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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.extractor;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Vector;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ooxml.util.DocumentHelper;
import org.apache.poi.util.LocaleUtil;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFMap;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFTable;
import org.apache.poi.xssf.usermodel.XSSFTableColumn;
import org.apache.poi.xssf.usermodel.helpers.XSSFSingleXmlCell;
import org.apache.poi.xssf.usermodel.helpers.XSSFXmlColumnPr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
*
* Maps an XLSX to an XML according to one of the mapping defined.
*
*
* The output XML Schema must respect this limitations:
*
*
* - all mandatory elements and attributes must be mapped (enable validation to check this)
*
* - no <any> in complex type/element declaration
* - no <anyAttribute> attributes declaration
* - no recursive structures: recursive structures can't be nested more than one level
* - no abstract elements: abstract complex types can be declared but must not be used in elements.
* - no mixed content: an element can't contain simple text and child element(s) together
* - no <substitutionGroup> in complex type/element declaration
*
*/
public class XSSFExportToXml implements Comparator{
private static final POILogger LOG = POILogFactory.getLogger(XSSFExportToXml.class);
private XSSFMap map;
private final HashMap indexMap = new HashMap<>();
/**
* Creates a new exporter and sets the mapping to be used when generating the XML output document
*
* @param map the mapping rule to be used
*/
public XSSFExportToXml(XSSFMap map) {
this.map = map;
}
/**
*
* Exports the data in an XML stream
*
* @param os OutputStream in which will contain the output XML
* @param validate if true, validates the XML against the XML Schema
* @throws SAXException If validating the document fails
* @throws TransformerException If transforming the document fails
*/
public void exportToXML(OutputStream os, boolean validate) throws SAXException, TransformerException {
exportToXML(os, "UTF-8", validate);
}
/**
* Exports the data in an XML stream
*
* @param os OutputStream in which will contain the output XML
* @param encoding the output charset encoding
* @param validate if true, validates the XML against the XML Schema
* @throws SAXException If validating the document fails
* @throws TransformerException If transforming the document fails
*/
public void exportToXML(OutputStream os, String encoding, boolean validate) throws SAXException, TransformerException{
List singleXMLCells = map.getRelatedSingleXMLCell();
List tables = map.getRelatedTables();
String rootElement = map.getCtMap().getRootElement();
Document doc = DocumentHelper.createDocument();
final Element root;
if (isNamespaceDeclared()) {
root = doc.createElementNS(getNamespace(),rootElement);
} else {
root = doc.createElementNS("", rootElement);
}
doc.appendChild(root);
List xpaths = new Vector<>();
Map singleXmlCellsMappings = new HashMap<>();
Map tableMappings = new HashMap<>();
for(XSSFSingleXmlCell simpleXmlCell : singleXMLCells) {
xpaths.add(simpleXmlCell.getXpath());
singleXmlCellsMappings.put(simpleXmlCell.getXpath(), simpleXmlCell);
}
for(XSSFTable table : tables) {
String commonXPath = table.getCommonXpath();
xpaths.add(commonXPath);
tableMappings.put(commonXPath, table);
}
indexMap.clear();
xpaths.sort(this);
indexMap.clear();
for(String xpath : xpaths) {
XSSFSingleXmlCell simpleXmlCell = singleXmlCellsMappings.get(xpath);
XSSFTable table = tableMappings.get(xpath);
if (!xpath.matches(".*\\[.*")) {
// Exports elements and attributes mapped with simpleXmlCell
if (simpleXmlCell!=null) {
XSSFCell cell = simpleXmlCell.getReferencedCell();
if (cell!=null) {
Node currentNode = getNodeByXPath(xpath,doc.getFirstChild(),doc,false);
mapCellOnNode(cell,currentNode);
//remove nodes which are empty in order to keep the output xml valid
// FIXME: what should be done if currentNode.getTextContent() is null?
