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org.dhatim.fastexcel.reader.RowSpliterator Maven / Gradle / Ivy
/*
* Copyright 2016 Dhatim.
*
* Licensed 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.dhatim.fastexcel.reader;
import javax.xml.stream.XMLStreamException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.util.*;
import java.util.function.Consumer;
import java.util.function.Function;
import static org.dhatim.fastexcel.reader.DefaultXMLInputFactory.factory;
class RowSpliterator implements Spliterator {
private final SimpleXmlReader r;
private final ReadableWorkbook workbook;
private final HashMap sharedFormula = new HashMap<>();
private final HashMap arrayFormula = new HashMap<>();
private int rowCapacity = 16;
public RowSpliterator(ReadableWorkbook workbook, InputStream inputStream) throws XMLStreamException {
this.workbook = workbook;
this.r = new SimpleXmlReader(factory, inputStream);
r.goTo("sheetData");
}
@Override
public boolean tryAdvance(Consumer action) {
try {
if (hasNext()) {
action.accept(next());
return true;
} else {
return false;
}
} catch (XMLStreamException e) {
throw new ExcelReaderException(e);
}
}
@Override
public Spliterator trySplit() {
return null;
}
@Override
public long estimateSize() {
return Long.MAX_VALUE;
}
@Override
public int characteristics() {
return DISTINCT | IMMUTABLE | NONNULL | ORDERED;
}
private boolean hasNext() throws XMLStreamException {
if (r.goTo(() -> r.isStartElement("row") || r.isEndElement("sheetData"))) {
return "row".equals(r.getLocalName());
} else {
return false;
}
}
private Row next() throws XMLStreamException {
if (!"row".equals(r.getLocalName())) {
throw new NoSuchElementException();
}
int rowIndex = r.getIntAttribute("r");
List cells = new ArrayList<>(rowCapacity);
int physicalCellCount = 0;
while (r.goTo(() -> r.isStartElement("c") || r.isEndElement("row"))) {
if ("row".equals(r.getLocalName())) {
break;
}
Cell cell = parseCell();
CellAddress addr = cell.getAddress();
ensureSize(cells, addr.getColumn() + 1);
cells.set(addr.getColumn(), cell);
physicalCellCount++;
}
rowCapacity = Math.max(rowCapacity, cells.size());
return new Row(rowIndex, physicalCellCount, cells);
}
private Cell parseCell() throws XMLStreamException {
String cellRef = r.getAttribute("r");
CellAddress addr = new CellAddress(cellRef);
String type = r.getOptionalAttribute("t").orElse("n");
String styleString = r.getAttribute("s");
String formatId = null;
String formatString = null;
if (styleString != null) {
int index = Integer.parseInt(styleString);
if (index < workbook.getFormats().size()) {
formatId = workbook.getFormats().get(index);
formatString = workbook.getNumFmtIdToFormat().get(formatId);
}
}
if ("inlineStr".equals(type)) {
return parseInlineStr(addr);
} else if ("s".equals(type)) {
return parseString(addr);
} else {
return parseOther(addr, type, formatId, formatString);
}
}
private Cell parseOther(CellAddress addr, String type, String dataFormatId, String dataFormatString)
throws XMLStreamException {
CellType definedType = parseType(type);
Function parser = getParserForType(definedType);
Object value = null;
String formula = null;
String rawValue = null;
while (r.goTo(() -> r.isStartElement("v") || r.isEndElement("c") || r.isStartElement("f"))) {
if ("v".equals(r.getLocalName())) {
rawValue = r.getValueUntilEndElement("v");
try {
value = "".equals(rawValue) ? null : parser.apply(rawValue);
} catch (ExcelReaderException e) {
if (workbook.getReadingOptions().isCellInErrorIfParseError()) {
definedType = CellType.ERROR;
} else {
throw e;
}
}
} else if ("f".equals(r.getLocalName())) {
String ref = r.getAttribute("ref");
String t = r.getAttribute("t");
String si = r.getAttribute("si");
Integer siInt = si == null ? null : Integer.parseInt(si);
formula = r.getValueUntilEndElement("f");
if ("array".equals(t) && ref != null) {
CellRangeAddress range = CellRangeAddress.valueOf(ref);
arrayFormula.put(range, formula);
}
if ("shared".equals(t)) {
if (ref != null) {
CellRangeAddress range = CellRangeAddress.valueOf(ref);
sharedFormula.put(siInt, new BaseFormulaCell(addr, formula, range));
} else {
formula = parseSharedFormula(siInt, addr);
}
}
} else {
break;
}
}
if (formula == null || "".equals(formula)) {
formula = getArrayFormula(addr).orElse(null);
}
if (formula == null && value == null && definedType == CellType.NUMBER) {
return new Cell(workbook, CellType.EMPTY, null, addr, null, rawValue);
} else {
CellType cellType = (formula != null) ? CellType.FORMULA : definedType;
return new Cell(workbook, cellType, value, addr, formula, rawValue, dataFormatId, dataFormatString);
}
}
