datapage.java

JSF分页控件。真正实现了大容量数据可查询的分页。原创。

package com.m2.jsf.pagination;

import java.util.List;

/**
 * A simple class that represents a "page" of data out of a longer set, ie
 * a list of objects together with info to indicate the starting row and
 * the full size of the dataset. EJBs can return instances of this type
 * when returning subsets of available data.
 */
public class DataPage {

  private int datasetSize;
  private int startRow;
  private List data;
        
  /**
   * Create an object representing a sublist of a dataset.
   * 
   * @param datasetSize is the total number of matching rows
   * available.
   * 
   * @param startRow is the index within the complete dataset
   * of the first element in the data list.
   * 
   * @param data is a list of consecutive objects from the
   * dataset.
   */
  public DataPage(int datasetSize, int startRow, List data) {
    this.datasetSize = datasetSize;
    this.startRow = startRow;
    this.data = data;
  }

  /**
   * Return the number of items in the full dataset.
   */
  public int getDatasetSize() {
    return datasetSize;
  }

  /**
   * Return the offset within the full dataset of the first
   * element in the list held by this object.
   */
  public int getStartRow() {
    return startRow;
  }

  /**
   * Return the list of objects held by this object, which
   * is a continuous subset of the full dataset.
   */
  public List getData() {
    return data;
  }
}