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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