@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (this.getClass() != obj.getClass())
			return false;
		final Concatenate other = (Concatenate) obj;
		if (this.filter1 == null) {
			if (other.filter1 != null)
				return false;
		} else if (!this.filter1.equals(other.filter1))
			return false;
		if (this.filter2 == null) {
			if (other.filter2 != null)
				return false;
		} else if (!this.filter2.equals(other.filter2))
			return false;
		return super.equals(obj);
	}