util.java

手机地图软件,还未完全做出来,是用NETBEAN和做的

/*
 *
 * Copyright (c) 2007, Sun Microsystems, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of Sun Microsystems nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package examples.cityguide;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import java.util.Vector;

import javax.microedition.lcdui.Gauge;
import javax.microedition.lcdui.Image;
import javax.microedition.location.AddressInfo;
import javax.microedition.location.Landmark;
import javax.microedition.location.LandmarkStore;
import javax.microedition.location.QualifiedCoordinates;


/**
 * general utilities for CityGuide
 */
public class Util {
    /**
     * This method reads landmarks from InputStream.
     * Landmarks are stored in text file as values with delimiter ","
     * Method updates progress bar.
     *
     * @param is character stream containing records of landmarks
     * @param progressGauge if not null external progress indicator is updated.
     */
    public static final void readLandmarksFromStream(LandmarkStore store, InputStream is,
        Gauge progressGauge) throws IOException {
        Landmark landmark;
        int count = 0;
        int nchars = -1;
        char[] buffer = new char[10]; //slowdown reading
        InputStreamReader isr = new InputStreamReader(is);
        StringBuffer record = new StringBuffer();

        do {
            nchars = isr.read(buffer);

            for (int i = 0; i < nchars; i++) {
                if (buffer[i] == '\n') {
                    addLandmarkFromString(store, record.toString());

                    if (progressGauge != null) {
                        progressGauge.setValue(count++);
                    }

                    record = new StringBuffer();
                } else {
                    record.append(buffer[i]);
                }
            }
        } while (nchars == buffer.length);

        addLandmarkFromString(store, record.toString());
        progressGauge.setValue(count++);
    }

    /**
     * This method creates landmark from values in String record.
     * Values are separated by comma. Sequence of the values is firm.
     * Latitude, Longitude, Altitude,Name, Description, Street & house number,
     * City, Post Code, Phone Number, Category
     *
     * @return landmark
     * @param record comma separated values
     */
    public static final void addLandmarkFromString(LandmarkStore store, String record)
        throws IOException {
        Landmark landmark = null;

        try {
            Enumeration e = parseSVRecord(record, ',');

            if (!e.hasMoreElements()) {
                return;
            }

            double xCoord = Double.parseDouble((String)e.nextElement());
            double yCoord = Double.parseDouble((String)e.nextElement());
            float altitude = Float.parseFloat((String)e.nextElement());
            String name = (String)e.nextElement();
            String description = (String)e.nextElement();
            String street = (String)e.nextElement();
            String pcode = (String)e.nextElement();
            String phone = (String)e.nextElement();
            String city = (String)e.nextElement();
            String category = (String)e.nextElement();

            //create coordinates
            QualifiedCoordinates coords = new QualifiedCoordinates(xCoord, yCoord, altitude, 0, 0);

            //create address
            AddressInfo address = new AddressInfo();
            address.setField(AddressInfo.STREET, street);
            address.setField(AddressInfo.CITY, city);
            address.setField(AddressInfo.POSTAL_CODE, pcode);
            address.setField(AddressInfo.PHONE_NUMBER, phone);

            landmark = new Landmark(name, description, coords, address);

            Enumeration c = store.getCategories();
            boolean exists;

            for (exists = false; c.hasMoreElements();)
                if (category.equals((String)c.nextElement())) {
                    exists = true;

                    break;
                }

            if (!exists) {
                store.addCategory(category);
            }

            store.addLandmark(landmark, category);
        } catch (NoSuchElementException e) {
            throw new IOException("Incorrect number of fields in landmark record.");
        } catch (Exception e) {
            throw new IOException("Cannot add landmark.");
        }
    }

    /**
     * This method parses separated values from record.
     *
     * @return String values from record as Enumeration
     * @param str  record containing separated values
     * @param delimiter values delimiter char
     */
    public static final Enumeration parseSVRecord(String str, char delimiter) {
        int length = str.length();
        int beginindex = 0;
        Vector v = new Vector();

        for (int i = 0; i < length; i++) {
            if (str.charAt(i) == delimiter) {
                v.addElement(str.substring(beginindex, i).trim());
                beginindex = i + 1;
            }

            if (i == (length - 1)) {
                v.addElement(str.substring(beginindex, length).trim());
            }
        }

        return v.elements();
    }

    /**
     *
     */
    public static final String[] asArray(Enumeration e) {
        Vector v = new Vector();
        v.copyInto(new String[v.size()]);

        for (; e.hasMoreElements();)
            v.addElement(e.nextElement());

        String[] array = new String[v.size()];
        Object o;
        v.copyInto(array);

        return array;
    }
}