org.galagosearch.core.retrieval.structured
Class FeatureFactory

java.lang.Object
  org.galagosearch.core.retrieval.structured.FeatureFactory

public class FeatureFactory
extends java.lang.Object

Author:

trevor

Constructor Summary

FeatureFactory(org.galagosearch.tupleflow.Parameters parameters)

Method Summary

java.lang.Class<StructuredIterator>	getClass(Node node)
java.lang.String	getClassName(Node node)
java.lang.String	getFeatureClassName(org.galagosearch.tupleflow.Parameters parameters)
StructuredIterator	getIterator(Node node, java.util.ArrayList<StructuredIterator> childIterators) Given a query node, generates the corresponding iterator object that can be used for structured retrieval.
NodeType	getNodeType(Node node)

Methods inherited from class java.lang.Object

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

Constructor Detail

FeatureFactory

public FeatureFactory(org.galagosearch.tupleflow.Parameters parameters)

Method Detail

getClassName

public java.lang.String getClassName(Node node)
                              throws java.lang.Exception

Throws:

java.lang.Exception

getFeatureClassName

public java.lang.String getFeatureClassName(org.galagosearch.tupleflow.Parameters parameters)
                                     throws java.lang.Exception

Throws:

java.lang.Exception

getClass

public java.lang.Class<StructuredIterator> getClass(Node node)
                                             throws java.lang.Exception

Throws:

java.lang.Exception

getNodeType

public NodeType getNodeType(Node node)
                     throws java.lang.Exception

Throws:

java.lang.Exception

getIterator

public StructuredIterator getIterator(Node node,
                                      java.util.ArrayList<StructuredIterator> childIterators)
                               throws java.lang.Exception

Given a query node, generates the corresponding iterator object that can be used for structured retrieval. This method just calls getClass() on the node, then instantiates the resulting class. If the class returned by getClass() is a ScoringFunction, it must contain a constructor that takes a single Parameters object. If the class returned by getFeatureClass() is some kind of StructuredIterator (either a ScoreIterator, ExtentIterator or CountIterator), it must take a Parameters object and an ArrayList of DocumentDataIterators as parameters.

Throws:

java.lang.Exception