strategypatternexample.java

来自「《深入浅出设计模式》的完整源代码」· Java 代码 · 共 114 行

package exporter;

import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import java.awt.*;
import java.awt.event.*;
import java.awt.HeadlessException;
public class StrategyPatternExample
    extends JFrame {
  private JButton exportButton;
  private JTable dataInput;
  private JTextArea converterOutput;
  private JRadioButton rbTabs, rbCSV, rbHTML;
  public StrategyPatternExample () throws HeadlessException {
    super ("Strategy Pattern Example");
    addWindowListener (new WindowAdapter () {
      public void windowClosing (WindowEvent e) {
        System.exit (0);
      }
    });
    JPanel listPanel = new JPanel ();
    JPanel controlPanel = new JPanel ();
    // data input
    dataInput = new JTable (new DataModel ());
    JScrollPane dataInputPane = new JScrollPane (dataInput);
    dataInput.setPreferredScrollableViewportSize (new Dimension (200, 100));
    listPanel.add (dataInputPane);
    // converter output
    converterOutput = new JTextArea ();
    converterOutput.setFont (new Font ("monospaced", 0, 12));
    JScrollPane converterOutputPane = new JScrollPane (converterOutput);
    converterOutputPane.setPreferredSize (new Dimension (200, 120));
    listPanel.add (converterOutputPane);
    exportButton = new JButton ("Export");
    exportButton.addActionListener (new ActionListener () {
      public void actionPerformed (ActionEvent e) {
        doExport ();
      }
    });
    ButtonGroup bg = new ButtonGroup ();
    rbTabs = new JRadioButton ("Tabs");
    rbCSV = new JRadioButton ("CSV");
    rbHTML = new JRadioButton ("HTML");
    bg.add (rbTabs);
    bg.add (rbCSV);
    bg.add (rbHTML);
    controlPanel.setLayout (new FlowLayout ());
    controlPanel.add (rbTabs);
    controlPanel.add (rbCSV);
    controlPanel.add (rbHTML);
    controlPanel.add (exportButton);

    getContentPane ().setLayout (new BorderLayout ());
    getContentPane ().add (listPanel, BorderLayout.CENTER);
    getContentPane ().add (controlPanel, BorderLayout.SOUTH);
    pack ();
    setVisible (true);
  }
  public void doExport () {
    TableExporter te = null;
    if (this.rbTabs.isSelected ()) {
      te = new TableExporterTabs ();
    }
    else if (rbCSV.isSelected ()) {
      te = new TableExporterCSV ();
    }
    else if (rbHTML.isSelected ()) {
      te = new TableExporterHTML ();
    }
    if (te != null) {
      converterOutput.setText (te.getExported ( ( (DataModel) dataInput.
                                                 getModel ()).getAllData ()));
      converterOutput.select (0, 0);
    }
  }
  public static void main (String[] args) throws HeadlessException {
    StrategyPatternExample spe = new StrategyPatternExample ();
    spe.show ();
  }
  public class DataModel
      extends AbstractTableModel {
    private String mRows[][] = {
        {
        "342", "543", "167"}
        , {
        "633", "207", "921"}
        , {
        "290", "544", "519"}
        , {
        "810", "105", "440"}
    };
    String[][] getAllData () {
      return (String[][]) mRows.clone ();
    }
    public void setRows (String[][] pRows) {
      mRows = pRows;
    }
    public int getColumnCount () {
      if (mRows != null && mRows.length > 0 && mRows[ 0 ] != null) {
        return mRows[ 0 ].length;
      }
      return 0;
    }
    public int getRowCount () {
      if (mRows == null) {
        return 0;
      }
      return mRows.length;
    }
    public Object getValueAt (int row, int column) {
      return mRows[ row ][ column ];
    }
  }
}