command.java

基于Java的软件信息系统－项目管理

package core;

import java.util.*;
import java.io.*;
import ui.PromptDialog;
import ui.ResultDialog;

public abstract class Command
{
    public static final int TEXT_MODE = 0;
    public static final int GUI_MODE = 1;

    private boolean m_initialized;
    private Map m_params;
    private int m_mode;
    private javax.swing.JFrame m_baseFrame;

    public Command ()
    {
	m_params = new HashMap ();
	m_initialized = false;
	m_mode = TEXT_MODE;
    }

    public void setTextMode ()
    {   m_mode = TEXT_MODE; }
    public void setGUIMode (javax.swing.JFrame frm)
    {   
	m_mode = GUI_MODE;
	m_baseFrame = frm;
    }
    public int getMode ()
    {   return m_mode; }

    
    public javax.swing.JFrame getFrame ()
    {
        return m_baseFrame;
    }

    public void setInitialized ()
    {   m_initialized = true; }
    public boolean isInitialized ()
    {   return m_initialized; }

    public void setParameter (String name, String value)
    {
	m_params.put (name, value);
    }
    public String getParameter (String name)
    {
	if (m_params.containsKey (name))
	    return (String) m_params.get (name);
	else
	    return null;
    }

    public void execute ()
    {
	if (isInitialized ())
	    executeCommand ();
    }

    public void setParameters (List params)
    {
	String [] paramNames = getParameterNames ();
	Iterator paramIter = params.iterator ();
	for (int i = 0; i < paramNames.length; i++)
	{
	    String name = paramNames[i];
	    String value = (String) paramIter.next();
	    setParameter (name, value);
	}
	setInitialized ();
    }

    public void setParameters ()
    {
	switch (getMode())
	{
	    case TEXT_MODE:
		setParametersText ();
		break;
	    case GUI_MODE:
		setParametersGUI ();
		break;
	    default:
		setParametersText ();
		break;
	}
    }

    public void setParametersText ()
    {
	try
	{
            BufferedReader in =
                new BufferedReader (new InputStreamReader (System.in));

	    String [] paramNames = getParameterNames ();
	    String [] prompts = getParameterPrompts ();

	    for (int i = 0; i < paramNames.length; i++)
	    {
		String name = paramNames[i];
		String prompt = prompts[i];
		System.out.print (prompt + " ");
		String value = in.readLine();
		setParameter (name, value);
	    }
	    setInitialized ();
	} catch (java.io.IOException e)
	{
	    System.err.println ("IOException: Command parameters not initialized.");
	}
    }

    public void setParametersGUI ()
    {
        PromptDialog dlog = new PromptDialog (this);
        if (!dlog.isCanceled ())
        {
            setParameters (dlog.getValues());
        }
    }

    protected void displayResults (String title, List result)
    {
	switch (getMode())
	{
	    case TEXT_MODE:
		displayResultsText (title, result);
		break;
	    case GUI_MODE:
		displayResultsGUI (title, result);
		break;
	    default:
		displayResultsText (title, result);
		break;
	}
    }

    protected void displayResultsText (String title, List result)
    {
	System.out.println (title);
        Iterator iter = result.iterator();
        while (iter.hasNext())
        {
            System.out.println (iter.next().toString());
        }
    }

    protected void displayResultsGUI (String title, List result)
    {
        ResultDialog dlog = new ResultDialog (this, title, result);
    }

    public abstract String [] getParameterNames ();
    public abstract String [] getParameterPrompts ();
    protected abstract void executeCommand ();
    public abstract String getMenuName ();
    public abstract String getName ();
    public abstract String getDescription ();
    public abstract Command makeInstance ();

    public String toString ()
    {
        return getName() + ": " + getDescription ();
    }
}