@Override
        public OutputStream getOutputStream() {
            if (outputStream == null) {
                final Map<String, ByteArrayOutputStream> typeMap = getOpenOutputStream().get(meta.getId());
                outputStream = typeMap.get(streamTypeName);
            }
            return outputStream;
        }
Gets the output stream for this stream target.
stroom-data/stroom-data-store-mock/src/main/java/stroom/data/store/mock/MockStore.java