private String parseSharedFormula(Integer si, CellAddress addr) {
BaseFormulaCell baseFormulaCell = sharedFormula.get(si);
int dRow = addr.getRow() - baseFormulaCell.getBaseCelAddr().getRow();
int dCol = addr.getColumn() - baseFormulaCell.getBaseCelAddr().getColumn();
String baseFormula = baseFormulaCell.getFormula();
return parseSharedFormula(dCol, dRow, baseFormula);
}
/**
* @see here
*/
private String parseSharedFormula(Integer dCol, Integer dRow, String baseFormula) {
String res = "";
int start = 0;
boolean stringLiteral = false;
for (int end = 0; end < baseFormula.length(); end++) {
char c = baseFormula.charAt(end);
if ('"' == c) {
stringLiteral = !stringLiteral;
}
if (stringLiteral) {
continue;// Skip characters in quotes
}
if (c >= 'A' && c <= 'Z' || c == '$') {
res += baseFormula.substring(start, end);
start = end;
end++;
boolean foundNum = false;
for (; end < baseFormula.length(); end++) {
char idc = baseFormula.charAt(end);
if (idc >= '0' && idc <= '9' || idc == '$') {
foundNum = true;
} else if (idc >= 'A' && idc <= 'Z') {
if (foundNum) {
break;
}
} else {
break;
}
}
if (foundNum) {
String cellID = baseFormula.substring(start, end);
res += shiftCell(cellID, dCol, dRow);
start = end;
}
}
}
if (start < baseFormula.length()) {
res += baseFormula.substring(start);
}
return res;
}
/**
* @see here
*/
private String shiftCell(String cellID, Integer dCol, Integer dRow) {
CellAddress cellAddress = new CellAddress(cellID);
int fCol = cellAddress.getColumn();
int fRow = cellAddress.getRow();
String signCol = "", signRow = "";
if (cellID.indexOf("$") == 0) {
signCol = "$";
} else {
// Shift column
fCol += dCol;
}
if (cellID.lastIndexOf("$") > 0) {
signRow = "$";
} else {
// Shift row
fRow += dRow;
}
String colName = CellAddress.convertNumToColString(fCol);
return signCol + colName + signRow + (++fRow);
}
private Cell parseString(CellAddress addr) throws XMLStreamException {
r.goTo(() -> r.isStartElement("v") || r.isEndElement("c"));
if (r.isEndElement("c")) {
return empty(addr, CellType.STRING);
}
String v = r.getValueUntilEndElement("v");
if (v.isEmpty()) {
return empty(addr, CellType.STRING);
}
int index = Integer.parseInt(v);
String sharedStringValue = workbook.getSharedStringsTable().getItemAt(index);
Object value = sharedStringValue;
String formula = null;
String rawValue = sharedStringValue;
return new Cell(workbook, CellType.STRING, value, addr, formula, rawValue);
}
private Cell empty(CellAddress addr, CellType type) {
return new Cell(workbook, type, "", addr, null, "");
}
private Cell parseInlineStr(CellAddress addr) throws XMLStreamException {
Object value = null;
String formula = null;
String rawValue = null;
while (r.goTo(() -> r.isStartElement("is") || r.isEndElement("c") || r.isStartElement("f"))) {
if ("is".equals(r.getLocalName())) {
rawValue = r.getValueUntilEndElement("is");
value = rawValue;
} else if ("f".equals(r.getLocalName())) {
formula = r.getValueUntilEndElement("f");
} else {
break;
}
}
CellType cellType = formula == null ? CellType.STRING : CellType.FORMULA;
return new Cell(workbook, cellType, value, addr, formula, rawValue);
}
private Optional getArrayFormula(CellAddress addr) {
for (Map.Entry entry : arrayFormula.entrySet()) {
if (entry.getKey().isInRange(addr.getRow(), addr.getColumn())) {
return Optional.of(entry.getValue());
}
}
return Optional.empty();
}
private CellType parseType(String type) {
switch (type) {
case "b":
return CellType.BOOLEAN;
case "e":
return CellType.ERROR;
case "n":
return CellType.NUMBER;
case "str":
return CellType.FORMULA;
case "s":
case "inlineStr":
return CellType.STRING;
}
throw new IllegalStateException("Unknown cell type : " + type);
}
private Function getParserForType(CellType type) {
switch (type) {
case BOOLEAN:
return RowSpliterator::parseBoolean;
case NUMBER:
return RowSpliterator::parseNumber;
case FORMULA:
case ERROR:
return Function.identity();
}
throw new IllegalStateException("No parser defined for type " + type);
}
private static BigDecimal parseNumber(String s) {
try {
return new BigDecimal(s);
} catch (NumberFormatException e) {
throw new ExcelReaderException("Cannot parse number : " + s, e);
}
}
private static Boolean parseBoolean(String s) {
if ("0".equals(s)) {
return Boolean.FALSE;
} else if ("1".equals(s)) {
return Boolean.TRUE;
} else {
throw new ExcelReaderException("Invalid boolean cell value: '" + s + "'. Expecting '0' or '1'.");
}
}
private static void ensureSize(List list, int newSize) {
if (list.size() == newSize) {
return;
}
int toAdd = newSize - list.size();
for (int i = 0; i < toAdd; i++) {
list.add(null);
}
}
}
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