new_photon: Initialize a photon instance

Description

Initialize a photon instance by creating a new photon object. This object is stored in the R session and can be used to perform geocoding requests.

Instances can either be local or remote. Remote instances require nothing more than a URL that geocoding requests are sent to. Local instances require the setup of the photon executable, a search index, and Java. See photon_local for details.

Usage

new_photon(
  path = NULL,
  url = NULL,
  photon_version = NULL,
  country = NULL,
  date = "latest",
  exact = FALSE,
  section = NULL,
  opensearch = TRUE,
  mount = TRUE,
  overwrite = FALSE,
  quiet = FALSE
)

Value

An R6 object of class photon.

Arguments

path: Path to a directory where the photon executable and data should be stored. Defaults to a directory "photon" in the current working directory. If NULL, a remote instance is set up based on the url parameter.
url: URL of a photon server to connect to. If NULL and path is also NULL, connects to the public API under https://photon.komoot.io/.
photon_version: Version of photon to be used. A list of all releases can be found here: https://github.com/komoot/photon/releases/. Ignored if jar is given. If NULL, uses the latest known version.
country: Character string that can be identified by countryname as a country. An extract for this country will be downloaded. If "planet", downloads a global search index. If NULL, downloads no index and leaves download or import to the user.
date: Character string or date-time object used to specify the creation date of the search index. If "latest", will download the file tagged with "latest". If a character string, the value should be parseable by as.POSIXct. If exact = FALSE, the input value is compared to all available dates and the closest date will be selected. Otherwise, a file will be selected that exactly matches the input to date.
exact: If TRUE, exactly matches the date. Otherwise, selects the date with lowest difference to the date parameter.
section: Subdirectory of the download server from which to select a search index. If "experimental", selects a dump made for the master version of photon. If "archived", selects a dump made for an older version of photon. If NULL (or any arbitrary string), selects a dump made for the current release. Defaults to NULL.
opensearch: If TRUE, attempts to download the OpenSearch version of photon. OpenSearch-based photon supports structrued geocoding. Readily available OpenSearch photon executables are only offered since photon version 0.6.0. For earlier versions, you need to build it from source using gradle. In this case, if TRUE, will look for an OpenSearch version of photon in the specified path. Since photon version 0.7.0, OpenSearch is the recommended option. Defaults to TRUE.
mount: If TRUE, mounts the object to the session so that functions like geocode automatically detect the new instance. If FALSE, initializies the instance but doesn't mount it to the session. Defaults to TRUE.
overwrite: If TRUE, overwrites existing jar files and search indices when initializing a new instance. Defaults to FALSE.
quiet: If TRUE, suppresses all informative messages.

Examples

Run this code

# connect to public API
photon <- new_photon()

# connect to arbitrary server
photon <- new_photon(url = "https://photonserver.org")

if (has_java("11")) {
# set up a local instance in a temporary directory
dir <- file.path(tempdir(), "photon")
photon <- new_photon(dir, country = "Monaco")
}

photon$purge(ask = FALSE)

Run the code above in your browser using DataLab