Java tutorial
/*! * This program is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software * Foundation. * * You should have received a copy of the GNU Lesser General Public License along with this * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html * or from the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details. * * Copyright (c) 2002-2017 Hitachi Vantara.. All rights reserved. */ package org.pentaho.reporting.engine.classic.extensions.datasources.cda; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.pentaho.reporting.engine.classic.core.ReportDataFactoryException; import org.pentaho.reporting.engine.classic.core.util.TypedTableModel; import org.pentaho.reporting.libraries.base.util.StringUtils; import org.pentaho.reporting.libraries.xmlns.parser.ParseException; import org.xml.sax.Attributes; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import org.xml.sax.helpers.DefaultHandler; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import java.io.IOException; import java.io.InputStream; import java.math.BigDecimal; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.Locale; public class CdaResponseParser extends DefaultHandler { private static final Log logger = LogFactory.getLog(CdaResponseParser.class); private TypedTableModel model = new TypedTableModel(); private ArrayList<String> columnRawData; private StringBuffer characterBuffer; private int rowNumber; private boolean nullValue; private SimpleDateFormat format; public CdaResponseParser() { format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ", Locale.US); model = new TypedTableModel(); } public TypedTableModel getResult() { return model; } public void startElement(final String uri, final String localName, final String qName, final Attributes attributes) throws SAXException { if ("ColumnMetaData".equals(qName)) { final String type = attributes.getValue("type"); final String name = attributes.getValue("name"); if (StringUtils.isEmpty(name)) { throw new ParseException("Column name is not given"); } if (StringUtils.isEmpty(type)) { throw new ParseException("Column type is not given"); } final Class colType; if ("Numeric".equals(type) || "Integer".equals(type)) { colType = Number.class; } else if ("Date".equals(type)) { colType = Date.class; } else { colType = String.class; } model.addColumn(name, colType); } else if ("Row".equals(qName)) { columnRawData = new ArrayList<String>(); } else if ("Col".equals(qName)) { if ("true".equals(attributes.getValue("isNull"))) { nullValue = true; characterBuffer = null; } else { nullValue = false; characterBuffer = new StringBuffer(); } } } public void endElement(final String uri, final String localName, final String qName) throws SAXException { try { if ("Row".equals(qName)) { final int size = Math.min(columnRawData.size(), model.getColumnCount()); for (int i = 0; i < size; i++) { final String value = columnRawData.get(i); if (value == null) { model.setValueAt(value, rowNumber, i); } else { final Class columnClass = model.getColumnClass(i); if (Date.class == columnClass) { model.setValueAt(format.parse(value), rowNumber, i); } else if (Number.class == columnClass) { model.setValueAt(new BigDecimal(value), rowNumber, i); } else { model.setValueAt(value, rowNumber, i); } } } rowNumber += 1; columnRawData = null; } else if ("Col".equals(qName)) { if (nullValue) { columnRawData.add(null); } else { columnRawData.add(characterBuffer.toString()); } nullValue = false; characterBuffer = null; } } catch (Exception e) { throw new ParseException(e); } } public void characters(final char[] ch, final int start, final int length) throws SAXException { if (characterBuffer != null) { characterBuffer.append(ch, start, length); } } public static TypedTableModel performParse(final InputStream postResult) throws IOException, ReportDataFactoryException { try { final CdaResponseParser contentHandler = new CdaResponseParser(); final SAXParserFactory factory = SAXParserFactory.newInstance(); final SAXParser parser = factory.newSAXParser(); final XMLReader reader = parser.getXMLReader(); try { reader.setFeature("http://xml.org/sax/features/xmlns-uris", false); } catch (SAXException e) { // ignored } try { reader.setFeature("http://xml.org/sax/features/namespaces", false); reader.setFeature("http://xml.org/sax/features/namespace-prefixes", false); } catch (final SAXException e) { logger.warn("No Namespace features will be available. (Yes, this is serious)", e); } reader.setContentHandler(contentHandler); reader.parse(new InputSource(postResult)); return (contentHandler.getResult()); } catch (final ParserConfigurationException e) { throw new ReportDataFactoryException("Failed to init XML system", e); } catch (final SAXException e) { throw new ReportDataFactoryException("Failed to parse document", e); } } }