',');
155:                        Criteria.OrderBy orderBy = (Criteria.OrderBy) itr
156:                                .next();
157:                        buf.append(meta.getTable());
158:                        buf.append('.');
159:                        buf
160:                                .append(meta.getSqlName(orderBy
161:                                        .getOrderByElement()));
162:                        if (orderBy.getOrdering() == Criteria.ORDER_BY_ASC) {
163:                            buf.append(' ');
164:                            buf.append(ASC);
165:                        } else {
166:                            buf.append(' ');
167:                            buf.append(DESC);
168:                        }
169:                    }
170:                }
171:
172:                // check the locking strategy
173:                if (criteria.getLocking() == Criteria.LOCKING_PARANOID) {
174:                    buf.append(' ');
175:                    buf.append(Variant.getProperty(engineType,
176:                            Variant.PROP_LOCK_CONSTRUCT_IN_SELECT_STATEMENT));
177:                }
178:
179:                return buf.toString();
180:            }
181:
182:            /** Recursive method which parses a <code>Criteria</code> object for constructing relevant SQL.
183:             * It fills the 2 input buffers with relevant SQL
184:             */
185:            private static void doFromAndWhere(Criteria criteria,
186:                    ClassMetaData meta, Criteria parentCriteria,
187:                    ClassMetaData parentMeta, String parentTableName,
188:                    Counter tableCounter, StringBuffer fromBuf,
189:                    StringBuffer whereBuf, String engineType)
190:                    throws IOException {
191:                String tableName = null;
192:                if (tableCounter.getCount() == 0) {
193:                    tableName = meta.getTable();
194:                } else {
195:                    tableName = TABLE_NAME_PREFIX + tableCounter.getCount();
196:                }
197:
198:                // Append table name
199:                if (fromBuf.length() > 0)
200:                    fromBuf.append(',');
201:                fromBuf.append(meta.getTable());
202:                if (!tableName.equals(meta.getTable())) {
203:                    fromBuf.append(' ');
204:                    fromBuf.append(tableName);
205:                }
206:
207:                // Now do the where clause
208:                doWhere(criteria, meta, tableName, parentMeta, parentTableName,
209:                        whereBuf, engineType);
210:
211:                // Check for aggregates
212:                Collection aggregates = criteria.getAggregates();
213:                if (aggregates != null) {
214:                    for (Iterator itr = aggregates.iterator(); itr.hasNext();) {
215:                        tableCounter.increment();
216:                        Criteria aggregate = (Criteria) itr.next();
217:                        doFromAndWhere(aggregate, ConfigurationService
218:                                .getInstance()
219:                                .getMetaData(aggregate.getTable()), criteria,
220:                                meta, tableName, tableCounter, fromBuf,
221:                                whereBuf, engineType);
222:                    }
223:                }
224:            }
225:
226:            private static void doWhere(Criteria criteria, ClassMetaData meta,
227:                    String tableName, ClassMetaData parentMeta,
228:                    String parentTableName, StringBuffer whereBuf,
229:                    String engineType) throws IOException {
230:                // Here we handle the join fields
231:                Collection inners = criteria.getInners();
232:                if (inners != null) {
233:                    for (Iterator i = inners.iterator(); i.hasNext();) {
234:                        if (whereBuf.length() > 0) {
235:                            whereBuf.append(' ');
236:                            whereBuf.append(AND);
237:                            whereBuf.append(' ');
238:                        }
239:                        Criteria.CriteriaEntry innerCriteriaEntry = (Criteria.CriteriaEntry) i
240:                                .next();
241:                        String tfield = meta.getSqlName(innerCriteriaEntry
242:                                .getName());
243:                        int operator = innerCriteriaEntry.getOperator();
244:                        String ofield = parentMeta
245:                                .getSqlName((String) innerCriteriaEntry
246:                                        .getValue());
247:
248:                        // Now we need to set the two fields up with their proper prefixes
249:                        tfield = tableName + '.' + tfield;
250:                        ofield = parentTableName + '.' + ofield;
251:                        whereBuf.append(parseDualOperator(tfield, operator,
252:                                ofield));
253:                    }
254:                }
255:
256:                // This handles the normal fields
257:                Collection criteraEntries = criteria.getCriteriaEntries();
258:                if (criteraEntries != null) {
259:                    for (Iterator i = criteraEntries.iterator(); i.hasNext();) {
260:                        Criteria.CriteriaEntry criteriaEntry = (Criteria.CriteriaEntry) i
261:                                .next();
262:                        if (whereBuf.length() > 0) {
263:                            whereBuf.append(' ');
264:                            if (criteriaEntry.isLogicAND())
265:                                whereBuf.append(AND);
