edu.nyu.jet.parser

Class HeadRule

java.lang.Object

edu.nyu.jet.parser.HeadRule

public class HeadRule
extends Object

Head rule.

Author:

Akira ODA

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HeadRule.HeadRuleEntry Entry of head rule.
static class	HeadRule.ScanDirection

Method Summary

Methods

Modifier and Type	Method and Description
void	addEntry(String category, HeadRule.ScanDirection direction, List<String> priorityList) Adds rule entry
void	apply(ParseTreeNode tree) Applys head rule and sets head index each node in the parse tree.
static HeadRule	createDefaultRule() Creates HeadRule which has default rules.
static HeadRule	getDefaultRule() Returns default rule instance.
int	getHead(ParseTreeNode node) Returns head element's index in node's children.
static HeadRule	getRule(File file) Returns rule instance which is read from file.
static HeadRule	getRule(Reader in) Returns rule instance which is read from java.io.Reader object.

Methods inherited from class java.lang.Object

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

Method Detail

createDefaultRule

public static HeadRule createDefaultRule()

Creates HeadRule which has default rules.

Returns:

created rule instance

getDefaultRule

public static HeadRule getDefaultRule()

Returns default rule instance.

Returns:

getRule

public static HeadRule getRule(Reader in)
                        throws IOException,
                               InvalidFormatException

Returns rule instance which is read from java.io.Reader object.

Parameters:

in -

Returns:

Throws:

IOException

InvalidFormatException

getRule

public static HeadRule getRule(File file)
                        throws IOException,
                               InvalidFormatException

Returns rule instance which is read from file.

Parameters:

file -

Returns:

Throws:

IOException

InvalidFormatException

getHead

public int getHead(ParseTreeNode node)

Returns head element's index in node's children.

Parameters:

node - target parse tree node

Returns:

head element's index which is zero origin, or -1 if it cannot determine head element.

apply

public void apply(ParseTreeNode tree)

Applys head rule and sets head index each node in the parse tree.

Parameters:

tree -

addEntry

public void addEntry(String category,
            HeadRule.ScanDirection direction,
            List<String> priorityList)

Adds rule entry

Parameters:

category - target category

direction - scan direction

priorityList - head priority list