Examples of NLGElement

simplenlg.framework.NLGElement

NLGElement is the base class that all elements extend from. This is abstract and cannot therefore be instantiated itself. The additional element classes should be used to correctly identify the type of element required.

Realisation in SimpleNLG revolves around a tree structure. Each node in the tree is represented by a NLGElement, which in turn may have child nodes. The job of the processors is to replace various types of elements with other elements. The eventual goal, once all the processors have been run, is to produce a single string element representing the final realisation.

The features are stored in a Map of String (the feature name) and Object (the value of the feature).
@author D. Westwater, University of Aberdeen. @version 4.0

Examples of simplenlg.framework.NLGElement

   * @param phrase
   *            the element to be realised
   * @return the realised element.
   */
  private NLGElement realisePhraseElement(PhraseElement phrase) {
    NLGElement realisedElement = null;


    if (phrase != null) {
      ElementCategory category = phrase.getCategory();


      if (category instanceof PhraseCategory) {

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Examples of simplenlg.framework.NLGElement

   */
  public static boolean sameVPHead(NLGElement... sentences) {
    boolean equal = sentences.length >= 2;


    for (int i = 1; i < sentences.length && equal; i++) {
      NLGElement vp1 = sentences[i - 1]
          .getFeatureAsElement(InternalFeature.VERB_PHRASE);
      NLGElement vp2 = sentences[i]
          .getFeatureAsElement(InternalFeature.VERB_PHRASE);


      if (vp1 != null && vp2 != null) {
        NLGElement h1 = vp1.getFeatureAsElement(InternalFeature.HEAD);
        NLGElement h2 = vp2.getFeatureAsElement(InternalFeature.HEAD);
        equal = h1 != null && h2 != null ? h1.equals(h2) : false;


      } else {
        equal = false;
      }

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Examples of simplenlg.framework.NLGElement

   */
  public static boolean sameVPArgs(NLGElement... sentences) {
    boolean equal = sentences.length >= 2;


    for (int i = 1; i < sentences.length && equal; i++) {
      NLGElement vp1 = sentences[i - 1]
          .getFeatureAsElement(InternalFeature.VERB_PHRASE);
      NLGElement vp2 = sentences[i]
          .getFeatureAsElement(InternalFeature.VERB_PHRASE);


      equal = vp1
          .getFeatureAsElementList(InternalFeature.COMPLEMENTS)
          .equals(
              vp2
                  .getFeatureAsElementList(InternalFeature.COMPLEMENTS));
    }


    return equal;
  }

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Examples of simplenlg.framework.NLGElement

   */
  public static boolean sameVPModifiers(NLGElement... sentences) {
    boolean equal = sentences.length >= 2;


    for (int i = 1; i < sentences.length && equal; i++) {
      NLGElement vp1 = sentences[i - 1]
          .getFeatureAsElement(InternalFeature.VERB_PHRASE);
      NLGElement vp2 = sentences[i]
          .getFeatureAsElement(InternalFeature.VERB_PHRASE);


      equal = vp1
          .getFeatureAsElementList(InternalFeature.POSTMODIFIERS)
          .equals(
              vp2
                  .getFeatureAsElementList(InternalFeature.POSTMODIFIERS))
          && vp1
              .getFeatureAsElementList(
                  InternalFeature.PREMODIFIERS)
              .equals(
                  vp2
                      .getFeatureAsElementList(InternalFeature.PREMODIFIERS));
    }


    return equal;
  }

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Examples of simplenlg.framework.NLGElement

    PhraseSet comps = new PhraseSet(DiscourseFunction.OBJECT);
    // new PhraseSet(DiscourseFunction.INDIRECT_OBJECT);
    PhraseSet pmods = new PhraseSet(DiscourseFunction.POST_MODIFIER);    
    
    for (NLGElement s : sentences) {
      NLGElement vp = s.getFeatureAsElement(InternalFeature.VERB_PHRASE);


      if (vp != null) {
        if (vp.hasFeature(InternalFeature.COMPLEMENTS)) {
          comps
              .addPhrases(vp
                  .getFeatureAsElementList(InternalFeature.COMPLEMENTS));
        }


        if (vp.hasFeature(InternalFeature.POSTMODIFIERS)) {
          pmods
              .addPhrases(vp
                  .getFeatureAsElementList(InternalFeature.POSTMODIFIERS));
        }
      }
      
      if (s.hasFeature(InternalFeature.POSTMODIFIERS)) {

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Examples of simplenlg.framework.NLGElement

   * are clauses (that is, e1.getCategory() == e2.getCategory ==
   * {@link simplenlg.framework.PhraseCategory#CLAUSE}).
   */
  @Override
  public NLGElement apply(NLGElement previous, NLGElement next) {
    NLGElement aggregated = null;


    if (previous.getCategory() == PhraseCategory.CLAUSE
        && next.getCategory() == PhraseCategory.CLAUSE
        && PhraseChecker.nonePassive(previous, next)
        && !PhraseChecker.expletiveSubjects(previous, next)) {


      // case 1: identical sentences: remove the current
      if (PhraseChecker.sameSentences(previous, next)) {
        aggregated = previous;


