Source Code Cross Referenced for KeyManyToOneExpr.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.field.AmberField;
032:        import com.caucho.amber.field.IdField;
033:        import com.caucho.amber.field.KeyManyToOneField;
034:        import com.caucho.amber.field.KeyPropertyField;
035:        import com.caucho.amber.query.FromItem;
036:        import com.caucho.amber.query.QueryParser;
037:        import com.caucho.amber.table.Column;
038:        import com.caucho.amber.type.EntityType;
039:        import com.caucho.util.CharBuffer;
040:
041:        /**
042:         * Bound identifier expression.
043:         */
044:        public class KeyManyToOneExpr extends AbstractPathExpr implements 
045:                IdFieldExpr {
046:            private PathExpr _parent;
047:            // identifier name value
048:            private KeyManyToOneField _manyToOne;
049:
050:            private FromItem _fromItem;
051:            private FromItem _childFromItem;
052:
053:            /**
054:             * Creates a new unbound id expression.
055:             */
056:            public KeyManyToOneExpr(PathExpr parent, KeyManyToOneField manyToOne) {
057:                _parent = parent;
058:                _manyToOne = manyToOne;
059:            }
060:
061:            /**
062:             * Returns the parent expression.
063:             */
064:            public PathExpr getParent() {
065:                return _parent;
066:            }
067:
068:            /**
069:             * Returns the name.
070:             */
071:            public IdField getField() {
072:                return _manyToOne;
073:            }
074:
075:            /**
076:             * Returns the entity class.
077:             */
078:            public EntityType getTargetType() {
079:                return _manyToOne.getEntityType();
080:            }
081:
082:            /**
083:             * Returns the column.
084:             */
085:            public Column getColumn() {
086:                throw new UnsupportedOperationException();
087:            }
088:
089:            /**
090:             * Creates the expr from the path.
091:             */
092:            public AmberExpr createField(QueryParser parser, String name) {
093:                AmberField field = getTargetType().getField(name);
094:
095:                if (field == null)
096:                    return null;
097:                else if (field instanceof  IdField) {
098:                    KeyPropertyField idField = _manyToOne
099:                            .getIdField((IdField) field);
100:
101:                    return idField.createExpr(parser, _parent);
102:                } else
103:                    return field.createExpr(parser, this );
104:            }
105:
106:            /**
107:             * Binds the expression as a select item.
108:             */
109:            public AmberExpr bindSelect(QueryParser parser) {
110:                _fromItem = _parent.bindSubPath(parser);
111:
112:                return this ;
113:            }
114:
115:            /**
116:             * Return the child from item.
117:             */
118:            public FromItem getChildFromItem() {
119:                return _childFromItem;
120:            }
121:
122:            /**
123:             * Binds the expression as a subpath.
124:             */
125:            public FromItem bindSubPath(QueryParser parser) {
126:                if (_childFromItem != null)
127:                    return _childFromItem;
128:
129:                KeyManyToOneExpr pathExpr = (KeyManyToOneExpr) parser
130:                        .addPath(this );
131:
132:                if (pathExpr != this ) {
133:                    _fromItem = pathExpr._fromItem;
134:                    _childFromItem = pathExpr._childFromItem;
135:
136:                    return _childFromItem;
137:                }
138:
139:                _fromItem = _parent.bindSubPath(parser);
140:
141:                if (_fromItem != null)
142:                    _childFromItem = _fromItem.getQuery().createFromItem(
143:                            getTargetType().getTable(),
144:                            parser.createTableName());
145:                else
146:                    _childFromItem = parser.getSelectQuery().createFromItem(
147:                            getTargetType().getTable(),
148:                            parser.createTableName());
149:
150:                JoinExpr link = new ManyToOneJoinExpr(_manyToOne
151:                        .getLinkColumns(), _fromItem, _childFromItem);
152:
153:                _childFromItem.setJoinExpr(link);
154:
155:                return _childFromItem;
156:            }
157:
158:            /**
159:             * Returns true if the expression uses the from item.
160:             */
161:            public boolean usesFrom(FromItem from, int type, boolean isNot) {
162:                return from == _childFromItem || _parent.usesFrom(from, type);
163:            }
164:
165:            /**
166:             * Replaces linked join to eliminate a table.
167:             */
168:            /*
169:            public AmberExpr replaceJoin(JoinExpr join)
170:            {
171:              if (_parent instanceof IdExpr) {
172:                return join.replace(this);
173:              }
174:              else
175:                return super.replaceJoin(join);
176:            }
177:             */
178:
179:            /**
180:             * Returns the table.
181:             */
182:            /*
183:            public String getTable()
184:            {
185:              if (_childFromItem != null)
186:                return _childFromItem.getName();
187:              else if (_fromItem != null)
188:                return _fromItem.getName();
189:              else
190:                return _parent.getChildFromItem().getName();
191:            }
192:             */
193:
194:            /**
195:             * Generates the where expression.
196:             */
197:            public void generateMatchArgWhere(CharBuffer cb) {
198:                String table;
199:
200:                if (_fromItem != null)
201:                    table = _fromItem.getName();
202:                else
203:                    table = _parent.getChildFromItem().getName();
204:
205:                cb.append(_manyToOne.getLinkColumns()
206:                        .generateMatchArgSQL(table));
207:            }
208:
209:            public String toString() {
210:                return _parent + "." + getField();
211:            }
212:
213:            public int hashCode() {
214:                return 65521 * _parent.hashCode() + getField().hashCode();
215:            }
216:
217:            public boolean equals(Object o) {
218:                if (o == null || !getClass().equals(o.getClass()))
219:                    return false;
220:
221:                KeyManyToOneExpr manyToOne = (KeyManyToOneExpr) o;
222:
223:                return (_parent.equals(manyToOne._parent) && getField().equals(
224:                        manyToOne.getField()));
225:            }
226:        }
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