/*
* 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.fun;
import com.caucho.amber.expr.AmberExpr;
import com.caucho.amber.manager.AmberConnection;
import com.caucho.amber.query.QueryParser;
import com.caucho.util.CharBuffer;
import com.caucho.util.L10N;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
/**
* LOCATE function expression
*/
public class LocateFunExpr extends FunExpr {
private static final L10N L = new L10N(LocateFunExpr.class);
/**
* Creates a new expression
*/
protected LocateFunExpr(QueryParser parser,
ArrayList<AmberExpr> args)
{
super(parser, "locate", args, false);
}
public static FunExpr create(QueryParser parser,
ArrayList<AmberExpr> args)
{
return new LocateFunExpr(parser, args);
}
/**
* 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);
}
/**
* Returns the object for the expr.
*/
public Object getObject(AmberConnection aConn, ResultSet rs, int index)
throws SQLException
{
return rs.getInt(index);
}
//
// private/protected
void generateInternalWhere(CharBuffer cb,
boolean select)
{
// Translate to => POSITION('word' in SUBSTRING(data,i,LENGTH(data)))+(i-1)
ArrayList<AmberExpr> args = getArgs();
int n = args.size();
// XXX:
// if (n < 2)
// throw _parser.error(L.l("expected at least 2 string arguments for LOCATE"));
//
// if (n > 3)
// throw _parser.error(L.l("expected at most 3 arguments for LOCATE"));
if (! _parser.isPostgresDBMS()) {
// Derby (jpa/119k), MySql (ejb/0a40, jpa/119p)
cb.append("locate(");
if (select)
args.get(0).generateWhere(cb);
else
args.get(0).generateUpdateWhere(cb);
cb.append(',');
if (select)
args.get(1).generateWhere(cb);
else
args.get(1).generateUpdateWhere(cb);
if (n > 2) {
cb.append(',');
AmberExpr expr = args.get(2);
if (select)
expr.generateWhere(cb);
else
expr.generateUpdateWhere(cb);
}
cb.append(')');
return;
}
// Postgres: jpa/1190, jpa/119b, jpa/119c
cb.append("position(");
if (select)
args.get(0).generateWhere(cb);
else
args.get(0).generateUpdateWhere(cb);
cb.append(" in substring(");
if (select)
args.get(1).generateWhere(cb);
else
args.get(1).generateUpdateWhere(cb);
cb.append(" from ");
int fromIndex = 1;
AmberExpr expr = null;
if (n == 2) {
cb.append('1');
}
else {
expr = args.get(2);
try {
fromIndex = Integer.parseInt(expr.toString());
} catch (Exception ex) {
// XXX: this validation should be moved to QueryParser
// throw new QueryParseException(L.l("expected an integer for LOCATE 3rd argument"));
}
if (select)
expr.generateWhere(cb);
else
expr.generateUpdateWhere(cb);
}
cb.append("))");
}
}