Examples with DefaultConnectionCursor graphql.relay.DefaultConnectionCursor used on opensource projects

Example 1 with DefaultConnectionCursor

use of graphql.relay.DefaultConnectionCursor in project blaze-persistence by Blazebit.

the class GraphQLEntityViewSupport method createRelayConnection.

/**
 * Returns a relay connection from the given result list.
 *
 * @param list the result list
 * @return the relay connection
 */
public <T> Connection<T> createRelayConnection(List<T> list) {
    List<Edge<T>> edges = new ArrayList<>(list.size());
    boolean hasPreviousPage;
    boolean hasNextPage;
    KeysetPage keysetPage;
    if (list instanceof PagedList<?>) {
        PagedList<T> data = (PagedList<T>) list;
        hasPreviousPage = data.getFirstResult() != 0;
        hasNextPage = data.getTotalSize() == -1 || data.getFirstResult() + data.getMaxResults() < data.getTotalSize();
        keysetPage = data.getKeysetPage();
    } else {
        hasPreviousPage = true;
        hasNextPage = true;
        keysetPage = null;
    }
    if (keysetPage == null) {
        for (int i = 0; i < list.size(); i++) {
            edges.add(new DefaultEdge<>(list.get(i), new DefaultConnectionCursor(Integer.toString(i + 1))));
        }
    } else {
        PagedList<T> data = (PagedList<T>) list;
        List<Keyset> keysets = keysetPage.getKeysets();
        int listSize = list.size();
        if (listSize != 0 && keysets.size() != listSize) {
            int end = listSize - 1;
            edges.add(new DefaultEdge<>(list.get(0), new DefaultConnectionCursor(Base64.getEncoder().encodeToString(serializeCursor(data.getFirstResult(), data.getMaxResults(), keysetPage.getLowest().getTuple())))));
            for (int i = 1; i < end; i++) {
                T node = list.get(i);
                edges.add(new DefaultEdge<>(node, new DefaultConnectionCursor(Integer.toString(i + 1))));
            }
            edges.add(new DefaultEdge<>(list.get(end), new DefaultConnectionCursor(Base64.getEncoder().encodeToString(serializeCursor(data.getFirstResult(), data.getMaxResults(), keysetPage.getHighest().getTuple())))));
        } else {
            for (int i = 0; i < list.size(); i++) {
                T node = list.get(i);
                edges.add(new DefaultEdge<>(node, new DefaultConnectionCursor(Base64.getEncoder().encodeToString(serializeCursor(data.getFirstResult(), data.getMaxResults(), keysets.get(i).getTuple())))));
            }
        }
    }
    PageInfo pageInfo;
    if (edges.isEmpty()) {
        pageInfo = new DefaultPageInfo(null, null, hasPreviousPage, hasNextPage);
    } else {
        pageInfo = new DefaultPageInfo(edges.get(0).getCursor(), edges.get(edges.size() - 1).getCursor(), hasPreviousPage, hasNextPage);
    }
    return new DefaultConnection<>(edges, pageInfo);
}