Package net.sf.saxon.sort

Class RuleBasedSubstringMatcher

java.lang.Object
net.sf.saxon.sort.RuleBasedSubstringMatcher
All Implemented Interfaces:
Comparator, SubstringMatcher
public class RuleBasedSubstringMatcher extends Object implements SubstringMatcher
This class wraps a RuleBasedCollator to provide a SubstringMatcher. This users the facilities offered by the RuleBasedCollator to implement the XPath functions contains(), starts-with(), ends-with(), substring-before(), and substring-after().

  • Constructor Details

    • RuleBasedSubstringMatcher

      public RuleBasedSubstringMatcher(RuleBasedCollator collator)

  • Method Details

    • comparesEqual

      public boolean comparesEqual(String s1, String s2)
      Test whether one string is equal to another, according to the rules of the XPath compare() function. The result is true if and only if the compare() method returns zero: but the implementation may be more efficient than calling compare and testing the result for zero
      Specified by:
      comparesEqual in interface SubstringMatcher
      Parameters:
      s1 - the first string
      s2 - the second string
      Returns:
      true iff s1 equals s2

    • contains

      public boolean contains(String s1, String s2)
      Test whether one string contains another, according to the rules of the XPath contains() function
      Specified by:
      contains in interface SubstringMatcher
      Parameters:
      s1 - the containing string
      s2 - the contained string
      Returns:
      true iff s1 contains s2

    • endsWith

      public boolean endsWith(String s1, String s2)
      Test whether one string ends with another, according to the rules of the XPath ends-with() function
      Specified by:
      endsWith in interface SubstringMatcher
      Parameters:
      s1 - the containing string
      s2 - the contained string
      Returns:
      true iff s1 ends with s2

    • startsWith

      public boolean startsWith(String s1, String s2)
      Test whether one string starts with another, according to the rules of the XPath starts-with() function
      Specified by:
      startsWith in interface SubstringMatcher
      Parameters:
      s1 - the containing string
      s2 - the contained string
      Returns:
      true iff s1 starts with s2

    • substringAfter

      public String substringAfter(String s1, String s2)
      Return the part of a string after a given substring, according to the rules of the XPath substring-after() function
      Specified by:
      substringAfter in interface SubstringMatcher
      Parameters:
      s1 - the containing string
      s2 - the contained string
      Returns:
      the part of s1 that follows the first occurrence of s2

    • substringBefore

      public String substringBefore(String s1, String s2)
      Return the part of a string before a given substring, according to the rules of the XPath substring-before() function
      Specified by:
      substringBefore in interface SubstringMatcher
      Parameters:
      s1 - the containing string
      s2 - the contained string
      Returns:
      the part of s1 that precedes the first occurrence of s2

    • compare

      public int compare(Object o1, Object o2)
      Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

      The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)

      The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.

      Finally, the implementer must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.

      It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."

      Specified by:
      compare in interface Comparator
      Parameters:
      o1 - the first object to be compared.
      o2 - the second object to be compared.
      Returns:
      a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
      Throws:
      ClassCastException - if the arguments' types prevent them from being compared by this Comparator.

    • main

      public static void main(String[] args)
      Test program to output the sequence of collation element iterators for a given input string