Package net.sf.saxon.expr.sort

Class DecimalSortComparer

java.lang.Object
net.sf.saxon.expr.sort.DecimalSortComparer
All Implemented Interfaces:
AtomicComparer
public class DecimalSortComparer extends Object implements AtomicComparer
An AtomicComparer used for sorting values that are known to be instances of xs:decimal (including xs:integer), It also supports a separate method for getting a collation key to test equality of items

  • Method Details

    • getDecimalSortComparerInstance

      public static DecimalSortComparer getDecimalSortComparerInstance()

    • getCollator

      public StringCollator getCollator()
      Description copied from interface: AtomicComparer
      Get the collation used by this AtomicComparer if any
      Specified by:
      getCollator in interface AtomicComparer
      Returns:
      the collation used for comparing strings, or null if not applicable

    • provideContext

      public AtomicComparer provideContext(XPathContext context)
      Supply the dynamic context in case this is needed for the comparison
      Specified by:
      provideContext in interface AtomicComparer
      Parameters:
      context - the dynamic evaluation context
      Returns:
      either the original AtomicComparer, or a new AtomicComparer in which the context is known. The original AtomicComparer is not modified

    • compareAtomicValues

      public int compareAtomicValues(AtomicValue a, AtomicValue b)
      Compare two AtomicValue objects according to the rules for their data type. UntypedAtomic values are compared as if they were strings; if different semantics are wanted, the conversion must be done by the caller.
      Specified by:
      compareAtomicValues in interface AtomicComparer
      Parameters:
      a - the first object to be compared. This must be an AtomicValue and it must implement Comparable with context-free XPath comparison semantics
      b - the second object to be compared. This must be an AtomicValue and it must implement Comparable with context-free XPath comparison semantics
      Returns:
      <0 if a<b, 0 if a=b, >0 if a>b
      Throws:
      ClassCastException - if the objects are not comparable

    • comparesEqual

      public boolean comparesEqual(AtomicValue a, AtomicValue b)
      Compare two AtomicValue objects for equality according to the rules for their data type. UntypedAtomic values are compared by converting to the type of the other operand.
      Specified by:
      comparesEqual in interface AtomicComparer
      Parameters:
      a - the first object to be compared. This must be an AtomicValue and it must implement equals() with context-free XPath comparison semantics
      b - the second object to be compared. This must be an AtomicValue and it must implement equals() with context-free XPath comparison semantics
      Returns:
      true if the values are equal, false if not
      Throws:
      ClassCastException - if the objects are not comparable

    • save

      public String save()
      Create a string representation of this AtomicComparer that can be saved in a compiled package and used to reconstitute the AtomicComparer when the package is reloaded
      Specified by:
      save in interface AtomicComparer
      Returns:
      a string representation of the AtomicComparer