tablesorter.java

Java中Swing界面库中几个类使用的例子

/* (swing1.1) */
package jp.gr.java_conf.tame.swing.table;

import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;


/**
 * @version 1.0 02/25/99
 */
public class TableSorter {
  SortableTableModel model;

  public TableSorter(SortableTableModel model) {
    this.model = model;
  }
  
  
  //n2 selection
  public void sort(int column, boolean isAscent) {   
    int n = model.getRowCount();
    int[] indexes = model.getIndexes();   
    
    for (int i=0; i<n-1; i++) {
      int k = i;
      for (int j=i+1; j<n; j++) {
        if (isAscent) {
          if (compare(column, j, k) < 0) {
            k = j;
          }
        } else {
          if (compare(column, j, k) > 0) {
            k = j;
          }
        }
      }
      int tmp = indexes[i];
      indexes[i] = indexes[k];
      indexes[k] = tmp;
    }
  }
    

  // comparaters
  
  public int compare(int column, int row1, int row2) {
    Object o1 = model.getValueAt(row1, column);
    Object o2 = model.getValueAt(row2, column); 
    if (o1 == null && o2 == null) {
      return  0; 
    } else if (o1 == null) {
      return -1; 
    } else if (o2 == null) { 
      return  1; 
    } else {   
      Class type = model.getColumnClass(column);
      if (type.getSuperclass() == Number.class) {
        return compare((Number)o1, (Number)o2);
      } else if (type == String.class) {
        return ((String)o1).compareTo((String)o2);
      } else if (type == Date.class) {
        return compare((Date)o1, (Date)o2);
      } else if (type == Boolean.class) {
        return compare((Boolean)o1, (Boolean)o2);
      } else {
        return ((String)o1).compareTo((String)o2);
      }      
    }
  }
  
  public int compare(Number o1, Number o2) {
    double n1 = o1.doubleValue();
    double n2 = o2.doubleValue();
    if (n1 < n2) {
      return -1;
    } else if (n1 > n2) {
      return 1;
    } else {
      return 0;
    }
  }
  
  public int compare(Date o1, Date o2) {
    long n1 = o1.getTime();
    long n2 = o2.getTime();
    if (n1 < n2) {
      return -1;
    } else if (n1 > n2) {
      return 1;
    } else {
      return 0;
    }
  }
  
  public int compare(Boolean o1, Boolean o2) {
    boolean b1 = o1.booleanValue();
    boolean b2 = o2.booleanValue();
    if (b1 == b2) {
      return 0;
    } else if (b1) {
      return 1;
    } else {
      return -1;
    }
  }
  
}