Source Code Cross Referenced for EjbqlQueryTreeHolder.java in  » J2EE » JOnAS-4.8.6 » org » objectweb » jonas_ejb » lib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » JOnAS 4.8.6 » org.objectweb.jonas_ejb.lib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * JOnAS: Java(TM) Open Application Server
003:         * Copyright (C) 1999-2004 Bull S.A.
004:         * Contact: jonas-team@objectweb.org
005:         *
006:         * This library is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU Lesser General Public
008:         * License as published by the Free Software Foundation; either
009:         * version 2.1 of the License, or any later version.
010:         *
011:         * This library is distributed in the hope that it will be useful,
012:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         * Lesser General Public License for more details.
015:         *
016:         * You should have received a copy of the GNU Lesser General Public
017:         * License along with this library; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
019:         * USA
020:         *
021:         * --------------------------------------------------------------------------
022:         * $Id: EjbqlQueryTreeHolder.java 6140 2005-01-22 01:42:53Z rhs $
023:         * --------------------------------------------------------------------------
024:         */package org.objectweb.jonas_ejb.lib;
025:
026:        import java.util.Collection;
027:        import java.util.Iterator;
028:        import java.util.Map;
029:
030:        import org.objectweb.jonas_ejb.container.TraceEjb;
031:        import org.objectweb.jonas_ejb.deployment.api.DeploymentDescEjb2;
032:        import org.objectweb.jonas_ejb.deployment.api.EntityCmp2Desc;
033:        import org.objectweb.jonas_ejb.deployment.api.MethodCmp2Desc;
034:        import org.objectweb.jonas_ejb.deployment.ejbql.ASTEJBQL;
035:        import org.objectweb.jorm.api.PMapper;
036:        import org.objectweb.jorm.metainfo.api.Manager;
037:        import org.objectweb.medor.api.Field;
038:        import org.objectweb.medor.eval.api.QueryEvaluator;
039:        import org.objectweb.medor.eval.lib.MedorEvaluator;
040:        import org.objectweb.medor.expression.api.Expression;
041:        import org.objectweb.medor.optim.api.QueryTransformer;
042:        import org.objectweb.medor.query.api.OrderField;
043:        import org.objectweb.medor.query.api.QueryTree;
044:        import org.objectweb.medor.query.api.QueryTreeField;
045:        import org.objectweb.medor.query.jorm.api.JormExtent;
046:        import org.objectweb.medor.query.jorm.lib.ClassExtent;
047:        import org.objectweb.medor.query.jorm.lib.JormQueryTreeHelper;
048:        import org.objectweb.medor.query.jorm.lib.QueryBuilder;
049:        import org.objectweb.medor.query.lib.QueryTreePrinter;
050:        import org.objectweb.medor.query.lib.SelectProject;
051:        import org.objectweb.util.monolog.api.BasicLevel;
052:
053:        /**
054:         * Class to hold the query tree of a given EJBQL request. This allows walking the
055:         * JormExtents of the tree to set the mappers.
056:         * @author  Christophe Ney - cney@batisseurs.com : Initial developer
057:         * @author Helene Joanin: Take into account the ORDER BY clause.
058:         * @author Sebastien Chassande-Barrioz & Helene Joanin: prefetch code
059:         * @author Helene Joanin: Take into account the aggregate select expression.
060:         * @author Cyrille Blot: Take into account the LIMIT clause
061:         */
062:        public class EjbqlQueryTreeHolder {
063:
064:            QueryTree queryTree = null;
065:            QueryTransformer queryOptimizer = null;
066:            QueryEvaluator optimizedQuery = null;
067:            Field resField = null;
068:            EjbqlLimiterRange[] limiterRanges = null;
069:
070:            private String beanName;
071:            private String methodName;
072:
073:            /**
074:             * Indicates the index of the identifier (PName) in the TupleCollection of
075:             * the SelectProject node (root of of the tree).
