R/R-Helper.R

In 52North/sos4R: Client for OGC Sensor Observation Services

############################################################################## #
# Copyright (C) 2019 by 52 North                                               #
# Initiative for Geospatial Open Source Software GmbH                          #
#                                                                              #
# Contact: Andreas Wytzisk                                                     #
# 52 North Initiative for Geospatial Open Source Software GmbH                 #
# Martin-Luther-King-Weg 24                                                    #
# 48155 Muenster, Germany                                                      #
# info@52north.org                                                             #
#                                                                              #
# This program is free software; you can redistribute and/or modify it under   #
# the terms of the GNU General Public License version 2 as published by the    #
# Free Software Foundation.                                                    #
#                                                                              #
# This program is distributed WITHOUT ANY WARRANTY; even without the implied   #
# WARRANTY OF MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU #
# General Public License for more details.                                     #
#                                                                              #
# You should have received a copy of the GNU General Public License along with #
# this program (see gpl-2.0.txt). If not, write to the Free Software           #
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA or #
# visit the Free Software Foundation web page, http://www.fsf.org              #
#                                                                              #
# Author: Eike Hinderk Jürrens (e.h.juerrens@52north.org)                      #
# Created: 2018-11-23                                                          #
# Project: sos4R - https://github.com/52North/sos4R                            #
#                                                                              #
############################################################################## #
#
# Helper function to check if the given list field is available.
#
# Returns TRUE in the case of not NULL and a list with min 1 element
#
sosIsListFieldAvailable <- function(listField) {
  is(listField, "list") &&
    length(listField) > 0 &&
    !any(sapply(listField, is.na)) &&
    all(sapply(listField, is, "character")) &&
    all(sapply(listField, nchar) > 0)
}