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package eu.dnetlib.dli.parser;
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import java.io.ByteArrayInputStream;
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import java.util.List;
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import java.util.Stack;
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import javax.xml.stream.XMLInputFactory;
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import javax.xml.stream.XMLStreamConstants;
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import javax.xml.stream.XMLStreamReader;
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import com.google.common.collect.Lists;
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import eu.dnetlib.resolver.model.*;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* This method outperforms SimpleRecordParser by a vast amount, especially since we are just getting stuff in the header.
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*
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* @author sandro
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*/
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public class DLIRecordParser {
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private static final Log log = LogFactory.getLog(DLIRecordParser.class);
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public ResolvedObject parseRecord(final String record) {
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try {
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XMLInputFactory factory = XMLInputFactory.newInstance();
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XMLStreamReader parser = factory.createXMLStreamReader(new ByteArrayInputStream(record.getBytes()));
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ResolvedObject object = new ResolvedObject();
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Stack<String> elementStack = new Stack<>();
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elementStack.push("/");
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List<String> titles = Lists.newArrayList();
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List<String> authors = Lists.newArrayList();
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List<String> relatedAuthors = null;
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boolean insideRelation = false;
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ObjectRelation currentRelation = null;
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ResolvedObject currentExtraInfo = null;
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List<ObjectRelation> relations = Lists.newArrayList();
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List<ObjectProvenance> datasources = Lists.newArrayList();
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while (parser.hasNext()) {
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int event = parser.next();
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if (event == XMLStreamConstants.END_ELEMENT) {
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final String localName = parser.getLocalName();
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// CLOSE TAG relation
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if (localName.equals("relatedauthors")) {
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if (currentExtraInfo != null && relatedAuthors != null) {
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currentExtraInfo.setAuthors(relatedAuthors);
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relatedAuthors.clear();
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relatedAuthors = null;
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}
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}
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if (localName.equals("relation")) {
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log.debug("found closed tag relation");
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insideRelation = false;
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if (currentRelation != null) {
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if (currentExtraInfo != null) {
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currentExtraInfo.setPid(currentRelation.getTargetPID().getId());
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currentExtraInfo.setPidType(currentRelation.getTargetPID().getType());
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currentExtraInfo.setDatasourceProvenance(object.getDatasourceProvenance());
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currentRelation.setExtraInfo(currentExtraInfo);
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}
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if (object.getPid() == null || object.getPid().isEmpty()) {
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log.error("ERROR the DOI is empty");
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}
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currentRelation.setSourcePid(object.getPid());
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if (!StringUtils.isBlank(object.getPid()) && !StringUtils.isBlank(object.getPidType())) {
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currentRelation.setSourceRecordId(object.getIdentifier());
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}
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log.debug("Adding new relation to the object");
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relations.add(currentRelation);
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currentRelation = null;
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}
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}
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elementStack.pop();
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} else if (event == XMLStreamConstants.START_ELEMENT) {
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final String localName = parser.getLocalName();
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elementStack.push(localName);
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// LOCAL IDENTIFIER TAG
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if ("localIdentifier".equals(localName)) {
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log.debug("found open tag localIdentifier");
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String type = "";
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for (int i = 0; i < parser.getAttributeCount(); i++) {
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if (parser.getAttributeLocalName(i).equals("type")) {
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type = parser.getAttributeValue(i);
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break;
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}
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}
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parser.next();
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if (parser.hasText()) {
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object.setPid(parser.getText().trim());
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object.setPidType(type);
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}
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// TITLE TAG
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} else if ("title".equals(localName)) {
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log.debug("found open tag title");
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parser.next();
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if (parser.hasText()) {
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titles.add(parser.getText().trim());
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}
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// DATASOURCE PROVENANCE TAG
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} else if ("datasource".equals(localName)) {
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String completionStatus = "";
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String provisionMode = "";
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log.debug("found open tag datasources");
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for (int i = 0; i < parser.getAttributeCount(); i++) {
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if (parser.getAttributeLocalName(i).equals("completionStatus")) {
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completionStatus = parser.getAttributeValue(i);
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} else if (parser.getAttributeLocalName(i).equals("provisionMode")) {
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provisionMode = parser.getAttributeValue(i);
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}
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}
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parser.next();
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if (parser.hasText()) {
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String dt = parser.getText().trim();
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ObjectProvenance pr = new ObjectProvenance(dt, ObjectProvisionMode.fromString(provisionMode).toString(),
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CompletionStatus.fromString(completionStatus).toString(), null, null, true);
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datasources.add(pr);
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}
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// INSIDE the tag Person
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} else if ("completionStatus".equals(localName)) {
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log.debug("found open tag completionStatus");
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parser.next();
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if (parser.hasText()) {
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object.setCompletionStatus(CompletionStatus.fromString(parser.getText().trim()).toString());
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}
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} else if ("fullname".equals(localName)) {
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log.debug("found open tag fullname");
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parser.next();
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if (parser.hasText()) {
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authors.add(parser.getText().trim());
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}
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// INSIDE THE TAG RELATION
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} else if ("relation".equals(localName)) {
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log.debug("found open tag relation");
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insideRelation = true;
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currentRelation = new ObjectRelation();
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currentExtraInfo = new ResolvedObject();
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} else if ("pid".equals(localName) && insideRelation) {
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PID currentPid = new PID();
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for (int i = 0; i < parser.getAttributeCount(); i++) {
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if (parser.getAttributeLocalName(i).equals("type")) {
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currentPid.setType(parser.getAttributeValue(i));
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break;
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}
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}
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try {
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parser.next();
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if (parser.hasText()) {
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currentPid.setId(parser.getText().trim());
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currentRelation.setTargetPID(currentPid);
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}
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} catch (Exception e) {
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log.error("skipped doi");
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}
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// INSIDE THE TAG TYPEOFRELATION
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} else if ("typeOfRelation".equals(localName) && insideRelation) {
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log.debug("found open tag typeOfRelation");
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parser.next();
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if (parser.hasText()) {
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currentRelation.setRelationSemantics(parser.getText().trim());
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}
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// INSIDE THE TAG OBJECT TYPE
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} else if ("relatedtype".equals(localName) && insideRelation) {
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log.debug("found open tag relatedtype");
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parser.next();
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if (parser.hasText()) {
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currentExtraInfo.setType(ObjectType.valueOf(parser.getText().trim()));
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}
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} else if ("relatedtitle".equals(localName) && insideRelation) {
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log.debug("found open tag relatedtype");
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parser.next();
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if (parser.hasText()) {
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currentExtraInfo.setTitles(Lists.newArrayList(parser.getText().trim()));
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}
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} else if ("relatedauthor".equals(localName) && insideRelation) {
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log.debug("found open tag relatedtype");
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parser.next();
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if (parser.hasText()) {
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if (relatedAuthors == null)
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relatedAuthors = Lists.newArrayList();
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relatedAuthors.add(parser.getText().trim());
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}
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} else if ("objectType".equals(localName)) {
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log.debug("found open tag objectType");
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parser.next();
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if (parser.hasText()) {
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object.setType(ObjectType.valueOf(parser.getText().trim()));
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}
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// INSIDE THE TAG DATE
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} else if ("date".equals(localName)) {
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log.debug("found open tag date");
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parser.next();
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if (parser.hasText()) {
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object.setDate(parser.getText().trim());
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}
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}
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}
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}
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object.setAuthors(authors);
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object.setTitles(titles);
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object.setDatasourceProvenance(datasources);
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object.setRelations(relations);
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return object;
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} catch (Exception e) {
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log.error("Error on parsing record" + record, e);
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return null;
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}
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}
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}
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