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