Source Code Cross Referenced for OneToManyJoinExpr.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.ForeignColumn;
034:        import com.caucho.amber.table.LinkColumns;
035:        import com.caucho.util.CharBuffer;
036:
037:        /**
038:         * Joins two tables as "a.children".
039:         */
040:        public class OneToManyJoinExpr extends JoinExpr {
041:            private LinkColumns _linkColumns;
042:
043:            private FromItem _sourceFromItem;
044:            private FromItem _targetFromItem;
045:
046:            /**
047:             * Creates the expr.
048:             */
049:            public OneToManyJoinExpr(LinkColumns linkColumns, FromItem source,
050:                    FromItem target) {
051:                _linkColumns = linkColumns;
052:
053:                _sourceFromItem = source;
054:                _targetFromItem = target;
055:
056:                if (source == null || target == null)
057:                    throw new NullPointerException();
058:            }
059:
060:            /**
061:             * Returns true for a boolean expression.
062:             */
063:            public boolean isBoolean() {
064:                return true;
065:            }
066:
067:            /**
068:             * Binds the expression as a select item.
069:             */
070:            public AmberExpr bindSelect(QueryParser parser) {
071:                return this ;
072:            }
073:
074:            /**
075:             * Binds the link to the from item.
076:             */
077:            public boolean bindToFromItem() {
078:                if (_sourceFromItem.getJoinExpr() == null
079:                        || _sourceFromItem.getJoinExpr().equals(this )) {
080:                    _sourceFromItem.setJoinExpr(this );
081:                    return true;
082:                }
083:
084:                ManyToOneJoinExpr manyToOne = new ManyToOneJoinExpr(
085:                        _linkColumns, _sourceFromItem, _targetFromItem);
086:
087:                if (_targetFromItem.getJoinExpr() == null
088:                        || _targetFromItem.getJoinExpr().equals(manyToOne)) {
089:                    _targetFromItem.setJoinExpr(manyToOne);
090:
091:                    return true;
092:                } else
093:                    return false;
094:            }
095:
096:            /**
097:             * Returns the target join clause.
098:             */
099:            public FromItem getJoinTarget() {
100:                return _targetFromItem;
101:            }
102:
103:            /**
104:             * Returns the parent join clause, i.e. the first in the FROM order.
105:             * <pre>
106:             * FROM o, o.children
107:             * <pre>
108:             */
109:            public FromItem getJoinParent() {
110:                return _targetFromItem;
111:            }
112:
113:            /**
114:             * Returns the id expr with the joined expression.
115:             */
116:            public AmberExpr replace(KeyColumnExpr id) {
117:                PathExpr parent = id.getParent();
118:
119:                if (parent.getChildFromItem() != _targetFromItem)
120:                    return id;
121:
122:                ForeignColumn sourceColumn = _linkColumns.getSourceColumn(id
123:                        .getColumn());
124:
125:                if (sourceColumn == null)
126:                    throw new IllegalStateException(id.getColumn().getName());
127:
128:                return new ColumnExpr(_sourceFromItem.getIdExpr(), sourceColumn);
129:            }
130:
131:            /**
132:             * Returns the id expr with the joined expression.
133:             */
134:            public AmberExpr replace(IdExpr id) {
135:                return id;
136:            }
137:
138:            /**
139:             * Returns the where clause once the parent is removed
140:             */
141:            public AmberExpr getWhere() {
142:                /*
143:                 * The code is partially correct, but the is null test isn't
144:                 * needed in many cases, so should probably test the actual
145:                 * expression
146:                 AndExpr and = new AndExpr();
147:                 IdExpr id = new IdExpr(_sourceFromItem);
148:
149:                 for (ForeignColumn column : _linkColumns.getColumns()) {
150:                 and.add(new UnaryExpr(QueryParser.NOT_NULL,
151:                 new ColumnExpr(id, column)));
152:                 }
153:
154:                 return and.getSingle();
155:                 */
156:
157:                return null;
158:            }
159:
160:            /**
161:             * Generates the where expression.
162:             */
163:            public void generateWhere(CharBuffer cb) {
164:                cb.append(_linkColumns.generateWhere(_sourceFromItem.getName(),
165:                        _targetFromItem.getName()));
166:            }
167:
168:            /**
169:             * Generates the (update) where expression.
170:             */
171:            public void generateUpdateWhere(CharBuffer cb) {
172:                generateWhere(cb);
173:            }
174:
175:            /**
176:             * Generates the having expression.
177:             */
178:            public void generateHaving(CharBuffer cb) {
179:                generateWhere(cb);
180:            }
181:
182:            /**
183:             * Generates the where expression.
184:             */
185:            public void generateJoin(CharBuffer cb) {
186:                cb.append(_linkColumns.generateJoin(_sourceFromItem.getName(),
187:                        _targetFromItem.getName()));
188:            }
189:
190:            /**
191:             * Test for equality.
192:             */
193:            public boolean equals(Object o) {
194:                if (!(o instanceof  OneToManyJoinExpr))
195:                    return false;
196:
197:                OneToManyJoinExpr joinExpr = (OneToManyJoinExpr) o;
198:
199:                return (_linkColumns.equals(joinExpr._linkColumns)
200:                        && _targetFromItem.equals(joinExpr._targetFromItem) && _sourceFromItem
201:                        .equals(joinExpr._sourceFromItem));
202:            }
203:
204:            public String toString() {
205:                return ("OneToManyJoinExpr[" + _linkColumns + ","
206:                        + _targetFromItem + "," + _sourceFromItem + "]");
207:            }
208:        }
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