if ("".equals(currentNode.getTextContent()) && currentNode.getParentNode() != null) {
currentNode.getParentNode().removeChild(currentNode);
}
}
}
// Exports elements and attributes mapped with tables
if (table!=null) {
List tableColumns = table.getColumns();
XSSFSheet sheet = table.getXSSFSheet();
int startRow = table.getStartCellReference().getRow() + table.getHeaderRowCount();
int endRow = table.getEndCellReference().getRow();
for(int i = startRow; i<= endRow; i++) {
XSSFRow row = sheet.getRow(i);
Node tableRootNode = getNodeByXPath(table.getCommonXpath(), doc.getFirstChild(), doc, true);
short startColumnIndex = table.getStartCellReference().getCol();
for (XSSFTableColumn tableColumn : tableColumns) {
XSSFCell cell = row.getCell(startColumnIndex + tableColumn.getColumnIndex());
if (cell != null) {
XSSFXmlColumnPr xmlColumnPr = tableColumn.getXmlColumnPr();
if (xmlColumnPr != null) {
String localXPath = xmlColumnPr.getLocalXPath();
Node currentNode = getNodeByXPath(localXPath,tableRootNode,doc,false);
mapCellOnNode(cell, currentNode);
}
}
}
}
}
} /*else {
// TODO: implement filtering management in xpath
}*/
}
boolean isValid = true;
if (validate) {
isValid =isValid(doc);
}
if (isValid) {
/////////////////
//Output the XML
//set up a transformer
TransformerFactory transfac = TransformerFactory.newInstance();
Transformer trans = transfac.newTransformer();
trans.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
trans.setOutputProperty(OutputKeys.INDENT, "yes");
trans.setOutputProperty(OutputKeys.ENCODING, encoding);
//create string from xml tree
StreamResult result = new StreamResult(os);
DOMSource source = new DOMSource(doc);
trans.transform(source, result);
}
}
/**
* Validate the generated XML against the XML Schema associated with the XSSFMap
*
* @param xml the XML to validate
* @return true, if document is valid
* @throws SAXException If validating the document fails
*/
private boolean isValid(Document xml) throws SAXException{
try{
String language = "http://www.w3.org/2001/XMLSchema";
SchemaFactory factory = SchemaFactory.newInstance(language);
Source source = new DOMSource(map.getSchema());
Schema schema = factory.newSchema(source);
Validator validator = schema.newValidator();
validator.validate(new DOMSource(xml));
//if no exceptions where raised, the document is valid
return true;
} catch(IOException e) {
LOG.log(POILogger.ERROR, "document is not valid", e);
}
return false;
}
private void mapCellOnNode(XSSFCell cell, Node node) {
String value ="";
switch (cell.getCellType()) {
case STRING: value = cell.getStringCellValue(); break;
case BOOLEAN: value += cell.getBooleanCellValue(); break;
case ERROR: value = cell.getErrorCellString(); break;
case FORMULA:
if (cell.getCachedFormulaResultType() == CellType.STRING) {
value = cell.getStringCellValue();
} else {
if (DateUtil.isCellDateFormatted(cell)) {
value = getFormattedDate(cell);
} else {
value += cell.getNumericCellValue();
}
}
break;
case NUMERIC:
if (DateUtil.isCellDateFormatted(cell)) {
value = getFormattedDate(cell);
} else {
value += cell.getRawValue();
}
break;
default:
}
if (node instanceof Element) {
Element currentElement = (Element) node;
currentElement.setTextContent(value);
} else {
node.setNodeValue(value);
}
}
private String removeNamespace(String elementName) {
return elementName.matches(".*:.*")?elementName.split(":")[1]:elementName;
}
private String getFormattedDate(XSSFCell cell) {
DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.ROOT);
sdf.setTimeZone(LocaleUtil.getUserTimeZone());
return sdf.format(cell.getDateCellValue());
}
private Node getNodeByXPath(String xpath,Node rootNode,Document doc,boolean createMultipleInstances) {
String[] xpathTokens = xpath.split("/");
Node currentNode =rootNode;
// The first token is empty, the second is the root node
for(int i =2; i