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datamart (version 0.3.2)

urldata: Constructor for UrlData objects

Description

Constructor for UrlData objects

Usage

urldata(template, map.lst = list(), scrape.lst = list(),
    map.fct = NULL, extract.fct = readLines,
    transform.fct = identity, clss = "UrlData")

Arguments

template
a pattern for the url. Must contain for substitution. Required.
map.lst
A named list that maps the resource to parameters for the template url. If the template requires more than one parameter, use a list. Default is an empty list.
map.fct
a function that maps the resource to parameters for the template url. Use this parameter if map.lst is not flexible enough. The default behaviour if this parameter is not provided is a lookup on map.lst
scrape.lst
a named list (name=resource, value=list of options) that can be stored in a local database.
extract.fct
a function that takes an URI and returns the raw data. Default readLines.
transform.fct
a function that takes the raw data and returns the cleaned/transformed data. Default identity.
clss
name of the class to create. Default UrlData, must be inherited from this class.