Source Code Cross Referenced for ColumnExpr.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.QueryParseException;
034:        import com.caucho.amber.query.QueryParser;
035:        import com.caucho.amber.table.Column;
036:        import com.caucho.amber.table.LinkColumns;
037:        import com.caucho.amber.type.Type;
038:        import com.caucho.util.CharBuffer;
039:
040:        /**
041:         * Bound identifier expression.
042:         */
043:        public class ColumnExpr extends AbstractAmberExpr {
044:            protected PathExpr _parent;
045:            // identifier name value
046:            private Column _column;
047:
048:            protected FromItem _fromItem;
049:
050:            /**
051:             * Creates a new unbound id expression.
052:             */
053:            public ColumnExpr(PathExpr parent, Column column) {
054:                _parent = parent;
055:                _column = column;
056:            }
057:
058:            /**
059:             * Returns the parent.
060:             */
061:            public PathExpr getParent() {
062:                return _parent;
063:            }
064:
065:            /**
066:             * Returns the name.
067:             */
068:            public Column getColumn() {
069:                return _column;
070:            }
071:
072:            /**
073:             * Returns the expr type.
074:             */
075:            public Type getType() {
076:                return getColumn().getType();
077:            }
078:
079:            /**
080:             * Returns true if this expr has any relationship.
081:             */
082:            public boolean hasRelationship() {
083:                // jpa/1232
084:                return !(_parent instanceof  IdExpr);
085:            }
086:
087:            /**
088:             * Returns a boolean expression.
089:             */
090:            public AmberExpr createBoolean() throws QueryParseException {
091:                if (getColumn().getType().isBoolean())
092:                    return new BooleanColumnExpr(_parent, _column);
093:                else
094:                    return super .createBoolean();
095:            }
096:
097:            /**
098:             * Binds the expression as a select item.
099:             */
100:            public AmberExpr bindSelect(QueryParser parser) {
101:                FromItem parentFromItem = _parent.bindSubPath(parser);
102:
103:                if (parentFromItem.getTable() == getColumn().getTable()) {
104:                    _fromItem = parentFromItem;
105:
106:                    return this ;
107:                }
108:
109:                LinkColumns link = getColumn().getTable().getDependentIdLink();
110:
111:                if (link == null)
112:                    return this ;
113:
114:                _fromItem = parser
115:                        .createDependentFromItem(parentFromItem, link);
116:
117:                return this ;
118:            }
119:
120:            /**
121:             * Returns true if the expression uses the from item.
122:             */
123:            public boolean usesFrom(FromItem from, int type, boolean isNot) {
124:                if (from.isOuterJoin() && type == AmberExpr.IS_INNER_JOIN) {
125:                    // jpa/115a
126:                    return false;
127:                }
128:
129:                if (_fromItem == from)
130:                    return true;
131:                else if (_fromItem == null
132:                        && _parent.getChildFromItem() == from)
133:                    return true;
134:                else
135:                    return false;
136:            }
137:
138:            /**
139:             * Replaces linked join to eliminate a table.
140:             */
141:            public AmberExpr replaceJoin(JoinExpr join) {
142:                _parent = (PathExpr) _parent.replaceJoin(join);
143:
144:                return this ;
145:            }
146:
147:            /**
148:             * Generates the where expression.
149:             */
150:            public void generateWhere(CharBuffer cb) {
151:                generateInternalWhere(cb, true);
152:            }
153:
154:            /**
155:             * Generates the (update) where expression.
156:             */
157:            public void generateUpdateWhere(CharBuffer cb) {
158:                generateInternalWhere(cb, false);
159:            }
160:
161:            /**
162:             * Generates the having expression.
163:             */
164:            public void generateHaving(CharBuffer cb) {
165:                generateWhere(cb);
166:            }
167:
168:            public String toString() {
169:                return _parent + "." + _column.getName();
170:            }
171:
172:            //
173:            // private
174:
175:            private void generateInternalWhere(CharBuffer cb, boolean select) {
176:                if (_fromItem != null) {
177:
178:                    if (select) {
179:                        cb.append(_fromItem.getName());
180:                        cb.append('.');
181:                    }
182:
183:                    cb.append(_column.getName());
184:                } else {
185:
186:                    if (select) {
187:                        cb.append(_parent.getChildFromItem().getName());
188:                        cb.append('.');
189:                    }
190:
191:                    cb.append(_column.getName());
192:                }
193:            }
194:        }
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