Questionable instance of PSC_PRESIZE_COLLECTIONS

[nmatt]

PSC_PRESIZE_COLLECTIONS is reported on code of the form:

    List<Foo> allFoos = new ArrayList<>();

    for (Bar bar : bars) {
        allFoos.add(bar.getFoo());

        for (Baz baz : bar.getBazs()) {
            allFoos.add(baz.getFoo());
        }

        for (Qux qux : bar.getQuxs()) {
            allFoos.add(qux.getFoo());
        }
    }

    for (Quz quz : quzs) {
        allFoos.add(quzs.getFoo());
    }

While it is true that the required capacity could be precomputed, this would basically double the source code size, be prone to errors, and not be maintenance-friendly. In cases like this, it is not really "known a priori (or at least can be reasonably guessed) how many items are going to be placed in the collection" as claimed by the bug description.

I would suggest to not report this bug pattern if such nested iterations are present, i.e. if the capacity parameter requires more than a simple arithmetic expression (like "foo.size() + bar.size()").