edu.stanford.nlp.trees

Class OrderedCombinationTreeNormalizer

java.lang.Object

edu.stanford.nlp.trees.TreeNormalizer

edu.stanford.nlp.trees.OrderedCombinationTreeNormalizer

All Implemented Interfaces:

Serializable

public class OrderedCombinationTreeNormalizer
extends TreeNormalizer

This class combines multiple tree normalizers. Given a list of tree normalizer, it applies each tree normalizer from the first to the last for each of the normalize nonterminal, normalize terminal, and normalize whole tree methods.

Author:

Anna Rafferty

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
OrderedCombinationTreeNormalizer()
OrderedCombinationTreeNormalizer(List<TreeNormalizer> tns)

Method Summary

Modifier and Type	Method and Description
void	addTreeNormalizer(TreeNormalizer tn) Adds the given tree normalizer to this combination; the tree normalizers are applied in the order they were added, with the first to be added being the first to be applied.
String	normalizeNonterminal(String category) Normalizes a nonterminal contents (and maybe intern it).
String	normalizeTerminal(String leaf) Normalizes a leaf contents (and maybe intern it).
Tree	normalizeWholeTree(Tree tree, TreeFactory tf) Normalize a whole tree -- this method assumes that the argument that it is passed is the root of a complete Tree.

Methods inherited from class java.lang.Object

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

Constructor Detail

OrderedCombinationTreeNormalizer

public OrderedCombinationTreeNormalizer()

OrderedCombinationTreeNormalizer

public OrderedCombinationTreeNormalizer(List<TreeNormalizer> tns)

Method Detail

addTreeNormalizer

public void addTreeNormalizer(TreeNormalizer tn)

Adds the given tree normalizer to this combination; the tree normalizers are applied in the order they were added, with the first to be added being the first to be applied.

normalizeNonterminal

public String normalizeNonterminal(String category)

Description copied from class: TreeNormalizer

Normalizes a nonterminal contents (and maybe intern it).

Overrides:

normalizeNonterminal in class TreeNormalizer

Parameters:

category - The String that decorates this nonterminal node

Returns:

The normalized form of this nonterminal String

normalizeTerminal

public String normalizeTerminal(String leaf)

Description copied from class: TreeNormalizer

Normalizes a leaf contents (and maybe intern it).

Overrides:

normalizeTerminal in class TreeNormalizer

Parameters:

leaf - The String that decorates the leaf

Returns:

The normalized form of this leaf String

normalizeWholeTree

public Tree normalizeWholeTree(Tree tree,
                               TreeFactory tf)

Description copied from class: TreeNormalizer

Normalize a whole tree -- this method assumes that the argument that it is passed is the root of a complete Tree. It is normally implemented as a Tree-walking routine.

This method may return null. This is interpreted to mean that this is a tree that should not be included in further processing. PennTreeReader recognizes this return value, and asks for another Tree from the input Reader.

Overrides:

normalizeWholeTree in class TreeNormalizer

Parameters:

tree - The tree to be normalized

tf - the TreeFactory to create new nodes (if needed)

Returns:

Tree the normalized tree