org.apache.druid.segment.filter

Class ValueMatchers

java.lang.Object

org.apache.druid.segment.filter.ValueMatchers

public class ValueMatchers
extends Object

Utility methods for creating ValueMatcher instances. Mainly used by ConstantValueMatcherFactory and PredicateValueMatcherFactory.

Method Summary

Modifier and Type	Method and Description
static ValueMatcher	makeDoubleValueMatcher(BaseDoubleColumnValueSelector selector, DruidPredicateFactory predicateFactory) Creates a predicate-based ValueMatcher for a double-typed selector.
static ValueMatcher	makeDoubleValueMatcher(BaseDoubleColumnValueSelector selector, String value) Creates a constant-based ValueMatcher for a double-typed selector.
static ValueMatcher	makeFloatValueMatcher(BaseFloatColumnValueSelector selector, DruidPredicateFactory predicateFactory) Creates a predicate-based ValueMatcher for a float-typed selector.
static ValueMatcher	makeFloatValueMatcher(BaseFloatColumnValueSelector selector, String value) Creates a constant-based ValueMatcher for a float-typed selector.
static ValueMatcher	makeLongValueMatcher(BaseLongColumnValueSelector selector, DruidPredicateFactory predicateFactory)
static ValueMatcher	makeLongValueMatcher(BaseLongColumnValueSelector selector, String value)
static ValueMatcher	makeStringValueMatcher(DimensionSelector selector, DruidPredicateFactory predicateFactory, boolean hasMultipleValues) Creates a predicate-based ValueMatcher for a string-typed selector.
static ValueMatcher	makeStringValueMatcher(DimensionSelector selector, String value, boolean hasMultipleValues) Creates a constant-based ValueMatcher for a string-typed selector.
static Boolean	toBooleanIfPossible(DimensionDictionarySelector selector, boolean hasMultipleValues, com.google.common.base.Predicate<String> predicate) If applying predicate to selector would always return a constant, returns that constant.

Methods inherited from class java.lang.Object

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

Method Detail

makeStringValueMatcher

public static ValueMatcher makeStringValueMatcher(DimensionSelector selector,
                                                  String value,
                                                  boolean hasMultipleValues)

Creates a constant-based ValueMatcher for a string-typed selector.

Parameters:

selector - column selector

value - value to match

hasMultipleValues - whether the column selector *might* have multiple values

makeStringValueMatcher

public static ValueMatcher makeStringValueMatcher(DimensionSelector selector,
                                                  DruidPredicateFactory predicateFactory,
                                                  boolean hasMultipleValues)

Creates a predicate-based ValueMatcher for a string-typed selector.

Parameters:

selector - column selector

predicateFactory - predicate to match

hasMultipleValues - whether the column selector *might* have multiple values

makeFloatValueMatcher

public static ValueMatcher makeFloatValueMatcher(BaseFloatColumnValueSelector selector,
                                                 String value)

Creates a constant-based ValueMatcher for a float-typed selector.

Parameters:

selector - column selector

value - value to match

makeLongValueMatcher

public static ValueMatcher makeLongValueMatcher(BaseLongColumnValueSelector selector,
                                                String value)

makeLongValueMatcher

public static ValueMatcher makeLongValueMatcher(BaseLongColumnValueSelector selector,
                                                DruidPredicateFactory predicateFactory)

makeFloatValueMatcher

public static ValueMatcher makeFloatValueMatcher(BaseFloatColumnValueSelector selector,
                                                 DruidPredicateFactory predicateFactory)

Creates a predicate-based ValueMatcher for a float-typed selector.

Parameters:

selector - column selector

predicateFactory - predicate to match

makeDoubleValueMatcher

public static ValueMatcher makeDoubleValueMatcher(BaseDoubleColumnValueSelector selector,
                                                  String value)

Creates a constant-based ValueMatcher for a double-typed selector.

Parameters:

selector - column selector

value - value to match

makeDoubleValueMatcher

public static ValueMatcher makeDoubleValueMatcher(BaseDoubleColumnValueSelector selector,
                                                  DruidPredicateFactory predicateFactory)

Creates a predicate-based ValueMatcher for a double-typed selector.

Parameters:

selector - column selector

predicateFactory - predicate to match

toBooleanIfPossible

@Nullable
public static Boolean toBooleanIfPossible(DimensionDictionarySelector selector,
                                                    boolean hasMultipleValues,
                                                    com.google.common.base.Predicate<String> predicate)

If applying predicate to selector would always return a constant, returns that constant. Otherwise, returns null. This method would have been private, except it's also used by SingleValueStringVectorValueMatcher.

Parameters:

selector - string selector

hasMultipleValues - whether the selector *might* have multiple values

predicate - predicate to apply