FODBSodaQuery.java

00001 /*
00002  * OpenMobileIS - a free Java(TM) Framework for mobile applications Java(TM)
00003  * Copyright (C) 2004-2006 Philippe Delrieu
00004  * All rights reserved.
00005  * Contact: pdelrieu@openmobileis.org
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
00020  * USA
00021  *
00022  *  Author : Philippe Delrieu
00023  *  
00024  *  Modifications :
00025  *  2004 Creation P.Delrieu
00026  *  2004 Modified by Romain Beaugrand
00027  * 
00028  */
00029 package org.openmobileis.database.fastobjectdb.db.query.soda;
00030 
00031 import org.odbms.Constraint;
00032 import org.odbms.Constraints;
00033 import org.odbms.ObjectSet;
00034 import org.odbms.Query;
00035 import org.openmobileis.common.util.collection.LongArray;
00036 import org.openmobileis.common.util.log.LogManager;
00037 import org.openmobileis.database.fastobjectdb.FastObjectDB;
00038 import org.openmobileis.database.fastobjectdb.db.CollectionManager;
00039 import org.openmobileis.database.fastobjectdb.db.FODBCollection;
00040 import org.openmobileis.database.fastobjectdb.db.index.FODBIndex;
00041 
00117 public final class FODBSodaQuery implements Query {
00118         private CollectionManager colManager;
00119         private boolean queryNoError = true;
00120         private FODBSodaConstraint firstConstraint;
00121         private int constraintId = 0;
00122         private FODBCollection collection; 
00123         private FastObjectDB db;
00124         
00128   public FODBSodaQuery(CollectionManager colManager, FastObjectDB db) {
00129     super();
00130     this.colManager = colManager;
00131     this.db = db;
00132   }
00133 
00134   /* (non-Javadoc)
00135    * @see org.odbms.Query#constrain(java.lang.Object)
00136    */
00137   public Constraint constrain(Object constraint) {
00138         if (constraint instanceof Class)        {
00139                         FODBCollection col = colManager.getCollectionByType((Class) constraint);
00140                         if (col != null)        {
00141                                 FODBSodaConstraint constr = new FODBSodaConstraint(this, constraintId++);
00142                                 firstConstraint = constr;
00143                                 this.setCollection(col);
00144                         }
00145                 } else  {
00146                         if (constraint instanceof String)       {
00147                                 FODBCollection col = colManager.getCollectionByName((String) constraint);
00148                                 if ((col != null) && (this.collection == null)) {
00149                                         this.setCollection(col);
00150                                         if (firstConstraint == null)    {
00151                                                 FODBSodaConstraint constr = new FODBSodaConstraint(this, constraintId++);
00152                                                 firstConstraint = constr;
00153                                         }
00154                                         return firstConstraint;
00155                                 }
00156                         }
00157                         FODBSodaConstraint path = (FODBSodaConstraint)firstConstraint;
00158                         if (path.hasOperande)   { //if already declared create a new constraint. One constraint per operation.
00159                                 path = new FODBSodaConstraint(this, constraintId++);
00160                                 FODBIndex index = collection.getIndexByMember(firstConstraint.getIndexMember());
00161                                 if (index != null)      {
00162                                         FODBSodaIndexPath ipath = new FODBSodaIndexPath(index);
00163                                         path.setIndex(ipath);
00164                                 }
00165                         }
00166                         this.setError(path.setOperand(constraint));
00167                         return path;
00168         }
00169         return firstConstraint;
00170   }
00171 
00172   /* (non-Javadoc)
00173    * @see org.odbms.Query#constraints()
00174    */
00175   public Constraints constraints() {
00176                 return null;
00177   }
00178 
00179   /* (non-Javadoc)
00180    * @see org.odbms.Query#execute()
00181    */
00182   public ObjectSet execute() {
00183                 FODBSodaObjectSet set = new FODBSodaObjectSet();
00184         if ((queryNoError) && (firstConstraint != null))        {
00185                 try     {
00186                                 db.getTransactionManager().begin();
00187                         try     {
00188           db.getTransactionManager().enterTransaction(this.collection.getName());
00189                                 LongArray arrayLong = new LongArray();
00190                         firstConstraint.execute(arrayLong);
00191                         set.addCollectionPtrs(arrayLong.toArray(), this.collection);
00192                         } finally       {
00193                                         db.getTransactionManager().commit();
00194                         }
00195                 } catch (Throwable ex)  {
00196                         LogManager.traceError(0, ex);
00197                 }
00198         }
00199     return set;
00200   }
00201 
00202   /* (non-Javadoc)
00203    * @see org.odbms.Query#descend(java.lang.String)
00204    */
00205   public Query descend(String fieldName) {
00206         if (firstConstraint != null)    {
00207                         FODBSodaQuery retQuery = this;
00208                         FODBSodaConstraint constr = firstConstraint;
00209                 if (firstConstraint.hasIndex()) {
00210                                 retQuery = new FODBSodaQuery(colManager, db);
00211                                 retQuery.setCollection(this.collection);
00212                                 constr = new FODBSodaConstraint(this, constraintId++);
00213                                 retQuery.setFirstConstraint(constr);
00214 //                              this.firstConstraint.setNextConstraint(constr, BaseConstraint.CONSTRAINT_AND);
00215                 }
00216                         FODBIndex index = collection.getIndexByMember(fieldName);
00217                         if (index != null)      {
00218                                 FODBSodaIndexPath ipath = new FODBSodaIndexPath(index);
00219                                 retQuery.getFirstConstraint().setIndex(ipath);
00220                                 return retQuery;
00221                         } else  {
00222                                 this.setError(false);
00223                         }
00224         } else  {
00225                 this.setError(false);
00226         }
00227                 return null;
00228   }
00229   
00230   private void setError(boolean error)  {
00231         if (!error)     {
00232                 queryNoError = error;
00233         }
00234         
00235   }
00236 
00237   /* (non-Javadoc)
00238    * @see org.odbms.Query#orderAscending()
00239    */
00240   public Query orderAscending() {
00241     // TODO Auto-generated method stub
00242     return null;
00243   }
00244 
00245   /* (non-Javadoc)
00246    * @see org.odbms.Query#orderDescending()
00247    */
00248   public Query orderDescending() {
00249     // TODO Auto-generated method stub
00250     return null;
00251   }
00252 
00253         /* (non-Javadoc)
00254          * @see org.odbms.Constraint#or(org.odbms.Constraint)
00255          */
00256         Constraint or(Constraint with) {
00257                 // TODO Auto-generated method stub
00258                 return null;
00259         }
00260 
00264   void setCollection(FODBCollection collection) {
00265     this.collection = collection;
00266   }
00267 
00271   void setFirstConstraint(FODBSodaConstraint constraint) {
00272     firstConstraint = constraint;
00273   }
00274 
00275   FODBSodaConstraint getFirstConstraint() {
00276     return firstConstraint;
00277   }
00278 
00279 }

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