Package com.tangosol.coherence.rest.util

Class ComparatorHelper

java.lang.Object

com.tangosol.coherence.rest.util.ComparatorHelper

public class ComparatorHelper
extends Object

ComparatorHelper is a utility class that provides a factory method used to create a java.util.Comparator instance from a string expression.

The string expression should be in the form of comma-separated values, where each value represents the name of property whose value is used as input to the Comparator#compare(Object, Object) method and an optional order string ("asc" or "desc"). If not specified, ascending order will be assumed.

For example, the string name:asc,dateOfBirth:desc will create the following comparator chain:

new ChainedComparator(new Comparator[]
{
new ExtractorComparator(new ReflectionExtractor("getName")),
new InverseComparator(new ExtractorComparator(new ReflectionExtractor("getDateOfBirth")))
});

Author:

ic 2011.06.30

Constructor Summary

Constructors

Constructor	Description
ComparatorHelper()

Method Summary

Modifier and Type	Method	Description
static Comparator	createComparator(String sExpr)	Create a new Comparator from the specified string.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparatorHelper

public ComparatorHelper()

Method Detail

createComparator

public static Comparator createComparator(String sExpr)

Create a new Comparator from the specified string.

Parameters:

sExpr - a string expression representing a Comparator. Contains a list of property name/ordering pairs, separated by a colon. For example:

• name:asc,dateOfBirth:desc
• address.state,address.zip:desc

Returns:

Comparator representing specified string expression