public boolean reclaim()

in environment/src/main/java/jetbrains/exodus/tree/btree/BTreeMutable.java [297:361]
62 lines of code
20 McCabe index (conditional complexity)

    public boolean reclaim(@NotNull RandomAccessLoggable loggable,
                           @NotNull final Iterator<RandomAccessLoggable> loggables) {
        final BTreeReclaimTraverser context = new BTreeReclaimTraverser(this);
        final long nextFileAddress = log.getFileAddress(loggable.getAddress()) + log.getFileLengthBound();
        loop:
        while (true) {
            final byte type = loggable.getType();
            switch (type) {
                case NullLoggable.TYPE:
                case HashCodeLoggable.TYPE:
                    break;
                case LEAF_DUP_BOTTOM_ROOT:
                case LEAF_DUP_INTERNAL_ROOT:
                    context.dupLeafsLo.clear();
                    context.dupLeafsHi.clear();
                    new LeafNodeDup(this, loggable).reclaim(context);
                    break;
                case LEAF:
                    new LeafNode(log, loggable).reclaim(context);
                    break;
                case BOTTOM_ROOT:
                case INTERNAL_ROOT:
                    if (loggable.getAddress() == immutableTree.getRootAddress()) {
                        context.wasReclaim = true;
                    }
                    break loop; // txn ended
                case BOTTOM:
                    reclaimBottom(loggable, context);
                    break;
                case INTERNAL:
                    reclaimInternal(loggable, context);
                    break;
                case DUP_LEAF:
                case DUP_BOTTOM:
                case DUP_INTERNAL:
                    context.dupLeafsLo.clear();
                    context.dupLeafsHi.clear();
                    final RandomAccessLoggable leaf = LeafNodeDup.collect(context.dupLeafsHi, loggable, loggables);
                    if (leaf == null) {
                        break loop; // loggable of dup leaf type not found, txn ended prematurely
                    }
                    new LeafNodeDup(this, leaf).reclaim(context);
                    break;
                default:
                    throw new ExodusException("Unexpected loggable type " + type);
            }
            if (!loggables.hasNext()) {
                break;
            }
            if (type == NullLoggable.TYPE) {
                break;
            }
            loggable = loggables.next();
            if (loggable.getAddress() >= nextFileAddress) {
                break;
            }
        }

        while (context.canMoveUp()) {
            // wire up mutated stuff
            context.popAndMutate();
        }

        return context.wasReclaim;
    }