opennlp.grok.realize
Class EdgeFactory

java.lang.Object
  |
  +--opennlp.grok.realize.EdgeFactory

public class EdgeFactory

extends java.lang.Object

The EdgeFactory is responsible for creating edges. A single edge factory instance per realization request is assumed.

Version:

$Revision: 1.12 $, $Date: 2003/02/07 13:14:57 $

Author:

Michael White

Field Summary

opennlp.common.parse.Lexicon	lexicon The lexicon used to create edges.
static java.lang.String	NO_SEM_FLAG Flag used in the lexicon to indicate a purely syntactic edge, with no associated semantics.
java.util.List	preds The elementary predications to be covered.
opennlp.common.parse.RuleGroup	rules The rules used to create edges.
java.util.List	targets The target phrases for computing n-gram precision.

Constructor Summary

EdgeFactory(opennlp.common.parse.Lexicon lexicon, opennlp.common.parse.RuleGroup rules, java.util.List preds, java.util.List targets)
Constructor.

Method Summary

java.util.List	createInitialEdges() Returns all lexical edges that cover some of the input semantics.
java.util.List	createNewEdges(Edge edge) Returns all edges that can be created by applying a unary rule to the given edge or by combining it with a purely syntactic edge.
java.util.List	createNewEdges(Edge edgeA, Edge edgeB, boolean bothDirections) Returns all edges that can be created by combining the given edges, with one or both directions tried according to the given flag.
boolean	pairedWith(Edge edgeA, Edge edgeB) Returns whether the indices for the two edges are in a PairedWith relation.

Methods inherited from class java.lang.Object

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

Field Detail

lexicon

public final opennlp.common.parse.Lexicon lexicon

The lexicon used to create edges.

rules

public final opennlp.common.parse.RuleGroup rules

The rules used to create edges.

preds

public final java.util.List preds

The elementary predications to be covered.

targets

public final java.util.List targets

The target phrases for computing n-gram precision.

NO_SEM_FLAG

public static final java.lang.String NO_SEM_FLAG

Flag used in the lexicon to indicate a purely syntactic edge, with no associated semantics.

See Also:

Constant Field Values

Constructor Detail

EdgeFactory

public EdgeFactory(opennlp.common.parse.Lexicon lexicon,
                   opennlp.common.parse.RuleGroup rules,
                   java.util.List preds,
                   java.util.List targets)

Constructor.

Method Detail

pairedWith

public boolean pairedWith(Edge edgeA,
                          Edge edgeB)

Returns whether the indices for the two edges are in a PairedWith relation.

createInitialEdges

public java.util.List createInitialEdges()

Returns all lexical edges that cover some of the input semantics. Attribute-value predicates are allowed to be unmatched. Also initializes edges for semantically null lexical items.

createNewEdges

public java.util.List createNewEdges(Edge edgeA,
                                     Edge edgeB,
                                     boolean bothDirections)

Returns all edges that can be created by combining the given edges, with one or both directions tried according to the given flag. The edges are assumed not to overlap semantically.

createNewEdges

public java.util.List createNewEdges(Edge edge)

Returns all edges that can be created by applying a unary rule to the given edge or by combining it with a purely syntactic edge.