com.mg.framework.api.orm.Projections.java Source code

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Here is the source code for com.mg.framework.api.orm.Projections.java

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/*
 * Projections.java
 *
 * Copyright (c) 1998 - 2005 BusinessTechnology, Ltd.
 * All rights reserved
 *
 * This program is the proprietary and confidential information
 * of BusinessTechnology, Ltd. and may be used and disclosed only
 * as authorized in a license agreement authorizing and
 * controlling such use and disclosure
 *
 * Millennium ERP system.
 *
 */
package com.mg.framework.api.orm;

import com.mg.framework.support.orm.GenericProjectionImpl;

import org.hibernate.criterion.ProjectionList;

/**
 *  ??   
 *
 * @author Oleg V. Safonov
 * @version $Id: Projections.java,v 1.2 2006/12/12 13:54:52 safonov Exp $
 */
public final class Projections {

    /**
     * Assign an alias to a projection, by wrapping it
     */
    public static Projection alias(Projection projection, String alias) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections
                .alias(((GenericProjectionImpl) projection).getHibernateProjection(), alias));
    }

    /**
     * A projected property value
     */
    public static Projection property(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.property(propertyName));
    }

    /**
     * Create a distinct projection from a projection
     */
    public static Projection distinct(Projection proj) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections
                .distinct(((GenericProjectionImpl) proj).getHibernateProjection()));
    }

    /**
     * A property maximum value
     */
    public static Projection max(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.max(propertyName));
    }

    /**
     * A property minimum value
     */
    public static Projection min(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.min(propertyName));
    }

    /**
     * A property average value
     */
    public static Projection avg(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.avg(propertyName));
    }

    /**
     * A property value sum
     */
    public static Projection sum(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.sum(propertyName));
    }

    /**
     * A grouping property value
     */
    public static Projection groupProperty(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.groupProperty(propertyName));
    }

    /**
     * A property value count
     */
    public static Projection count(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.count(propertyName));
    }

    /**
     * A distinct property value count
     */
    public static Projection countDistinct(String propertyName) {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.countDistinct(propertyName));
    }

    /**
     * The query row count, ie. <tt>count(*)</tt>
     */
    public static Projection rowCount() {
        return new GenericProjectionImpl(org.hibernate.criterion.Projections.rowCount());
    }

    /**
     * Create a new projection list
     */
    public static Projection projectionList(Projection... projections) {
        ProjectionList list = org.hibernate.criterion.Projections.projectionList();
        for (Projection projection : projections)
            list.add(((GenericProjectionImpl) projection).getHibernateProjection());
        return new GenericProjectionImpl(list);
    }

}