--- /dev/null
+/* ====================================================================
+ 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.StringReader;
+import java.util.Iterator;
+import java.util.List;
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+
+import org.apache.poi.util.POILogFactory;
+import org.apache.poi.util.POILogger;
+import org.apache.poi.xssf.model.Table;
+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.helpers.XSSFSingleXmlCell;
+import org.apache.poi.xssf.usermodel.helpers.XSSFXmlColumnPr;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+import com.sun.org.apache.xml.internal.utils.PrefixResolver;
+import com.sun.org.apache.xml.internal.utils.PrefixResolverDefault;
+
+
+/**
+ *
+ * Imports data from an external XML to an XLSX to an XML according to one of the mapping defined.
+ *
+ * The output XML Schema must respect this limitations:
+ *
+ * - the input XML must be valid according to the XML Schema used in the mapping
+ * - denormalized table mapping is not supported (see OpenOffice part 4: chapter 3.5.1.7)
+ * - all the namespaces used in the document must be declared in the root node
+ *
+ *
+ * @author Roberto Manicardi
+ *
+ */
+public class XSSFImportFromXML {
+
+ private XSSFMap map;
+
+ private static POILogger logger = POILogFactory.getLogger(XSSFImportFromXML.class);
+
+ public XSSFImportFromXML(XSSFMap map){
+
+ this.map = map;
+
+
+ }
+
+ /**
+ * Imports an XML into the XLSX using the Custom XML mapping defined
+ *
+ * @param xmlInputString the XML to import
+ * @throws SAXException raised if error occurs during XML parsing
+ * @throws XPathExpressionException raised if error occurs during XML navigation
+ */
+ public void importFromXML(String xmlInputString) throws SAXException, XPathExpressionException{
+
+ try{
+
+ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+ factory.setNamespaceAware(true);
+ DocumentBuilder builder = factory.newDocumentBuilder();
+
+ Document doc = builder.parse(new InputSource(new StringReader(xmlInputString.trim())));
+
+ List<XSSFSingleXmlCell> singleXmlCells = map.getRelatedSingleXMLCell();
+
+ List<Table> tables = map.getRelatedTables();
+
+ XPathFactory xpathFactory = XPathFactory.newInstance();
+ XPath xpath = xpathFactory.newXPath();
+
+
+
+ // Setting namespace context to XPath
+ // Assuming that the namespace prefix in the mapping xpath is the same as the one used in the document
+ final PrefixResolver resolver = new PrefixResolverDefault(doc.getDocumentElement());
+
+ NamespaceContext ctx = new NamespaceContext() {
+
+ public String getNamespaceURI(String prefix) {
+ return resolver.getNamespaceForPrefix(prefix);
+ }
+ // Dummy implementation - not used!
+ public Iterator getPrefixes(String val) {
+ return null;
+ }
+ // Dummy implemenation - not used!
+ public String getPrefix(String uri) {
+ return null;
+ }
+ };
+ xpath.setNamespaceContext(ctx);
+
+
+
+
+ for(XSSFSingleXmlCell singleXmlCell :singleXmlCells ){
+
+
+
+ String xpathString = singleXmlCell.getXpath();
+
+ Node result = (Node) xpath.evaluate(xpathString,doc, XPathConstants.NODE);
+ String textContent = result.getTextContent();
+ logger.log(POILogger.DEBUG,"Extracting with xpath "+xpathString+" : value is '"+textContent+"'");
+ XSSFCell cell = singleXmlCell.getReferencedCell();
+ logger.log(POILogger.DEBUG,"Setting '"+textContent+"' to cell "+cell.getColumnIndex()+"-"+cell.getRowIndex()+" in sheet "+cell.getSheet().getSheetName());
+ cell.setCellValue(textContent);
+
+
+
+
+ }
+
+ for(Table table : tables){
+
+ String commonXPath = table.getCommonXpath();
+
+ NodeList result = (NodeList) xpath.evaluate(commonXPath,doc, XPathConstants.NODESET);
+
+ int rowOffset = table.getStartCellReference().getRow()+1;//the first row contains the table header
+ int columnOffset = table.getStartCellReference().getCol()-1;
+
+ for(int i = 0; i< result.getLength();i++){
+
+ // TODO: implement support for denormalized XMLs (see OpenOffice part 4: chapter 3.5.1.7)
+
+ for(XSSFXmlColumnPr xmlColumnPr: table.getXmlColumnPrs()){
+
+ int localColumnId = (int)xmlColumnPr.getId();
+
+ int rowId = rowOffset+i;
+ int columnId = columnOffset+localColumnId;
+
+
+ String localXPath = xmlColumnPr.getLocalXPath();
+ localXPath = localXPath.substring(localXPath.substring(1).indexOf('/')+1);
+
+ // Build an XPath to select the right node (assuming that the commonXPath != "/")
+ String nodeXPath = commonXPath+"["+(i+1)+"]"+localXPath;
+
+
+
+ // TODO: convert the data to the cell format
+ String value = (String) xpath.evaluate(nodeXPath,result.item(i), XPathConstants.STRING);
+ logger.log(POILogger.DEBUG,"Extracting with xpath "+nodeXPath+" : value is '"+value+"'");
+ XSSFRow row = table.getXSSFSheet().getRow(rowId);
+ if(row==null){
+ row = table.getXSSFSheet().createRow(rowId);
+ }
+
+ XSSFCell cell = row.getCell(columnId);
+ if(cell==null){
+ cell = row.createCell(columnId);
+ }
+ logger.log(POILogger.DEBUG,"Setting '"+value+"' to cell "+cell.getColumnIndex()+"-"+cell.getRowIndex()+" in sheet "+table.getXSSFSheet().getSheetName());
+ cell.setCellValue(value.trim());
+
+ }
+
+
+
+ }
+
+
+
+ }
+ }catch(IOException e){
+ //Thrown by StringReader
+ e.printStackTrace();
+ }catch(ParserConfigurationException e){
+ //Thrown by DocumentBuilderFactory
+ e.printStackTrace();
+ }
+
+ }
+
+
+}
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