public void forEach(final BiConsumer<String, ExplorerActionHandler> consumer) {
        getHandlers().allHandlers.forEach((type, handler) -> {
            if (handler != null) {
                consumer.accept(type, handler);
            }
        });
    }
@param consumer {@link BiConsumer} of the document type and {@link ExplorerActionHandler}
stroom-explorer/stroom-explorer-impl/src/main/java/stroom/explorer/impl/ExplorerActionHandlers.java