/*
* 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.AmberRuntimeException;
import com.caucho.amber.field.AmberField;
import com.caucho.amber.query.FromItem;
import com.caucho.amber.query.QueryParser;
import com.caucho.amber.type.BeanType;
import com.caucho.amber.type.EntityType;
import com.caucho.util.L10N;
/**
* Represents an amber mapping query expression
*/
abstract public class AbstractPathExpr extends AbstractAmberExpr
implements PathExpr {
private static final L10N L = new L10N(AbstractPathExpr.class);
/**
* Creates the expr from the path.
*/
public AmberExpr createField(QueryParser parser, String fieldName)
{
AmberField field = null;
BeanType type = getTargetType();
do {
field = type.getField(fieldName);
if (type instanceof EntityType)
type = ((EntityType) type).getParentType();
else // XXX
type = null;
}
while ((type != null) && (field == null));
if (field == null)
throw new AmberRuntimeException(L.l("'{0}' is an unknown field of '{1}' which has the following list of fields '{2}'",
fieldName, getTargetType().getName(),
getTargetType().getFields()));
return field.createExpr(parser, this);
}
/**
* Creates an array reference.
*/
public AmberExpr createArray(AmberExpr field)
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Creates an id expression.
*/
public IdExpr createId(FromItem fromItem)
{
return new CollectionIdExpr(fromItem, this);
}
/**
* Creates a load expression.
*/
public LoadExpr createLoad()
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Binds the expression as a select item.
*/
public PathExpr bindSelect(QueryParser parser, String tableName)
{
return this;
}
/**
* Binds the expression as a select item.
*/
public FromItem bindSubPath(QueryParser parser)
{
return null;
}
/**
* Returns the from item
*/
public FromItem getChildFromItem()
{
throw new UnsupportedOperationException(getClass().getName());
}
}