Properties

Ja, gör det!

Sitter och försöker skriva ett pop3 program i java. Det kommer säkert att komma frågor :)
Hittade en bra pop3-klass så det är inga problem, men att få ihop skiten med ett vettigt gränssnitt, lite loggar och tjoffa runt det i en databas kommer nog att generera en och annan fråg!

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The computer is mightier than the pen, the sword, and usually, the programmer.

Okej... Låååångt blir det...

PropertyHandler.java

/*
 * PropertyHandler.java
 *
 * Created on den 9 januari 2002, 10:40
 */

package lime.util;

/**
 * This is a code used mainly for internal educational use.
 * Feel free to use it as you wich but please state the origin
 * of the code.
 * <p>
 * The author will not answer any questions about the code by mail.
 * Questions can be asked at <a href="http://program.webforum.nu/"> WebForum</a>
 *
 * @author  lime@enea.se
 */
public class PropertyHandler {
    
    /** Creates a new instance of PropertyHandler */
    public PropertyHandler() {
    }

    /**
    * @param args the command line arguments
    */
    public static void main (String args[]) {
       new PropertyHandlerFrame();
       
    }

}

PropertyHandlerFrame.java

/*
 * PropertyHandlerFrame.java
 *
 * Created on den 9 januari 2002, 09:59
 */

package lime.util;
import javax.swing.*;
import java.io.*;
import javax.swing.filechooser.*;
import java.util.*;
import lime.util.tools.*;

/**
 * This is a code used mainly for internal educational use.
 * Feel free to use it as you wich but please state the origin
 * of the code.
 * <p>
 * The author will not answer any questions about the code by mail.
 * Questions can be asked at <a href="http://program.webforum.nu/"> WebForum</a>
 * <p>
 * All code is written in NetBeans IDE 3.3, downloadable for free at [url="http://www.netbeans.org."]www.netbeans.org.[/url] 
 * <p>
 * This class it the GUI-class for the example of the Property class.
 * <p>
 * @author  lime@enea.se
 */

public class PropertyHandlerFrame extends javax.swing.JFrame {
    
    /** Creates new form PropertyHandler */
    public PropertyHandlerFrame() {
        initComponents();
        this.show();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        keyList = new javax.swing.JList();
        valueList = new javax.swing.JList();
        menuBar = new javax.swing.JMenuBar();
        fileMenu = new javax.swing.JMenu();
        openMenuItem = new javax.swing.JMenuItem();
        saveMenuItem = new javax.swing.JMenuItem();
        exitMenuItem = new javax.swing.JMenuItem();
        editMenu = new javax.swing.JMenu();
        cutMenuItem = new javax.swing.JMenuItem();
        copyMenuItem = new javax.swing.JMenuItem();
        pasteMenuItem = new javax.swing.JMenuItem();
        deleteMenuItem = new javax.swing.JMenuItem();
        addMenuItem = new javax.swing.JMenuItem();
        editMenuItem = new javax.swing.JMenuItem();
        helpMenu = new javax.swing.JMenu();
        contentsMenuItem = new javax.swing.JMenuItem();
        aboutMenuItem = new javax.swing.JMenuItem();

        setForeground(java.awt.Color.black);
        setBackground(new java.awt.Color(204, 255, 255));
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });

        jPanel1.setBackground(new java.awt.Color(255, 255, 255));
        jPanel1.setPreferredSize(new java.awt.Dimension(300, 200));
        jPanel1.setMinimumSize(new java.awt.Dimension(200, 200));
        keyList.setBorder(new javax.swing.border.TitledBorder("Key"));
        keyList.setMinimumSize(new java.awt.Dimension(100, 100));
        jPanel1.add(keyList);

        valueList.setBorder(new javax.swing.border.TitledBorder("Value"));
        valueList.setMinimumSize(new java.awt.Dimension(100, 100));
        valueList.setEnabled(false);
        jPanel1.add(valueList);

