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: }
|