org.approvaltests.legacycode.IndexPermutations Maven / Gradle / Ivy
package org.approvaltests.legacycode;
import java.util.Iterator;
public class IndexPermutations implements Iterable, Iterator
{
private final Integer[] sizes;
private Integer[] index;
private boolean finished = false;
public IndexPermutations(Integer[] sizes)
{
this.sizes = sizes;
this.index = new Integer[sizes.length];
for (int i = 0; i < sizes.length; i++)
{
index[i] = 0;
}
}
@Override
public Iterator iterator()
{
return this;
}
@Override
public boolean hasNext()
{
return !finished;
}
@Override
public Integer[] next()
{
Integer[] r = index.clone();
incermentIndex(0);
return r;
}
private void incermentIndex(int index)
{
this.index[index]++;
if (this.index[index].equals(sizes[index]))
{
if (index == sizes.length - 1)
{
finished = true;
return;
}
this.index[index] = 0;
incermentIndex(index + 1);
}
}
@Override
public void remove()
{
throw new RuntimeException("remove not implemented for IndexPermutations");
}
}