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Add support for streaming API. #47

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Add support for streaming API. #47

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df3e52d
Add support for streaming API.
bagl Apr 18, 2016
f9ae849
Make with-streaming-workbook! a function
bagl Apr 19, 2016
21b3ab3
Remove trailing whitespace
bagl Apr 19, 2016
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37 changes: 36 additions & 1 deletion src/dk/ative/docjure/spreadsheet.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
(java.io FileOutputStream FileInputStream InputStream OutputStream)
(java.util Date Calendar)
(org.apache.poi.xssf.usermodel XSSFWorkbook)
(org.apache.poi.xssf.streaming SXSSFWorkbook)
(org.apache.poi.hssf.usermodel HSSFWorkbook)
(org.apache.poi.ss.usermodel Workbook Sheet Cell Row
FormulaError
Expand Down Expand Up @@ -186,7 +187,7 @@
(when new-key
{new-key (read-cell cell)})))

(defn select-columns
(defn select-columns
"Takes two arguments: column hashmap and a sheet. The column hashmap
specifies the mapping from spreadsheet columns dictionary keys:
its keys are the spreadsheet column names and the values represent
Expand Down Expand Up @@ -289,6 +290,40 @@
(add-rows! sheet data)
workbook))

(defn with-streaming-workbook!
"Creates new XLSX workbook.
body-fn takes as an argument function that appends new
row to the worksheet. Works in streaming mode with constant
memory requirements.

Example:
(with-streaming-workbook! \"Test.xlsx\" \"SHEETNAME\"
(fn [append-row!]
(doseq [i (range 2000)]
(append-row! (range i)))))"
[file-name sheet-name body-fn]
(let [wb (SXSSFWorkbook. 1)
^Sheet sh (add-sheet! wb sheet-name)
row-num (atom 0)
append-row!
(fn [row-data]
(let [r (.createRow sh @row-num)]
(swap! row-num inc)
(doseq [[j value] (map-indexed #(list %1 %2) row-data)]
(set-cell! (.createCell r j) value))))]
(try
(body-fn append-row!)
(save-workbook-into-file! file-name wb)
(finally
(.dispose wb)))))

(defn save-data-to-xlsx!
"Create new XLSX workbook and stream data into the sheet."
[file-name sheet-name data]
(with-streaming-workbook! file-name sheet-name
(fn [append-row!]
(doseq [row data] (append-row! row)))))

(defn create-xls-workbook
"Create a new XLS workbook with a single sheet and the data specified."
[sheet-name data]
Expand Down