EditProperties.java

package easai.util;

import java.io.*;
import java.text.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;

public class EditProperties extends JDialog implements ActionListener
{
    Properties properties=null;
    int nProperties=0;
    private JButton cancel= new JButton("Cancel");
    private JButton save= new JButton("Save");
    private JScrollPane scroll= new JScrollPane();
    private JTable table;

    public EditProperties(Properties properties)
    {
	super((Frame)null, "Edit Properties", true);
	this.properties=properties;
    }

    public Properties init()
    {
	Container panel=getContentPane();
        panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));

        addWindowListener(new java.awt.event.WindowAdapter()
	    {
		public void windowClosing(java.awt.event.WindowEvent e)
		{
		    dispose();
		}
	    });

	// setting "properties" data to "values" array
	for (Enumeration e = properties.propertyNames() ; e.hasMoreElements() ;) 
	    {
		nProperties++;
		e.nextElement();
	    }
	if(nProperties<=0)
	    dispose();
	Object values[][]=new Object[nProperties][2];
	int i=0;
	for (Enumeration e = properties.propertyNames() ; e.hasMoreElements() ;) 
	    {
		values[i][0]=e.nextElement();
		values[i][1]=properties.getProperty((String)(values[i][0]));
		i++;
	    }

        table=new JTable(values,new String []{"Property", "Values"});
   
	setAlwaysOnTop(true);
	scroll.setViewportView(table);
        panel.add(scroll);
        save.addActionListener(this);
        cancel.addActionListener(this);

	JPanel control=new JPanel();
	control.setLayout(new FlowLayout());
        control.add(save);
        control.add(cancel);
	panel.add(control);
        pack();
	setVisible(true);
	
	return properties;
    }

    public String defaultProperty(String propertyName, String defaultValue)
    {
	String property="";
	if((property=properties.getProperty(propertyName))==null 
	   || property.equals(""))
	    property=defaultValue;
	properties.setProperty(propertyName,property);
	return property;
    }    

    public void actionPerformed(ActionEvent e)
    {
	Object source=e.getSource();
	if(source==cancel)
	    {
		dispose();
	    }
	else
	    {
		String propertyName="", propertyValue;
		TableCellEditor editor=null;
		if(table!=null)
		    {
			editor=table.getCellEditor();
			if(editor!=null)
			    editor.stopCellEditing();
			Object object=null;
			for(int i=0;i<nProperties;i++)
			    {
				object=table.getValueAt(i,0);
				if(object!=null)
				    propertyName=(String)object;
				object=table.getValueAt(i,1);
				propertyValue=(String)object;
				if(!propertyName.equals("") && propertyValue!=null)
				    {
					properties.setProperty(propertyName, propertyValue);
				    }
			    }
			dispose();
		    }
	    }
    }

    public void readProperties(String fileName)
    {
	FileInputStream in=null;
	try
	    {
		File file=new File(fileName);
		if(file.exists() && file.length()>0)
		    {
			in=new FileInputStream(file);
			properties.loadFromXML(in);
		    }
	    }
	catch(Exception e){e.printStackTrace();}
	finally
	    {
		try
		    {
			if(in!=null)
			    in.close();
		    }
		catch(Exception e){e.printStackTrace();}
	    }
    }

    public void writeProperties(String fileName)
    {
	FileOutputStream out=null;
	try
	    {
		out=new FileOutputStream(fileName);	    
		DateFormat dateFormat=DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
		properties.storeToXML(out,dateFormat.format(new java.util.Date()));
	    }
	catch(Exception e)
	    {
		try
		    {
			JFileChooser dlg=new JFileChooser(properties.getProperty("photoDir"));
			int retval=dlg.showDialog(this,"Select another properties file");
			File propertiesFile;
			if(retval==JFileChooser.APPROVE_OPTION)
			    {
				propertiesFile=dlg.getSelectedFile();
				if(propertiesFile.exists())
				    {
					out=new FileOutputStream(propertiesFile);	    
					DateFormat dateFormat=DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
					properties.storeToXML(out,dateFormat.format(new java.util.Date()));					
				    }
			    }					
		    }catch(Exception ex){ex.printStackTrace();}
		e.printStackTrace();
	    }
	finally
	    {
		try
		    {
			if(out!=null)
			    out.close();
		    }
		catch(Exception e){e.printStackTrace();}
	    }
    }

    // for debugging purposes only
    public static void main(String args[])
    {
	Properties properties=new Properties();
	properties.setProperty("application name","EditProperties");
	properties.setProperty("author","easai");
	properties.setProperty("date created","Fri Dec 10 20:50:33 2004");
	properties.setProperty("debug","true");
	properties.setProperty("verbose","false");
	EditProperties editProperties=new EditProperties(properties);
	properties=editProperties.init();
    }    
}