Package org.springframework.data.keyvalue.core

Class SpelPropertyComparator<T>

java.lang.Object

org.springframework.data.keyvalue.core.SpelPropertyComparator<T>

Type Parameters:

T -

All Implemented Interfaces:

Comparator<T>

public class SpelPropertyComparator<T>
extends Object
implements Comparator<T>

Comparator implementation using SpelExpression.

Author:

Christoph Strobl, Oliver Gierke, Mark Paluch

Constructor Summary

Constructors

Constructor	Description
SpelPropertyComparator(String path, org.springframework.expression.spel.standard.SpelExpressionParser parser)	Create new SpelPropertyComparator for the given property path an SpelExpressionParser.

Method Summary

Modifier and Type	Method	Description
SpelPropertyComparator<T>	asc()	Sort ascending.
protected String	buildExpressionForPath()	Create the expression raw value.
int	compare(T arg1, T arg2)
SpelPropertyComparator<T>	desc()	Sort descending.
protected org.springframework.expression.spel.standard.SpelExpression	getExpression()	Parse values to SpelExpression
String	getPath()	Get dot path to property.
SpelPropertyComparator<T>	nullsFirst()	Sort null values first.
SpelPropertyComparator<T>	nullsLast()	Sort null values last.

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

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Details

SpelPropertyComparator

public SpelPropertyComparator(String path,
 org.springframework.expression.spel.standard.SpelExpressionParser parser)

Create new SpelPropertyComparator for the given property path an SpelExpressionParser.

Parameters:

path - must not be null or empty.

parser - must not be null.

Method Details

asc

public SpelPropertyComparator<T> asc()

Sort ascending.

Returns:

desc

public SpelPropertyComparator<T> desc()

Sort descending.

Returns:

nullsFirst

public SpelPropertyComparator<T> nullsFirst()

Sort null values first.

Returns:

nullsLast

public SpelPropertyComparator<T> nullsLast()

Sort null values last.

Returns:

getExpression

protected org.springframework.expression.spel.standard.SpelExpression getExpression()

Parse values to SpelExpression

Returns:

buildExpressionForPath

protected String buildExpressionForPath()

Create the expression raw value.

Returns:

compare

public int compare(T arg1,
 T arg2)

Specified by:

compare in interface Comparator<T>

getPath

public String getPath()

Get dot path to property.

Returns: