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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.
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 |
public Tree newLeaf(String word)
String
passed in.
word
- The word that will go into the tree label.
public Tree newTreeNode(String parent, List children)
String
passed in.
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
public Tree newLeaf(Label label)
label
- The label for the leaf node
public Tree newTreeNode(Label label, List children)
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
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