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:

  • Constructor Details

    • ComparatorBuilder

      public ComparatorBuilder()

  • Method Details

    • 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