ObjectReferenceImpl objectMirror()

in src/main/java/com/jetbrains/jdi/VirtualMachineImpl.java [1475:1545]
53 lines of code
12 McCabe index (conditional complexity)

    ObjectReferenceImpl objectMirror(long id, int tag) {

      synchronized (state) {
        // Handle any queue elements that are not strongly reachable
        processQueue();

        if (id == 0) {
            return null;
        }
        ObjectReferenceImpl object = null;
        Long key = id;

        /*
         * Attempt to retrieve an existing object reference
         */
        SoftObjectReference ref = objectsByID.get(key);
        if (ref != null) {
            object = ref.object();
        }

        /*
         * If the object wasn't in the table, or it's soft reference was
         * cleared, create a new instance.
         */
        if (object == null) {
            switch (tag) {
                case JDWP.Tag.OBJECT:
                    object = new ObjectReferenceImpl(vm, id);
                    break;
                case JDWP.Tag.STRING:
                    object = new StringReferenceImpl(vm, id);
                    break;
                case JDWP.Tag.ARRAY:
                    object = new ArrayReferenceImpl(vm, id);
                    break;
                case JDWP.Tag.THREAD:
                    ThreadReferenceImpl thread =
                        new ThreadReferenceImpl(vm, id);
                    thread.addListener(this);
                    object = thread;
                    break;
                case JDWP.Tag.THREAD_GROUP:
                    object = new ThreadGroupReferenceImpl(vm, id);
                    break;
                case JDWP.Tag.CLASS_LOADER:
                    object = new ClassLoaderReferenceImpl(vm, id);
                    break;
                case JDWP.Tag.CLASS_OBJECT:
                    object = new ClassObjectReferenceImpl(vm, id);
                    break;
                default:
                    throw new IllegalArgumentException("Invalid object tag: " + tag);
            }
            ref = new SoftObjectReference(key, object, referenceQueue);

            /*
             * If there was no previous entry in the table, we add one here
             * If the previous entry was cleared, we replace it here.
             */
            objectsByID.put(key, ref);
            if ((traceFlags & TRACE_OBJREFS) != 0) {
                printTrace("Creating new " +
                           object.getClass().getName() + " (id = " + id + ")");
            }
        } else {
            ref.incrementCount();
        }

        return object;
      }
    }