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        fileMenu.setText("File");
        openMenuItem.setText("Open");
        openMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                openMenuItemActionPerformed(evt);
            }
        });

        fileMenu.add(openMenuItem);
        saveMenuItem.setText("Save");
        saveMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveMenuItemActionPerformed(evt);
            }
        });

        fileMenu.add(saveMenuItem);
        exitMenuItem.setText("Exit");
        exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                exitMenuItemActionPerformed(evt);
            }
        });

        fileMenu.add(exitMenuItem);
        menuBar.add(fileMenu);
        editMenu.setText("Edit");
        cutMenuItem.setText("Cut");
        editMenu.add(cutMenuItem);
        copyMenuItem.setText("Copy");
        editMenu.add(copyMenuItem);
        pasteMenuItem.setText("Paste");
        editMenu.add(pasteMenuItem);
        deleteMenuItem.setText("Delete Property");
        deleteMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                deleteMenuItemActionPerformed(evt);
            }
        });

        editMenu.add(deleteMenuItem);
        addMenuItem.setText("Add Property");
        addMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addMenuItemActionPerformed(evt);
            }
        });

        editMenu.add(addMenuItem);
        editMenuItem.setText("Edit Property");
        editMenu.add(editMenuItem);
        menuBar.add(editMenu);
        helpMenu.setText("Help");
        contentsMenuItem.setText("Contents");
        helpMenu.add(contentsMenuItem);
        aboutMenuItem.setText("About");
        helpMenu.add(aboutMenuItem);
        menuBar.add(helpMenu);
        setJMenuBar(menuBar);

        pack();
    }

    
    /**
     * This is the method that opens the .lprop file and restores the properties.
     * @param evt The ActionEvent from the Menu.
     **/
    private void openMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
        JFileChooser filechooser = new JFileChooser();
        ExtensionFileFilter filter = new ExtensionFileFilter();
        filter.addExtension("lprop");
        filter.setDescription("Lime Property files");
        filechooser.addChoosableFileFilter(filter);
        
        int selected = filechooser.showOpenDialog(null);
        
        switch(selected) {
            case JFileChooser.APPROVE_OPTION:
                File selectedFile = filechooser.getSelectedFile();
                File directory = filechooser.getCurrentDirectory();
                try{
                    props.load(new FileInputStream(selectedFile));
                }
                catch (java.io.IOException ioe) { ioe.printStackTrace(); System.exit(-1);}
                Enumeration keys = props.keys();
                keyVector.clear();
                valueVector.clear();
                
                while(keys.hasMoreElements()) {
                    String keyTemp = (String) keys.nextElement();
                    String valTemp = props.getProperty(keyTemp);
                    keyVector.add(keyTemp);
                    valueVector.add(valTemp);
                }
                updateLists();
            case JFileChooser.CANCEL_OPTION:
                break;
            default:
                break;
                   
        }
        
    }
    /**
     * This is the method that saves the parameters to the .lprop file.
     * @param evt The ActionEvent from the Menu.
     **/
    private void saveMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
        JFileChooser filechooser = new JFileChooser();
        ExtensionFileFilter filter = new ExtensionFileFilter();
        filter.addExtension("lprop");
        filter.setDescription("Lime Property files");
        filechooser.addChoosableFileFilter(filter);
        
        int selected = filechooser.showSaveDialog(null);
        
        switch (selected) {
            case JFileChooser.APPROVE_OPTION:
                File selectedFile = filechooser.getSelectedFile();
                File directory = filechooser.getCurrentDirectory();
                if (selectedFile != null) {
                    // Save the props
                    try {
                    props.store( new FileOutputStream(selectedFile), "Lime props");
                    }
                    catch (java.io.IOException ioe) { ioe.printStackTrace(); System.exit(-1);}
                } // if
                break;
            case JFileChooser.CANCEL_OPTION:
                break;
            default:
                break;
        } // switch
    }
    
    private void deleteMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
    
        String selectedKey = (String) keyList.getSelectedValue();
        
        if (selectedKey != null) {
            String valueFromProps = props.getProperty(selectedKey);
            
