tablesorterimpl.java

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package sortTable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import javax.swing.table.TableModel;

/**
 *
 * @author Administrator
 */
public class TableSorterImpl implements TableSorter {
    private List indexList;
    protected TableModel model;
    protected Comparator comparator;

    public TableSorterImpl(TableModel model,Comparator comparator){
        this();
        this.model = model;
        this.comparator = comparator;
    }
    
    public TableSorterImpl(){
        indexList = new ArrayList();
    }
    
    public Comparator getComparator() {
        return comparator;
    }

    public void setComparator(Comparator comparator) {
        this.comparator = comparator;
    }

    public TableModel getModel() {
        return model;
    }

    public void setModel(TableModel model) {
        this.model = model;
    }
    
    public void sort(int viewColumn) {
        if(comparator == null){
            throw new RuntimeException("Comparator can not be null!");
        }
        initIndexList(viewColumn);
        Collections.sort(indexList,comparator);
        //把排序信息更新到table
        changeRowIndex(indexList);
    }

    private void initIndexList(int col) {
        indexList.clear();
        for (int i = 0; i < model.getRowCount(); i++) {
            indexList.add(new IndexCell(i, model.getValueAt(i, col)));
        }
    }

    public void changeRowIndex(List indexList) {
        Object[][] backup = new Object[model.getRowCount()][model.getColumnCount()];
        for (int row = 0; row < backup.length; row++) {
            for (int col = 0; col < backup[row].length; col++) {
                backup[row][col] = model.getValueAt(row, col);
            }
        }
        Object[] indexArray = indexList.toArray();
        for (int row = 0; row < model.getRowCount(); row++) {
            int oldRowId = ((IndexCell) indexArray[row]).getRowIndex();
            for (int col = 0; col < model.getColumnCount(); col++) {
                model.setValueAt(backup[oldRowId][col], row, col);
            }
        }
    }
}