?? mappingprocessor.java
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package cz.cvut.felk.cs.metamorphoses.mapping;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.CDATASection;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;/** * <p>The main class of the mapping layer.</p> * @author Martin Svihla */public class MappingProcessor { private static final String MAPPING_NS = "http://www.svihla.net/metamorphoses/mapping.dtd"; Document mapping; String jdbcUrl; String jdbcDriver; String username; String password; /** * Create mapping connection instance (reads the mapping document from file and read database connection data) * @param mapping document filename Filename * @throws MappingProcessorException when processor initialization fails */ public MappingProcessor(String mappingFilename) throws MappingProcessorException { this.loadMapping(mappingFilename); this.readDBConnection(); } /** * Loads mapping document and builds DOM out of it. * @param mapping document filename filename * @throws MappingProcessorException */ protected void loadMapping(String filename) throws MappingProcessorException { try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setNamespaceAware(true); DocumentBuilder builder = factory.newDocumentBuilder(); mapping = builder.parse(filename); } catch (IOException e) { throw new MappingProcessorException(filename + " not found.", e); } catch (Exception e) { throw new MappingProcessorException("Mapping document parsing failed.", e); } } /* public void readNS() { NodeList list = this.mapping.getElementsByTagName("Namespace"); for (int i = 0; i < list.getLength(); i++) { Element elem = (Element) list.item(i); this.namespaces.put( elem.getAttributeNS(MappingProcessor.MAPPING_NS, "prefix"), elem.getAttributeNS(MappingProcessor.MAPPING_NS, "namespace")); } } */ /** * Returns content of header tag from mapping document. * @return String content of RDF header. */ public String getHeader() { NodeList list = mapping.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.DOCUMENT_HEADER); Element elem = (Element) list.item(list.getLength() - 1); return getCDataContent(elem); } /** * Returns content of foot tag from mapping document. * @return String content of RDF footer. */ public String getFoot() { NodeList list = mapping.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.DOCUMENT_FOOT); Element elem = (Element) list.item(list.getLength() - 1); return getCDataContent(elem); } /** * Gets content of CDATA from XML element * @param Element XML element * @return CDATA content */ private String getCDataContent(Element elem) { String data = ""; if (elem != null) { if ((elem.getChildNodes().item(1) != null) & (elem.getChildNodes().item(1).getNodeType() == Node.CDATA_SECTION_NODE)) { CDATASection content = (CDATASection) elem.getChildNodes().item(1); data = content.getData(); } } return data; } /** * Reads database connection configuration from a mapping document. * @throws MappingProcessorException */ private void readDBConnection() throws MappingProcessorException { NodeList db = mapping.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.DATABASE_CONNECTON); if (db.getLength() == 0) { throw new MappingProcessorException("No database connection tag in mapping."); } Element elem = (Element) db.item(db.getLength() - 1); if (elem != null) { if (elem.hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.JDBC_URL)) this.jdbcUrl = elem.getAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.JDBC_URL); if (elem.hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.JDBC_DRIVER)) this.jdbcDriver = elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.JDBC_DRIVER); if (elem.hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.DB_USER)) this.username = elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.DB_USER); if (elem.hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.DB_PASSWORD)) this.password = elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.DB_PASSWORD); } } /** * Creates list of all class names in the mapping (class name = template name in this case) * @return list of strings */ public List getAllClassNames() { List nameList = new ArrayList(); NodeList classes = mapping.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.CLASS); for (int i = 0, n = classes.getLength(); i < n; i++) { Element elem = (Element) classes.item(i); if (elem .hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME)) { nameList.add( elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME)); } } return nameList; } /** * Processor returns MappingClass with a specified template name. * @param String template name * @return MappingClass */ public MappingClass getClassByTemplateName(String templateName) { NodeList classes = mapping.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.CLASS); Element elem, processedClass = null; for (int i = 0, n = classes.getLength(); i < n; i++) { elem = (Element) classes.item(i); if (elem != null) { if (elem .hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME) & (elem .getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME) .equals(templateName))) { processedClass = elem; break; } } } if (processedClass == null) return null; String rdfLabel = null, sql = null; if (processedClass .hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.RDF_LABEL)) { rdfLabel = processedClass.