Examples of simplenlg.framework.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

    // Everything else is postModifier
    if (modifier == null)
      return;


    // get modifier as NLGElement if possible
    NLGElement modifierElement = null;
    if (modifier instanceof NLGElement)
      modifierElement = (NLGElement) modifier;
    else if (modifier instanceof String) {
      String modifierString = (String) modifier;
      if (modifierString.length() > 0 && !modifierString.contains(" "))

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   * simplenlg.framework.PhraseElement#addPreModifier(simplenlg.framework.
   * NLGElement)
   */
  @Override
  public void addPreModifier(NLGElement newPreModifier) {
    NLGElement verbPhrase = (NLGElement) getFeatureAsElement(InternalFeature.VERB_PHRASE);


    if (verbPhrase != null) {


      if (verbPhrase instanceof PhraseElement) {
        ((PhraseElement) verbPhrase).addPreModifier(newPreModifier);

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  public void setFeature(String featureName, boolean featureValue) {
    super.setFeature(featureName, featureValue);
    if (vpFeatures.contains(featureName)) {
      //PhraseElement verbPhrase = (PhraseElement) getFeatureAsElement(InternalFeature.VERB_PHRASE);
      //AG: bug fix: VP could be coordinate phrase, so cast to NLGElement not PhraseElement
      NLGElement verbPhrase = (NLGElement) getFeatureAsElement(InternalFeature.VERB_PHRASE);
      if (verbPhrase != null || verbPhrase instanceof VPPhraseSpec)
        verbPhrase.setFeature(featureName, featureValue);
    }
  }

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   * 
   * @param verb
   */
  public void setVerb(Object verb) {
    // get verb phrase element (create if necessary)
    NLGElement verbPhraseElement = getVerbPhrase();


    // set head of VP to verb (if this is VPPhraseSpec, and not a coord)
    if (verbPhraseElement != null
        && verbPhraseElement instanceof VPPhraseSpec)
      ((VPPhraseSpec) verbPhraseElement).setVerb(verb);

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   * Sets the subject of a clause (assumes this is the only subject)
   * 
   * @param subject
   */
  public void setSubject(Object subject) {
    NLGElement subjectPhrase;
    if (subject instanceof PhraseElement
        || subject instanceof CoordinatedPhraseElement)
      subjectPhrase = (NLGElement) subject;
    else
      subjectPhrase = getFactory().createNounPhrase(subject);

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   * @param object
   */
  public void setObject(Object object) {


    // get verb phrase element (create if necessary)
    NLGElement verbPhraseElement = getVerbPhrase();


    // set object of VP to verb (if this is VPPhraseSpec, and not a coord)
    if (verbPhraseElement != null
        && verbPhraseElement instanceof VPPhraseSpec)
      ((VPPhraseSpec) verbPhraseElement).setObject(object);

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   * @param indirectObject
   */
  public void setIndirectObject(Object indirectObject) {


    // get verb phrase element (create if necessary)
    NLGElement verbPhraseElement = getVerbPhrase();


    // set head of VP to verb (if this is VPPhraseSpec, and not a coord)
    if (verbPhraseElement != null
        && verbPhraseElement instanceof VPPhraseSpec)
      ((VPPhraseSpec) verbPhraseElement)

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    if (modifier == null)
      return;


    // get modifier as NLGElement if possible
    NLGElement modifierElement = null;
    if (modifier instanceof NLGElement)
      modifierElement = (NLGElement) modifier;
    else if (modifier instanceof String) {
      String modifierString = (String) modifier;
      if (modifierString.length() > 0 && !modifierString.contains(" "))

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    // Do nothing
  }


  @Override
  public NLGElement realise(NLGElement element) {
    NLGElement realisedElement = null;


    if (element instanceof InflectedWordElement) {
      realisedElement = doMorphology((InflectedWordElement) element);


    } else if (element instanceof StringElement) {

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   *            the <code>InflectedWordElement</code>
   * @return an <code>NLGElement</code> reflecting the correct inflection for
   *         the word.
   */
  private NLGElement doMorphology(InflectedWordElement element) {
    NLGElement realisedElement = null;
    if (element.getFeatureAsBoolean(InternalFeature.NON_MORPH)
        .booleanValue()) {
      realisedElement = new StringElement(element.getBaseForm());
      realisedElement.setFeature(InternalFeature.DISCOURSE_FUNCTION,
          element.getFeature(InternalFeature.DISCOURSE_FUNCTION));
    } else {
      NLGElement baseWord = element
          .getFeatureAsElement(InternalFeature.BASE_WORD);


      if (baseWord == null && this.lexicon != null) {
        baseWord = this.lexicon.lookupWord(element.getBaseForm());
      }

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Related Classes of simplenlg.framework.NLGElement

simplenlg.aggregation.AggregationHelper

simplenlg.aggregation.AggregationRule

simplenlg.aggregation.Aggregator

simplenlg.aggregation.ClauseCoordinationRule

simplenlg.aggregation.FunctionalSet

simplenlg.aggregation.NewAggregator

simplenlg.aggregation.PhraseChecker

simplenlg.aggregation.PhraseSet

simplenlg.features.Tense

simplenlg.format.english.TextFormatter

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