D-Net

package eu.dnetlib.msro.workflows.nodes.transform;

import java.io.IOException;

import java.util.Map;

import javax.annotation.Resource;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.annotation.Autowired;

import com.google.common.collect.Maps;

import eu.dnetlib.enabling.locators.UniqueServiceLocator;

import eu.dnetlib.enabling.resultset.factory.ResultSetFactory;

import eu.dnetlib.msro.workflows.graph.Arc;

import eu.dnetlib.msro.workflows.nodes.SimpleJobNode;

import eu.dnetlib.msro.workflows.procs.Env;

import eu.dnetlib.rmi.common.ResultSet;

import eu.dnetlib.rmi.enabling.ISLookUpService;

import eu.dnetlib.rmi.manager.MSROException;

import groovy.lang.GroovyShell;

import groovy.util.GroovyScriptEngine;

public class GroovyJobNode extends SimpleJobNode {

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

	/**

	 * used to transform the records using Groovy.

	 */

	@Autowired

	private ResultSetFactory resultSetFactory;

	private String inputEprParam;

	private String outputEprParam;

	private String transformationRuleId;

	private Map<String, String> groovyParams;

	@Resource

	private UniqueServiceLocator serviceLocator;

	private Map<String, String> retrieveGroovyParameter() {

		final Map<String, String> out = Maps.newHashMap();

		final String query = "for $x in collection('/db/DRIVER/GroovyProcessingDSResource/GroovyProcessingDSResourceType')"

				+ "where $x[.//RESOURCE_IDENTIFIER/@value='" + this.transformationRuleId + "']"

				+ "return concat($x//GROOVY_CLASSPATH/text(),':::',$x//GROOVY_DNETCLASS/text())";

		try {

			final String result = this.serviceLocator.getService(ISLookUpService.class).quickSearchProfile(query).get(0);

			if (result == null) { return null; }

			final String[] data = result.trim().split(":::");

			if (data.length == 2) {

				out.put("classpath", data[0]);

				out.put("mainClass", data[1]);

			}

			return out;

		} catch (final Exception e) {

			log.error(e);

			return null;

		}

	}

	@Override

	protected String execute(final Env env) throws Exception {

		final ResultSet<?> rsIn = env.getAttribute(this.inputEprParam, ResultSet.class);

		if (rsIn == null) { throw new MSROException("InputEprParam (" + this.inputEprParam + ") not found in ENV"); }

		String groovyClasspath, groovyDnetClass;

		final Map<String, String> prop = retrieveGroovyParameter();

		groovyClasspath = prop.get("classpath");

		groovyDnetClass = prop.get("mainClass");

		final ResultSet<?> rsOut = transformGroovy(rsIn, groovyClasspath, groovyDnetClass, this.groovyParams);

		env.setAttribute(this.outputEprParam, rsOut);

		return Arc.DEFAULT_ARC;

	}

	private ResultSet<?> transformGroovy(final ResultSet<?> source,

			final String groovyClasspath,

			final String groovyDnetClass,

			final Map<String, String> params) throws ClassNotFoundException, IOException {

		final GroovyScriptEngine gse = new GroovyScriptEngine(groovyClasspath);

		gse.getGroovyClassLoader().loadClass(groovyDnetClass);

		log.info("***********************************************");

		log.info("Loaded Groovy classes:");

		for (final Class<?> c : gse.getGroovyClassLoader().getLoadedClasses()) {

			log.info(c.getCanonicalName());

		}

		log.info("***********************************************");

		final GroovyShell groovyShell = new GroovyShell(gse.getGroovyClassLoader());

		final Object go = groovyShell.evaluate("new " + groovyDnetClass + "()");

		if (go instanceof GroovyUnaryFunction) {

			final GroovyUnaryFunction groovyUnaryFunction = (GroovyUnaryFunction) go;

			if (params != null) {

				groovyUnaryFunction.setParams(params);

			}

			return this.resultSetFactory.map(source, String.class, groovyUnaryFunction);

		} else {

			throw new RuntimeException("Groovy object " + go + " is not supported");

		}

	}

	public String getInputEprParam() {

		return this.inputEprParam;

	}

	public void setInputEprParam(final String inputEprParam) {

		this.inputEprParam = inputEprParam;

	}

	public String getOutputEprParam() {

		return this.outputEprParam;

	}

	public void setOutputEprParam(final String outputEprParam) {

		this.outputEprParam = outputEprParam;

	}

	public String getTransformationRuleId() {

		return this.transformationRuleId;

	}

	public void setTransformationRuleId(final String transformationRuleId) {

		this.transformationRuleId = transformationRuleId;

	}

	public Map<String, String> getGroovyParams() {

		return this.groovyParams;

	}

	public void setGroovyParams(final Map<String, String> groovyParams) {

		this.groovyParams = groovyParams;

	}

}