Utils.assert(str instanceof SIRContainer, "Expected container as target of fusion, but got: " + str);
assert (str instanceof SIRContainer): "Expected container as target of fusion, but got: " + str;
    public SIRStream doMyTransform(SIRStream str) {	// make sure we have a container	Utils.assert(str instanceof SIRContainer, "Expected container as target of fusion, but got: " + str);	// if we have as many partitions as children, then we're done	if (((SIRContainer)str).size()==partitions.size()-1) {	    return str;	}