org.gcube.search.datafusion

Class DataFusion

java.lang.Object

org.gcube.search.datafusion.DataFusion

All Implemented Interfaces:

Serializable

public class DataFusion
extends Object
implements Serializable

Author:

Alex Antoniadis

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DataFusion(URI[] locators, String query) Instantiates data fusion for the records in the locators and the given query
DataFusion(URI[] locators, String query, Integer count) Instantiates data fusion for the records in the locators and the given query and returns up to the count records

Method Summary

Modifier and Type	Method and Description
URI	operate()
URI	rerank() Wrapper for the static rerankRecords(java.util.Iterator<org.gcube.search.datafusion.datatypes.PositionalRecordWrapper>, java.lang.String, int, java.util.List<java.lang.String>, java.lang.Boolean)
static URI	rerankRecords(Iterator<PositionalRecordWrapper> iter, String query, int count, List<String> snippetFields, Boolean includePosition) Takes an iterator of PositionalRecordWrappers and puts them in a lucene index.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataFusion

public DataFusion(URI[] locators,
                  String query)
           throws gr.uoa.di.madgik.grs.reader.GRS2ReaderException

Instantiates data fusion for the records in the locators and the given query

Parameters:

locators -

query -

Throws:

gr.uoa.di.madgik.grs.reader.GRS2ReaderException

DataFusion

public DataFusion(URI[] locators,
                  String query,
                  Integer count)
           throws gr.uoa.di.madgik.grs.reader.GRS2ReaderException

Instantiates data fusion for the records in the locators and the given query and returns up to the count records

Parameters:

locators -

query -

count -

Throws:

gr.uoa.di.madgik.grs.reader.GRS2ReaderException

Method Detail

operate

public URI operate()
            throws Exception

Returns:

gRS2 locator of the result

Throws:

Exception

rerank

public URI rerank()
           throws Exception

Wrapper for the static rerankRecords(java.util.Iterator<org.gcube.search.datafusion.datatypes.PositionalRecordWrapper>, java.lang.String, int, java.util.List<java.lang.String>, java.lang.Boolean)

Returns:

gRS2 locator of the reranked records

Throws:

Exception

rerankRecords

public static URI rerankRecords(Iterator<PositionalRecordWrapper> iter,
                                String query,
                                int count,
                                List<String> snippetFields,
                                Boolean includePosition)
                         throws Exception

Takes an iterator of PositionalRecordWrappers and puts them in a lucene index. Then it performs the query to rerank the records and returns the URI of the gRS of the result. The query is performed on an extra field that is either included the payload of the record field in the list of snippetFields or the actual payload of the record (if none of the snippetFields are included in the record). The actual payload is retrieved from the objectID field which is a URI (text extraction is used to parse the response). After the records are reranked based on the query we can rearrange the results based on their initial position of each record by setting includePosition to true. This rearrangement is done in RankedRecord.recalculateScores(java.util.Map<java.lang.String, java.lang.Long>, java.util.Map<java.lang.String, org.gcube.search.datafusion.datatypes.Pair>, java.lang.Boolean) and the actual calculation of the final score based on the lucene score and the initial position is done in RankedRecord.calcScore(org.gcube.search.datafusion.datatypes.RankedRecord)

Parameters:

iter -

query -

count -

snippetFields -

includePosition -

Returns:

the URI of the gRS of the result

Throws:

Exception