Source Code Cross Referenced for DependentEntityOneToOneExpr.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:         *   Free Software Foundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.amber.expr;
030:
031:        import com.caucho.amber.query.FromItem;
032:        import com.caucho.amber.query.QueryParser;
033:        import com.caucho.amber.table.LinkColumns;
034:        import com.caucho.amber.type.RelatedType;
035:        import com.caucho.util.CharBuffer;
036:
037:        /**
038:         * Bound identifier expression.
039:         */
040:        public class DependentEntityOneToOneExpr extends AbstractPathExpr {
041:            private PathExpr _parent;
042:
043:            private LinkColumns _linkColumns;
044:
045:            private FromItem _fromItem;
046:            private FromItem _childFromItem;
047:
048:            /**
049:             * Creates a new unbound id expression.
050:             */
051:            public DependentEntityOneToOneExpr(PathExpr parent,
052:                    LinkColumns linkColumns) {
053:                _parent = parent;
054:                _linkColumns = linkColumns;
055:            }
056:
057:            /**
058:             * Returns the entity class.
059:             */
060:            public RelatedType getTargetType() {
061:                return _linkColumns.getSourceTable().getType();
062:            }
063:
064:            /**
065:             * Binds the expression as a select item.
066:             */
067:            public AmberExpr bindSelect(QueryParser parser) {
068:                // commented out: jpa/10b1
069:                // if (_fromItem == null)
070:                //   _fromItem = _parent.bindSubPath(parser);
071:
072:                _fromItem = bindSubPath(parser);
073:
074:                return this ;
075:            }
076:
077:            /**
078:             * Return the child from item.
079:             */
080:            public FromItem getChildFromItem() {
081:                return _childFromItem;
082:            }
083:
084:            /**
085:             * Binds the expression as a subpath.
086:             */
087:            public FromItem bindSubPath(QueryParser parser) {
088:                if (_childFromItem != null)
089:                    return _childFromItem;
090:
091:                DependentEntityOneToOneExpr pathExpr;
092:                pathExpr = (DependentEntityOneToOneExpr) parser.addPath(this );
093:
094:                if (pathExpr != this ) {
095:                    _fromItem = pathExpr._fromItem;
096:                    _childFromItem = pathExpr._childFromItem;
097:
098:                    return _childFromItem;
099:                }
100:
101:                _fromItem = _parent.bindSubPath(parser);
102:
103:                // added: jpa/10b0
104:                _childFromItem = parser.getSelectQuery()
105:                        .createFromItem(_linkColumns.getSourceTable(),
106:                                parser.createTableName());
107:
108:                // commented out: jpa/10b0
109:                // if (_fromItem != null) {
110:                //  _childFromItem = _fromItem.getQuery().createFromItem(_linkColumns.getSourceTable(),
111:                //                                                       parser.createTableName());
112:                // } else {
113:                //   _childFromItem = parser.getSelectQuery().createFromItem(_linkColumns.getSourceTable(),
114:                //                                                           parser.createTableName());
115:                // }
116:
117:                JoinExpr join = new ManyToOneJoinExpr(_linkColumns,
118:                        _childFromItem, _fromItem);
119:
120:                _childFromItem.setJoinExpr(join);
121:
122:                return _childFromItem;
123:            }
124:
125:            /**
126:             * Returns true if the expression uses the from item.
127:             */
128:            public boolean usesFrom(FromItem from, int type, boolean isNot) {
129:                return (_childFromItem == from && type == IS_INNER_JOIN
130:                        || _fromItem == from || _parent.usesFrom(from, type));
131:            }
132:
133:            /**
134:             * Returns the table.
135:             */
136:            /*
137:              public Table getTable()
138:              {
139:              if (_childFromItem != null)
140:              return _childFromItem.getTable();
141:              else if (_fromItem != null)
142:              return _fromItem.getTable();
143:              else
144:              return _parent.getTable();
145:              }
146:             */
147:
148:            /**
149:             * Generates the where expression.
150:             */
151:            public void generateMatchArgWhere(CharBuffer cb) {
152:                if (_fromItem != null) {
153:                    cb.append(_linkColumns.generateMatchArgSQL(_fromItem
154:                            .getName()));
155:                } else {
156:                    cb.append(_linkColumns.generateMatchArgSQL(_parent
157:                            .getChildFromItem().getName()));
158:                }
159:            }
160:
161:            /**
162:             * Generates the where expression.
163:             */
164:            public void generateWhere(CharBuffer cb) {
165:                generateInternalWhere(cb, true);
166:            }
167:
168:            /**
169:             * Generates the (update) where expression.
170:             */
171:            public void generateUpdateWhere(CharBuffer cb) {
172:                generateInternalWhere(cb, false);
173:            }
174:
175:            public String toString() {
176:                return "OneToOneExpr[" + _parent + "," + _linkColumns + "]";
177:            }
178:
179:            public int hashCode() {
180:                return 65521 * _parent.hashCode() + _linkColumns.hashCode();
181:            }
182:
183:            public boolean equals(Object o) {
184:                if (o == null || !getClass().equals(o.getClass()))
185:                    return false;
186:
187:                DependentEntityOneToOneExpr oneToOne = (DependentEntityOneToOneExpr) o;
188:
189:                return (_parent.equals(oneToOne._parent) && _linkColumns
190:                        .equals(oneToOne._linkColumns));
191:            }
192:
193:            //
194:            // private
195:
196:            private void generateInternalWhere(CharBuffer cb, boolean select) {
197:                if (_fromItem != null) {
198:
199:                    String s;
200:
201:                    if (select) {
202:
203:                        s = _fromItem.getName();
204:
205:                        cb.append(s);
206:                        cb.append('.');
207:                    }
208:
209:                    // commented out: jpa/0o12
210:                    // s = _linkColumns.getColumns().get(0).getName();
211:
212:                    s = _childFromItem.getTable().getIdColumns().get(0)
213:                            .getName();
214:
215:                    cb.append(s);
216:                } else {
217:
218:                    if (select)
219:                        super.generateWhere(cb);
220:                    else
221:                        super.generateUpdateWhere(cb);
222:                }
223:            }
224:        }
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