076:             */
077:            private int prefetchIdentifierIndex;
078:
079:            /**
080:             * constructor of a holder for a specific query.
081:             * @param mDesc JOnAS meta-information for the corresponding finder/select method
082:             * @param ejbql root of the lexical tree of the query
083:             * @param mapper mapper to associate at each leaves of the QueryTree.
084:             *               The mapper may be null in case of the QueryTree is build in the GenIC phase.
085:             */
086:            public EjbqlQueryTreeHolder(MethodCmp2Desc mDesc, ASTEJBQL ejbql,
087:                    PMapper mapper) throws Exception {
088:
089:                EntityCmp2Desc eDesc = (EntityCmp2Desc) mDesc.getBeanDesc();
090:                DeploymentDescEjb2 dd = (DeploymentDescEjb2) eDesc
091:                        .getDeploymentDesc();
092:                Manager jormManager = dd.getJormManager();
093:
094:                // create identifiers Map (visit ALL the query)
095:                QueryBuilder qb = new QueryBuilder();
096:                Map fields = (new EjbqlVariableVisitor(ejbql, dd, qb))
097:                        .getFields();
098:
099:                // Begin PREFETCHING CODE (by Seb)
100:                SelectProject sp = new SelectProject("");
101:                if (mDesc.getPrefetch() && (mapper != null)) {
102:                    // Find the QueryTree of the ClassExtend of the bean of the current finder method
103:                    // WARNING: This only works for finder methods, and not for ejbSelect methods!!!
104:                    //          (Indeed the result type of the query must be the bean type in which
105:                    //           the method is defined)
106:                    ClassExtent ce = null;
107:                    QueryTree qt = null;
108:                    String jormClassName = ((EntityCmp2Desc) mDesc
109:                            .getBeanDesc()).getJormClassName();
110:                    Iterator itFields = fields.values().iterator();
111:                    boolean found = false;
112:                    while (itFields.hasNext() && !found) {
113:                        QueryTree cqt = ((QueryTreeField) itFields.next())
114:                                .getQueryTree();
115:                        Collection extents = JormQueryTreeHelper
116:                                .getJormExtents(cqt);
117:                        for (Iterator it = extents.iterator(); it.hasNext()
118:                                && !found;) {
119:                            JormExtent je = (JormExtent) it.next();
120:                            if (jormClassName.equals(je.getJormName())) {
121:                                found = true;
122:                                ce = (ClassExtent) je;
123:                                qt = cqt;
124:                            }
125:                        }
126:                    }
127:                    if ((ce == null) && (qt == null)) {
128:                        throw new Error(
129:                                "EjbqlQueryTreeHolder: cannot do the prefetch !!!");
130:                    }
131:                    setMapper(qt, mapper);
132:                    // Add fields of the class which the values must be prefetched, at
133:                    // the begin of the the TupleCollection
134:                    JormQueryTreeHelper.addPrefetchFields(ce, qt, sp);
135:                    prefetchIdentifierIndex = sp.getTupleStructure().getSize() + 1;
136:                }
137:                // End PREFETCHING CODE
138:
139:                // create SelectProject (visit the SELECT clause)
140:                EjbqlSelectVisitor selectVisitor = new EjbqlSelectVisitor(
141:                        ejbql, fields, sp);
142:
143:                // create the Filter's expression (visit the WHERE clause)
144:                Expression qf = new EjbqlQueryFilterVisitor(mapper, fields,
145:                        mDesc.getMethod().getParameterTypes(), ejbql, qb)
146:                        .getQueryFilter();
147:                sp.setQueryFilter(qf);
148:
149:                // create the OrderField list (visit the ORDER BY clause)
150:                OrderField[] ofs = new EjbqlOrderByVisitor(ejbql, fields)
151:                        .getOrderFields();
152:                if (ofs.length > 0) {
153:                    sp.setOrderBy(ofs);
154:                }
155:
156:                // create the EjbqlLimiterRange list (visit the LIMIT clause)
157:                limiterRanges = new EjbqlLimitVisitor(ejbql, mDesc.getMethod()
158:                        .getParameterTypes()).getLimiterRanges();
159:
160:                queryTree = selectVisitor.getQueryTree();
161:
162:                setMapper(queryTree, mapper);
163:
164:                // Get the field description of the result of the query
165:                // Nota Bene: TupleStructures of queries non optimized and optimized are differents.
