Package com.tangosol.coherence.rest.util

Class ComparatorBuilder

java.lang.Object

com.tangosol.coherence.rest.util.ComparatorBuilder

public class ComparatorBuilder
extends Object

Comparator builder that provides a small set of builder methods to simplify creation of a chain of ExtractorComparators from given ValueExtractors.

Author:

ic 2011.06.30

See Also:

ExtractorComparator, ValueExtractor

Constructor Summary

Constructors

Constructor	Description
ComparatorBuilder()

Method Summary

Modifier and Type	Method	Description
protected void	add(Comparator comparator)	Append specified comparator to the end of list of comparators owned by this builder.
ComparatorBuilder	asc(ValueExtractor extractor)	Add comparator to this builder.
ComparatorBuilder	asc(String sExpr)	Add comparator to this builder.
Comparator	build()	Build comparator.
protected Comparator	createComparator(ValueExtractor extractor)	Create extractor comparator.
protected Comparator	createComparator(String sExpr)	Create extractor comparator.
protected ValueExtractor	createExtractor(String sExpr)	Create expression extractor.
ComparatorBuilder	desc(ValueExtractor extractor)	Add comparator to this builder.
ComparatorBuilder	desc(String sExpr)	Add comparator to builder.
protected Comparator	inverse(Comparator comparator)	Reverse ordering of a given comparator.
protected Comparator	safe(Comparator comparator)	Wrap given comparator with a SafeComparator.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparatorBuilder

public ComparatorBuilder()

Method Detail

asc

public ComparatorBuilder asc(String sExpr)

Add comparator to this builder.

Parameters:

sExpr - expression used to create an expression extractor

Returns:

this ComparatorBuilder

asc

public ComparatorBuilder asc(ValueExtractor extractor)

Add comparator to this builder.

Parameters:

extractor - extractor used to extract values

Returns:

this ComparatorBuilder

desc

public ComparatorBuilder desc(String sExpr)

Add comparator to builder.

Parameters:

sExpr - expression used to create expression extractor

Returns:

this ComparatorBuilder

desc

public ComparatorBuilder desc(ValueExtractor extractor)

Add comparator to this builder.

Parameters:

extractor - extractor used to extract values

Returns:

this ComparatorBuilder

build

public Comparator build()

Build comparator.

Returns:

comparator representing current state of builder

add

protected void add(Comparator comparator)

Append specified comparator to the end of list of comparators owned by this builder.

Parameters:

comparator - comparator to add

inverse

protected Comparator inverse(Comparator comparator)

Reverse ordering of a given comparator.

Parameters:

comparator - comparator to be reversed

Returns:

a reversed comparator

createComparator

protected Comparator createComparator(String sExpr)

Create extractor comparator.

Parameters:

sExpr - expression used to create expression extractor

Returns:

comparator that will evaluate given expression when comparing values

createComparator

protected Comparator createComparator(ValueExtractor extractor)

Create extractor comparator.

Parameters:

extractor - extractor used while comparing values

Returns:

comparator that will use given extractor when comparing values

safe

protected Comparator safe(Comparator comparator)

Wrap given comparator with a SafeComparator.

Parameters:

comparator - to be wrapped

Returns:

SafeComparator wrapping given comparator

createExtractor

protected ValueExtractor createExtractor(String sExpr)

Create expression extractor.

Parameters:

sExpr - expression to create extractor for

Returns:

extractor for the specified expression