/*
* 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.field.AmberField;
import com.caucho.amber.query.FromItem;
import com.caucho.amber.query.QueryParseException;
import com.caucho.amber.query.QueryParser;
import com.caucho.amber.type.EntityType;
import com.caucho.util.L10N;
/**
* Represents a collection from a from-item table.
*/
public class ManyToOneSchemaExpr extends SchemaExpr {
private static final L10N L = new L10N(CollectionSchemaExpr.class);
private ManyToOneExpr _expr;
private String _name;
/**
* Creates the collection schema.
*/
public ManyToOneSchemaExpr(ManyToOneExpr expr, String name)
{
_expr = expr;
_name = name;
}
/**
* Returns the tail name.
*/
public String getTailName()
{
return _name;
}
/**
* Creates a field-based schema.
*/
public SchemaExpr createField(QueryParser parser, String name)
throws QueryParseException
{
EntityType type = _expr.getTargetType();
AmberField field = type.getField(name);
if (field == null)
throw parser.error(L.l("{0}: '{1}' is an unknown field.",
type.getBeanClass().getName(),
name));
AmberExpr fieldExpr = _expr.createField(parser, name);
if (fieldExpr instanceof ManyToOneExpr)
return new ManyToOneSchemaExpr((ManyToOneExpr) fieldExpr, name);
/*
else if (fieldExpr instanceof ManyToManyExpr)
return new ManyToManySchemaExpr((ManyToManyExpr) fieldExpr);
*/
else if (fieldExpr instanceof OneToManyExpr)
return new OneToManySchemaExpr((OneToManyExpr) fieldExpr);
throw parser.error(L.l("{0}: '{1}' must be a collection.",
type.getBeanClass().getName(),
name));
}
/**
* Adds the from item.
*/
public FromItem addFromItem(QueryParser parser, String id)
throws QueryParseException
{
_expr = (ManyToOneExpr) _expr.bindSelect(parser, id);
FromItem fromItem = _expr.bindSubPath(parser);
return fromItem;
}
}