D-Net

package eu.dnetlib.data.collective.transformation.engine.core;

import java.io.Reader;

import java.io.StringReader;

import java.io.StringWriter;

import java.util.*;

import javax.xml.transform.*;

import javax.xml.transform.stream.StreamResult;

import javax.xml.transform.stream.StreamSource;

import eu.dnetlib.data.collective.transformation.TransformationException;

import eu.dnetlib.data.collective.transformation.core.schema.SchemaInspector;

import eu.dnetlib.data.collective.transformation.rulelanguage.RuleLanguageParser;

import eu.dnetlib.data.collective.transformation.rulelanguage.Rules;

import eu.dnetlib.data.collective.transformation.utils.NamespaceContextImpl;

import net.sf.saxon.expr.instruct.TerminationException;

import net.sf.saxon.lib.FeatureKeys;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.dom4j.*;

import org.dom4j.io.SAXReader;

import org.springframework.core.io.Resource;

// import net.sf.saxon.event.MessageWarner;

/**

 * @author jochen

 */

public class TransformationImpl implements ITransformation {

	private static final String rootElement = "record";

	private final Log log = LogFactory.getLog(TransformationImpl.class);

	protected RuleLanguageParser ruleLanguageParser;

	private Document xslDoc;

	private SAXReader reader = new SAXReader();

	private Transformer transformer;

	private Transformer transformerFailed;

	private StylesheetBuilder stylesheetBuilder;

	// cache static transformation results, valid for one transformation job

	private Map<String, String> staticResults = new LinkedHashMap<String, String>();

	private Map<String, String> jobConstantMap = new HashMap<String, String>();

	//	private MessageWarner mw = new MessageWarner();

	//@javax.annotation.Resource(name = "template")

	private Resource template;

	private Resource schema;

	private Source xsltSyntaxcheckFailed;

	//@Autowired

	private TransformerFactory saxonTransformerFactory;

	public TransformationImpl(TransformerFactory saxonTransformerFactory){

		this.saxonTransformerFactory = saxonTransformerFactory;

	}

	/**

	 * initializes the transformation with the underlying XSL-template

	 */

	public void init() {

		try {

			xslDoc = reader.read(template.getInputStream());

			Resource xslResource = template.createRelative(XSLSyntaxcheckfailed);

			String systemId = xslResource.getURL().toExternalForm();

			xsltSyntaxcheckFailed = new StreamSource(xslResource.getInputStream(), systemId);

		} catch (Throwable e) {

			log.error("cannot initialize this transformation.", e);

			throw new IllegalStateException(e);

		}

	}

	public void addJobConstant(String aKey, String aValue) {

		this.jobConstantMap.put(aKey, aValue);

	}

	/**

	 * creates a new Transformer object using a stylesheet based on the transformation rules

	 */

	public void configureTransformation() throws TransformerConfigurationException {

		saxonTransformerFactory.setAttribute(FeatureKeys.ALLOW_EXTERNAL_FUNCTIONS, Boolean.TRUE);

		Templates templates = null;

		if (this.ruleLanguageParser.isXslStylesheet()) {

			templates = saxonTransformerFactory.newTemplates(new StreamSource(new StringReader(ruleLanguageParser.getXslStylesheet())));

		} else {

			templates = saxonTransformerFactory.newTemplates(new StreamSource(createStylesheet()));

		}

		transformer = templates.newTransformer();

		//((net.sf.saxon.Controller)transformer).setMessageEmitter(mw);

		transformer.setOutputProperty(OutputKeys.INDENT, "yes");

		transformer.setOutputProperty(OutputKeys.METHOD, "xml");

		transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

		Templates templateFailed = saxonTransformerFactory.newTemplates(xsltSyntaxcheckFailed);

		transformerFailed = templateFailed.newTransformer();

		//((net.sf.saxon.Controller)transformerFailed).setMessageEmitter(mw);

	}

	/* (non-Javadoc)

	 * @see eu.dnetlib.data.collective.transformation.engine.core.ITransformation#transformRecord(java.lang.String, int)

	 */

	public String transformRecord(String record, int index) throws TerminationException, TransformationException {

		try {

			StreamSource s = new StreamSource(new StringReader(record));

			StringWriter writer = new StringWriter();

			StreamResult r = new StreamResult(writer);

			transformer.setParameter("index", index);

			transformer.transform(s, r);

			return writer.toString();

		} catch (TerminationException e) {

			log.debug(e.getLocalizedMessage());

			throw e;

		} catch (TransformerException e) {

			log.error(e);

			throw new TransformationException(e);

		}

	}

	public String transformRecord(String record, Map<String, String> parameters) throws TerminationException, TransformationException {

		try {

			StreamSource s = new StreamSource(new StringReader(record));

			StringWriter writer = new StringWriter();

			StreamResult r = new StreamResult(writer);

			for (String key : parameters.keySet()) {

				transformer.setParameter(key, parameters.get(key));

			}

			transformer.transform(s, r);

			return writer.toString();

		} catch (TerminationException e) {

			log.debug(e.getLocalizedMessage());

			throw e;

		} catch (TransformerException e) {

			log.error(e);

			throw new TransformationException(e);

		}

	}

	public String transformRecord(String record, String stylesheetName) throws TransformationException {

		if (!stylesheetName.equals(XSLSyntaxcheckfailed))

			throw new IllegalArgumentException("in TransformationImpl: stylesheetname " + stylesheetName + " is unsupported!");

		try {

			StreamSource s = new StreamSource(new StringReader(record));

