/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.amber.expr;
import com.caucho.amber.query.FromItem;
import com.caucho.amber.query.QueryParser;
import com.caucho.amber.type.BooleanType;
import com.caucho.amber.type.AmberType;
import com.caucho.util.CharBuffer;
/**
* Bound identifier expression.
*/
public class LikeExpr extends AbstractAmberExpr {
private AmberExpr _expr;
private AmberExpr _value;
private String _escape;
private boolean _isNot;
/**
* Creates a new cmp expression
*/
public LikeExpr(AmberExpr expr,
AmberExpr value,
String escape,
boolean isNot)
{
_expr = expr;
_value = value;
_isNot = isNot;
_escape = escape;
}
/**
* Returns true for a boolean expression.
*/
public boolean isBoolean()
{
return true;
}
/**
* Returns the expr type.
*/
public AmberType getType()
{
return BooleanType.create();
}
/**
* Binds the expression as a select item.
*/
public AmberExpr bindSelect(QueryParser parser)
{
_expr = _expr.bindSelect(parser);
_value = _value.bindSelect(parser);
return this;
}
/**
* Returns true if the expression uses the from item.
*/
public boolean usesFrom(FromItem from, int type, boolean isNot)
{
return (_expr.usesFrom(from, type));
}
/**
* Returns true if the expression uses the from item.
*/
public AmberExpr replaceJoin(JoinExpr join)
{
_expr = _expr.replaceJoin(join);
_value = _value.replaceJoin(join);
return this;
}
/**
* Generates the where expression.
*/
public void generateWhere(CharBuffer cb)
{
generateInternalWhere(cb, true);
}
/**
* Generates the (update) where expression.
*/
public void generateUpdateWhere(CharBuffer cb)
{
generateInternalWhere(cb, false);
}
/**
* Generates the having expression.
*/
public void generateHaving(CharBuffer cb)
{
generateWhere(cb);
}
public String toString()
{
CharBuffer cb = CharBuffer.allocate();
cb.append('(');
cb.append(_expr);
if (_isNot)
cb.append(" NOT");
cb.append(" LIKE ");
cb.append(_value);
cb.append(')');
return cb.close();
}
//
// private
private void generateInternalWhere(CharBuffer cb,
boolean select)
{
cb.append('(');
if (select)
_expr.generateWhere(cb);
else
_expr.generateUpdateWhere(cb);
if (_isNot)
cb.append(" NOT");
cb.append(" LIKE ");
if (select)
_value.generateWhere(cb);
else
_value.generateUpdateWhere(cb);
if (_escape != null) {
cb.append(" ESCAPE ");
cb.append(_escape);
}
cb.append(')');
}
}