/*
* 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.entity.Entity;
import com.caucho.amber.entity.EntityItem;
import com.caucho.amber.field.AmberField;
import com.caucho.amber.manager.AmberConnection;
import com.caucho.amber.query.FromItem;
import com.caucho.amber.query.QueryParser;
import com.caucho.amber.table.LinkColumns;
import com.caucho.amber.table.AmberTable;
import com.caucho.amber.type.EntityType;
import com.caucho.amber.type.AmberType;
import com.caucho.util.CharBuffer;
import com.caucho.util.L10N;
import java.lang.reflect.Method;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* An entity expression which should be loaded.
*/
public class LoadEntityExpr extends LoadExpr {
private static final L10N L = new L10N(LoadEntityExpr.class);
private static final Logger log
= Logger.getLogger(LoadEntityExpr.class.getName());
LoadEntityExpr(PathExpr expr)
{
super(expr);
}
/**
* Returns the entity type.
*/
public EntityType getEntityType()
{
return (EntityType) getType();
}
/**
* Binds the expression as a select item.
*/
public AmberExpr bindSelect(QueryParser parser)
{
_fromItem = _expr.bindSubPath(parser);
if (_fromItem == null)
throw new NullPointerException(_expr.getClass().getName() + " " + _expr);
EntityType type = getEntityType();
if (type.getSecondaryTables().size() > 0) {
for (AmberField field : type.getFields()) {
AmberTable subTable = field.getTable();
if (subTable != null && subTable != type.getTable()) {
LinkColumns link = subTable.getDependentIdLink();
FromItem item = parser.createDependentFromItem(_fromItem, link);
_subItems.add(item);
}
}
}
return this;
}
/**
* Returns the object for the expr.
*/
public Object getObject(AmberConnection aConn, ResultSet rs, int index)
throws SQLException
{
return getEntityType().getLoadObject(aConn, rs, index);
}
/**
* Returns the object for the expr.
*/
public Object getCacheObject(AmberConnection aConn,
ResultSet rs,
int index)
throws SQLException
{
return getCacheObject(aConn, rs, index, null);
}
/**
* Returns the object for the expr.
*/
public Object getCacheObject(AmberConnection aConn,
ResultSet rs,
int index,
Map<AmberExpr, String> joinFetchMap)
throws SQLException
{
return findItem(aConn, rs, index, joinFetchMap);
}
/**
* Returns the object for the expr.
*/
public EntityItem findItem(AmberConnection aConn,
ResultSet rs,
int index)
throws SQLException
{
return findItem(aConn, rs, index, null);
}
/**
* Returns the object for the expr.
*/
public EntityItem findItem(AmberConnection aConn,
ResultSet rs,
int index,
Map<AmberExpr, String> joinFetchMap)
throws SQLException
{
// jpa/0h13, jpa/1160
EntityType entityType = getEntityType();
EntityItem item = entityType.getHome().findItem(aConn, rs, index);
if (item == null)
return null;
int offset = entityType.getId().getKeyCount();
Entity entity = item.getEntity();
/* XXX: jpa/0s2c
if (entityType.getDiscriminator() != null) {
// jpa/0l47
offset++;
}
*/
_index = entity.__caucho_load(aConn, rs, index + offset);
item.setNumberOfLoadingColumns(_index);
return item;
}
}