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Apache POI - Java API To Access Microsoft Format Files
/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ====================================================================
*/
package org.apache.poi.xssf.streaming;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FormulaError;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.util.TempFile;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.STCellType;
/**
* Initially copied from BigGridDemo "SpreadsheetWriter".
* Unlike the original code which wrote the entire document,
* this class only writes the "sheetData" document fragment
* so that it was renamed to "SheetDataWriter"
*/
public class SheetDataWriter {
private final File _fd;
private final Writer _out;
private int _rownum;
private int _numberOfFlushedRows;
private int _lowestIndexOfFlushedRows; // meaningful only of _numberOfFlushedRows>0
private int _numberOfCellsOfLastFlushedRow; // meaningful only of _numberOfFlushedRows>0
private int _numberLastFlushedRow = -1; // meaningful only of _numberOfFlushedRows>0
/**
* Table of strings shared across this workbook.
* If two cells contain the same string, then the cell value is the same index into SharedStringsTable
*/
private SharedStringsTable _sharedStringSource;
public SheetDataWriter() throws IOException {
_fd = createTempFile();
_out = createWriter(_fd);
}
public SheetDataWriter(SharedStringsTable sharedStringsTable) throws IOException{
this();
this._sharedStringSource = sharedStringsTable;
}
/**
* Create a temp file to write sheet data.
* By default, temp files are created in the default temporary-file directory
* with a prefix "poi-sxssf-sheet" and suffix ".xml". Subclasses can override
* it and specify a different temp directory or filename or suffix, e.g. .gz
*
* @return temp file to write sheet data
*/
public File createTempFile() throws IOException {
return TempFile.createTempFile("poi-sxssf-sheet", ".xml");
}
/**
* Create a writer for the sheet data.
*
* @param fd the file to write to
*/
public Writer createWriter(File fd)throws IOException {
return new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fd), "UTF-8"));
}
/**
* flush and close the temp data writer.
* This method must be invoked before calling {@link #getWorksheetXMLInputStream()}
*/
public void close() throws IOException{
_out.flush();
_out.close();
}
File getTempFile(){
return _fd;
}
/**
* @return a stream to read temp file with the sheet data
*/
public InputStream getWorksheetXMLInputStream() throws IOException {
File fd = getTempFile();
return new FileInputStream(fd);
}
public int getNumberOfFlushedRows() {
return _numberOfFlushedRows;
}
public int getNumberOfCellsOfLastFlushedRow() {
return _numberOfCellsOfLastFlushedRow;
}
public int getLowestIndexOfFlushedRows() {
return _lowestIndexOfFlushedRows;
}
public int getLastFlushedRow() {
return _numberLastFlushedRow;
}
@Override
protected void finalize() throws Throwable {
_fd.delete();
super.finalize();
}
/**
* Write a row to the file
*
* @param rownum 0-based row number
* @param row a row
*/
public void writeRow(int rownum, SXSSFRow row) throws IOException {
if (_numberOfFlushedRows == 0)
_lowestIndexOfFlushedRows = rownum;
_numberLastFlushedRow = Math.max(rownum, _numberLastFlushedRow);
_numberOfCellsOfLastFlushedRow = row.getLastCellNum();
_numberOfFlushedRows++;
beginRow(rownum, row);
Iterator cells = row.allCellsIterator();
int columnIndex = 0;
while (cells.hasNext()) {
writeCell(columnIndex++, cells.next());
}
endRow();
}
void beginRow(int rownum, SXSSFRow row) throws IOException {
_out.write("\n");
this._rownum = rownum;
}
void endRow() throws IOException {
_out.write(" \n");
}
public void writeCell(int columnIndex, Cell cell) throws IOException {
if (cell == null) {
return;
}