266:                            else
267:                                whereBuf.append(OR);
268:                            whereBuf.append(' ');
269:                        }
270:                        whereBuf.append('(');
271:                        whereBuf.append(getClause(criteriaEntry, meta,
272:                                tableName, engineType));
273:                        whereBuf.append(')');
274:                    }
275:                }
276:            }
277:
278:            private static String getClause(
279:                    Criteria.CriteriaEntry criteriaEntry, ClassMetaData meta,
280:                    String tableName, String engineType) throws IOException {
281:                StringBuffer buf = new StringBuffer();
282:                if (criteriaEntry instanceof  Criteria.AtomicCriteriaEntry) {
283:                    AtomicCriteria atomicCriteria = ((Criteria.AtomicCriteriaEntry) criteriaEntry)
284:                            .getEntry();
285:                    Collection criteriaEntries = atomicCriteria
286:                            .getCriteriaEntries();
287:                    if (criteriaEntries != null) {
288:                        boolean firstPass = true;
289:                        for (Iterator i = criteriaEntries.iterator(); i
290:                                .hasNext();) {
291:                            Criteria.CriteriaEntry ce = (Criteria.CriteriaEntry) i
292:                                    .next();
293:                            if (firstPass)
294:                                firstPass = false;
295:                            else {
296:                                buf.append(' ');
297:                                buf.append(logicLookAhead(ce));
298:                                buf.append(' ');
299:                            }
300:                            buf.append('(');
301:                            buf.append(getClause(ce, meta, tableName,
302:                                    engineType));
303:                            buf.append(')');
304:                        }
305:                    }
306:                } else {
307:                    String name = meta.getSqlName(criteriaEntry.getName());
308:                    int operator = criteriaEntry.getOperator();
309:                    if (criteriaEntry.getDual()) {
310:                        String name2 = meta.getSqlName((String) criteriaEntry
311:                                .getValue());
312:                        buf.append(parseDualOperator(tableName + '.' + name,
313:                                operator, tableName + '.' + name2));
314:                    } else {
315:                        Object value = criteriaEntry.getValue();
316:                        String typeName = meta.getSqlType(criteriaEntry
317:                                .getName());
318:                        buf.append(parseOperator(tableName + '.' + name,
319:                                operator, value, typeName, engineType));
320:                    }
321:                }
322:
323:                return buf.toString();
324:            }
325:
326:            private static String logicLookAhead(
327:                    Criteria.CriteriaEntry criteriaEntry) {
328:                if (criteriaEntry instanceof  Criteria.AtomicCriteriaEntry) {
329:                    AtomicCriteria atomicCriteria = ((Criteria.AtomicCriteriaEntry) criteriaEntry)
330:                            .getEntry();
331:                    if (atomicCriteria.getOrLogic())
332:                        return OR;
333:                    else
334:                        return AND;
335:                } else {
336:                    if (criteriaEntry.getLogic() == Criteria.CriteriaEntry.LOGICAL_AND)
337:                        return AND;
338:                    else
339:                        return OR;
340:                }
341:            }
342:
343:            private static String parseOperator(String name, int operator,
344:                    Object value, String typeName, String engineType)
345:                    throws IOException {
346:                StringBuffer buf = new StringBuffer(name);
347:                buf.append(' ');
348:                switch (operator) {
349:                case Criteria.RELATIONAL_EQUALS:
350:                    buf.append('=');
351:                    buf.append(' ');
352:                    buf.append(DataTranslator.getDml(value, typeName,
353:                            engineType));
354:                    break;
355:                case Criteria.RELATIONAL_NOT_EQUALS:
356:                    buf.append('!');
357:                    buf.append('=');
358:                    buf.append(' ');
359:                    buf.append(DataTranslator.getDml(value, typeName,
360:                            engineType));
361:                    break;
362:                case Criteria.RELATIONAL_GREATER_THAN:
363:                    buf.append('>');
364:                    buf.append(' ');
365:                    buf.append(DataTranslator.getDml(value, typeName,
366:                            engineType));
367:                    break;
368:                case Criteria.RELATIONAL_GREATER_THAN_EQUAL_TO:
369:                    buf.append('>');
370:                    buf.append('=');
371:                    buf.append(' ');
372:                    buf.append(DataTranslator.getDml(value, typeName,
373:                            engineType));
374:                    break;
375:                case Criteria.RELATIONAL_SMALLER_THAN:
376:                    buf.append('<');
377:                    buf.append(' ');
378:                    buf.append(DataTranslator.getDml(value, typeName,
379:                            engineType));
