Populate Address Book : Application « J2ME « Java
Populate Address Book
/*
* Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
*/
import javax.microedition.midlet.*;
import javax.microedition.rms.*;
/**
* Class to create an example address book and populate it
* with some records
*/
public class PopulateAddressBook extends MIDlet {
private final String personalNames[] = {
"John", "Zach", "2225556669",
"Mark", "Lynn", "5125551212",
"Joy", "Beth", "2705551234",
"Abby", "Lynn", "4085558566",
"Ted", "Alan", "4125552235",
"Sterling", "Wincle", "9995559111",
"Deborah", "Elaine", "4445552323",
"Suzanne", "Melissa","5125556064",
"Frank", "Kenneth", "7775551212",
"Dwight", "Poe", "1115557234",
"Laura", "Beth", "2055558888",
"Lisa", "Dawn", "2705551267",
"Betty", "June", "5555551556",
"Yvonne", "Poe", "6665558888",
"Lizzy", "Loo", "5025557971",
"John", "Gerald", "3335551256",
"Mark", "VandenBrink", "1115557878",
"Roger", "Riggs", "3335550000",
"Antero", "Taivalsaari", "9995552222"
};
public PopulateAddressBook() {
RecordStore rs;
RecordEnumeration re;
CreateAddressBook.createRecordStore("TheAddressBook",
personalNames);
try {
rs = RecordStore.openRecordStore("TheAddressBook", true);
re = rs.enumerateRecords(null, null, false);
while (re.hasNextElement()) {
byte[] b = re.nextRecord();
System.out.println("<" + SimpleRecord.getFirstName(b) + ">" +
"<" + SimpleRecord.getLastName(b) + ">" +
"<" + SimpleRecord.getPhoneNum(b) + ">");
}
} catch (Exception e) {
System.out.println("Houston, we have a problem: " + e);
}
}
/**
* Called by the system to start our MIDlet.
*/
protected void startApp() {
destroyApp(false);
notifyDestroyed();
}
/**
* Called by the system to pause our MIDlet.
* No actions required by our MIDLet.
*/
protected void pauseApp() {}
/**
* Called by the system to end our MIDlet.
* No actions required by our MIDLet.
*/
protected void destroyApp(boolean unconditional) {}
}
/*
* Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
*/
/**
* Static helper class that creates a record
* store from data in an array.
*/
class CreateAddressBook {
// Don't allow this class to be instantiated
private CreateAddressBook() {}
/**
* Helper method that creates a record
* store from data in an array.
* Returns:
* true if RMS store was created
* false otherwise
* name the name of the record store to create
* seedData an array w/ data to seed record store
*/
static boolean createRecordStore(String name,
String[] seedData) {
RecordStore recordStore;
boolean ret = false;
// Delete any previous record store with same name.
// Silently ignore failure.
try {
RecordStore.deleteRecordStore(name);
} catch (Exception rse) {}
// Create new RMS store. If we fail, return false.
try {
recordStore = RecordStore.openRecordStore(name, true);
} catch (RecordStoreException rse) {
return ret;
}
ret = true; // assume success
// Now, populate the record store with the seed data
for (int i = 0; i < seedData.length; i += 3) {
byte[] record = SimpleRecord.createRecord(seedData[i],
seedData[i+1],
seedData[i+2]);
try {
recordStore.addRecord(record, 0, record.length);
} catch (RecordStoreException rse) {
ret = false;
break;
}
}
// Get here when adds are complete, or an error occured.
// In any case, close the record store. We shouldn't
// have a failure, so silently ignore any exceptions.
try {
recordStore.closeRecordStore();
} catch (RecordStoreException rsne) {}
return ret;
}
}
/*
* Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
*/
/**
* This class implements the RecordComparator interface.
* It works on the records created by SimpleRecord.
* It sorts on either first name or last name.
*/
class SimpleComparator implements RecordComparator {
/**
* Sorting values (sort by first or last name)
*/
public final static int SORT_BY_FIRST_NAME = 1;
public final static int SORT_BY_LAST_NAME = 2;
/**
* Sort order. Set by constructor.
