com.clickntap.utils.Pager Maven / Gradle / Ivy

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Stripecube is an open source Java framework for Web Applications
There is a newer version: 1.30
package com.clickntap.utils;

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

public class Pager implements Serializable {

    private int pageNumber;

    private int numberOfLinks;

    private int numberOfRows;

    private List page;

    private int numberOfPages;

    private int size;

    private int fromRow;

    private int toRow;

    public Pager(int numberOfLinks, int numberOfRows) {
        this.pageNumber = 1;
        this.numberOfLinks = numberOfLinks > 0 ? numberOfLinks : 5;
        this.numberOfRows = numberOfRows > 0 ? numberOfRows : 5;
    }

    public Pager selectPage(List list, int pageNumber) throws Exception {
        this.pageNumber = pageNumber > 0 ? pageNumber : 1;
        size = (list != null ? list.size() : 0);
        numberOfPages = size / numberOfRows;
        if (size % numberOfRows > 0)
            numberOfPages++;
        if (pageNumber > numberOfPages)
            pageNumber = numberOfPages;
        fromRow = ((pageNumber - 1) * numberOfRows);
        toRow = fromRow + numberOfRows;
        if (toRow >= size)
            toRow = size;
        if (fromRow < 0)
            fromRow = 0;
        if (list != null)
            page = list.subList(fromRow, toRow);
        return this;
    }

    public List getLinks() {
        List links = new ArrayList();

        int s, e;
        int m = (numberOfLinks / 2);

        if (pageNumber > numberOfPages - m) {
            e = numberOfPages;
            s = e - numberOfLinks + 1;
            if (s < 1)
                s = 1;
        } else {
            s = pageNumber - m;
            if (s < 1)
                s = 1;
            e = s + numberOfLinks - 1;
            if (e > numberOfPages)
                e = numberOfPages;
        }

        for (int i = s; i <= e; i++)
            links.add(i);

        return links;
    }

    public List getPage() {
        return page;
    }

    public int getLastPage() {
        return getNumberOfPages();
    }

    public int getNumberOfPages() {
        return numberOfPages;
    }

    public int getFromRow() {
        return fromRow;
    }

    public int getToRow() {
        return toRow - 1;
    }

    public int getPageNumber() {
        return pageNumber;
    }

    public void setPageNumber(int pageNumber) {
        this.pageNumber = pageNumber;
    }

    public boolean isFirst() {
        return pageNumber == 1;
    }

    public boolean isLast() {
        return pageNumber == numberOfPages || size == 0;
    }

    public int getPrevPage() {
        return (!isFirst() ? pageNumber - 1 : 1);
    }

    public int getNextPage() {
        return (!isLast() ? pageNumber + 1 : numberOfPages);
    }

    public int getSize() {
        return size;
    }

    public void refreshList(List list) throws Exception {
        selectPage(list, getPageNumber());
    }

}