org.molgenis.semanticmapper.service.impl.UnitResolverImpl Maven / Gradle / Ivy

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package org.molgenis.semanticmapper.service.impl;

import static java.util.Collections.singletonList;
import static java.util.Objects.requireNonNull;

import com.google.common.collect.Sets;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import javax.measure.quantity.Quantity;
import javax.measure.unit.Unit;
import org.apache.commons.lang3.StringUtils;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.molgenis.data.meta.model.Attribute;
import org.molgenis.ontology.core.model.Ontology;
import org.molgenis.ontology.core.model.OntologyTerm;
import org.molgenis.ontology.core.service.OntologyService;
import org.molgenis.semanticmapper.service.UnitResolver;
import org.molgenis.semanticmapper.utils.UnitHelper;
import org.molgenis.semanticsearch.string.NGramDistanceAlgorithm;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class UnitResolverImpl implements UnitResolver {
  private static final Logger LOG = LoggerFactory.getLogger(UnitResolverImpl.class);

  static final String UNIT_ONTOLOGY_IRI = "http://purl.obolibrary.org/obo/uo.owl";

  private final OntologyService ontologyService;

  public UnitResolverImpl(OntologyService ontologyService) {
    this.ontologyService = requireNonNull(ontologyService);
  }

  @Override
  public Unit resolveUnit(Attribute attr) {
    Set tokens = tokenize(attr.getLabel(), attr.getDescription());

    // Option 1: Check if a term matches a unit
    Unit unit = null;
    if (!tokens.isEmpty()) {
      for (String term : tokens) {
        try {
          unit = Unit.valueOf(term);
          break;
        } catch (IllegalArgumentException e) {
          // noop
        }
      }

      if (isUnitEmpty(unit)) {
        // Option 2: Search unit ontology for a match
        OntologyTerm unitOntologyTerm =
            resolveUnitOntologyTerm(
                tokens.stream()
                    .map(this::convertNumberToOntologyTermStyle)
                    .collect(Collectors.toSet()));

        if (unitOntologyTerm != null) {
          // try label + synonym labels until hit
          for (String synonymLabel : unitOntologyTerm.getSynonyms()) {
            try {
              unit = Unit.valueOf(synonymLabel);
              break;
            } catch (IllegalArgumentException e) {
              // noop
            }
          }
        }
      }
    }

    if (isUnitEmpty(unit)) {
      unit = null;
    }

    return unit;
  }

  private OntologyTerm resolveUnitOntologyTerm(Set tokens) {
    OntologyTerm unitOntologyTerm;
    Ontology unitOntology = ontologyService.getOntology(UNIT_ONTOLOGY_IRI);
    if (unitOntology != null) {
      if (!tokens.isEmpty()) {
        List ontologyIds = singletonList(unitOntology.getId());
        List ontologyTerms =
            ontologyService.findExactOntologyTerms(ontologyIds, tokens, Integer.MAX_VALUE);
        if (ontologyTerms != null && !ontologyTerms.isEmpty()) {
          unitOntologyTerm = ontologyTerms.get(0);
        } else {
          unitOntologyTerm = null;
        }
      } else {
        unitOntologyTerm = null;
      }
    } else {
      LOG.warn("Unit resolver is missing required unit ontology [{}]", UNIT_ONTOLOGY_IRI);
      unitOntologyTerm = null;
    }
    return unitOntologyTerm;
  }

  String convertNumberToOntologyTermStyle(String term) {
    term = UnitHelper.superscriptToNumber(term.replaceAll("\\^", StringUtils.EMPTY));
    Pattern pattern = Pattern.compile("\\w+(\\d+)");
    Matcher matcher = pattern.matcher(term);

    if (matcher.find()) {
      String group = matcher.group(1);
      String modifiedPart = group.trim();
      modifiedPart = "^[" + modifiedPart + "]";
      term = term.replaceAll(group, modifiedPart);
    }
    return QueryParser.escape(term);
  }

  Set tokenize(String... terms) {
    Set tokens = new HashSet<>();
    if (terms != null && terms.length > 0) {
      Sets.newHashSet(terms).stream()
          .filter(StringUtils::isNotBlank)
          .map(StringUtils::lowerCase)
          .map(this::replaceIllegalChars)
          .forEach(
              term ->
                  tokens.addAll(
                      Sets.newHashSet(term.split("\\s+")).stream()
                          .filter(this::notPureNumberExpression)
                          .map(UnitHelper::numberToSuperscript)
                          .collect(Collectors.toSet())));

      tokens.removeAll(NGramDistanceAlgorithm.STOPWORDSLIST);
    }
    return tokens;
  }

  boolean isUnitEmpty(Unit unit) {
    return unit == null || StringUtils.isBlank(unit.toString());
  }

  boolean notPureNumberExpression(String str) {
    return !str.matches("\\d+");
  }

  String replaceIllegalChars(String term) {
    return UnitHelper.superscriptToNumber(term).replaceAll("[^a-zA-Z0-9 /\\^]", " ");
  }
}