            String[] message = new String[3];
            message[0] = "Are you sure that you want to delete";
            message[1] = "the key \""+ selectedKey + "\"";
            message[2] = "with value \"" + valueFromProps + "\"?";
            
            int result = JOptionPane.showConfirmDialog(this,message,"Confirm Delete",JOptionPane.OK_CANCEL_OPTION );
            
            if (result == JOptionPane.YES_OPTION) {
                props.remove(selectedKey);
                valueVector.remove(valueFromProps);
                keyVector.remove(selectedKey);
                
                updateLists();
            }
        }
        
        
    }
    
    private void addMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
        // Add your handling code here:
        String key = null;
        String value = null;
        
        key =  JOptionPane.showInputDialog(this,"Enter the property key:","Property input: Key 1(2)", JOptionPane.OK_CANCEL_OPTION);
        
        if(key != null){
            value = JOptionPane.showInputDialog(this,"Enter the property value:","Property input: Value 2(2)", JOptionPane.OK_CANCEL_OPTION);
        }
        
        if ((value != null) && (key != null) && (value != "") && (key != "")){
            props.setProperty(key,value);
            keyVector.add(key);
            valueVector.add(value);

            updateLists();  
        }
    }
    
    private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
        System.exit(0);
    }
    
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    }
    
    private void updateLists() {
        keyList.setListData(keyVector);
        valueList.setListData(valueVector);
    }
    
    // Variables declaration - do not modify
    private javax.swing.JList valueList;
    private javax.swing.JMenuItem cutMenuItem;
    private javax.swing.JMenuItem addMenuItem;
    private javax.swing.JMenuItem pasteMenuItem;
    private javax.swing.JMenuItem aboutMenuItem;
    private javax.swing.JMenuItem deleteMenuItem;
    private javax.swing.JMenuItem saveMenuItem;
    private javax.swing.JMenu helpMenu;
    private javax.swing.JMenuItem editMenuItem;
    private javax.swing.JMenuBar menuBar;
    private javax.swing.JMenuItem contentsMenuItem;
    private javax.swing.JMenu editMenu;
    private javax.swing.JMenuItem exitMenuItem;
    private javax.swing.JMenuItem copyMenuItem;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JMenu fileMenu;
    private javax.swing.JList keyList;
    private javax.swing.JMenuItem openMenuItem;
    // End of variables declaration
    
    private static java.util.Properties props = new java.util.Properties();
    
    private Vector keyVector = new Vector(50);
    
    private Vector valueVector = new Vector(50);
    
}

ExtensionFileFilter.java

/*
 * ExtensionFileFilter.java
 *
 * Created on den 9 januari 2002, 14:11
 */

package lime.util.tools;

/**
 * A file filter that matches file name extensions.
 * These is to be a filter like this in the standard JFC
 * classes, making this obsolete.
 *
 * @author  ovli
 */
public class ExtensionFileFilter extends javax.swing.filechooser.FileFilter {

    /**
     * The description for this file filter.
     */
    private String description;
    
    /**
     * The extensions that match this filter.
     */
    private java.util.Hashtable filters = null;
    
    /** Creates a new instance of ExtensionFileFilter */
    public ExtensionFileFilter() {
        filters = new java.util.Hashtable();
        setDescription("undefined");
        
    }

    
    /**
     * Add the given extension to the list of extensions
     * to match. The extensions should not have a '.' in it.
     *  <p>
     * @param extension The extension to add to the list of matching extensions.
     **/
    public void addExtension(String extension) {
       filters.put(extension.toLowerCase(), this);
    }
    /**
     * @return The description of this file filter.
     **/
    public String getDescription() {
        return description;
    
    }
    /**
     * Set the description of this file filter. This
     * will be displayed in the file chooser's filter
     * selection box.
     * <p>
     * @param d The file filter's description.
     **/
    public void setDescription(String d) {
        description = d;
    }
    
    /**
     * The file maches if its extension is contained in our filter hashtable.
     * <p>
     * @param f The File to test for matching the filter criteria.
     * @return True if given File matches the filter criteria.
     *         False otherwise.
     **/
    public boolean accept(java.io.File f) {
        if (f != null) {
         if (f.isDirectory() ) {
          return true;        
         }
        String extension = getExtension(f);
            if (extension != null && filters.get (extension) != null){
                    return true;
            }
          }
        return false;
    }
       
    /**
     * Determine the extension of the given File.
     * <p>
     * @param f The File whose extension is desired.
     * @return The extension of the given File, in lower case.
     **/
    private String getExtension(java.io.File f) {
        if (f != null) {
         String filename = f.getName();
         int i = filename.lastIndexOf('.');
         if (i>0 && i<filename.length() -1 ) {
          return filename.substring(i+1).toLowerCase();   
         };
            
        }
        return null;
    }
    
}

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