			StringWriter w = new StringWriter();

			StreamResult r = new StreamResult(w);

			transformerFailed.transform(s, r);

			return w.toString();

		} catch (TransformerException e) {

			log.error(e);

			throw new TransformationException(e);

		}

	}

	public String dumpStylesheet() {

		return xslDoc.asXML();

		//		StringWriter writer = new StringWriter();

		//		try {

		//			Transformer tXsl = transformer; //.newTransformer();

		//			tXsl.setOutputProperty(OutputKeys.INDENT, "yes");

		//			tXsl.setOutputProperty(OutputKeys.METHOD, "xml");

		//			tXsl.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

		//

		//		StreamResult r = new StreamResult(writer);

		//		Source s = new StreamSource(new StringReader(xslDoc.asXML()));

		//			tXsl.transform(s, r);

		//		} catch (TransformerException e) {

		//			// TODO Auto-generated catch block

		//			e.printStackTrace();

		//		}

		//		return writer.toString();

	}

	/**

	 * @return the resource to access the XSL template

	 */

	public Resource getTemplate() {

		return template;

	}

	/**

	 * sets the XSL template

	 *

	 * @param template - resource to access the XSL template

	 */

	public void setTemplate(Resource template) {

		this.template = template;

	}

	public RuleLanguageParser getRuleLanguageParser() {

		return ruleLanguageParser;

	}

	public void setRuleLanguageParser(RuleLanguageParser ruleLanguageParser) {

		this.ruleLanguageParser = ruleLanguageParser;

	}

	/**

	 * @return the stylesheetBuilder

	 */

	public StylesheetBuilder getStylesheetBuilder() {

		return stylesheetBuilder;

	}

	/**

	 * @param stylesheetBuilder the stylesheetBuilder to set

	 */

	public void setStylesheetBuilder(StylesheetBuilder stylesheetBuilder) {

		this.stylesheetBuilder = stylesheetBuilder;

	}

	/**

	 * @return the transformation rules as String object

	 */

	protected String getTransformationRules() {

		// add job-properties to the rules as variables

		for (String key : jobConstantMap.keySet()) {

			Rules r = new Rules();

			r.setVariable(key);

			r.setConstant("'" + jobConstantMap.get(key) + "'");

			ruleLanguageParser.getVariableMappingRules().put(JOBCONST_DATASINKID, r);

		}

		if (this.stylesheetBuilder == null) {

			// create DMF compliant stylesheet builder

			this.stylesheetBuilder = new StylesheetBuilder(saxonTransformerFactory);

			this.stylesheetBuilder.setRuleLanguageParser(this.ruleLanguageParser);

			NamespaceContextImpl namespaceContext = new NamespaceContextImpl();

			for (String prefix : ruleLanguageParser.getNamespaceDeclarations().keySet()) {

				namespaceContext.addNamespace(prefix, ruleLanguageParser.getNamespaceDeclarations().get(prefix));

			}

			SchemaInspector inspector = new SchemaInspector();

			try {

				inspector.inspect(this.schema.getURL(), rootElement);

			} catch (Exception e) {

				throw new IllegalStateException(e);

			}

			this.stylesheetBuilder.setNamespaceContext(namespaceContext);

			this.stylesheetBuilder.setSchemaInspector(inspector);

		}

		return this.stylesheetBuilder.createTemplate();

	}

	/**

	 * creates a stylesheet from transformation rules;

	 * <p>don't call this method multiple times, unless transformation configuration changes, then re-init and configure transformation</p>

	 *

	 * @return the stylesheet

	 */

	private Reader createStylesheet() {

		try {

			Document rulesDoc = DocumentHelper.parseText(getTransformationRules());

			for (String key : this.ruleLanguageParser.getNamespaceDeclarations().keySet()) {

				xslDoc.getRootElement().addNamespace(key, this.ruleLanguageParser.getNamespaceDeclarations().get(key));

			}

			@SuppressWarnings("unchecked")

			List<Node> nodes = rulesDoc.getRootElement().selectNodes("//xsl:template");

			@SuppressWarnings("unchecked")

			List<Node> varNodes = rulesDoc.getRootElement().selectNodes("/templateroot/xsl:param");

			for (Node node : varNodes) {

				xslDoc.getRootElement().add(((Element) node).detach());

			}

			//			xslDoc.getRootElement().add(rulesDoc.getRootElement().selectSingleNode("//xsl:param[@name='var1']").detach());

			for (Node node : nodes) {

				xslDoc.getRootElement().add(((Element) node).detach()); //  (rulesDoc.getRootElement().aget);

			}

		} catch (DocumentException e) {

			log.error("error in creating stylesheet: " + e);

			throw new IllegalStateException(e);

		}

		String xsl = xslDoc.asXML();

		log.debug(xsl);

		return new StringReader(xsl);

	}

	/**

	 * @return the schema

	 */

	public Resource getSchema() {

		return schema;

	}

	/**

	 * @param schema the schema to set

	 */

	public void setSchema(Resource schema) {

		this.schema = schema;

	}

	@Override

	public Map<String, String> getStaticTransformationResults() {

		return this.staticResults;

	}

	@Override

	public Map<String, String> getJobProperties() {

		// TODO Auto-generated method stub

		return this.jobConstantMap;

	}

	@Override

	public Properties getLogInformation() {

		// TODO Auto-generated method stub

		return null;

	}

}