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/*
* 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.criterion;
import org.hibernate.type.Type;
/**
* The criterion package may be used by applications as a framework for building
* new kinds of Projection. However, it is intended that most applications will
* simply use the built-in projection types via the static factory methods of this class.
*
* The factory methods that take an alias allow the projected value to be referred to by
* criterion and order instances.
*
* @see org.hibernate.Criteria
* @see Restrictions factory methods for Criterion instances
* @author Gavin King
*/
public final class Projections {
private Projections() {
//cannot be instantiated
}
/**
* Create a distinct projection from a projection
*/
public static Projection distinct(Projection proj) {
return new Distinct(proj);
}
/**
* Create a new projection list
*/
public static ProjectionList projectionList() {
return new ProjectionList();
}
/**
* The query row count, ie. count(*)
*/
public static Projection rowCount() {
return new RowCountProjection();
}
/**
* A property value count
*/
public static CountProjection count(String propertyName) {
return new CountProjection(propertyName);
}
/**
* A distinct property value count
*/
public static CountProjection countDistinct(String propertyName) {
return new CountProjection(propertyName).setDistinct();
}
/**
* A property maximum value
*/
public static AggregateProjection max(String propertyName) {
return new AggregateProjection("max", propertyName);
}
/**
* A property minimum value
*/
public static AggregateProjection min(String propertyName) {
return new AggregateProjection("min", propertyName);
}
/**
* A property average value
*/
public static AggregateProjection avg(String propertyName) {
return new AvgProjection(propertyName);
}
/**
* A property value sum
*/
public static AggregateProjection sum(String propertyName) {
return new AggregateProjection("sum", propertyName);
}
/**
* A SQL projection, a typed select clause fragment
*/
public static Projection sqlProjection(String sql, String[] columnAliases, Type[] types) {
return new SQLProjection(sql, columnAliases, types);
}
/**
* A grouping SQL projection, specifying both select clause and group by clause fragments
*/
public static Projection sqlGroupProjection(String sql, String groupBy, String[] columnAliases, Type[] types) {
return new SQLProjection(sql, groupBy, columnAliases, types);
}
/**
* A grouping property value
*/
public static PropertyProjection groupProperty(String propertyName) {
return new PropertyProjection(propertyName, true);
}
/**
* A projected property value
*/
public static PropertyProjection property(String propertyName) {
return new PropertyProjection(propertyName);
}
/**
* A projected identifier value
*/
public static IdentifierProjection id() {
return new IdentifierProjection();
}
/**
* Assign an alias to a projection, by wrapping it
*/
public static Projection alias(Projection projection, String alias) {
return new AliasedProjection(projection, alias);
}
}
