} catch (final IOException e) {
            throw new DictionaryException("Failed to access dictionaries", e);
        }
    }

    public OptionalEntity<DictionaryFile<? extends DictionaryItem>> getDictionaryFile(final String id) {
        for (final DictionaryFile<? extends DictionaryItem> dictFile : getDictionaryFiles()) {
            if (dictFile.getId().equals(id)) {
                return OptionalEntity.of(dictFile);

            return (List<KuromojiItem>) kuromojiList;
        }).orElse(Collections.emptyList());
    }

    public OptionalEntity<KuromojiFile> getKuromojiFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(KuromojiFile.class::isInstance)
                .map(file -> OptionalEntity.of((KuromojiFile) file)).orElse(OptionalEntity.empty());
    }

        }).orElse(Collections.emptyList());
    }

    public OptionalEntity<CharMappingFile> getCharMappingFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(CharMappingFile.class::isInstance)
                .map(file -> OptionalEntity.of((CharMappingFile) file)).orElse(OptionalEntity.empty());
    }

            return (List<ProtwordsItem>) protwordsList;
        }).orElse(Collections.emptyList());
    }

    public OptionalEntity<ProtwordsFile> getProtwordsFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(ProtwordsFile.class::isInstance)
                .map(file -> OptionalEntity.of((ProtwordsFile) file)).orElse(OptionalEntity.empty());
    }

        }).orElse(Collections.emptyList());
    }

    public OptionalEntity<StemmerOverrideFile> getStemmerOverrideFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(StemmerOverrideFile.class::isInstance)
                .map(file -> OptionalEntity.of((StemmerOverrideFile) file)).orElse(OptionalEntity.empty());
    }

            return (List<StopwordsItem>) stopwordsList;
        }).orElse(Collections.emptyList());
    }

    public OptionalEntity<StopwordsFile> getStopwordsFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(StopwordsFile.class::isInstance)
                .map(file -> OptionalEntity.of((StopwordsFile) file)).orElse(OptionalEntity.empty());
    }

            return (List<SynonymItem>) synonymList;
        }).orElse(Collections.emptyList());
    }

    public OptionalEntity<SynonymFile> getSynonymFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(SynonymFile.class::isInstance)
                .map(file -> OptionalEntity.of((SynonymFile) file)).orElse(OptionalEntity.empty());
    }