edu.stanford.nlp.trees
Interface TreeFactory

All Known Implementing Classes:

LabeledScoredTreeFactory, SimpleTreeFactory, TreeGraphNodeFactory

public interface TreeFactory

A TreeFactory acts as a factory for creating objects of class Tree, or some descendent class. Methods implementing this interface may assume that the List of children passed to them is a list that actually contains trees, but this can't be enforced in Java without polymorphic types. The methods with a String argument do not guarantee that the tree label() will be a String -- the TreeFactory may convert it into some other type.

Author:

Christopher Manning

Method Summary

Tree	newLeaf(Label label) Create a new tree leaf node, with the given label.
Tree	newLeaf(String word) Create a new tree leaf node, where the label is formed from the String passed in.
Tree	newTreeNode(Label label, List children) Create a new tree nonleaf node, with the given label.
Tree	newTreeNode(String parent, List children) Create a new tree nonleaf node, where the label is formed from the String passed in.

Method Detail

newLeaf

Tree newLeaf(String word)

Create a new tree leaf node, where the label is formed from the String passed in.

Parameters:

word - The word that will go into the tree label.

Returns:

The new leaf

newTreeNode

Tree newTreeNode(String parent,
                 List children)

Create a new tree nonleaf node, where the label is formed from the String passed in.

Parameters:

parent - The string that will go into the parent tree label.

children - The list of daughters of this tree. The children may be a (possibly empty) List of children or null

Returns:

The new interior tree node

newLeaf

Tree newLeaf(Label label)

Create a new tree leaf node, with the given label.

Parameters:

label - The label for the leaf node

Returns:

The new leaf

newTreeNode

Tree newTreeNode(Label label,
                 List children)

Create a new tree nonleaf node, with the given label.

Parameters:

label - The label for the parent tree node.

children - The list of daughters of this tree. The children may be a (possibly empty) List of children or null

Returns:

The new interior tree node