Package com.google.gerrit.index.query

Class IndexPredicate<I>

java.lang.Object

com.google.gerrit.index.query.Predicate<I>

com.google.gerrit.index.query.OperatorPredicate<I>

com.google.gerrit.index.query.IndexPredicate<I>

All Implemented Interfaces:

Matchable<I>

Direct Known Subclasses:

ChangeIndexPredicate, IntegerRangePredicate, RegexPredicate, TimestampRangePredicate

public abstract class IndexPredicate<I>
extends OperatorPredicate<I>
implements Matchable<I>

Predicate that is mapped to a field in the index.

Nested Class Summary

Nested classes/interfaces inherited from class com.google.gerrit.index.query.Predicate

Predicate.Any<T>

Field Summary

Fields inherited from class com.google.gerrit.index.query.OperatorPredicate

name, value

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	IndexPredicate(SchemaFieldDefs.SchemaField<I,?> def, String value)
protected	IndexPredicate(SchemaFieldDefs.SchemaField<I,?> def, String name, String value)

Method Summary

Modifier and Type	Method	Description
int	getCost()	Returns a cost estimate to run this predicate, higher figures cost more.
SchemaFieldDefs.SchemaField<I,?>	getField()
FieldType<?>	getType()
boolean	match(I doc)	This method matches documents without calling an index subsystem.

Methods inherited from class com.google.gerrit.index.query.OperatorPredicate

copy, equals, getOperator, getValue, hashCode, toString

Methods inherited from class com.google.gerrit.index.query.Predicate

and, and, any, asMatchable, estimateCost, getChild, getChildCount, getChildren, getFlattenedPredicateList, getLeafCount, getPredicateString, isLeaf, isMatchable, not, or, or, supportedForQueries

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

IndexPredicate

protected IndexPredicate(SchemaFieldDefs.SchemaField<I,?> def,
 String value)

IndexPredicate

protected IndexPredicate(SchemaFieldDefs.SchemaField<I,?> def,
 String name,
 String value)

Method Details

getField

public SchemaFieldDefs.SchemaField<I,?> getField()

getType

public FieldType<?> getType()

match

public boolean match(I doc)

This method matches documents without calling an index subsystem. For primitive fields (e.g. integer, long) , the matching logic is consistent across this method and all known index implementations. For text fields (i.e. prefix and full-text) the semantics vary between this implementation and known index implementations:

Prefix: Lucene as well as match(Object) matches terms as true prefixes (prefix:foo -> `foo bar` matches, but `baz foo bar` does not match). The index implementation at Google tokenizes both the query and the indexed text and matches tokens individually (prefix:fo ba -> `baz foo bar` matches).

Full text: Lucene uses a PhraseQuery to search for terms in full text fields in-order. The index implementation at Google as well as match(Object) tokenizes both the query and the indexed text and matches tokens individually.

Specified by:

match in interface Matchable<I>

Returns:

true if the predicate matches the provided I.

getCost

public int getCost()

Description copied from interface: Matchable

Returns a cost estimate to run this predicate, higher figures cost more.

Specified by:

getCost in interface Matchable<I>