import edu.stanford.nlp.ling.CoreAnnotations.BeginIndexAnnotation; //导入依赖的package包/类
private void addTreebankNodeToIndexes(
    TreebankNode node,
    JCas jCas,
    Tree tree,
    List<CoreLabel> tokenAnns) {
  // figure out begin and end character offsets
  CoreMap label = (CoreMap) tree.label();
  CoreMap beginToken = tokenAnns.get(label.get(BeginIndexAnnotation.class));
  CoreMap endToken = tokenAnns.get(label.get(EndIndexAnnotation.class) - 1);
  int nodeBegin = beginToken.get(CharacterOffsetBeginAnnotation.class);
  int nodeEnd = endToken.get(CharacterOffsetEndAnnotation.class);

  // set span, node type, children (mutual recursion), and add it to the JCas
  node.setBegin(nodeBegin);
  node.setEnd(nodeEnd);
  node.setNodeType(tree.value());
  node.setChildren(this.addTreebankNodeChildrenToIndexes(node, jCas, tokenAnns, tree));
  node.setLeaf(node.getChildren().size() == 0);
  node.addToIndexes();
}
 

import edu.stanford.nlp.ling.CoreAnnotations.BeginIndexAnnotation; //导入依赖的package包/类
/**
 * Assigns span indices (BeginIndexAnnotation and EndIndexAnnotation) to all nodes in a tree.
 * The beginning index is equivalent to the IndexAnnotation of the first leaf in the constituent.
 * The end index is equivalent to the first integer after the IndexAnnotation of the last leaf in the constituent. 
 * @param startIndex Begin indexing at this value
 */
public Pair<Integer, Integer> indexSpans(MutableInteger startIndex) {
  int start = Integer.MAX_VALUE;
  int end = Integer.MIN_VALUE;
      
  if(isLeaf()){
    start = startIndex.intValue();
    end = startIndex.intValue() + 1;
    startIndex.incValue(1);
  } else {
    for (Tree kid : children()) {
      Pair<Integer, Integer>  span = kid.indexSpans(startIndex);
      if(span.first < start) start = span.first;
      if(span.second > end) end = span.second;
    }
  }
  
  CoreMap afl = (CoreMap) label();
  afl.set(BeginIndexAnnotation.class, start);
  afl.set(EndIndexAnnotation.class, end);
  return new Pair<Integer, Integer>(start, end);
}
 

import edu.stanford.nlp.ling.CoreAnnotations.BeginIndexAnnotation; //导入依赖的package包/类
/**
 * Assigns span indices (BeginIndexAnnotation and EndIndexAnnotation) to all nodes in a tree.
 * The beginning index is equivalent to the IndexAnnotation of the first leaf in the constituent.
 * The end index is equivalent to the first integer after the IndexAnnotation of the last leaf in the constituent.
 * @param startIndex Begin indexing at this value
 */
public Pair<Integer, Integer> indexSpans(MutableInteger startIndex) {
  int start = Integer.MAX_VALUE;
  int end = Integer.MIN_VALUE;

  if(isLeaf()){
    start = startIndex.intValue();
    end = startIndex.intValue() + 1;
    startIndex.incValue(1);
  } else {
    for (Tree kid : children()) {
      Pair<Integer, Integer>  span = kid.indexSpans(startIndex);
      if(span.first < start) start = span.first;
      if(span.second > end) end = span.second;
    }
  }

  CoreLabel afl = (CoreLabel) label();
  afl.set(BeginIndexAnnotation.class, start);
  afl.set(EndIndexAnnotation.class, end);
  return new Pair<Integer, Integer>(start, end);
}