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---
title: JTableのPaginationとSwingWorkerでの逐次読み込み
tags: [JTable, RowFilter, SwingWorker, JButton]
author: aterai
pubdate: 2013-11-04T03:33:05+09:00
description: JTableでRowFilterを使ったPaginationとSwingWorkerでの逐次読み込みを行います。
---
* 概要 [#r9c2cffa]
`JTable`で`RowFilter`を使った`Pagination`と`SwingWorker`での逐次読み込みを行います。

#download(https://lh5.googleusercontent.com/-1qIJd4HlwkQ/UnaN9fNNZtI/AAAAAAAAB5Y/JqssphQAq3Q/s800/PageInputForPagination.png)

* サンプルコード [#wf724a96]
#code(link){{
worker = new SwingWorker<String, List<Object[]>>() {
  private int max = 2013;
  @Override public String doInBackground() {
    int current = 1;
    int c = max/itemsPerPage;
    int c = max / itemsPerPage;
    int i = 0;
    while(i<c && !isCancelled()) {
    while (i < c && !isCancelled()) {
      current = makeRowListAndPublish(current, itemsPerPage);
      i++;
    }
    int m = max%itemsPerPage;
    if(m>0) {
    int m = max % itemsPerPage;
    if (m > 0) {
      makeRowListAndPublish(current, m);
    }
    return "Done";
  }
  private int makeRowListAndPublish(int current, int size) {
    try{
    try {
      Thread.sleep(500); //dummy
    }catch(Exception ex) {
    } catch (Exception ex) {
      ex.printStackTrace();
    }
    List<Object[]> result = new ArrayList<Object[]>(size);
    int j = current;
    while(j<current+size) {
      result.add(new Object[] {j, "Test: "+j, (j%2==0)?"":"comment..."});
    while (j < current + size) {
      result.add(new Object[] {j, "Test: " + j, (j % 2 == 0) ? "" : "comment..."});
      j++;
    }
    publish(result);
    return j;
  }
  @Override protected void process(List<List<Object[]>> chunks) {
    for(List<Object[]> list: chunks) {
      for(Object[] o: list) {
    for (List<Object[]> list : chunks) {
      for (Object[] o : list) {
        model.addRow(o);
      }
    }
    int rowCount = model.getRowCount();
    maxPageIndex = (rowCount/itemsPerPage) + (rowCount%itemsPerPage==0?0:1);
    maxPageIndex = (rowCount / itemsPerPage) + (rowCount % itemsPerPage == 0 ? 0 : 1);
    initFilterAndButton();
  }
  @Override public void done() {
    String text = null;
    if(isCancelled()) {
    if (isCancelled()) {
      text = "Cancelled";
    }else{
      try{
    } else {
      try {
        text = get();
      }catch(Exception ex) {
      } catch (Exception ex) {
        ex.printStackTrace();
        text = "Exception";
      }
    }
    table.setEnabled(true);
  }
};
worker.execute();
//...
private static final int itemsPerPage = 100;
private int maxPageIndex;
private int currentPageIndex = 1;
private void initFilterAndButton() {
  sorter.setRowFilter(new RowFilter<TableModel, Integer>() {
    @Override public boolean include(
        Entry<? extends TableModel, ? extends Integer> entry) {
      Entry<? extends TableModel, ? extends Integer> entry) {
      int ti = currentPageIndex - 1;
      int ei = entry.getIdentifier();
      return ti*itemsPerPage<=ei && ei<ti*itemsPerPage+itemsPerPage;
      return ti * itemsPerPage <= ei && ei < ti * itemsPerPage + itemsPerPage;
    }
  });
  first.setEnabled(currentPageIndex>1);
  prev.setEnabled(currentPageIndex>1);
  next.setEnabled(currentPageIndex<maxPageIndex);
  last.setEnabled(currentPageIndex<maxPageIndex);
  first.setEnabled(currentPageIndex > 1);
  prev.setEnabled(currentPageIndex > 1);
  next.setEnabled(currentPageIndex < maxPageIndex);
  last.setEnabled(currentPageIndex < maxPageIndex);
  field.setText(Integer.toString(currentPageIndex));
  label.setText(String.format("/ %d", maxPageIndex));
}
}}

* 解説 [#v0e1e53f]
上記のサンプルでは、[[RowFilterでJTableのページ分割>Swing/TablePagination]]に以下の変更を追加しています。

- `JTextField`に数値を入力して指定ページにジャンプ
- `First`, `Prev`, `Next`, `Last`に`JRadioButton`ではなく、`JButton`を使用
- `SwingWorker`を使ってページ単位での逐次読み込み(最大ページの表示を更新)

* 参考リンク [#q44b2724]
- [[RowFilterでJTableのページ分割>Swing/TablePagination]]

* コメント [#d3ade240]
#comment
#comment