edu.stanford.nlp.trees.international.pennchinese
Class ChineseCollinizer

java.lang.Object
  edu.stanford.nlp.trees.international.pennchinese.ChineseCollinizer

All Implemented Interfaces:

TreeTransformer

public class ChineseCollinizer
extends Object
implements TreeTransformer

Performs collinization operations on Chinese trees similar to those for English Namely:

• strips all functional & automatically-added tags
• strips all punctuation
• merges PRN and ADVP
• eliminates ROOT (note that there are a few non-unary ROOT nodes; these are not eliminated)

Author:

Roger Levy

Field Summary

protected TreeFactory

tf

Constructor Summary

ChineseCollinizer(ChineseTreebankLanguagePack ctlp)

ChineseCollinizer(ChineseTreebankLanguagePack ctlp, boolean deletePunct)

Method Summary

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

Field Detail

tf

protected TreeFactory tf

Constructor Detail

ChineseCollinizer

public ChineseCollinizer(ChineseTreebankLanguagePack ctlp)

ChineseCollinizer

public ChineseCollinizer(ChineseTreebankLanguagePack ctlp,
                         boolean deletePunct)

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