edu.stanford.nlp.sentiment

Class CollapseUnaryTransformer

java.lang.Object

edu.stanford.nlp.sentiment.CollapseUnaryTransformer

All Implemented Interfaces:

TreeTransformer, java.util.function.Function<Tree,Tree>

public class CollapseUnaryTransformer
extends java.lang.Object
implements TreeTransformer

This transformer collapses chains of unary nodes so that the top node is the only node left. The Sentiment model does not handle unary nodes, so this simplifies them to make a binary tree consist entirely of binary nodes and preterminals. A new tree with new nodes and labels is returned; the original tree is unchanged.

Author:

John Bauer

Constructor Summary

Constructors

Constructor and Description
CollapseUnaryTransformer()

Method Summary

Modifier and Type	Method and Description
Tree	transformTree(Tree tree) Does whatever one needs to do to a particular tree.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface edu.stanford.nlp.trees.TreeTransformer

apply

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

CollapseUnaryTransformer

public CollapseUnaryTransformer()

Method Detail

transformTree

public Tree transformTree(Tree tree)

Description copied from interface: TreeTransformer

Does whatever one needs to do to a particular tree. This routine is passed a whole Tree, and could itself work recursively, but the canonical usage is to invoke this method via the Tree.transform() method, which will apply the transformer in a bottom-up manner to each local Tree, and hence the implementation of TreeTransformer should merely examine and change a local (one-level) Tree.

Specified by:

transformTree in interface TreeTransformer

Parameters:

tree - A tree. Classes implementing this interface can assume that the tree passed in is not null.

Returns:

The transformed Tree