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.RDF_LABEL); } if (processedClass.hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.SQL)) sql = processedClass.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.SQL); MappingClass mc = new MappingClass(templateName, rdfLabel, sql); NodeList list; //conditions list = processedClass.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.CONDITION); for (int i = 0, n = list.getLength(); i < n; i++) { elem = (Element) list.item(i); //try { mc.getConditions().put( elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME), createCondition(elem)); //} catch (Exception e) { // throw new MappingProcessorException( // "Processing condition from class " + templateName, // e); //} } // variables list = processedClass.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.VARIABLE); String variableName; for (int i = 0, n = list.getLength(); i < n; i++) { elem = (Element) list.item(i); //try { variableName = elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME); mc.getVariables().put( variableName, elem.getAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.SQL_NAME)); //} catch (Exception e) { // throw new MappingProcessorException( // "Processing variable from class " + templateName, // e); //} } // properties list = processedClass.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.PROPERTY); for (int i = 0, n = list.getLength(); i < n; i++) { elem = (Element) list.item(i); //try { mc.getProperties().put( elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME), createProperty(elem)); //} catch (Exception e) { // throw new MappingProcessorException( // "Processing property from class " + templateName, // e); //} } // attributes mc.setAttributes(createAttributeList(processedClass)); return mc; } /** * Creates a MappingProperty object from XML element mmm:Property. * @param Element property element * @return created MappingProperty */ private MappingProperty createProperty(Element propertyElement) { MappingProperty property; //try { String containerType = ""; if (propertyElement.hasAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.CONTAINER_TYPE)) { containerType = propertyElement.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.CONTAINER_TYPE); } property = new MappingProperty( propertyElement.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.RDF_LABEL), propertyElement.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.SQL_NAME), propertyElement.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.PREFIX), propertyElement.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.SUFFIX), containerType, createAttributeList(propertyElement)); // } catch (Exception e) { // throw new MappingProcessorException( // "Processing property from class " + templateName, // e); // } return property; } /** * Creates a MappingCondition object from XML element mmm:ClassCondition * @param Element property element * @return created MappingCondition */ private MappingCondition createCondition(Element elem) { return new MappingCondition( elem.getAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.TEMPLATE_NAME), elem.getAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.SQL_WHERE_STRING), elem.getAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.SQL_TABLE_STRING), elem.getAttributeNS(MappingProcessor.MAPPING_NS, MappingTags.COMMENT)); } /** * Returns list of attributes of a MappingClass or MappingProperty object from XML element mmm:Class or mmm:Property * @param Element class or property element * @return List list of MappingAtributes */ private ArrayList createAttributeList(Element element) { ArrayList attributes = new ArrayList(); NodeList list = element.getElementsByTagNameNS( MappingProcessor.MAPPING_NS, MappingTags.ATTRIBUTE); for (int i = 0, n = list.getLength(); i < n; i++) { Element elem = (Element) list.item(i); //elem. if (elem.getParentNode().equals(element)) { MappingAttribute ma = new MappingAttribute( elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.RDF_LABEL), elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.SQL_NAME), elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.PREFIX), elem.getAttributeNS( MappingProcessor.MAPPING_NS, MappingTags.SUFFIX)); attributes.add(ma); } } return attributes; } /** * @return */ public String getJdbcDriver() { return jdbcDriver; } /** * @return */ public String getJdbcUrl() { return jdbcUrl; } /** * @return */ public String getPassword() { return password; } /** * @return */ public String getUsername() { return username; } /* public static void main(String args[]) throws MappingProcessorException { MappingProcessor proc = new MappingProcessor("resources/mapping1.xml"); proc.readDBConnection(); System.err.println(proc.jdbcDriver); MappingClass mc = null; //try { mc = proc.getClassByTemplateName("person"); //} catch (MappingProcessorException e) { //} ///System.out.println(mc.getSql()); ///System.out.println(mc.getPropertyRdf().get("firstName")); } */}?? 快捷鍵說明
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