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package eu.dnetlib.msro.workflows.nodes.unpack;
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import java.io.StringReader;
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import java.util.Iterator;
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import java.util.Queue;
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import java.util.concurrent.PriorityBlockingQueue;
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import javax.xml.ws.wsaddressing.W3CEndpointReference;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.dom4j.Document;
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import org.dom4j.Node;
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import org.dom4j.io.SAXReader;
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import org.springframework.beans.factory.annotation.Required;
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import com.googlecode.sarasvati.Arc;
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import com.googlecode.sarasvati.NodeToken;
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import eu.dnetlib.enabling.resultset.IterableResultSetFactory;
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import eu.dnetlib.enabling.resultset.client.ResultSetClientFactory;
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import eu.dnetlib.msro.workflows.nodes.SimpleJobNode;
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public class UnpackJobNode extends SimpleJobNode {
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/**
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* logger.
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*/
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private static final Log log = LogFactory.getLog(UnpackJobNode.class);
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private String inputEprParam;
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private String outputEprParam;
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private String xpath;
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private IterableResultSetFactory iterableResultSetFactory;
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private ResultSetClientFactory resultSetClientFactory;
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@Override
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protected String execute(final NodeToken token) throws Exception {
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final Iterator<String> client = resultSetClientFactory.getClient(token.getEnv().getAttribute(inputEprParam)).iterator();
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final Queue<String> queue = new PriorityBlockingQueue<String>();
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if (client.hasNext()) {
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populateQueue(queue, client.next(), xpath);
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}
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final W3CEndpointReference epr = iterableResultSetFactory.createIterableResultSet(new Iterable<String>() {
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@Override
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public Iterator<String> iterator() {
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return new Iterator<String>() {
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@Override
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public boolean hasNext() {
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synchronized (queue) {
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return !queue.isEmpty();
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}
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}
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@Override
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public String next() {
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synchronized (queue) {
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final String res = queue.poll();
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while (queue.isEmpty() && client.hasNext()) {
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populateQueue(queue, client.next(), xpath);
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}
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return res;
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}
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}
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@Override
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public void remove() {}
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};
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}
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});
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token.getEnv().setAttribute(outputEprParam, epr.toString());
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return Arc.DEFAULT_ARC;
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}
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private void populateQueue(final Queue<String> queue, final String record, final String xpath) {
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try {
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final SAXReader reader = new SAXReader();
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final Document doc = reader.read(new StringReader(record));
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for (Object o : doc.selectNodes(xpath)) {
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queue.add(((Node) o).asXML());
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}
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} catch (Exception e) {
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log.error("Error unpacking record: \n" + record, e);
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throw new RuntimeException(e);
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}
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}
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public IterableResultSetFactory getIterableResultSetFactory() {
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return iterableResultSetFactory;
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}
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@Required
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public void setIterableResultSetFactory(final IterableResultSetFactory iterableResultSetFactory) {
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this.iterableResultSetFactory = iterableResultSetFactory;
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}
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public ResultSetClientFactory getResultSetClientFactory() {
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return resultSetClientFactory;
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}
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@Required
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public void setResultSetClientFactory(final ResultSetClientFactory resultSetClientFactory) {
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this.resultSetClientFactory = resultSetClientFactory;
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}
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public String getInputEprParam() {
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return inputEprParam;
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}
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public void setInputEprParam(final String inputEprParam) {
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this.inputEprParam = inputEprParam;
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}
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public String getOutputEprParam() {
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return outputEprParam;
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}
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public void setOutputEprParam(final String outputEprParam) {
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this.outputEprParam = outputEprParam;
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}
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public String getXpath() {
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return xpath;
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}
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public void setXpath(final String xpath) {
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this.xpath = xpath;
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}
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}
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