import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
public class ContactList
{
private static final byte IDENTIFIER = Contact.NAME_PARM;
private List<Contact> contacts;
private Map<String, Contact> contactCache;
public ContactList()
{
super();
contacts = new LinkedList<Contact>();
contactCache = new HashMap<String, Contact>();
}
public synchronized void addContact(Contact contact)
{
if(contact == null)
throw new NullPointerException();
contacts.add(contact);
updateCache(contact);
}
public synchronized void addContact(String... data)
{
Contact contact = new Contact();
for(byte b = 0, size = (byte) data.length; b < size; b++)
contact.setParameter(data[b], b);
addContact(contact);
}
public synchronized Contact getContact(String identifier)
{
Contact contact = contactCache.get(identifier);
if(contact != null && contact.getParameter(IDENTIFIER).equals(identifier))
return(contact);
for(Contact c:contacts)
{
if(c != null && c.getParameter(IDENTIFIER).equals(identifier))
{
updateCache(c);
return(c);
}
}
return(null);
}
private void updateCache(Contact c)
{
String identifer = c.getParameter(IDENTIFIER);
if(identifer != null && identifer.trim().length() != 0)
contactCache.put(identifer, c);
}
public static void main(String[] args)
{
ContactList contactList = new ContactList();
contactList.addContact("Volvagia", "2345", "Brunn@Gebirge", "178.77.101.236");
Contact contact = contactList.getContact("Volvagia");
System.out.println("Name:\t" + contact.getParameter(Contact.NAME_PARM));
System.out.println("PLZ:\t" + contact.getParameter(Contact.PLZ_PARM));
System.out.println("Ort:\t" + contact.getParameter(Contact.LOCATION_PARM));
System.out.println("Homep.:\t" + contact.getParameter(Contact.WEBSITE_PARM));
}
}
import java.util.HashSet;
public class Contact
{
public static final byte NAME_PARM = 0;
public static final byte PLZ_PARM = NAME_PARM + 1;
public static final byte LOCATION_PARM = PLZ_PARM + 1;
public static final byte WEBSITE_PARM = LOCATION_PARM + 1;
private static final byte PARM_COUNT = WEBSITE_PARM + 1;
private static final byte FIRST_PARM = NAME_PARM;
private static final String DEFAULT_NULL_STRING = "";
private static final HashSet<Byte> NUMBERS_ONLY_SET = new HashSet<Byte>() {
{
add(PLZ_PARM);
}
};
private String[] data;
public Contact()
{
super();
data = new String[PARM_COUNT];
}
public String getParameter(byte field)
{
if(field < FIRST_PARM || field > (PARM_COUNT - 1))
throw new IllegalArgumentException("Field out of bounds. :'(");
return(data[field] != null ? data[field] : DEFAULT_NULL_STRING);
}
public void setParameter(int parm, byte field)
{
setParameter(String.valueOf(parm), field);
}
public void setParameter(String parm, byte field)
{
if(field < FIRST_PARM || field > (PARM_COUNT - 1))
throw new IllegalArgumentException("Field out of bounds. :'(");
if(NUMBERS_ONLY_SET.contains(field) && !isNumberic(parm))
throw new IllegalArgumentException("Parameter isn't numeric on a numeric Field. :O");
data[field] = parm;
}
private boolean isNumberic(String parm)
{
for(int i = 0, size = parm.length(); i < size; i++)
{
char c = parm.charAt(i);
if(!Character.isDigit(c))
return(false);
}
return(true);
}
}