166:                resField = queryTree.getTupleStructure().getField(
167:                        queryTree.getTupleStructure().getSize());
168:
169:                // Just needed later for debug trace
170:                beanName = eDesc.getJormClassName();
171:                methodName = mDesc.getMethod().getName();
172:            }
173:
174:            private void setMapper(QueryTree tree, PMapper mapper) {
175:                // set the mapper of each leaves of the QueryTree
176:                if (mapper != null) {
177:                    Collection extents = JormQueryTreeHelper
178:                            .getJormExtents(tree);
179:                    for (Iterator it = extents.iterator(); it.hasNext();) {
180:                        JormExtent je = (JormExtent) it.next();
181:                        je.setPMapper(mapper, RdbMappingBuilder
182:                                .getProjectName());
183:                    }
184:                }
185:            }
186:
187:            public int getPrefetchIndex() {
188:                return prefetchIdentifierIndex;
189:            }
190:
191:            /**
192:             * get the query tree that was built from visiting the lexical tree
193:             */
194:            public QueryTree getQueryTree() {
195:                return queryTree;
196:            }
197:
198:            /**
199:             * Set the optimizer to be used when optimizing the query tree
200:             */
201:            public void setQueryOptimizer(QueryTransformer qtf) {
202:                optimizedQuery = null;
203:                queryOptimizer = qtf;
204:            }
205:
206:            /**
207:             * get the current query tree optimizer
208:             */
209:            public QueryTransformer getQueryOptimizer() {
210:                return queryOptimizer;
211:            }
212:
213:            /**
214:             * get the Medor result Field of the query (useful for the ejbSelect method)
215:             */
216:            public Field getResField() {
217:                return resField;
218:            }
219:
220:            /**
221:             * @return returns the limiter ranges of the LIMIT clause.
222:             * May be 0 element if no LIMIT clause, 1 or 2 elements otherwise.
223:             */
224:            public EjbqlLimiterRange[] getLimiterRanges() {
225:                return limiterRanges;
226:            }
227:
228:            /**
229:             * Get the query evaluator of the optimized query. The query is optimized on first call.
230:             * All mappers of the query should have been already set with the help of the iterator
231:             * returned by the <code>getJormExtentIterator</code> method.
232:             */
233:            public QueryEvaluator getOptimizedQueryTree() throws Exception {
234:                if (optimizedQuery == null) {
235:                    if (TraceEjb.isDebugQuery()) {
236:                        TraceEjb.query.log(BasicLevel.DEBUG,
237:                                "Initial QueryTree of the method " + methodName
238:                                        + " of the bean " + beanName);
239:                        QueryTreePrinter.printQueryTree(queryTree,
240:                                TraceEjb.query, BasicLevel.DEBUG);
241:                    }
242:                    QueryTree qt = queryOptimizer.transform(queryTree);
243:                    if (TraceEjb.isDebugQuery()) {
244:                        TraceEjb.query.log(BasicLevel.DEBUG,
245:                                "Optimized QueryTree of the method "
246:                                        + methodName + " of the bean "
247:                                        + beanName);
248:                        QueryTreePrinter.printQueryTree(qt, TraceEjb.query,
249:                                BasicLevel.DEBUG);
250:                    }
251:                    optimizedQuery = new MedorEvaluator(qt, 0);
252:                }
253:                return optimizedQuery;
254:            }
255:
256:        }
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