johncurcio / ETL4LODPlus

import java.io.File;

import java.nio.file.Paths;

import java.util.Collection;

import java.util.Iterator;

import org.apache.jena.riot.Lang;

import org.apache.jena.riot.RDFLanguages;

import org.pentaho.di.core.exception.KettleException;

import org.pentaho.di.core.exception.KettleStepException;

import org.pentaho.di.core.row.RowDataUtil;

import org.pentaho.di.core.row.RowMeta;

import org.pentaho.di.core.row.RowMetaInterface;

import org.pentaho.di.trans.Trans;

import org.pentaho.di.trans.TransMeta;

import org.pentaho.di.trans.step.BaseStep;

import org.pentaho.di.trans.step.StepDataInterface;

import org.pentaho.di.trans.step.StepInterface;

import org.pentaho.di.trans.step.StepMeta;

import org.pentaho.di.trans.step.StepMetaInterface;

import org.apache.jena.ontology.OntClass;

import org.apache.jena.ontology.OntModel;

import org.apache.jena.ontology.OntModelSpec;

import org.apache.jena.ontology.OntProperty;

import org.apache.jena.rdf.model.ModelFactory;

import br.ufrj.ppgi.greco.kettle.plugin.tools.datatable.DataTable;

public class OwlInputStep extends BaseStep implements StepInterface {

	boolean repetir = true;

	public OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);

	public boolean init(StepMetaInterface smi, StepDataInterface sdi) {

		return super.init(smi, sdi);

	}

	public boolean processRow(StepMetaInterface smi, StepDataInterface sdi) throws KettleException {

		OwlInputStepMeta meta = (OwlInputStepMeta) smi;

		OwlInputStepData data = (OwlInputStepData) sdi;

		Object[] row = getRow();

		if (first) {

			first = false;

			RowMetaInterface rowMeta = getInputRowMeta(row != null);

			data.outputRowMeta = rowMeta.clone();

			meta.getFields(data.outputRowMeta, getStepname(), null, null, this);

		}

		DataTable<String> table = meta.getVocabTable();

		boolean isTableEmpty = table.getValue(0, OwlInputStepMeta.Field.VOCAB_TABLE_URI.name()).isEmpty();

		if (!isTableEmpty){

			for (int k = 0; k < table.size(); k++) {

				putOutRow(row, meta, data, 

						table.getValue(k, OwlInputStepMeta.Field.VOCAB_TABLE_PREFIX.name()),

						table.getValue(k, OwlInputStepMeta.Field.VOCAB_TABLE_URI.name()),

						table.getValue(k, OwlInputStepMeta.Field.VOCAB_TABLE_PROPERTY.name()),

						table.getValue(k, OwlInputStepMeta.Field.VOCAB_TABLE_TYPE.name()));

			}

		} else {

			table = meta.getMapTable();

			for (int k = 0; k < table.size(); k++) {

				String owlFile = getOwlFile(table.getValue(k, OwlInputStepMeta.Field.MAP_TABLE_ONTOLOGY_URI.name()));

				try {

					model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);

					this.logBasic("Attempting to read " + owlFile + " as RDF/XML");

					model.read(owlFile);

					this.logBasic(owlFile + " has been read successfully");

				} catch (Exception eox) {

					this.logBasic("Error reading " + owlFile + " as RDF/XML: " + eox.getMessage());

					Collection<Lang> registeredLanguages = RDFLanguages.getRegisteredLanguages();

					for (Lang c : registeredLanguages) {

						try {

							this.logBasic("Trying to read the file as... " + c.getName());

							model.read(owlFile, c.getName());

							this.logBasic(owlFile + " has been read successfully");

							break;

						} catch (Exception e) {

							this.logBasic("File could not be read as " + c.getName() + ": " + e.getMessage());

						}

					}

				}

				if (!model.isEmpty()) {

					String ontoField = table.getValue(k, OwlInputStepMeta.Field.MAP_TABLE_ONTOLOGY_NAME.name());

					for (Iterator<OntClass> i = model.listClasses(); i.hasNext();) {

						OntClass cls = i.next();

						if (cls.getLocalName() != null) {

							putOutRow(row, meta, data, 

									ontoField.trim(), cls.getURI(), "rdf:type", "rdfs:class");

						}

					} 

					for (Iterator<OntProperty> j = model.listAllOntProperties(); j.hasNext();) {

						OntProperty proper = j.next();

						if (proper.getLocalName() != null) {

							putOutRow(row, meta, data, 

									ontoField.trim(), proper.getURI(), "rdf:type", "rdfs:property");

						}

					}

				}

			}

		}

		if (row == null){

			setOutputDone();

			return false;

		}

		return true;

	}

	/**

	 * Verifies whether src is an actual file or and URI.

	 * If the String src is a file, return it's valid path

	 * else return the URI

	 * 

	 * @param src the original file path

	 * @return a valid file path or an URI

	 */

	private String getOwlFile(String src) {

		File file = new File(src);

		if (!file.isDirectory()){

		   file = file.getParentFile();

		}

		if (file.exists()){

			return Paths.get(src).toUri().toString();

		}else {

			return src;

		}

	}

	public void dispose(StepMetaInterface smi, StepDataInterface sdi) {

		super.dispose(smi, sdi);

	}

	private void putOutRow(Object[] inputRow, OwlInputStepMeta meta, OwlInputStepData data, String... var) throws KettleStepException {

		int outputRowPos = 0;

		Object[] outputRow = null;

		if (meta.isKeepInputFields()) {

			outputRow = inputRow;

			outputRowPos = getInputRowMeta().size();

		} else {

			outputRow = new Object[4];

		}

		if (outputRow != null){

			for (String arg : var) {

				outputRow = RowDataUtil.addValueData(outputRow, outputRowPos++, arg);

			}

			putRow(data.outputRowMeta, outputRow);

		}

	}

	private RowMetaInterface getInputRowMeta(boolean hasInputRow) {

		RowMetaInterface rowMeta = null;

		if (hasInputRow)

			rowMeta = getInputRowMeta();

		else

			rowMeta = new RowMeta();

		return rowMeta;

	}

}