Examples of edu.stanford.nlp.ling.Label

edu.stanford.nlp.ling.Label
Something that implements the Label interface can act as a constituent, node, or word label with linguistic attributes. A Label is required to have a "primary" String value() (although this may be null). This is referred to as its value.
Implementations of Label split into two groups with respect to equality. Classes that extend ValueLabel define equality solely in terms of String equality of its value (secondary facets may be present but are ignored for purposes of equality), and have equals and compareTo defined across all subclasses of ValueLabel. This behavior should not be changed. Other classes that implement Label define equality only with their own type and require all fields of the type to be equal.
A subclass that extends another Label class should override the definition of labelFactory(), since the contract for this method is that it should return a factory for labels of the exact same object type. @author Christopher Manning

   * value.
   *
   * @param hf The headfinding algorithm to use
   */
  public void percolateHeads(HeadFinder hf) {
    Label nodeLabel = label();
    if (isLeaf()) {
      // Sanity check: word() is usually set by the TreeReader.
      if (nodeLabel instanceof HasWord) {
        HasWord w = (HasWord) nodeLabel;
        if (w.word() == null) {
          w.setWord(nodeLabel.value());
        }
      }


    } else {
      for (Tree kid : children()) {
        kid.percolateHeads(hf);
      }


      final Tree head = hf.determineHead(this);
      if (head != null) {
        final Label headLabel = head.label();


        // Set the head tag.
        String headTag = (headLabel instanceof HasTag) ? ((HasTag) headLabel).tag() : null;
        if (headTag == null && head.isLeaf()) {
          // below us is a leaf
          headTag = nodeLabel.value();
        }


        // Set the head word
        String headWord = (headLabel instanceof HasWord) ? ((HasWord) headLabel).word() : null;
        if (headWord == null && head.isLeaf()) {
          // below us is a leaf
          // this might be useful despite case for leaf above in
          // case the leaf label type doesn't support word()
          headWord = headLabel.value();
        }


        // Set the head index
        int headIndex = (headLabel instanceof HasIndex) ? ((HasIndex) headLabel).index() : -1;

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  private static Label makeDependencyLabel(Label oldLabel, boolean copyLabel, boolean copyIndex, boolean copyPosTag) {
    if ( ! copyLabel)
      return oldLabel;


    String wordForm = (oldLabel instanceof HasWord) ? ((HasWord) oldLabel).word() : oldLabel.value();
    Label newLabel = oldLabel.labelFactory().newLabel(wordForm);
    if (newLabel instanceof HasWord) ((HasWord) newLabel).setWord(wordForm);
    if (copyPosTag && newLabel instanceof HasTag && oldLabel instanceof HasTag) {
      String tag = ((HasTag) oldLabel).tag();
      ((HasTag) newLabel).setTag(tag);
    }

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      // Skip leaves and unary re-writes
      if (node.isLeaf() || node.children().length < 2) {
        continue;
      }
      // Create the head label (percolateHeads has already been executed)
      Label headLabel = makeDependencyLabel(node.label(), copyLabel, isConcrete, copyPosTag);
      String headWord = ((HasWord) headLabel).word();
      if (headWord == null) {
        headWord = headLabel.value();
      }
      int headIndex = (isConcrete && (headLabel instanceof HasIndex)) ? ((HasIndex) headLabel).index() : -1;


      // every child with a different (or repeated) head is an argument
      boolean seenHead = false;
      for (Tree child : node.children()) {
        Label depLabel = makeDependencyLabel(child.label(), copyLabel, isConcrete, copyPosTag);
        String depWord = ((HasWord) depLabel).word();
        if (depWord == null) {
          depWord = depLabel.value();
        }
        int depIndex = (isConcrete && (depLabel instanceof HasIndex)) ? ((HasIndex) depLabel).index() : -1;


        if (!seenHead && headIndex == depIndex && headWord.equals(depWord)) {
          seenHead = true;

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   *           and value(), the last two of which are identical).
   */
  public Set<Dependency<Label, Label, Object>> mapDependencies(Predicate<Dependency<Label, Label, Object>> f, HeadFinder hf, String rootName) {
    Set<Dependency<Label, Label, Object>> deps = mapDependencies(f, hf);
    if(rootName != null) {
      Label hl = headTerminal(hf).label();
      CoreLabel rl = new CoreLabel();
      rl.set(CoreAnnotations.TextAnnotation.class, rootName);
      rl.set(CoreAnnotations.IndexAnnotation.class, 0);
      deps.add(new NamedDependency(rl, hl, rootName));
    }

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  }


  @SuppressWarnings("unchecked")
  public <X extends HasWord> ArrayList<X> yieldHasWord(ArrayList<X> y) {
    if (isLeaf()) {
      Label lab = label();
      // cdm: this is new hacked in stuff in Mar 2007 so we can now have a
      // well-typed version of a Sentence, whose objects MUST implement HasWord
      //
      // wsg (Feb. 2010) - More hacks for trees with CoreLabels in which the type implements
      // HasWord but only the value field is populated. This can happen if legacy code uses

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   *         Labels of the original tree.
   */


  @SuppressWarnings({"unchecked"})
  public Tree deepCopy(TreeFactory tf, LabelFactory lf) {
    Label label = lf.newLabel(label());
    if (isLeaf()) {
      return tf.newLeaf(label);
    }
    Tree[] kids = children();
    // NB: The below list may not be of type Tree but TreeGraphNode, so we leave it untyped

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  // --- composition methods to implement Label interface


  @Override
  public String value() {
    Label lab = label();
    if (lab == null) {
      return null;
    }
    return lab.value();
  }

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  }




  @Override
  public void setValue(String value) {
    Label lab = label();
    if (lab != null) {
      lab.setValue(value);
    }
  }

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  }




  @Override
  public void setFromString(String labelStr) {
    Label lab = label();
    if (lab != null) {
      lab.setFromString(labelStr);
    }
  }

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   *
   * @return the LabelFactory for this kind of label
   */
  @Override
  public LabelFactory labelFactory() {
    Label lab = label();
    if (lab == null) {
      return null;
    }
    return lab.labelFactory();
  }

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