com.npower.dm.hibernate.management.PaginatedResultImpl4Criteria.java Source code

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Here is the source code for com.npower.dm.hibernate.management.PaginatedResultImpl4Criteria.java

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/**
 * $Header: /home/master/nWave-DM-Common/src/com/npower/dm/hibernate/management/PaginatedResultImpl4Criteria.java,v 1.2 2008/08/27 03:58:55 zhao Exp $
 * $Revision: 1.2 $
 * $Date: 2008/08/27 03:58:55 $
 *
 * ===============================================================================================
 * License, Version 1.1
 *
 * Copyright (c) 1994-2007 NPower Network Software Ltd.  All rights reserved.
 *
 * This SOURCE CODE FILE, which has been provided by NPower as part
 * of a NPower product for use ONLY by licensed users of the product,
 * includes CONFIDENTIAL and PROPRIETARY information of NPower.
 *
 * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
 * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
 * THE PRODUCT.
 *
 * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD NPower, ITS RELATED
 * COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY CLAIMS
 * OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR DISTRIBUTION
 * OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES ARISING OUT OF
 * OR RESULTING FROM THE USE, MODIFICATION, OR DISTRIBUTION OF PROGRAMS
 * OR FILES CREATED FROM, BASED ON, AND/OR DERIVED FROM THIS SOURCE
 * CODE FILE.
 * ===============================================================================================
 */
package com.npower.dm.hibernate.management;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.criterion.CriteriaSpecification;
import org.hibernate.criterion.Projection;
import org.hibernate.criterion.Projections;
import org.hibernate.impl.CriteriaImpl;
import org.hibernate.impl.CriteriaImpl.OrderEntry;

import com.npower.dm.management.PaginatedResult;
import com.npower.dm.util.BeanHelper;

/**
 * @author Zhao DongLu
 * @version $Revision: 1.2 $ $Date: 2008/08/27 03:58:55 $
 */
public class PaginatedResultImpl4Criteria extends AbstractPaginatedResult implements PaginatedResult {

    protected Criteria criteria = null;

    /**
     * 
     */
    protected PaginatedResultImpl4Criteria() {
        super();
    }

    /**
     * 
     */
    public PaginatedResultImpl4Criteria(Criteria criteria, int pageNumber, int objectsPerPage) {
        super(pageNumber, objectsPerPage);
        this.setCriteria(criteria);
        // Load Data
        this.load();
    }

    public Criteria getCriteria() {
        return criteria;
    }

    /**
     * @param criteria
     *          the criteria to set
     */
    public void setCriteria(Criteria criteria) {
        this.criteria = criteria;
    }

    // protected methods
    // ------------------------------------------------------------------------------------
    protected void load() {
        // http://www.blogjava.net/iamtin/archive/2006/06/06/50702.aspx
        // ProjectionOrderBy,Count
        CriteriaImpl impl = (CriteriaImpl) this.criteria;
        Projection projection = impl.getProjection();
        List<OrderEntry> orderEntries;
        try {
            orderEntries = (List<OrderEntry>) BeanHelper.getPrivateProperty(impl, "orderEntries");
            BeanHelper.setPrivateProperty(impl, "orderEntries", new ArrayList<OrderEntry>());
        } catch (Exception e) {
            throw new InternalError(" Runtime Exception impossibility throw ");
        }
        // Execute and get query for counting.
        Projection project4Count = Projections.rowCount();
        this.fullListSize = (Integer) criteria.setProjection(project4Count).uniqueResult();

        // ProjectionOrderBy
        criteria.setProjection(projection);
        if (projection == null) {
            criteria.setResultTransformer(CriteriaSpecification.ROOT_ENTITY);
            // DISTINCT_ROOT_ENTITY, 
            // DISTINCT_ROOT_ENTITY , , . 
            //criteria.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY);
        }

        try {
            BeanHelper.setPrivateProperty(impl, "orderEntries", orderEntries);
        } catch (Exception e) {
            throw new InternalError("Runtime Exception impossibility throw ");
        }
        int firstResult = this.getObjectsPerPage() * (this.getPageNumber() - 1);
        criteria.setFirstResult(firstResult);
        criteria.setMaxResults(this.getObjectsPerPage());
        this.results = criteria.list();

        // Load Records
        // criteria.setProjection(null);
        // int firstResult = this.getObjectsPerPage() * (this.getPageNumber() - 1);
        // criteria.setFirstResult(firstResult);
        // criteria.setMaxResults(this.getObjectsPerPage());
        // this.results = criteria.list();

        // Countting records
        // criteria.setProjection(Projections.rowCount());
        // 
        // criteria.setFirstResult(0);
        // criteria.setMaxResults(Integer.MAX_VALUE);
        // this.fullListSize = ((Integer)criteria.list().get(0)).intValue();
    }

}