com.farmafene.commons.hibernate.HBPaginaFactory.java Source code

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Here is the source code for com.farmafene.commons.hibernate.HBPaginaFactory.java

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/*
 * Copyright (c) 2009-2014 farmafene.com
 * All rights reserved.
 * 
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 * 
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 * 
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.farmafene.commons.hibernate;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.hibernate.ScrollableResults;

/**
 * Factora de listas
 * 
 * @author vlopez
 * @since 1.0.0
 * @version 1.0.0
 * 
 * @param <T>
 */
public class HBPaginaFactory<T extends Serializable> {

    private HBSrollableResultReaderHandler<T> handler;

    /**
     * {@inheritDoc}
     * 
     * @since 1.0.0
     */
    class HBPaginaImp implements HBPagina<T> {

        private int first;
        private int pageSize;
        private List<T> lista;
        private int totalSize;

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public HBPaginaImp() {
            lista = new ArrayList<T>();
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        @Override
        public String toString() {
            StringBuilder sb = new StringBuilder();
            sb.append(getClass().getSimpleName());
            sb.append("={");
            sb.append("desde=").append(getFirst());
            sb.append(", hasta=").append(getLast());
            sb.append(", de=").append(getTotalSize());
            sb.append("}");
            return sb.toString();

        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public int getFirst() {
            return first;
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public int getLast() {
            return (lista.size() == 0) ? 0 : first - 1 + lista.size();
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public List<T> getLista() {
            return lista;
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public int getNumRegistros() {
            return lista.size();
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public int getPageSize() {
            return pageSize;
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public int getTotalSize() {
            return totalSize;
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public void setFirst(int first) {
            this.first = first;
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public void setPageSize(int pageSize) {
            this.pageSize = pageSize;
        }

        /**
         * {@inheritDoc}
         * 
         * @since 1.0.0
         */
        public void setTotalSize(int totalSize) {
            this.totalSize = totalSize;
        }

    }

    /**
     * Constructor por defecto
     * 
     * @since 1.0.0
     */
    public HBPaginaFactory() {
        this(new HBSrollableResultReaderHandler<T>() {

            @SuppressWarnings("unchecked")
            public T makeObject(Object[] objects) {
                T salida = null;
                if (objects != null) {

                    salida = (T) objects[0];
                }
                return salida;
            }
        });

    }

    /**
     * Constructor con handler
     * 
     * @param handler
     *            handler que manejar la salida
     * @since 1.0.0
     */
    public HBPaginaFactory(HBSrollableResultReaderHandler<T> handler) {
        this.handler = handler;
    }

    /**
     * {@inheritDoc}
     * 
     * @since 1.0.0
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getSimpleName());
        sb.append("={");
        // TODO !!
        sb.append("}");
        return sb.toString();

    }

    /**
     * Metodo factora
     * 
     * @param begin
     *            primer registro
     * @param size
     *            tamao pgina
     * @param result
     *            dnde buscar
     * @return pgina generada
     * @since 1.0.0
     */
    public HBPagina<T> getPagina(int begin, int size, ScrollableResults result) {
        HBPaginaImp lista = new HBPaginaImp();
        if (lista.getFirst() < 1) {
            lista.setFirst(1);
        }
        if (lista.getPageSize() < 0) {
            lista.setPageSize(0);
        }
        result.beforeFirst();
        result.scroll(lista.getFirst() - 1);
        for (int i = 0; result.next() && (lista.getPageSize() == 0 || i < lista.getPageSize()); i++) {
            T obj = handler.makeObject(result.get());
            if (obj != null) {
                lista.getLista().add(obj);
            }
        }
        if (result.last()) {
            lista.setTotalSize(result.getRowNumber() + 1);
        } else {
            lista.setTotalSize(0);
            lista.setFirst(0);
        }
        return lista;
    }
}