@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (getClass() != obj.getClass())
			return false;
		ForeignKey other = (ForeignKey) obj;
		if (source == null) {
			if (other.source != null)
				return false;
		} else if (!source.equals(other.source))
			return false;
		if (target == null) {
			if (other.target != null)
				return false;
		} else if (!target.equals(other.target))
			return false;
		return true;
	}