org.springframework.core.convert.converter

Class ConvertingComparator<S,T>

java.lang.Object

org.springframework.core.convert.converter.ConvertingComparator<S,T>

Type Parameters:

S - the source type

T - the target type

All Implemented Interfaces:

Comparator<S>

public class ConvertingComparator<S,T>
extends Object
implements Comparator<S>

A Comparator that converts values before they are compared.

The specified Converter will be used to convert each value before it is passed to the underlying Comparator.

Since:

3.2

Author:

Phillip Webb

Constructor Summary

Constructors

Constructor and Description
ConvertingComparator(Comparator<T> comparator, ConversionService conversionService, Class<? extends T> targetType) Create a new ConvertingComparator instance.
ConvertingComparator(Comparator<T> comparator, Converter<S,T> converter) Create a new ConvertingComparator instance.
ConvertingComparator(Converter<S,T> converter) Create a new ConvertingComparator instance.

Method Summary

Modifier and Type	Method and Description
int	compare(S o1, S o2)
static <K,V> ConvertingComparator<Map.Entry<K,V>,K>	mapEntryKeys(Comparator<K> comparator) Create a new ConvertingComparator that compares map entries based on their keys.
static <K,V> ConvertingComparator<Map.Entry<K,V>,V>	mapEntryValues(Comparator<V> comparator) Create a new ConvertingComparator that compares map entries based on their values.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

ConvertingComparator

public ConvertingComparator(Converter<S,T> converter)

Create a new ConvertingComparator instance.

Parameters:

converter - the converter

ConvertingComparator

public ConvertingComparator(Comparator<T> comparator,
                            Converter<S,T> converter)

Create a new ConvertingComparator instance.

Parameters:

comparator - the underlying comparator used to compare the converted values

converter - the converter

ConvertingComparator

public ConvertingComparator(Comparator<T> comparator,
                            ConversionService conversionService,
                            Class<? extends T> targetType)

Create a new ConvertingComparator instance.

Parameters:

comparator - the underlying comparator

conversionService - the conversion service

targetType - the target type

Method Detail

compare

public int compare(S o1,
                   S o2)

Specified by:

compare in interface Comparator<S>

mapEntryKeys

public static <K,V> ConvertingComparator<Map.Entry<K,V>,K> mapEntryKeys(Comparator<K> comparator)

Create a new ConvertingComparator that compares map entries based on their keys.

Parameters:

comparator - the underlying comparator used to compare keys

Returns:

a new ConvertingComparator instance

mapEntryValues

public static <K,V> ConvertingComparator<Map.Entry<K,V>,V> mapEntryValues(Comparator<V> comparator)

Create a new ConvertingComparator that compares map entries based on their values.

Parameters:

comparator - the underlying comparator used to compare values

Returns:

a new ConvertingComparator instance