Source Code Cross Referenced for ParamExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » db » sql » 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.db.sql 
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.db.sql;
031:
032:        import com.caucho.log.Log;
033:        import com.caucho.util.QDate;
034:
035:        import java.io.InputStream;
036:        import java.sql.SQLException;
037:        import java.util.ArrayList;
038:        import java.util.logging.Logger;
039:
040:        class ParamExpr extends Expr {
041:            private static final Logger log = Log.open(ParamExpr.class);
042:
043:            private static final int NULL = 0;
044:            private static final int BOOLEAN = NULL + 1;
045:            private static final int STRING = BOOLEAN + 1;
046:            private static final int LONG = STRING + 1;
047:            private static final int DOUBLE = LONG + 1;
048:            private static final int DATE = DOUBLE + 1;
049:            private static final int BINARY = DATE + 1;
050:
051:            private int _index;
052:
053:            private int _type = NULL;
054:
055:            private String _stringValue;
056:            private long _longValue;
057:            private double _doubleValue;
058:
059:            private InputStream _binaryStream;
060:            private int _streamLength;
061:
062:            ParamExpr(int index) {
063:                _index = index;
064:            }
065:
066:            /**
067:             * Returns the type of the expression.
068:             */
069:            public Class getType() {
070:                switch (_type) {
071:                case NULL:
072:                    return Object.class;
073:
074:                case BOOLEAN:
075:                    return boolean.class;
076:
077:                case STRING:
078:                    return String.class;
079:
080:                case LONG:
081:                    return long.class;
082:
083:                case DOUBLE:
084:                    return double.class;
085:
086:                case DATE:
087:                    return java.util.Date.class;
088:
089:                case BINARY:
090:                    return java.io.InputStream.class;
091:
092:                default:
093:                    return Object.class;
094:                }
095:            }
096:
097:            /**
098:             * Returns the subcost based on the given FromList.
099:             */
100:            public long subCost(ArrayList<FromItem> fromList) {
101:                return 0;
102:            }
103:
104:            /**
105:             * Clers the value.
106:             */
107:            public void clear() {
108:                _type = NULL;
109:            }
110:
111:            /**
112:             * Sets the value as a string.
113:             */
114:            public void setString(String value) {
115:                if (value == null)
116:                    _type = NULL;
117:                else {
118:                    _type = STRING;
119:                    _stringValue = value;
120:                }
121:            }
122:
123:            /**
124:             * Sets the value as a boolean.
125:             */
126:            public void setBoolean(boolean value) {
127:                _type = BOOLEAN;
128:                _longValue = value ? 1 : 0;
129:            }
130:
131:            /**
132:             * Sets the value as a long.
133:             */
134:            public void setLong(long value) {
135:                _type = LONG;
136:                _longValue = value;
137:            }
138:
139:            /**
140:             * Sets the value as a double.
141:             */
142:            public void setDouble(double value) {
143:                _type = DOUBLE;
144:                _doubleValue = value;
145:            }
146:
147:            /**
148:             * Sets the value as a date.
149:             */
150:            public void setDate(long value) {
151:                _type = DATE;
152:                _longValue = value;
153:            }
154:
155:            /**
156:             * Sets the value as a stream.
157:             */
158:            public void setBinaryStream(InputStream is, int length) {
159:                _type = BINARY;
160:                _binaryStream = is;
161:                _streamLength = length;
162:            }
163:
164:            /**
165:             * Evaluates the expression as a string.
166:             *
167:             * @param rows the current database tuple
168:             *
169:             * @return the string value
170:             */
171:            public boolean isNull(QueryContext context) throws SQLException {
172:                return _type == NULL;
173:            }
174:
175:            /**
176:             * Evaluates the expression as a string.
177:             *
178:             * @param rows the current database tuple
179:             *
180:             * @return the string value
181:             */
182:            public String evalString(QueryContext context) throws SQLException {
183:                switch (_type) {
184:                case NULL:
185:                    return null;
186:
187:                case BOOLEAN:
188:                    return _longValue != 0 ? "1" : "0";
189:
190:                case STRING:
191:                    return _stringValue;
192:
193:                case LONG:
194:                    return String.valueOf(_longValue);
195:
196:                case DATE:
197:                    return QDate.formatISO8601(_longValue);
198:
199:                case DOUBLE:
200:                    return String.valueOf(_doubleValue);
201:
202:                default:
203:                    throw new UnsupportedOperationException(String
204:                            .valueOf(_type));
205:                }
206:            }
207:
208:            /**
209:             * Evaluates the expression as a boolean.
210:             *
211:             * @param rows the current database tuple
212:             *
213:             * @return the boolean value
214:             */
215:            public int evalBoolean(QueryContext context) throws SQLException {
216:                switch (_type) {
217:                case NULL:
218:                    return UNKNOWN;
219:
220:                case BOOLEAN:
221:                case LONG:
222:                    return _longValue != 0 ? TRUE : FALSE;
223:
224:                case DOUBLE:
225:                    return _doubleValue != 0 ? TRUE : FALSE;
226:
227:                default:
228:                    throw new UnsupportedOperationException();
229:                }
230:            }
231:
232:            /**
233:             * Evaluates the expression as a long.
234:             *
235:             * @param rows the current database tuple
236:             *
237:             * @return the long value
238:             */
239:            public long evalLong(QueryContext context) throws SQLException {
240:                switch (_type) {
241:                case NULL:
242:                    return 0;
243:
244:                case BOOLEAN:
245:                case LONG:
246:                case DATE:
247:                    return _longValue;
248:
249:                case DOUBLE:
250:                    return (long) _doubleValue;
251:
252:                case STRING:
253:                    return Long.parseLong(_stringValue);
254:
255:                default:
256:                    throw new UnsupportedOperationException("" + _type);
257:                }
258:            }
259:
260:            /**
261:             * Evaluates the expression as a double.
262:             *
263:             * @param rows the current database tuple
264:             *
265:             * @return the double value
266:             */
267:            public double evalDouble(QueryContext context) throws SQLException {
268:                switch (_type) {
269:                case NULL:
270:                    return 0;
271:
272:                case LONG:
273:                case DATE:
274:                    return _longValue;
275:
276:                case DOUBLE:
277:                    return _doubleValue;
278:
279:                case STRING:
280:                    return Double.parseDouble(_stringValue);
281:
282:                default:
283:                    throw new UnsupportedOperationException();
284:                }
285:            }
286:
287:            /**
288:             * Evaluates the expression as a date
289:             *
290:             * @param rows the current database tuple
291:             *
292:             * @return the date value
293:             */
294:            public long evalDate(QueryContext context) throws SQLException {
295:                switch (_type) {
296:                case NULL:
297:                    return 0;
298:
299:                case LONG:
300:                case DATE:
301:                    return _longValue;
302:
303:                case DOUBLE:
304:                    return (long) _doubleValue;
305:
306:                default:
307:                    throw new UnsupportedOperationException();
308:                }
309:            }
310:
311:            /**
312:             * Evaluates the expression as a stream.
313:             *
314:             * @param rows the current database tuple
315:             *
316:             * @return the string value
317:             */
318:            public InputStream evalStream(QueryContext context)
319:                    throws SQLException {
320:                switch (_type) {
321:                case NULL:
322:                    return null;
323:
324:                case BINARY:
325:                    return _binaryStream;
326:
327:                default:
328:                    throw new UnsupportedOperationException();
329:                }
330:            }
331:
332:            public String toString() {
333:                return "?" + _index;
334:            }
335:        }
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