String ref = new CellReference(_rownum, columnIndex).formatAsString();
_out.write("");
break;
}
case Cell.CELL_TYPE_FORMULA: {
_out.write(">");
_out.write("");
outputQuotedString(cell.getCellFormula());
_out.write(" ");
switch (cell.getCachedFormulaResultType()) {
case Cell.CELL_TYPE_NUMERIC:
double nval = cell.getNumericCellValue();
if (!Double.isNaN(nval)) {
_out.write("" + nval + " ");
}
break;
}
break;
}
case Cell.CELL_TYPE_STRING: {
if (_sharedStringSource != null) {
XSSFRichTextString rt = new XSSFRichTextString(cell.getStringCellValue());
int sRef = _sharedStringSource.addEntry(rt.getCTRst());
_out.write(" t=\"" + STCellType.S.toString() + "\">");
_out.write("");
_out.write(String.valueOf(sRef));
_out.write(" ");
} else {
_out.write(" t=\"inlineStr\">");
_out.write("");
outputQuotedString(cell.getStringCellValue());
_out.write(" " + cell.getNumericCellValue() + " ");
break;
}
case Cell.CELL_TYPE_BOOLEAN: {
_out.write(" t=\"b\">");
_out.write("" + (cell.getBooleanCellValue() ? "1" : "0") + " ");
break;
}
case Cell.CELL_TYPE_ERROR: {
FormulaError error = FormulaError.forInt(cell.getErrorCellValue());
_out.write(" t=\"e\">");
_out.write("" + error.getString() + " ");
break;
}
default: {
throw new RuntimeException("Huh?");
}
}
_out.write(" ");
}
/**
* @return whether the string has leading / trailing spaces that
* need to be preserved with the xml:space=\"preserve\" attribute
*/
boolean hasLeadingTrailingSpaces(String str) {
if (str != null && str.length() > 0) {
char firstChar = str.charAt(0);
char lastChar = str.charAt(str.length() - 1);
return Character.isWhitespace(firstChar) || Character.isWhitespace(lastChar) ;
}
return false;
}
//Taken from jdk1.3/src/javax/swing/text/html/HTMLWriter.java
protected void outputQuotedString(String s) throws IOException {
if (s == null || s.length() == 0) {
return;
}
char[] chars = s.toCharArray();
int last = 0;
int length = s.length();
for (int counter = 0; counter < length; counter++) {
char c = chars[counter];
switch (c) {
case '<':
if (counter > last) {
_out.write(chars, last, counter - last);
}
last = counter + 1;
_out.write("<");
break;
case '>':
if (counter > last) {
_out.write(chars, last, counter - last);
}
last = counter + 1;
_out.write(">");
break;
case '&':
if (counter > last) {
_out.write(chars, last, counter - last);
}
last = counter + 1;
_out.write("&");
break;
case '"':
if (counter > last) {
_out.write(chars, last, counter - last);
}
last = counter + 1;
_out.write(""");
break;
// Special characters
case '\n':
case '\r':
if (counter > last) {
_out.write(chars, last, counter - last);
}
_out.write("
");
last = counter + 1;
break;
case '\t':
if (counter > last) {
_out.write(chars, last, counter - last);
}
_out.write(" ");
last = counter + 1;
break;
case 0xa0:
if (counter > last) {
_out.write(chars, last, counter - last);
}
_out.write(" ");
last = counter + 1;
break;
default:
// YK: XmlBeans silently replaces all ISO control characters ( < 32) with question marks.
// the same rule applies to unicode surrogates and "not a character" symbols.
if( c < ' ' || Character.isLowSurrogate(c) || Character.isHighSurrogate(c) ||
('\uFFFE' <= c && c <= '\uFFFF')) {
if (counter > last) {
_out.write(chars, last, counter - last);
}
_out.write('?');
last = counter + 1;
}
else if (c > 127) {
if (counter > last) {
_out.write(chars, last, counter - last);
}
last = counter + 1;
// If the character is outside of ascii, write the
// numeric value.
_out.write("&#");
_out.write(String.valueOf((int) c));
_out.write(";");
}
break;
}
}
if (last < length) {
_out.write(chars, last, length - last);
}
}
/**
* Deletes the temporary file that backed this sheet on disk.
* @return true if the file was deleted, false if it wasn't.
*/
boolean dispose() throws IOException {
_out.close();
return _fd.delete();
}
}
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