#
# xts: eXtensible time-series
#
# Copyright (C) 2008 Jeffrey A. Ryan jeff.a.ryan @ gmail.com
#
# Contributions from Joshua M. Ulrich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even 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. If not, see <http://www.gnu.org/licenses/>.
`convertIndex` <-
function(x,value) {
indexClass(x) <- value
x
}
tclass <- indexClass <-
function(x) {
class <- attr(attr(x, "index"), "tclass")
if(is.null(class))
attr(x, '.indexCLASS')
else
class
}
`tclass<-` <-
function(x,value) {
UseMethod('tclass<-')
}
`indexClass<-` <-
function(x,value) {
UseMethod('indexClass<-')
}
`tclass<-.xts` <- `indexClass<-.xts` <-
function(x, value) {
if(!is.character(value) && length(value) != 1)
stop('improperly specified value for indexClass')
# remove 'POSIXt' from value, to prevent indexClass(x) <- 'POSIXt'
value <- value[!value %in% "POSIXt"]
if(length(value)==0L)
stop(paste('unsupported',sQuote('indexClass'),'indexing type: POSIXt'))
if(!value[1] %in% c('dates','chron','POSIXlt','POSIXct','Date','timeDate','yearmon','yearqtr','xtime') )
stop(paste('unsupported',sQuote('indexClass'),'indexing type:',as.character(value[[1]])))
# Add 'POSIXt' virtual class
if(value %in% c('POSIXlt','POSIXct'))
value <- c(value,'POSIXt')
attr(x, '.indexCLASS') <- value
# all index related meta-data will be stored in the index
# as attributes
attr(attr(x,'index'), 'tclass') <- value
x
}
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