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#' Indexes
#'
#' Get all indexes for a given label or for the entire graph database.
#'
#' Omitting the \code{label} argument returns all indexes in the graph database.
#'
#' @param graph A graph object.
#' @param label A character vector.
#'
#' @return A data.frame.
#'
#' @examples
#' \dontrun{
#' graph = startGraph("http://localhost:7474/db/data/")
#' clear(graph)
#'
#' addIndex(graph, "Person", "status")
#' addIndex(graph, "School", "type")
#'
#' getIndex(graph, "Person")
#' getIndex(graph)
#' }
#'
#' @seealso \code{\link{addIndex}}, \code{\link{dropIndex}}
#'
#' @export
getIndex = function(graph, label = character()) UseMethod("getIndex")
#' @export
getIndex.graph = function(graph, label = character()) {
stopifnot(is.character(label))
url = attr(graph, "indexes")
result = http_request(url, "GET")
if (length(result) > 0) {
for(i in 1:length(result)) {
result[[i]]['property_keys'] = result[[i]]['property_keys'][[1]][[1]]
}
} else {
return(invisible())
}
df = do.call(rbind.data.frame, result)
rownames(df) = NULL
if (length(label) > 0) {
df = df[which(df$label == label), ]
}
return(df)
}
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