Source Code Cross Referenced for JdbcEscapeTokenStream.java in  » Database-DBMS » Quadcap-Embeddable-Database » com » quadcap » sql » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.sql 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.sql;
002:
003:        /* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.io.IOException;
042:
043:        import antlr.Token;
044:        import antlr.TokenStream;
045:
046:        import com.quadcap.util.Debug;
047:
048:        /**
049:         * Handle JDBC escape processing as a token stream.
050:         *
051:         * @author Stan Bailes
052:         */
053:        public class JdbcEscapeTokenStream implements  TokenStream,
054:                SQLTokenTypes {
055:            TokenStream in;
056:            int escCnt = 0;
057:
058:            public JdbcEscapeTokenStream(TokenStream in) {
059:                this .in = in;
060:            }
061:
062:            /*{jdbcEscape.xml-10}
063:             * <section name="JDBC Escape Processing">
064:             *
065:             * <p>The following JDBC escape syntax is recognized and translated
066:             * to the appropriate underlying SQL syntax.</p>
067:             * 
068:             * <table>
069:             * <tgroup cols="3">
070:             * <thead>
071:             * <row>
072:             *  <th>JDBC Syntax</th><th>SQL Syntax</th><th>Description</th>
073:             * </row>
074:             * </thead>
075:             * <tbody>
076:             * <row>
077:             *  <entry>{escape '<i>character</i>'}</entry>
078:             *     <entry>escape '<i>character</i>'</entry>
079:             *     <entry>Specify the character used to escape '%' and '_'
080:             *         in SQL <code>LIKE</code> clauses.</entry>
081:             *
082:             * </row>
083:             * <row>
084:             *  <entry>{fn <i>functionExpression</i>}</entry>
085:             *     <entry><i>functionExpression</i></entry>
086:             *     <entry>Use a database scalar function.  Since the ODBC CLI functions
087:             *         specified by JDBC are all directly implemented by QED, this
088:             * 	       escape is basically just a pass-through.</entry>
089:             *
090:             * </row>
091:             * <row>
092:             *  <entry>{d <i>'yyyy-mm-dd'</i>}</entry>
093:             *     <entry>date <i>'yyyy-mm-dd'</i></entry>
094:             *     <entry>The JDBC 'd' escape for a date literal is translated into
095:             *	       the SQL92 'date' syntax supported by the database.</entry>
096:             *
097:             * </row>
098:             * <row>
099:             *  <entry>{t <i>'hh:mm:ss'</i>}</entry>
100:             *     <entry>time <i>'hh:mm:ss'</i></entry>
101:             *     <entry>The JDBC 't' escape for a time literal is translated into
102:             *	       the SQL92 'time' syntax supported by the database.</entry>
103:             *
104:             * </row>
105:             * <row>
106:             *  <entry>{ts <i>'yyyy-mm-dd hh:mm:ss.f . . .'</i>}</entry>
107:             *     <entry>timestamp <i>'yyyy-mm-dd hh:mm:ss.f . . .'</i></entry>
108:             *     <entry>The JDBC 'ts' escape for a timestamp literal is translated into
109:             *	       the SQL92 'timestamp' syntax supported by the database.</entry>
110:             *
111:             * </row>
112:             * <row>
113:             *  <entry>{oj <i>outer-join</i>}</entry>
114:             *     <entry><i>outer-join</i></entry>
115:             *     <entry>The JDBC 'oj' escape for a timestamp literal is translated into
116:             *	       the SQL92 'outer join' syntax supported by the database.</entry>
117:             *
118:             * </row>
119:             * </tbody>
120:             * </tgroup>
121:             * </table>
122:             * </section>
123:             */
124:
125:            public Token nextToken() throws antlr.TokenStreamException {
126:                Token t = in.nextToken();
127:                int typ = t.getType();
128:                while (typ == RCURLY) {
129:                    if (--escCnt < 0)
130:                        throw new antlr.TokenStreamException("unexpected '}'");
131:                    t = in.nextToken();
132:                    typ = t.getType();
133:                }
134:                if (typ == LCURLY) {
135:                    escCnt++;
136:                    t = in.nextToken();
137:                    typ = t.getType();
138:                    if (typ == ID) {
139:                        String txt = t.getText().toLowerCase();
140:                        if (txt.equals("fn") || txt.equals("oj")) {
141:                            t = in.nextToken();
142:                        } else if (txt.equals("escape")) {
143:                        } else if (txt.equals("d")) {
144:                            t = new Token(LITERAL_date, "date");
145:                        } else if (txt.equals("t")) {
146:                            t = new Token(LITERAL_time, "time");
147:                        } else if (txt.equals("ts")) {
148:                            t = new Token(LITERAL_timestamp, "timestamp");
149:                        } else {
150:                            throw new antlr.TokenStreamException(
151:                                    "Unrecognized escape: " + t.getText());
152:                        }
153:                    }
154:                }
155:                //Debug.println("ESC token = " + t);
156:                return t;
157:            }
158:        }
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