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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.relaxng.pattern;

import org.xml.sax.SAXException;

abstract class BinaryPattern extends Pattern {
  final Pattern p1;
  final Pattern p2;

  BinaryPattern(boolean nullable, int hc, Pattern p1, Pattern p2) {
    super(nullable, Math.max(p1.getContentType(), p2.getContentType()), hc);
    this.p1 = p1;
    this.p2 = p2;
  }

  void checkRecursion(int depth) throws SAXException {
    p1.checkRecursion(depth);
    p2.checkRecursion(depth);
  }

  void checkRestrictions(int context, DuplicateAttributeDetector dad, Alphabet alpha)
    throws RestrictionViolationException {
    p1.checkRestrictions(context, dad, alpha);
    p2.checkRestrictions(context, dad, alpha);
  }

  boolean samePattern(Pattern other) {
    if (getClass() != other.getClass())
      return false;
    BinaryPattern b = (BinaryPattern)other;
    return p1 == b.p1 && p2 == b.p2;
  }

  Pattern getOperand1() {
    return p1;
  }

  Pattern getOperand2() {
    return p2;
  }
}