org.tritonus.share.StringHashedSet Maven / Gradle / Ivy
/*
* StringHashedSet.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 2000 by Florian Bomers
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
|<--- this code is formatted to fit into 80 columns --->|
*/
package org.tritonus.share;
import java.util.Collection;
import java.util.Iterator;
import org.tritonus.share.ArraySet;
/**
* A set where the elements are uniquely referenced by their
* string representation as given by the objects toString()
* method. No 2 objects with the same toString() can
* be in the set.
*
* The contains(Object elem) and get(Object elem)
* methods can be called with Strings as elem parameter.
* For get(Object elem), the object that has been added
* is returned, and not its String representation.
*
* Though it's possible to store
* Strings as objects in this class, it doesn't make sense
* as you could use ArraySet for that equally well.
*
* You shouldn't use the ArrayList specific functions
* like those that take index parameters.
*
* It is not possible to add null elements.
*/
public class StringHashedSet extends ArraySet
{
private static final long serialVersionUID = 1;
public StringHashedSet()
{
super();
}
public StringHashedSet(Collection c)
{
super(c);
}
public boolean add(E elem)
{
if (elem==null) {
return false;
}
return super.add(elem);
}
public boolean contains(Object elem)
{
if (elem==null) {
return false;
}
String comp=elem.toString();
Iterator it=iterator();
while (it.hasNext()) {
if (comp.equals(it.next().toString())) {
return true;
}
}
return false;
}
public E get(Object elem) {
if (elem==null) {
return null;
}
String comp=elem.toString();
Iterator it=iterator();
while (it.hasNext()) {
E thisElem=it.next();
if (comp.equals(thisElem.toString())) {
return thisElem;
}
}
return null;
}
}
/*** StringHashedSet.java ***/