/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.criterion;
import org.hibernate.Criteria;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.type.Type;
/**
* A property value, or grouped property value
*
* @author Gavin King
*/
public class IdentifierProjection extends SimpleProjection {
private boolean grouped;
/**
* Constructs a non-grouped identifier projection
*
* @see Projections#id
*/
protected IdentifierProjection() {
this( false );
}
/**
*
* Not used externally
*/
private IdentifierProjection(boolean grouped) {
this.grouped = grouped;
}
@Override
public Type[] getTypes(Criteria criteria, CriteriaQuery criteriaQuery) {
return new Type[] { criteriaQuery.getIdentifierType( criteria ) };
}
@Override
public String toSqlString(Criteria criteria, int position, CriteriaQuery criteriaQuery) {
final StringBuilder buf = new StringBuilder();
final String[] cols = criteriaQuery.getIdentifierColumns( criteria );
for ( int i=0; i<cols.length; i++ ) {
buf.append( cols[i] )
.append( " as y" )
.append( position + i )
.append( '_' );
if ( i < cols.length -1 ) {
buf.append( ", " );
}
}
return buf.toString();
}
@Override
public boolean isGrouped() {
return grouped;
}
@Override
public String toGroupSqlString(Criteria criteria, CriteriaQuery criteriaQuery) {
if ( !grouped ) {
return super.toGroupSqlString( criteria, criteriaQuery );
}
else {
return StringHelper.join( ", ", criteriaQuery.getIdentifierColumns( criteria ) );
}
}
@Override
public String toString() {
return "id";
}
}