edu.nyu.jet.pat

Class Pat

java.lang.Object

edu.nyu.jet.pat.Pat

public class Pat
extends Object

contains static procedures used in pattern matching.

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	trace if true, write a message to the Console whenever a pattern adds an annotation to a Document.

Constructor Summary

Constructors

Constructor and Description
Pat()

Method Summary

Methods

Modifier and Type	Method and Description
static HashMap	matchAnnotations(Annotation ann1, Annotation ann2, HashMap bindings) determines whether annotations ann1 and ann2 can be matched (unified), consistent with variable bindings bindings.
static HashMap	matchFS(FeatureSet fs1, FeatureSet fs2, HashMap bindings) determines whether feature sets fs1 and fs2 can be matched (unified), consistent with variable bindings bindings.

Methods inherited from class java.lang.Object

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

Field Detail

trace

public static boolean trace

if true, write a message to the Console whenever a pattern adds an annotation to a Document.

Constructor Detail

Pat

public Pat()

Method Detail

matchAnnotations

public static HashMap matchAnnotations(Annotation ann1,
                       Annotation ann2,
                       HashMap bindings)

determines whether annotations ann1 and ann2 can be matched (unified), consistent with variable bindings bindings. Two annotations can be matched if they have the same type and their features can be matched. Both ann1 and ann2 may include variables, so the matching process may cause more variables to be bound.

Returns:

if the annotations can be unified, a HashMap with all (existing and new) bindings; otherwise null.

matchFS

public static HashMap matchFS(FeatureSet fs1,
              FeatureSet fs2,
              HashMap bindings)

determines whether feature sets fs1 and fs2 can be matched (unified), consistent with variable bindings bindings. Both fs1 and fs2 may include variables, so the matching process may cause more variables to be bound.

Returns:

if the feature sets can be unified, a HashMap with all (existing and new) bindings; otherwise null.