Source Code Cross Referenced for FieldExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » ejb » ql » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.ejb.ql 
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:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.ejb.ql;
030:
031:        import com.caucho.config.ConfigException;
032:        import com.caucho.ejb.cfg21.CmpField;
033:        import com.caucho.ejb.cfg21.CmpRelation;
034:        import com.caucho.ejb.cfg21.EjbEntityBean;
035:        import com.caucho.util.CharBuffer;
036:
037:        /**
038:         * Expression representing a field or a relation.
039:         */
040:        class FieldExpr extends Expr {
041:            // base expression
042:            private PathExpr _base;
043:            // field name
044:            private String _name;
045:
046:            // bean information
047:            private EjbEntityBean _bean;
048:            // field information
049:            private CmpField _field;
050:            // relation information
051:            private CmpRelation _relation;
052:
053:            // SQL id for the results of this field
054:            private String _tableId;
055:            // base id if special
056:            private String _baseId;
057:            // sql field
058:            private String _sqlField;
059:
060:            private int _primaryKeyFieldIndex;
061:
062:            // use count
063:            private int _useCount;
064:            private boolean _hasRelation;
065:
066:            /**
067:             * Creates a new field expression.
068:             *
069:             * @param base the base expression
070:             * @param field name of the field
071:             */
072:            FieldExpr(Query query, PathExpr base, String fieldName,
073:                    CmpField field) throws ConfigException {
074:                _query = query;
075:                _base = base;
076:                _name = fieldName;
077:
078:                _field = field;
079:
080:                /*
081:                PrimaryKey key = base.getItemBean().getPrimaryKey();
082:                _primaryKeyFieldIndex = key.indexOf(field);
083:                if (_primaryKeyFieldIndex < 0)
084:                  base.setUsesField();
085:                 */
086:
087:                setJavaType(field.getJavaType());
088:            }
089:
090:            boolean hasRelation() {
091:                return _hasRelation;
092:            }
093:
094:            void setRelation() {
095:                _hasRelation = true;
096:            }
097:
098:            /**
099:             * Returns the base expression
100:             */
101:            Expr getBase() {
102:                return _base;
103:            }
104:
105:            /**
106:             * Returns the field name
107:             */
108:            String getField() {
109:                return _name;
110:            }
111:
112:            /**
113:             * Returns the bean type of the result object
114:             */
115:            EjbEntityBean getBean() {
116:                return _bean;
117:            }
118:
119:            /**
120:             * Returns the relation
121:             */
122:            CmpRelation getRelation() {
123:                return _relation;
124:            }
125:
126:            /**
127:             * Returns the SQL table identifier for the result of the field expression.
128:             */
129:            String getTableId() {
130:                return _tableId;
131:            }
132:
133:            /**
134:             * Sets the SQL table identifier for the result of the field expression.
135:             */
136:            void setTableId(String tableId) {
137:                _tableId = tableId;
138:            }
139:
140:            /**
141:             * Returns the SQL id for the base 
142:             */
143:            String getBaseId() {
144:                return _base.getTable();
145:            }
146:
147:            /**
148:             * Returns the SQL field reference.
149:             */
150:            String getSQLField() {
151:                /*
152:                if (_sqlField != null)
153:                  return _sqlField;
154:                else if (_field != null)
155:                  return _field.getSQLName();
156:                else if (_relation != null)
157:                  return _relation.getTargetSQLPrefix();
158:                else
159:                  return PersistentBean.javaToSQLName(_name);
160:                 */
161:                throw new UnsupportedOperationException();
162:            }
163:
164:            void decrementUse() {
165:                _useCount--;
166:            }
167:
168:            int getUseCount() {
169:                return _useCount;
170:            }
171:
172:            /**
173:             * For collections, returns the underlying item bean.
174:             */
175:            EjbEntityBean getItemBean() {
176:                return _bean;
177:            }
178:
179:            /*
180:            int getComponentCount()
181:            {
182:              if (isPrimaryKeyField)
183:                return base.getComponentCount();
184:
185:              return super.getComponentCount();
186:            }
187:             */
188:
189:            /**
190:             * Prints the select SQL for this expression
191:             *
192:             * @param gen the java code generator
193:             */
194:            /*
195:            void generateSelect(CharBuffer cb)
196:            {
197:            if (_primaryKeyFieldIndex >= 0) {
198:              _base.printComponent(cb, _primaryKeyFieldIndex);
199:              return;
200:            }
201:
202:            if (_query.getFromList().size() == 1) {
203:              // special case to handle strange databases
204:              cb.append(_field.getSQLName());
205:            }
206:            else {
207:              cb.append(_base.getTable());
208:              cb.append(".");
209:              cb.append(_field.getSQLName());
210:            }
211:            throw new UnsupportedOperationException();
212:            }
213:             */
214:
215:            /**
216:             * Prints the select SQL for this expression
217:             *
218:             * @param gen the java code generator
219:             */
220:            String getSelectTable(CharBuffer cb) throws ConfigException {
221:                /*
222:                if (_query.getFromList().size() == 1) {
223:                  // special case to handle strange databases
224:                  return null;
225:                }
226:                else
227:                  return _base.getTable();
228:                 */
229:                return _base.getTable();
230:            }
231:
232:            /**
233:             * Prints the where SQL for this expression
234:             *
235:             * @param gen the java code generator
236:             */
237:            void generateWhere(CharBuffer cb) {
238:                /*
239:                if (_primaryKeyFieldIndex >= 0) {
240:                  _base.generateComponent(cb, _primaryKeyFieldIndex);
241:                  return;
242:                }
243:                 */
244:
245:                /*
246:                if (_query.getFromList().size() == 1) {
247:                // special case to handle strange databases
248:                cb.append(_field.getSQLName());
249:                }
250:                else {
251:                cb.append(_base.getTable());
252:                cb.append(".");
253:                cb.append(_field.getSQLName());
254:                }
255:                 */
256:
257:                _base.generateWhere(cb);
258:                cb.append(".");
259:                cb.append(_name);
260:            }
261:
262:            /*
263:            void generateComponent(CharBuffer cb, int i)
264:            {
265:              if (_primaryKeyFieldIndex >= 0) {
266:                _base.generateComponent(cb, i);
267:                return;
268:              }
269:
270:              super.generateComponent(cb, i);
271:            }
272:             */
273:
274:            /**
275:             * Returns true if the two expressions are equal
276:             */
277:            public boolean equals(Object bObj) {
278:                if (!(bObj instanceof  FieldExpr))
279:                    return false;
280:
281:                FieldExpr b = (FieldExpr) bObj;
282:
283:                return _field.equals(b._field) && _base.equals(b._base);
284:            }
285:
286:            /**
287:             * Returns a hash code for the field
288:             */
289:            public int hashCode() {
290:                return _name.hashCode() * 65521 + _base.hashCode();
291:            }
292:
293:            public String toString() {
294:                return _base.toString() + "." + _name;
295:            }
296:        }
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