        // case 2: subjects identical: coordinate VPs
      } else if (PhraseChecker.sameFrontMods(previous, next)
          && PhraseChecker.sameSubjects(previous, next)
          && PhraseChecker.samePostMods(previous, next)) {
        aggregated = this.factory.createClause();
        aggregated.setFeature(InternalFeature.SUBJECTS, previous
            .getFeatureAsElementList(InternalFeature.SUBJECTS));
        aggregated.setFeature(InternalFeature.FRONT_MODIFIERS, previous
            .getFeatureAsElement(InternalFeature.FRONT_MODIFIERS));
        aggregated.setFeature(Feature.CUE_PHRASE, previous
            .getFeatureAsElement(Feature.CUE_PHRASE));
        aggregated
            .setFeature(
                InternalFeature.POSTMODIFIERS,
                previous
                    .getFeatureAsElementList(InternalFeature.POSTMODIFIERS));
        NLGElement vp;


        // case 2.1: VPs have different arguments but same
        // head & mods
        if (!PhraseChecker.sameVPArgs(previous, next)
            && PhraseChecker.sameVPHead(previous, next)
            && PhraseChecker.sameVPModifiers(previous, next)) {


          NLGElement vp1 = previous
              .getFeatureAsElement(InternalFeature.VERB_PHRASE);
          vp = this.factory.createVerbPhrase();
          vp.setFeature(InternalFeature.HEAD, vp1
              .getFeatureAsElement(InternalFeature.HEAD));
          vp
              .setFeature(
                  InternalFeature.COMPLEMENTS,
                  vp1
                      .getFeatureAsElementList(InternalFeature.COMPLEMENTS));
          vp
              .setFeature(
                  InternalFeature.PREMODIFIERS,
                  vp1
                      .getFeatureAsElementList(InternalFeature.PREMODIFIERS));
          vp
              .setFeature(
                  InternalFeature.POSTMODIFIERS,
                  vp1
                      .getFeatureAsElementList(InternalFeature.POSTMODIFIERS));


          // case 2.2: just create a coordinate vP
        } else {
          NLGElement vp1 = previous
              .getFeatureAsElement(InternalFeature.VERB_PHRASE);
          NLGElement vp2 = next
              .getFeatureAsElement(InternalFeature.VERB_PHRASE);
          vp = this.factory.createCoordinatedPhrase(vp1, vp2);


          // case 2.3: expletive subjects
        }

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Examples of simplenlg.framework.NLGElement

   */
  private static void realiseComplements(SyntaxProcessor parent,
      PhraseElement phrase, ListElement realisedElement) {


    boolean firstProcessed = false;
    NLGElement currentElement = null;


    for (NLGElement complement : phrase
        .getFeatureAsElementList(InternalFeature.COMPLEMENTS)) {
      currentElement = parent.realise(complement);
      if (currentElement != null) {
        currentElement.setFeature(InternalFeature.DISCOURSE_FUNCTION,
            DiscourseFunction.COMPLEMENT);
        if (firstProcessed) {
          realisedElement.addComponent(new InflectedWordElement(
              "and", LexicalCategory.CONJUNCTION)); //$NON-NLS-1$
        } else {

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Examples of simplenlg.framework.NLGElement

   *            the current realisation of the noun phrase.
   */
  private static void realiseHead(SyntaxProcessor parent,
      PhraseElement phrase, ListElement realisedElement) {


    NLGElement head = phrase.getHead();
    if (head != null) {
      if (phrase.hasFeature(Feature.IS_COMPARATIVE)) {
        head.setFeature(Feature.IS_COMPARATIVE, phrase
            .getFeature(Feature.IS_COMPARATIVE));
      } else if (phrase.hasFeature(Feature.IS_SUPERLATIVE)) {
        head.setFeature(Feature.IS_SUPERLATIVE, phrase
            .getFeature(Feature.IS_SUPERLATIVE));
      }
      head = parent.realise(head);
      head.setFeature(InternalFeature.DISCOURSE_FUNCTION,
          DiscourseFunction.HEAD);
      realisedElement.addComponent(head);
    }
  }

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Examples of simplenlg.framework.NLGElement

    // than taking the elements of the list and putting them in the realised
    // element, we now add the realised elements to a new list and put that
    // in the realised element list. This preserves constituency for
    // orthography and morphology processing later.
    ListElement realisedList = new ListElement();
    NLGElement currentElement = null;
    for (NLGElement eachElement : elementList) {
      currentElement = parent.realise(eachElement);


      if (currentElement != null) {
        currentElement.setFeature(InternalFeature.DISCOURSE_FUNCTION,
            function);
        // realisedElement.addComponent(currentElement);
        realisedList.addComponent(currentElement);
      }
    }

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Examples of simplenlg.framework.NLGElement

    List<NLGElement> subjects = phrase
        .getFeatureAsElementList(InternalFeature.SUBJECTS);
    boolean expletive = false;


    if (subjects.size() == 1) {
      NLGElement subjectNP = subjects.get(0);


      if (subjectNP.isA(PhraseCategory.NOUN_PHRASE)) {
        expletive = subjectNP.getFeatureAsBoolean(
            LexicalFeature.EXPLETIVE_SUBJECT).booleanValue();
      } else if (subjectNP.isA(PhraseCategory.CANNED_TEXT)) {
        expletive = "there".equalsIgnoreCase(subjectNP.getRealisation()); //$NON-NLS-1$
      }
    }
    return expletive;
  }

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