package com.thaiopensource.relaxng.pattern; class EmptyPattern extends Pattern { EmptyPattern() { super(true, EMPTY_CONTENT_TYPE, EMPTY_HASH_CODE); } boolean samePattern(Pattern other) { return other instanceof EmptyPattern; } <T> T apply(PatternFunction<T> f) { return f.caseEmpty(this); } void checkRestrictions(int context, DuplicateAttributeDetector dad, Alphabet alpha) throws RestrictionViolationException { switch (context) { case DATA_EXCEPT_CONTEXT: throw new RestrictionViolationException("data_except_contains_empty"); case START_CONTEXT: throw new RestrictionViolationException("start_contains_empty"); } } }