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#############################################################################
#
# XLConnect
# Copyright (C) 2010-2024 Mirai Solutions GmbH
#
# 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 <https://www.gnu.org/licenses/>.
#
#############################################################################
#############################################################################
#
# Creates a Java RDataFrameWrapper instance from a data.frame (non-data.frame
# objects are coerced to data.frame's). The resulting jobjRef instance (rJava)
# can be used when calling Java methods.
#
# This is used when writing data.frame's to Excel workbooks.
#
# Author: Martin Studer, Mirai Solutions GmbH
#
#############################################################################
dataframeToJava <- function(df) {
jTryCatch({
# Force data.frame
df = as.data.frame(df)
dFrame = new(J("com.miraisolutions.xlconnect.integration.r.RDataFrameWrapper"))
cnames = colnames(df)
for(i in seq(along = df)) {
v = df[, i]
if(is(v, "numeric")) {
.jcall(dFrame, "V", "addNumericColumn", cnames[i], .jarray(as.double(v)), .jarray(is.na(v)))
}
else if(is(v, "logical")) {
.jcall(dFrame, "V", "addBooleanColumn", cnames[i], .jarray(v), .jarray(is.na(v)))
}
else if(is(v, "character")) {
.jcall(dFrame, "V", "addStringColumn", cnames[i], .jarray(v), .jarray(is.na(v)))
}
else if(is(v, "POSIXt")) {
.jcall(dFrame, "V", "addDateTimeColumn", cnames[i], .jarray(.jlong(as.numeric(v) * 1000)), .jarray(is.na(v)))
} else if(is(v, "Date")) {
# Important: dates (without time) are treated as being at midnight UTC
.jcall(dFrame, "V", "addDateTimeColumn", cnames[i], .jarray(.jlong(as.numeric(as.POSIXct(v)) * 1000)), .jarray(is.na(v)))
} else { # e.g. factor or any other type
v = as.character(v)
if(length(v) != nrow(df))
stop(sprintf("Conversion to character for column %s failed! Check the class.", cnames[i]))
.jcall(dFrame, "V", "addStringColumn", cnames[i], .jarray(v), .jarray(is.na(v)))
}
}
dFrame
})
}
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