/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.sql;
import java.util.Iterator;
import java.util.Map;
import org.hibernate.LockMode;
import org.hibernate.QueryException;
import org.hibernate.dialect.Dialect;
import org.hibernate.util.StringHelper;
/**
* @author Gavin King
*/
public class ForUpdateFragment {
private final StringBuffer aliases = new StringBuffer();
private boolean isNowaitEnabled;
private final Dialect dialect;
public ForUpdateFragment(Dialect dialect) {
this.dialect = dialect;
}
public ForUpdateFragment(Dialect dialect, Map lockModes, Map keyColumnNames) throws QueryException {
this( dialect );
LockMode upgradeType = null;
Iterator iter = lockModes.entrySet().iterator();
while ( iter.hasNext() ) {
final Map.Entry me = ( Map.Entry ) iter.next();
final LockMode lockMode = ( LockMode ) me.getValue();
if ( LockMode.READ.lessThan( lockMode ) ) {
final String tableAlias = ( String ) me.getKey();
if ( dialect.forUpdateOfColumns() ) {
String[] keyColumns = ( String[] ) keyColumnNames.get( tableAlias ); //use the id column alias
if ( keyColumns == null ) {
throw new IllegalArgumentException( "alias not found: " + tableAlias );
}
keyColumns = StringHelper.qualify( tableAlias, keyColumns );
for ( int i = 0; i < keyColumns.length; i++ ) {
addTableAlias( keyColumns[i] );
}
}
else {
addTableAlias( tableAlias );
}
if ( upgradeType != null && lockMode != upgradeType ) {
throw new QueryException( "mixed LockModes" );
}
upgradeType = lockMode;
}
}
if ( upgradeType == LockMode.UPGRADE_NOWAIT ) {
setNowaitEnabled( true );
}
}
public ForUpdateFragment addTableAlias(String alias) {
if ( aliases.length() > 0 ) {
aliases.append( ", " );
}
aliases.append( alias );
return this;
}
public String toFragmentString() {
if ( aliases.length() == 0 ) {
return "";
}
return isNowaitEnabled ?
dialect.getForUpdateNowaitString( aliases.toString() ) :
dialect.getForUpdateString( aliases.toString() );
}
public ForUpdateFragment setNowaitEnabled(boolean nowait) {
isNowaitEnabled = nowait;
return this;
}
}