*/
private int sortOrder = -1;
/**
* Public constructor: sets the sort order to be
* used for this instantiation.
*
* Sanitize s: if it is not one of the
* valid sort codes, set it to SORT_BY_LAST_NAME
* silently.
* s the desired sort order
*/
SimpleComparator(int s) {
switch (s) {
case SORT_BY_FIRST_NAME:
case SORT_BY_LAST_NAME:
this.sortOrder = s;
break;
default:
this.sortOrder = SORT_BY_LAST_NAME;
break;
}
}
/**
* This is the compare method. It takes two
* records, and depending on the sort order
* extracts and lexicographically compares the
* subfields as two Strings.
*
* r1 First record to compare
* r2 Second record to compare
* return one of the following:
*
* RecordComparator.PRECEDES
* if r1 is lexicographically less than r2
* RecordComparator.FOLLOWS
* if r1 is lexicographically greater than r2
* RecordComparator.EQUIVALENT
* if r1 and r2 are lexicographically equivalent
*/
public int compare(byte[] r1,
byte[] r2) {
String n1 = null;
String n2 = null;
// Based on sortOrder, extract the correct fields
// from the record and convert them to lower case
// so that we can perform a case-insensitive compare.
if (sortOrder == SORT_BY_FIRST_NAME) {
n1 = SimpleRecord.getFirstName(r1).toLowerCase();
n2 = SimpleRecord.getFirstName(r2).toLowerCase();
} else if (sortOrder == SORT_BY_LAST_NAME) {
n1 = SimpleRecord.getLastName(r1).toLowerCase();
n2 = SimpleRecord.getLastName(r2).toLowerCase();
}
int n = n1.compareTo(n2);
if (n < 0) {
return RecordComparator.PRECEDES;
}
if (n > 0) {
return RecordComparator.FOLLOWS;
}
return RecordComparator.EQUIVALENT;
}
}
/*
* Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
*/
/**
* This class provides static methods that allow us
* to hide the format of a record.
* N.B. no synchronized access is provided
*/
final class SimpleRecord {
private final static int FIRST_NAME_INDEX = 0;
private final static int LAST_NAME_INDEX = 20;
private final static int FIELD_LEN = 20;
private final static int PHONE_INDEX = 40;
private final static int MAX_REC_LEN = 60;
private static StringBuffer recBuf =
new StringBuffer(MAX_REC_LEN);
// Don't let anyone instantiate this class
private SimpleRecord() {}
// Clear internal buffer
private static void clearBuf() {
for (int i = 0; i < MAX_REC_LEN; i++) {
recBuf.insert(i, ' ');
}
recBuf.setLength(MAX_REC_LEN);
}
/**
* Takes component parts and return a record suitable
* for our address book.
*
* return byte[] the newly created record
* first record field: first name
* last record field: last name
* num record field: phone number
*/
public static byte[] createRecord(String first,
String last,
String num) {
clearBuf();
recBuf.insert(FIRST_NAME_INDEX, first);
recBuf.insert(LAST_NAME_INDEX, last);
recBuf.insert(PHONE_INDEX, num);
recBuf.setLength(MAX_REC_LEN);
return recBuf.toString().getBytes();
}
/**
* Extracts the first name field from a record.
* return String contains the first name field
* b the record to parse
*/
public static String getFirstName(byte[] b) {
return new String(b, FIRST_NAME_INDEX, FIELD_LEN).trim();
}
/**
* Extracts the last name field from a record.
* return String contains the last name field
* b the record to parse
*/
public static String getLastName(byte[] b) {
return new String(b, LAST_NAME_INDEX, FIELD_LEN).trim();
}
/**
* Extracts the phone number field from a record.
* return String contains the phone number field
* b the record to parse
*/
public static String getPhoneNum(byte[] b) {
return new String(b, PHONE_INDEX, FIELD_LEN).trim();
}
}
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