Alphabet.java

/*
 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package com.sun.xml.internal.rngom.binary;

import com.sun.xml.internal.rngom.nc.ChoiceNameClass;
import com.sun.xml.internal.rngom.nc.NameClass;

class Alphabet {
  private NameClass nameClass;

  boolean isEmpty() {
    return nameClass == null;
  }

  void addElement(NameClass nc) {
    if (nameClass == null)
      nameClass = nc;
    else if (nc != null)
      nameClass = new ChoiceNameClass(nameClass, nc);
  }

  void addAlphabet(Alphabet a) {
    addElement(a.nameClass);
  }

  void checkOverlap(Alphabet a) throws RestrictionViolationException {
    if (nameClass != null
	&& a.nameClass != null
	&& nameClass.hasOverlapWith(a.nameClass))
      throw new RestrictionViolationException("interleave_element_overlap");
  }
}