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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, 2013, Red Hat Inc. 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 Inc.
*
* 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 also the {@link Restrictions} factory methods for generating {@link Criterion} instances
*
* @author Gavin King
* @author Steve Ebersole
*
* @see org.hibernate.Criteria
*/
public final class Projections {
/**
* A property value projection
*
* @param propertyName The name of the property whose values should be projected
*
* @return The property projection
*
* @see PropertyProjection
*/
public static PropertyProjection property(String propertyName) {
return new PropertyProjection( propertyName );
}
/**
* A grouping property value projection
*
* @param propertyName The name of the property to group
*
* @return The grouped projection
*
* @see PropertyProjection
*/
public static PropertyProjection groupProperty(String propertyName) {
return new PropertyProjection( propertyName, true );
}
/**
* An identifier value projection.
*
* @return The identifier projection
*
* @see IdentifierProjection
*/
public static IdentifierProjection id() {
return new IdentifierProjection();
}
/**
* Create a distinct projection from a projection.
*
* @param projection The project to treat distinctly
*
* @return The distinct projection
*
* @see Distinct
*/
public static Projection distinct(Projection projection) {
return new Distinct( projection );
}
/**
* Create a new projection list.
*
* @return The projection list
*/
public static ProjectionList projectionList() {
return new ProjectionList();
}
/**
* The query row count, ie. count(*)
*
* @return The projection representing the row count
*
* @see RowCountProjection
*/
public static Projection rowCount() {
return new RowCountProjection();
}
/**
* A property value count projection
*
* @param propertyName The name of the property to count over
*
* @return The count projection
*
* @see CountProjection
*/
public static CountProjection count(String propertyName) {
return new CountProjection( propertyName );
}
/**
* A distinct property value count projection
*
* @param propertyName The name of the property to count over
*
* @return The count projection
*
* @see CountProjection
*/
public static CountProjection countDistinct(String propertyName) {
return new CountProjection( propertyName ).setDistinct();
}
/**
* A property maximum value projection
*
* @param propertyName The property for which to find the max
*
* @return the max projection
*
* @see AggregateProjection
*/
public static AggregateProjection max(String propertyName) {
return new AggregateProjection( "max", propertyName );
}
/**
* A property minimum value projection
*
* @param propertyName The property for which to find the min
*
* @return the min projection
*
* @see AggregateProjection
*/
public static AggregateProjection min(String propertyName) {
return new AggregateProjection( "min", propertyName );
}
/**
* A property average value projection
*
* @param propertyName The property over which to find the average
*
* @return the avg projection
*
* @see AvgProjection
*/
public static AggregateProjection avg(String propertyName) {
return new AvgProjection( propertyName );
}
/**
* A property value sum projection
*
* @param propertyName The property over which to sum
*
* @return the sum projection
*
* @see AggregateProjection
*/
public static AggregateProjection sum(String propertyName) {
return new AggregateProjection( "sum", propertyName );
}
/**
* Assign an alias to a projection, by wrapping it
*
* @param projection The projection to be aliased
* @param alias The alias to apply
*
* @return The aliased projection
*
* @see AliasedProjection
*/
public static Projection alias(Projection projection, String alias) {
return new AliasedProjection( projection, alias );
}
/**
* A SQL projection, a typed select clause fragment
*
* @param sql The SQL fragment
* @param columnAliases The column aliases
* @param types The resulting types
*
* @return The SQL projection
*
* @see SQLProjection
*/
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
*
* @param sql The SQL SELECT fragment
* @param groupBy The SQL GROUP BY fragment
* @param columnAliases The column aliases
* @param types The resulting types
*
* @return The SQL projection
*
* @see SQLProjection
*/
@SuppressWarnings("UnusedDeclaration")
public static Projection sqlGroupProjection(String sql, String groupBy, String[] columnAliases, Type[] types) {
return new SQLProjection(sql, groupBy, columnAliases, types);
}
private Projections() {
//cannot be instantiated
}
}
