loadpropertiesmenuitem.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/gui/menu/LoadPropertiesMenuItem.java,v $
// $RCSfile: LoadPropertiesMenuItem.java,v $
// $Revision: 1.3.2.1 $
// $Date: 2004/10/14 18:26:55 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.gui.menu;

import java.awt.event.*;
import java.awt.*;
import java.util.*;
import java.io.*;

import com.bbn.openmap.*;
import com.bbn.openmap.util.Debug;

/**
 * This is a menu item that loads a file. This file should be a valid
 * openmap properties file, with openmap.layers set and projection
 * properties set. The components list is ignored, since it is pretty
 * dependent on order, and it's hard to write a good properties file
 * automatically with a valid components list.
 * <P>
 * If you want to change the components in an application, launch
 * OpenMap with the properties file you want.
 */
public class LoadPropertiesMenuItem extends MapHandlerMenuItem implements
        ActionListener {

    public LoadPropertiesMenuItem() {
        super("Load Map Properties");
        addActionListener(this);
    }

    public void actionPerformed(ActionEvent ae) {
        //Collect properties
        if (mapHandler == null) {
            return;
        }

        PropertyHandler ph = null;
        Iterator it = mapHandler.iterator();
        while (it.hasNext()) {
            Object someObj = it.next();
            if (someObj instanceof PropertyHandler) {
                ph = (PropertyHandler) someObj;
                break;
            }
        }

        if (ph == null) {
            Debug.error("Couldn't find PropertyHandler");
            return;
        }

        FileDialog fd = new FileDialog(new Frame(), "Loading the map from a Properties file...", FileDialog.LOAD);
        fd.show();

        String fileName = fd.getFile();
        String dirName = fd.getDirectory();

        if (fileName == null) {
            Debug.message("loadpropertiesmenuitem",
                    "User did not select any file");
            return;
        }

        Debug.message("loadpropertiesmenuitem", "User selected file " + dirName
                + File.separator + fileName);

        File file = new File(new File(dirName), fileName);

        try {
            Properties newProps = new Properties();
            FileInputStream fis = new FileInputStream(file);

            newProps.load(fis);

            String test = newProps.getProperty("openmap."
                    + LayerHandler.layersProperty);
            if (test == null) {
                throw new IOException("Doesn't seem like a valid properties file");
            }

            // Just reset the projection and layers, not the
            // components.
            ph.loadProjectionAndLayers(mapHandler, newProps);

        } catch (FileNotFoundException fnfe) {
            Debug.error(fnfe.getMessage());
        } catch (IOException ioe) {
            InformationDelegator id = (InformationDelegator) mapHandler.get("com.bbn.openmap.InformationDelegator");

            if (id != null) {
                id.displayMessage("Error loading file...",
                        "Error occured loading " + file.getAbsolutePath()
                                + "\n" + ioe.getMessage());
            }
            Debug.error("Error occured loading " + file.getAbsolutePath());
        }
    }
}