public void move()

in src/main/java/org/apache/bcel/generic/InstructionList.java [873:921]
46 lines of code
13 McCabe index (conditional complexity)

    public void move(final InstructionHandle start, final InstructionHandle end, final InstructionHandle target) {
        // Step 1: Check constraints
        if (start == null || end == null) {
            throw new ClassGenException("Invalid null handle: From " + start + " to " + end);
        }
        if (target == start || target == end) {
            throw new ClassGenException("Invalid range: From " + start + " to " + end + " contains target " + target);
        }
        for (InstructionHandle ih = start; ih != end.getNext(); ih = ih.getNext()) {
            if (ih == null) {
                throw new ClassGenException("Invalid range: From " + start + " to " + end);
            }
            if (ih == target) {
                throw new ClassGenException("Invalid range: From " + start + " to " + end + " contains target " + target);
            }
        }
        // Step 2: Temporarily remove the given instructions from the list
        final InstructionHandle prev = start.getPrev();
        InstructionHandle next = end.getNext();
        if (prev != null) {
            prev.setNext(next);
        } else {
            this.start = next;
        }
        if (next != null) {
            next.setPrev(prev);
        } else {
            this.end = prev;
        }
        start.setPrev(end.setNext(null));
        // Step 3: append after target
        if (target == null) { // append to start of list
            if (this.start != null) {
                this.start.setPrev(end);
            }
            end.setNext(this.start);
            this.start = start;
        } else {
            next = target.getNext();
            target.setNext(start);
            start.setPrev(target);
            end.setNext(next);
            if (next != null) {
                next.setPrev(end);
            } else {
                this.end = end;
            }
        }
    }