Package com.google.appengine.api.search

Class MatchScorer

java.lang.Object

com.google.appengine.api.search.MatchScorer

Direct Known Subclasses:

RescoringMatchScorer

public class MatchScorer
extends Object

Assigns a document score based on frequency of terms in TextFields and HTMLFields.

If you add a MatchScorer to a SortOptions as in the following code:

  SortOptions sortOptions = SortOptions.newBuilder()
      .setMatchScorer(MatchScorer.newBuilder())
      .build();
 

then this will sort the documents in descending score order. The scores will be positive. If you want to sort in ascending order, then use the following code:

   SortOptions sortOptions = SortOptions.newBuilder()
       .setMatchScorer(MatchScorer.newBuilder())
       .addSortExpression(
           SortExpression.newBuilder()
               .setExpression(SortExpression.SCORE_FIELD_NAME)
               .setDirection(SortExpression.SortDirection.ASCENDING)
               .setDefaultValueNumeric(0.0))
       .build();
 

In this example, the score will be negative.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MatchScorer.Builder	A builder that constructs MatchScorers.

Method Summary

Modifier and Type	Method	Description
static MatchScorer.Builder	newBuilder()	Creates and returns a MatchScorer Builder.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Details

newBuilder

public static MatchScorer.Builder newBuilder()

Creates and returns a MatchScorer Builder.

Returns:

a new MatchScorer.Builder. Set the parameters for scorer on the Builder, and use the MatchScorer.Builder.build() method to create a concrete instance of MatchScorer

toString

public String toString()

Overrides:

toString in class Object