io Programmo 39/IOPROG_39.ISO/SOFT/sdkjava40.exe/data1.cab/fg_Samples/Samples/afc11/JNotepad/src/SettingsObject.java

Java Source | 2000-05-04 | 6.4 KB | 306 lines

//
// (C) Copyright 1995 - 1999 Microsoft Corporation.  All rights reserved.
//
//
//
// SettingsObject
//
// Class to encapsulate the file (or whatever) that is going to
// store program settings.
// We keep everything in memory, so make sure you don't store
// TOO much stuff in here. :)
// 7/30/97 TJS

import java.io.*;
import java.util.*;
import com.ms.ui.*;
import com.ms.fx.FxToolkit;

public class SettingsObject
{
    private Hashtable settingsTable;
    private String sFileName;

    public SettingsObject(String filename)
    {
        init(filename);
    }

    private void init(String filename)
    {
        sFileName = filename;
        settingsTable = new Hashtable(5);
    }

    protected void loadDefaults()
    {
    }

    // internal method to set an option
    private void setValue(String section, String key, String value)
    {
        Hashtable sectionTable = (Hashtable)settingsTable.get(section);
        if (sectionTable == null)
        {
            sectionTable = new Hashtable(11);
            settingsTable.put(section, sectionTable);
        }

        sectionTable.put(key, value);
    }

    // internal method to get an option.
    private String getValue(String section, String key)
    {
        Hashtable sectionTable = (Hashtable)settingsTable.get(section);
        if (sectionTable == null)
        {
            return null;
        }

        return (String)sectionTable.get(key);
    }

    // public methods to set options. We overload the setOption
    // method to let you pass it strings, ints, or booleans.
    // All are converted to strings and then saved using setValue()
    public void put(String section, String key, String value)
    {
        setValue(section, key, value);
    }

    public void put(String section, String key, int value)
    {
        setValue(section, key, String.valueOf(value));
    }

    public void put(String section, String key, boolean value)
    {
        setValue(section, key, String.valueOf(value));
    }

    // bunch of get() methods. Different methods allow you
    // to have data returned in String, int, or boolean format.
    // returns the last parameter passed if the key was not found.

    // get() is the default method to grab data from this table...
    // it returns a String. It's the same as getString()
    public String get(String section, String key, String def)
    {
        return getString(section, key, def);
    }

    public String getString(String section, String key, String def)
    {
        String s = getValue(section, key);

        if (s != null)
        {
            return s;
        }
        else
        {
            return def;
        }
    }

    public int getInt(String section, String key, int def)
    {
        int i = 0;
        try
        {
            i = Integer.parseInt(getValue(section, key));
        }
        catch (NumberFormatException e)
        {
            i = def;
        }

        return i;
    }

    // getOptionBoolean() returns either false if the string
    // is not equal to "true", so there's no need to pass
    // a default value.
    public boolean getBoolean(String section, String key)
    {
        return Boolean.valueOf(getValue(section, key)).booleanValue();
    }

    public Enumeration getKeys(String section)
    {
        Hashtable sectionTable = (Hashtable)settingsTable.get(section);
        if (sectionTable == null)
        {
            return null;
        }
        return sectionTable.keys();
    }

    public boolean load()
    {
        DataInputStream inputStream = null;

        try
        {
            inputStream = new DataInputStream(new FileInputStream(sFileName));
        }
        catch (IOException e)
        {
            // error reading settings file, using default settings
            UIMessageBox _box_ = new UIMessageBox(new UIFrame(),
                JNotePad.loadString(ResourceIDs.IDS_MSGTITLE),
                JNotePad.loadString(ResourceIDs.IDS_MSGNOSETTINGS),
                UIMessageBox.STOP, UIButtonBar.OK);
            _box_.doModal();

            return false;
        }

        boolean ret = true;

        try
        {
            readData(inputStream);
        }
        catch (IOException e)
        {
            // error reading settings
            UIMessageBox _box_ = new UIMessageBox(new UIFrame(),
                JNotePad.loadString(ResourceIDs.IDS_MSGTITLE),
                JNotePad.loadString(ResourceIDs.IDS_MSGSETTINGSERR),
                UIMessageBox.STOP, UIButtonBar.OK);
            _box_.doModal();

            ret = false;
        }

        try
        {
            inputStream.close();
        }
        catch (IOException e)
        {
        }

        return ret;
    }

    public boolean save()
    {
        DataOutputStream outputStream = null;

        try
        {
            outputStream = new DataOutputStream(new FileOutputStream(sFileName));
        }
        catch (IOException e)
        {
            // error saving settings
            UIMessageBox _box_ = new UIMessageBox(new UIFrame(),
                JNotePad.loadString(ResourceIDs.IDS_MSGTITLE),
                JNotePad.loadString(ResourceIDs.IDS_MSGSETTINGSSAVEERR),
                UIMessageBox.STOP, UIButtonBar.OK);
            _box_.doModal();

            return false;
        }

        boolean ret = true;

        try
        {
            writeData(outputStream);
        }
        catch (IOException e)
        {
            ret = false;
        }

        try
        {
            outputStream.close();
        }
        catch (IOException e)
        {
        }

        return ret;
    }

    private void writeData(DataOutputStream outputStream) throws IOException
    {
        Enumeration e = settingsTable.keys();
        while (e.hasMoreElements())
        {
            String sectionName = (String)e.nextElement();
            Hashtable sectionTable = (Hashtable)settingsTable.get(sectionName);

            outputStream.writeBytes("\r\n["+sectionName+"]\r\n");

            Enumeration e2 = sectionTable.keys();
            while (e2.hasMoreElements())
            {
                String key = (String)e2.nextElement();
                String value = (String)sectionTable.get(key);
                // !! This should be an unnecessary test
                if (value == null)
                {
                    return;
                }

                outputStream.writeBytes(key+"="+value+"\r\n");
            }
        }

        return;
    }

    private void readData(DataInputStream inputStream) throws IOException
    {
        String s = null;
        String sectionName = null;
        String key = null;
        String value = null;

        clear();

        while ((s = inputStream.readLine()) != null)
        {
            if (s.length() > 0)
            {
                if (s.charAt(0) == '[')
                {
                    sectionName = s.substring(1, s.length()-1);
                }
                else
                {
                    int iIndex = s.indexOf('=');
                    if (iIndex < 0)
                    {
                        throw new IOException();
                    }
                    key = s.substring(0, iIndex);
                    value = s.substring(iIndex+1);

                    setValue(sectionName, key, value);
                }
            }
        }
    }

    public void clear()
    {
        Enumeration e = settingsTable.elements();

        while (e.hasMoreElements())
        {
            ((Hashtable)e.nextElement()).clear();
        }

        settingsTable.clear();
    }

}