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/* ==========================================
* JGraphT : a free Java graph-theory library
* ==========================================
*
* Project Info: http://jgrapht.sourceforge.net/
* Project Creator: Barak Naveh (http://sourceforge.net/users/barak_naveh)
*
* (C) Copyright 2003-2010, by Barak Naveh and Contributors.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
/* ------------------------------
* UnionFindTest.java
* ------------------------------
* (C) Copyright 2010-2010, by Tom Conerly and Contributors.
*
* Original Author: Tom Conerly
* Contributor(s): -
*
* Changes
* -------
* 02-Feb-2010 : Initial revision (TC);
*
*/
package org.jgrapht.alg.util;
import java.util.*;
import junit.framework.*;
/**
* .
*
* @author Tom Conerly
*/
public class UnionFindTest
extends TestCase
{
//~ Methods ----------------------------------------------------------------
/**
* .
*/
public void testUnionFind()
{
TreeSet<String> set = new TreeSet<String>();
String [] strs = { "aaa", "bbb", "ccc", "ddd", "eee" };
ArrayList<ArrayList<String>> sets = new ArrayList<ArrayList<String>>();
for (String str : strs) {
set.add(str);
sets.add(new ArrayList<String>());
sets.get(sets.size() - 1).add(str);
}
UnionFind<String> uf = new UnionFind<String>(set);
testIdentical(strs, sets, uf);
uf.union(strs[0], strs[1]);
union(sets, strs[0], strs[1]);
testIdentical(strs, sets, uf);
uf.union(strs[2], strs[3]);
union(sets, strs[2], strs[3]);
testIdentical(strs, sets, uf);
uf.union(strs[2], strs[4]);
union(sets, strs[2], strs[4]);
testIdentical(strs, sets, uf);
uf.union(strs[2], strs[4]);
union(sets, strs[2], strs[4]);
testIdentical(strs, sets, uf);
uf.union(strs[0], strs[4]);
union(sets, strs[0], strs[4]);
testIdentical(strs, sets, uf);
}
private void union(ArrayList<ArrayList<String>> sets, String a, String b)
{
ArrayList<String> toAdd = new ArrayList<String>();
for (int i = 0; i < sets.size(); i++) {
if (sets.get(i).contains(a)) {
toAdd.addAll(sets.get(i));
sets.remove(i);
break;
}
}
for (int i = 0; i < sets.size(); i++) {
if (sets.get(i).contains(b)) {
toAdd.addAll(sets.get(i));
sets.remove(i);
break;
}
}
sets.add(toAdd);
}
private boolean same(ArrayList<ArrayList<String>> sets, String a, String b)
{
for (ArrayList<String> set : sets) {
if (set.contains(a) && set.contains(b)) {
return true;
}
}
return false;
}
private void testIdentical(
String [] universe,
ArrayList<ArrayList<String>> sets,
UnionFind<String> uf)
{
for (String a : universe) {
for (String b : universe) {
boolean same1 = uf.find(a).equals(uf.find(b));
boolean same2 = same(sets, a, b);
assertEquals(same1, same2);
}
}
}
}
// End UnionFindTest.java
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