Source Code Cross Referenced for ManyToOneExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » amber » expr » 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.amber.expr 
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.amber.expr;
031:
032:        import com.caucho.amber.query.FromItem;
033:        import com.caucho.amber.query.QueryParser;
034:        import com.caucho.amber.table.LinkColumns;
035:        import com.caucho.amber.table.Table;
036:        import com.caucho.amber.type.RelatedType;
037:        import com.caucho.amber.type.Type;
038:        import com.caucho.util.CharBuffer;
039:
040:        /**
041:         * Link expression to a new table
042:         */
043:        public class ManyToOneExpr extends AbstractPathExpr {
044:            private PathExpr _parent;
045:
046:            private LinkColumns _linkColumns;
047:
048:            private FromItem _fromItem;
049:            private FromItem _childFromItem;
050:
051:            /**
052:             * Creates a new unbound id expression.
053:             */
054:            public ManyToOneExpr(PathExpr parent, LinkColumns linkColumns) {
055:                _parent = parent;
056:                _linkColumns = linkColumns;
057:            }
058:
059:            /**
060:             * Returns the entity class.
061:             */
062:            public RelatedType getTargetType() {
063:                return _linkColumns.getTargetTable().getType();
064:            }
065:
066:            /**
067:             * Returns the entity class.
068:             */
069:            public Type getType() {
070:                return getTargetType();
071:            }
072:
073:            /**
074:             * Binds the expression as a select item.
075:             */
076:            public AmberExpr bindSelect(QueryParser parser) {
077:                _fromItem = _parent.bindSubPath(parser);
078:
079:                return this ;
080:            }
081:
082:            /**
083:             * Return the parent from item.
084:             */
085:            public FromItem getFromItem() {
086:                return _fromItem;
087:            }
088:
089:            /**
090:             * Returns the link columns.
091:             */
092:            public LinkColumns getLinkColumns() {
093:                return _linkColumns;
094:            }
095:
096:            /**
097:             * Return the child from item.
098:             */
099:            public FromItem getChildFromItem() {
100:                return _childFromItem;
101:            }
102:
103:            /**
104:             * Binds the expression as a subpath.
105:             */
106:            public FromItem bindSubPath(QueryParser parser) {
107:                if (_childFromItem != null)
108:                    return _childFromItem;
109:
110:                ManyToOneExpr pathExpr = (ManyToOneExpr) parser.addPath(this );
111:
112:                if (pathExpr != this ) {
113:                    _fromItem = pathExpr._fromItem;
114:                    _childFromItem = pathExpr._childFromItem;
115:
116:                    return _childFromItem;
117:                }
118:
119:                // XXX: handled at constructor?
120:                _parent = _parent.bindSelect(parser, null);
121:
122:                bindSelect(parser, parser.createTableName());
123:
124:                return _childFromItem;
125:            }
126:
127:            /**
128:             * Binds the expression as a select item.
129:             */
130:            public PathExpr bindSelect(QueryParser parser, String id) {
131:                if (_childFromItem != null)
132:                    return this ;
133:
134:                if (_fromItem == null)
135:                    _fromItem = _parent.bindSubPath(parser);
136:
137:                Table targetTable = _linkColumns.getTargetTable();
138:                _childFromItem = parser.addFromItem(targetTable, id);
139:
140:                JoinExpr joinExpr;
141:                joinExpr = new ManyToOneJoinExpr(_linkColumns, _fromItem,
142:                        _childFromItem);
143:
144:                _childFromItem.setJoinExpr(joinExpr);
145:
146:                return this ;
147:            }
148:
149:            /**
150:             * Returns true if the expression uses the from item.
151:             */
152:            public boolean usesFrom(FromItem from, int type, boolean isNot) {
153:                return (_childFromItem == from && type == IS_INNER_JOIN
154:                        || _fromItem == from || _parent.usesFrom(from, type));
155:            }
156:
157:            /**
158:             * Returns true if the item is forced to exist by the parent
159:             */
160:            @Override
161:            public boolean exists(FromItem from) {
162:                return (_fromItem == from && _parent.exists());
163:            }
164:
165:            /**
166:             * Returns the table.
167:             */
168:            /*
169:              public Table getTable()
170:              {
171:              if (_childFromItem != null)
172:              return _childFromItem.getTable();
173:              else if (_fromItem != null)
174:              return _fromItem.getTable();
175:              else
176:              return _parent.getTable();
177:              }
178:             */
179:
180:            /**
181:             * Generates the where expression.
182:             */
183:            public void generateMatchArgWhere(CharBuffer cb) {
184:                if (_fromItem != null) {
185:                    cb.append(_linkColumns.generateMatchArgSQL(_fromItem
186:                            .getName()));
187:                } else {
188:                    cb.append(_linkColumns.generateMatchArgSQL(_parent
189:                            .getChildFromItem().getName()));
190:                }
191:            }
192:
193:            /**
194:             * Generates the where expression.
195:             */
196:            public void generateWhere(CharBuffer cb) {
197:                generateInternalWhere(cb, true);
198:            }
199:
200:            /**
201:             * Generates the (update) where expression.
202:             */
203:            public void generateUpdateWhere(CharBuffer cb) {
204:                generateInternalWhere(cb, false);
205:            }
206:
207:            /**
208:             * Generates the select expression.
209:             */
210:            // ejb/06q4
211:            public void generateSelect(CharBuffer cb) {
212:                String tableName;
213:
214:                if (_fromItem != null)
215:                    tableName = _fromItem.getName();
216:                else
217:                    tableName = _parent.getChildFromItem().getName();
218:
219:                cb.append(_linkColumns.generateSelectSQL(tableName));
220:            }
221:
222:            /**
223:             * Returns the parent.
224:             */
225:            public PathExpr getParent() {
226:                return _parent;
227:            }
228:
229:            public int hashCode() {
230:                return 65521 * _parent.hashCode() + _linkColumns.hashCode();
231:            }
232:
233:            public boolean equals(Object o) {
234:                if (o == null || !getClass().equals(o.getClass()))
235:                    return false;
236:
237:                ManyToOneExpr manyToOne = (ManyToOneExpr) o;
238:
239:                return (_parent.equals(manyToOne._parent) && _linkColumns
240:                        .equals(manyToOne._linkColumns));
241:            }
242:
243:            public String toString() {
244:                return "ManyToOneExpr[" + _childFromItem + "," + _fromItem
245:                        + "," + _parent + "]";
246:            }
247:
248:            //
249:            // private
250:
251:            private void generateInternalWhere(CharBuffer cb, boolean select) {
252:                if (_fromItem != null) {
253:
254:                    if (select) {
255:                        cb.append(_fromItem.getName());
256:                        cb.append('.');
257:                    }
258:
259:                    cb.append(_linkColumns.getColumns().get(0).getName());
260:                } else {
261:
262:                    if (select)
263:                        super.generateWhere(cb);
264:                    else
265:                        super.generateUpdateWhere(cb);
266:                }
267:            }
268:        }
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