示例#1
0
  public class MyIterator implements Iterator<Tree<String>> {

    private Iterator<File> fileIt;
    private Iterator<Tree<String>> treeIt = Iterators.emptyIterator();

    public MyIterator(Iterator<File> fileIt) {
      this.fileIt = fileIt;
    }

    private Iterator<Tree<String>> getTreeIterator() {
      String nextPath = fileIt.next().getAbsolutePath();
      Iterator<Tree<String>> treeIt = new Trees.PennTreeReader(IOUtils.openInHard(nextPath));
      Method<Tree<String>, Tree<String>> transformMethod =
          new Method<Tree<String>, Tree<String>>() {
            public Tree<String> call(Tree<String> obj) {
              return treeTransformer.transformTree(obj);
            }
          };
      Filter<Tree<String>> treeFilter =
          new Filter<Tree<String>>() {
            public boolean accept(Tree<String> t) {
              int length = t.getYield().size();
              return (length >= minLength && length <= maxLength);
            }
          };
      treeIt =
          new Iterators.TransformingIterator<Tree<String>, Tree<String>>(treeIt, transformMethod);
      treeIt = new Iterators.FilteredIterator<Tree<String>>(treeFilter, treeIt);
      return treeIt;
    }

    private boolean queueNext() {
      if (treeIt.hasNext()) {
        return true;
      }
      if (!fileIt.hasNext()) {
        return false;
      }
      treeIt = getTreeIterator();
      return queueNext();
    }

    public boolean hasNext() {
      return queueNext();
    }

    public Tree<String> next() {
      queueNext();
      return treeTransformer.transformTree(treeIt.next());
    }

    public void remove() {
      throw new UnsupportedOperationException();
    }
  }
示例#2
0
 public Iterator<Tree<String>> iterator() {
   List<File> files = IOUtils.getFilesUnder(dataRoot, IOUtil.getFileFilter(prefix, extension));
   initializeTreeTransformer();
   Iterator<Tree<String>> treeIt = new MyIterator(files.iterator());
   return Iterators.maxLengthIterator(treeIt, maxNumTrees);
 }