Source Code Cross Referenced for LikeExpr.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » ejb » ql » 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.ejb.ql 
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 SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.ejb.ql;
030:
031:        import com.caucho.config.ConfigException;
032:        import com.caucho.util.CharBuffer;
033:
034:        /**
035:         * A like expression
036:         */
037:        class LikeExpr extends Expr {
038:            // value expression
039:            private Expr _value;
040:            // match pattern
041:            private Expr _pattern;
042:            // escape string
043:            private String _escape;
044:            // true if this is a negative between
045:            private boolean _isNot;
046:
047:            /**
048:             * Creates a like expression.
049:             *
050:             * @param value the value expression
051:             * @param pattern the matching pattern
052:             * @param escape the escape pattern
053:             * @param isNot if true, this the like is negated
054:             */
055:            LikeExpr(Expr value, Expr pattern, String escape, boolean isNot)
056:                    throws ConfigException {
057:                _value = value;
058:                _pattern = pattern;
059:                _escape = escape;
060:                _isNot = isNot;
061:
062:                evalTypes();
063:            }
064:
065:            /**
066:             * Evaluates the types for the expression
067:             */
068:            void evalTypes() throws ConfigException {
069:                if (getJavaType() != null)
070:                    return;
071:
072:                if (!_value.isString())
073:                    throw error(L.l(
074:                            "LIKE value `{0}' must be a string expression",
075:                            _value));
076:
077:                if (!_pattern.isString())
078:                    throw error(L.l(
079:                            "LIKE pattern `{0}' must be a string expression.",
080:                            _pattern));
081:
082:                setJavaType(boolean.class);
083:            }
084:
085:            /**
086:             * Prints the where SQL for this expression
087:             *
088:             * @param gen the java code generator
089:             */
090:            void generateWhere(CharBuffer cb) {
091:                _value.generateWhereSubExpr(cb);
092:
093:                if (_isNot)
094:                    cb.append(" NOT LIKE ");
095:                else
096:                    cb.append(" LIKE ");
097:
098:                _pattern.generateWhereSubExpr(cb);
099:
100:                if (_escape != null) {
101:                    cb.append(" ESCAPE ");
102:                    cb.append(_escape);
103:                }
104:            }
105:
106:            public String toString() {
107:                String not = _isNot ? "NOT " : "";
108:
109:                if (_escape != null)
110:                    return not + _pattern + " ESCAPE " + _escape;
111:                else
112:                    return not + _pattern;
113:            }
114:        }
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