SamplePluginApp.java

package old_plugin;

import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.net.*;
import java.util.*;
import java.util.jar.*;

import javax.swing.*;

public class SamplePluginApp extends JFrame {
    private static final long serialVersionUID = 1L;

    private JTextField result;
    private JComboBox pluginsCombo;
    private JPanel panel;

    private ArrayList <SamplePluginAppPlugin>plugins;
    private SamplePluginAppPlugin selectedPlugin;
    private JPanel selectedPluginPanel;

    public static void main(String[] args) {
        new SamplePluginApp().setVisible(true);
    }

    // コンストラクタ。基本GUIの作成
    public SamplePluginApp(){
        result = new JTextField();
        this.add(result,BorderLayout.NORTH);
        panel = new JPanel();
        panel.setLayout(new BorderLayout());
        pluginsCombo = this.getPluginComboBox();
        pluginsCombo.setBounds(new Rectangle(25,25,100,20));
        pluginsCombo.addActionListener(new pluginComboAction());
        panel.add(pluginsCombo,BorderLayout.NORTH);
        panel.add(selectedPlugin.getPanel(),BorderLayout.CENTER);
        this.add(panel,BorderLayout.CENTER);
        JButton button = new JButton("calc");
        button.addActionListener(new buttonAction());
        this.add(button,BorderLayout.SOUTH);
        this.setSize(new Dimension(200,200));
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    // JComboBoxの作成
    public JComboBox getPluginComboBox(){
        JComboBox combo = new JComboBox();
        plugins = getPlugins();
        // デフォルトプラグインの準備
        selectedPlugin = new DefaultPlugin();
        selectedPluginPanel = selectedPlugin.getPanel();
        combo.addItem(selectedPlugin);

        for(int i = 0;i < plugins.size();i++){
            SamplePluginAppPlugin plugin = plugins.get(i);
            combo.addItem(plugin);
        }
        return combo;
    }

    // JComboBoxのActionListener
    class pluginComboAction implements ActionListener {
        public void actionPerformed(ActionEvent ev){
            panel.removeAll();
            panel.add(pluginsCombo,BorderLayout.NORTH);
            selectedPlugin = (SamplePluginAppPlugin)
                    pluginsCombo.getSelectedItem();
            selectedPluginPanel = selectedPlugin.getPanel();
            panel.add(selectedPluginPanel);
            panel.updateUI();
        }
    }

    // JButtonのActionListener
    class buttonAction implements ActionListener {
        public void actionPerformed(ActionEvent ev){
            result.setText(selectedPlugin.getResult());
        }
    }

    // プラグインクラスのインスタンスをArrayListにまとめて返す
    public ArrayList<SamplePluginAppPlugin> getPlugins() {
        ArrayList <SamplePluginAppPlugin>plugins =
                new ArrayList<SamplePluginAppPlugin>();
        String cpath = System.getProperty("user.dir") + File.separator + "plugins";
        // String cpath = System.getProperty("user.dir") + "\\test\\plugin" + File.separator + "plugins";
        System.out.println(cpath);
        // String cpath = "C:\\home\\miyahara\\90_warehouse\\01_git\\JAVA_TRAINING2\\JAVA_TRAINING\\JAVATRAINING_ROOT\\test\\plugin\\plugins";
        try {
            File f = new File(cpath);
            String[] files = f.list();
            for (int i = 0; i < files.length; i++) {
                if (files[i].endsWith(".jar")) {
                    File file = new File(cpath + File.separator + files[i]);
                    // File file = new File("C:\\home\\miyahara\\90_warehouse\\01_git\\JAVA_TRAINING2\\JAVA_TRAINING\\JAVATRAINING_ROOT\\test\\plugin\\plugins\\average.jar");
                    JarFile jar = new JarFile(file);
                    Manifest mf = jar.getManifest();
                    Attributes att = mf.getMainAttributes();
                    String cname = att.getValue("Plugin-Class");
                    URL url = file.getCanonicalFile().toURI().toURL();
                    URLClassLoader loader = new URLClassLoader(
                            new URL[] { url });
                    System.out.println(mf.getMainAttributes());
                    System.out.println(cname);
                    Class cobj = loader.loadClass(cname);
                    Class[] ifnames = cobj.getInterfaces();
                    for (int j = 0; j < ifnames.length; j++) {
                        if (ifnames[j] == SamplePluginAppPlugin.class) {
                            System.out.println("load..... " + cname);
                            SamplePluginAppPlugin plugin =
                                (SamplePluginAppPlugin)cobj.newInstance();
                            plugins.add(plugin);
                            break;
                        }
                    }
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return plugins;
    }
}

// サンプルプラグインのクラス
class DefaultPlugin implements SamplePluginAppPlugin {
    private JTextField input;
    private JPanel currentPanel;

    public String toString(){
        return "Default(tax)";
    }

    public String getResult() {
        String inputData = input.getText();
        if (inputData == null) inputData = "0";
        int n;
        try {
            n = Integer.parseInt(inputData);
        } catch (NumberFormatException e) {
            e.printStackTrace();
            n = 0;
        }
        double res = ((int)(n * 1.05 * 100)) / 100;
        return Double.toString(res);
    }

    public void setInputData(String str) {
        input.setText(str);
    }

    public String getInputData(){
        return input.getText();
    }

    public JPanel getPanel() {
        currentPanel = new JPanel();
        currentPanel.setLayout(null);
        input = new JTextField();
        input.setBounds(new Rectangle(25,25,50,20));
        currentPanel.add(input);
        return currentPanel;
    }

}