package foundation.util;

import java.util.HashSet;

public class CaseInsensitiveSet extends HashSet<String> {

	private static final long serialVersionUID = 1L;

	@Override
	public boolean contains(Object value) {
		if (value == null) {
			return false;
		}
		
		String lower = ((String)value).toLowerCase();
		return super.contains(lower);
	}

	@Override
	public boolean add(String value) {
		if (value == null) {
			return false;
		}
		
		String lower = ((String)value).toLowerCase();
		return super.add(lower);
	}

	@Override
	public boolean remove(Object value) {
		if (value == null) {
			return false;
		}
		
		String lower = ((String)value).toLowerCase();
		return super.remove(lower);
	}
	
}