public boolean hasNext()

in generator/src/main/java/org/apache/kafka/message/checker/FieldSpecPairIterator.java [47:101]
55 lines of code
24 McCabe index (conditional complexity)

    public boolean hasNext() {
        if (next != null) {
            return true;
        }
        FieldSpec field1 = iterator1.hasNext() ? iterator1.next() : null;
        while (field1 != null) {
            FieldDomain domain1 = FieldDomain.of(field1, topLevelVersions1, topLevelVersions2);
            switch (domain1) {
                case MESSAGE1_ONLY:
                    field1 = iterator1.hasNext() ? iterator1.next() : null;
                    break;
                case BOTH: {
                    FieldSpec field2 = iterator2.hasNext() ? iterator2.next() : null;
                    while (field2 != null) {
                        FieldDomain domain2 = FieldDomain.of(field2, topLevelVersions1, topLevelVersions2);
                        switch (domain2) {
                            case MESSAGE2_ONLY:
                                field2 = iterator2.hasNext() ? iterator2.next() : null;
                                break;
                            case BOTH:
                                next = new FieldSpecPair(field1, field2);
                                return true;
                            case MESSAGE1_ONLY:
                            case NEITHER:
                                throw new UnificationException("field2 " + field2.name() + " is present in " +
                                    "message2, but should not be, based on its versions.");
                        }
                    }
                    field1 = iterator1.hasNext() ? iterator1.next() : null;
                    break;
                }
                case MESSAGE2_ONLY:
                case NEITHER:
                    throw new UnificationException("field1 " + field1.name() + " is present in " +
                        "message1, but should not be, based on its versions.");
            }
        }
        FieldSpec field2 = iterator2.hasNext() ? iterator2.next() : null;
        while (field2 != null) {
            FieldDomain domain2 = FieldDomain.of(field2, topLevelVersions1, topLevelVersions2);
            switch (domain2) {
                case MESSAGE1_ONLY:
                case NEITHER:
                    throw new UnificationException("field2 " + field2.name() + " is present in " +
                        "message2, but should not be, based on its versions.");
                case BOTH:
                    throw new UnificationException("field2 " + field2.name() + " should be present " +
                        "in message1, but is not, based on its versions.");
                case MESSAGE2_ONLY:
                    field2 = iterator2.hasNext() ? iterator2.next() : null;
                    break;
            }
        }
        return false;
    }