Class JRegexIterator

  • All Implemented Interfaces:
    RegexIterator, SequenceIterator

    public class JRegexIterator
    extends java.lang.Object
    implements RegexIterator
    Class JRegexIterator - provides an iterator over matched and unmatched substrings. This implementation of RegexIterator uses the JDK regular expression engine.
    • Constructor Detail

      • JRegexIterator

        public JRegexIterator​(java.lang.String string,
                              java.util.regex.Pattern pattern)
        Construct a RegexIterator. Note that the underlying matcher.find() method is called once to obtain each matching substring. But the iterator also returns non-matching substrings if these appear between the matching substrings.
        Parameters:
        string - the string to be analysed
        pattern - the regular expression
    • Method Detail

      • next

        public Item next()
        Get the next item in the sequence
        Specified by:
        next in interface SequenceIterator
        Returns:
        the next item in the sequence
      • current

        public Item current()
        Get the current item in the sequence
        Specified by:
        current in interface SequenceIterator
        Returns:
        the item most recently returned by next()
      • position

        public int position()
        Get the position of the current item in the sequence
        Specified by:
        position in interface SequenceIterator
        Returns:
        the position of the item most recently returned by next(), starting at 1
      • close

        public void close()
        Description copied from interface: SequenceIterator
        Close the iterator. This indicates to the supplier of the data that the client does not require any more items to be delivered by the iterator. This may enable the supplier to release resources. After calling close(), no further calls on the iterator should be made; if further calls are made, the effect of such calls is undefined.

        (Currently, closing an iterator is important only when the data is being "pushed" in another thread. Closing the iterator terminates that thread and means that it needs to do no additional work. Indeed, failing to close the iterator may cause the push thread to hang waiting for the buffer to be emptied.)

        Specified by:
        close in interface SequenceIterator
      • isMatching

        public boolean isMatching()
        Determine whether the current item is a matching item or a non-matching item
        Specified by:
        isMatching in interface RegexIterator
        Returns:
        true if the current item (the one most recently returned by next()) is an item that matches the regular expression, or false if it is an item that does not match
      • getRegexGroup

        public java.lang.String getRegexGroup​(int number)
        Get a substring that matches a parenthesised group within the regular expression
        Specified by:
        getRegexGroup in interface RegexIterator
        Parameters:
        number - the number of the group to be obtained
        Returns:
        the substring of the current item that matches the n'th parenthesized group within the regular expression
      • getRegexGroupIterator

        public SequenceIterator getRegexGroupIterator()
        Get a sequence containing all the regex groups (except group 0, because we want to use indexing from 1). This is used by the saxon:analyze-string() higher-order extension function.
        Specified by:
        getRegexGroupIterator in interface RegexIterator
      • processMatchingSubstring

        public void processMatchingSubstring​(XPathContext context,
                                             RegexIterator.OnGroup action)
                                      throws XPathException
        Process a matching substring, performing specified actions at the start and end of each captured subgroup. This method will always be called when operating in "push" mode; it writes its result to context.getReceiver(). The matching substring text is all written to the receiver, interspersed with calls to the RegexIterator.OnGroup methods onGroupStart() and onGroupEnd().
        Specified by:
        processMatchingSubstring in interface RegexIterator
        Parameters:
        context - the dynamic evaluation context
        action - defines the processing to be performed at the start and end of a group
        Throws:
        XPathException