Class AlphanumericCollator

java.lang.Object
net.sf.saxon.expr.sort.AlphanumericCollator
All Implemented Interfaces:
StringCollator

public class AlphanumericCollator extends Object implements StringCollator
A Comparer that treats strings as an alternating sequence of alpha parts and numeric parts. The alpha parts are compared using a base collation supplied as a parameter; the numeric parts are compared numerically. "Numeric" here means a sequence of consecutive ASCII digits 0-9.

Note: this StringCollator produces an ordering that is not compatible with equals().

  • Field Details

  • Constructor Details

    • AlphanumericCollator

      public AlphanumericCollator(StringCollator base)
      Create an alphanumeric collation
      Parameters:
      base - the collation used to compare the alphabetic parts of the string
  • Method Details

    • getCollationURI

      public String getCollationURI()
      Get the collation URI. It must be possible to use this collation URI to reconstitute the collation
      Specified by:
      getCollationURI in interface StringCollator
      Returns:
      a collation URI that can be used to reconstruct the collation when an XSLT package is reloaded.
    • compareStrings

      public int compareStrings(CharSequence cs1, CharSequence cs2)
      Compare two objects.
      Specified by:
      compareStrings in interface StringCollator
      Parameters:
      cs1 - the first string
      cs2 - the second string
      Returns:
      <0 if a<b, 0 if a=b, >0 if a>b
    • comparesEqual

      public boolean comparesEqual(CharSequence s1, CharSequence s2)
      Compare two strings for equality. This may be more efficient than using compareStrings and testing whether the result is zero, but it must give the same result
      Specified by:
      comparesEqual in interface StringCollator
      Parameters:
      s1 - the first string
      s2 - the second string
      Returns:
      true if and only if the strings are considered equal,
    • getCollationKey

      public AtomicMatchKey getCollationKey(CharSequence cs)
      Get a collation key for comparing two Strings. The essential property of collation keys is that if two values are equal under the collation, then the collation keys are compare correctly under the equals() method.
      Specified by:
      getCollationKey in interface StringCollator
      Parameters:
      cs - the string whose collation key is required
      Returns:
      the collation key