380:                    break;
381:                case Criteria.RELATIONAL_SMALLER_THAN_EQUAL_TO:
382:                    buf.append('<');
383:                    buf.append('=');
384:                    buf.append(' ');
385:                    buf.append(DataTranslator.getDml(value, typeName,
386:                            engineType));
387:                    break;
388:                case Criteria.RELATIONAL_IS_NULL:
389:                    buf.append(IS_NULL);
390:                    break;
391:                case Criteria.RELATIONAL_IS_NOT_NULL:
392:                    buf.append(IS_NOT_NULL);
393:                    break;
394:                case Criteria.RELATIONAL_BEGINS_WITH:
395:                    buf.append(LIKE);
396:                    buf.append(' ');
397:                    buf.append(DataTranslator.getBeginsWithDml(value, typeName,
398:                            engineType));
399:                    break;
400:                case Criteria.RELATIONAL_ENDS_WITH:
401:                    buf.append(LIKE);
402:                    buf.append(' ');
403:                    buf.append(DataTranslator.getEndsWithDml(value, typeName,
404:                            engineType));
405:                    break;
406:                case Criteria.RELATIONAL_LIKE:
407:                    buf.append(LIKE);
408:                    buf.append(' ');
409:                    buf.append(DataTranslator.getLikeDml(value, typeName,
410:                            engineType));
411:                    break;
412:                default:
413:                    String str = "Illegal operator passed - " + operator;
414:                    log.error(str);
415:                    throw new IllegalArgumentException(str);
416:                }
417:                return buf.toString();
418:            }
419:
420:            private static String parseDualOperator(String name, int operator,
421:                    String name2) {
422:                StringBuffer buf = new StringBuffer(name);
423:                buf.append(' ');
424:                switch (operator) {
425:                case Criteria.RELATIONAL_EQUALS:
426:                    buf.append('=');
427:                    break;
428:                case Criteria.RELATIONAL_NOT_EQUALS:
429:                    buf.append('!');
430:                    buf.append('=');
431:                    break;
432:                case Criteria.RELATIONAL_GREATER_THAN:
433:                    buf.append('>');
434:                    break;
435:                case Criteria.RELATIONAL_GREATER_THAN_EQUAL_TO:
436:                    buf.append('>');
437:                    buf.append('=');
438:                    break;
439:                case Criteria.RELATIONAL_SMALLER_THAN:
440:                    buf.append('<');
441:                    break;
442:                case Criteria.RELATIONAL_SMALLER_THAN_EQUAL_TO:
443:                    buf.append('<');
444:                    buf.append('=');
445:                    break;
446:                default:
447:                    String str = "Illegal operator passed - " + operator;
448:                    log.error(str);
449:                    throw new IllegalArgumentException(str);
450:                }
451:                buf.append(' ');
452:                buf.append(name2);
453:                return buf.toString();
454:            }
455:
456:            private static String getFieldList(ClassMetaData classMetaData) {
457:                String fieldList = (String) c_fieldListCache.get(classMetaData
458:                        .getClassName());
459:                if (fieldList == null) {
460:                    StringBuffer buf = new StringBuffer();
461:                    boolean first = true;
462:                    for (Iterator i = classMetaData.getAllKeyFieldNames()
463:                            .keySet().iterator(); i.hasNext();) {
464:                        if (first)
465:                            first = false;
466:                        else
467:                            buf.append(',');
468:                        buf.append(classMetaData.getTable() + '.'
469:                                + classMetaData.getSqlName((String) i.next()));
470:                    }
471:                    for (Iterator i = classMetaData.getAttributes().keySet()
472:                            .iterator(); i.hasNext();) {
473:                        if (first)
474:                            first = false;
475:                        else
476:                            buf.append(',');
477:                        buf.append(classMetaData.getTable() + '.'
478:                                + classMetaData.getSqlName((String) i.next()));
479:                    }
480:                    synchronized (c_fieldListCache) {
481:                        //check again before inserting into cache
482:                        fieldList = (String) c_fieldListCache.get(classMetaData
483:                                .getClassName());
484:                        if (fieldList == null) {
485:                            fieldList = buf.toString();
486:                            c_fieldListCache.put(classMetaData.getClassName(),
487:                                    fieldList);
488:                        }
489:                    }
490:                }
491:                return fieldList;
492:            }
493:
494:            private static class Counter {
495:                int m_value = 0;
496:
497:                void increment() {
498:                    ++m_value;
499:                }
500:
501:                int getCount() {
502:                    return m_value;
503:                }
504:            }
505:        }
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