Method put

app/src/main/java/androidx/emoji2/text/MetadataRepo.java:215–223

Add a TypefaceEmojiRasterizer to the index.

(@NonNull final TypefaceEmojiRasterizer data)

     *
     */
    @RestrictTo(RestrictTo.Scope.LIBRARY)
    @VisibleForTesting
    void put(@NonNull final TypefaceEmojiRasterizer data) {
        Preconditions.checkNotNull(data, "emoji metadata cannot be null");
        Preconditions.checkArgument(data.getCodepointsLength() > 0,
                "invalid metadata codepoint length");

        mRootNode.put(data, 0, data.getCodepointsLength() - 1);
    }

    /**
     * Trie node that holds mapping from emoji codepoint(s) to TypefaceEmojiRasterizer.