1 /*
   2  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.rngom.binary;
  27 
  28 import com.sun.xml.internal.rngom.binary.visitor.*;
  29 
  30 public class GroupPattern extends BinaryPattern {
  31   GroupPattern(Pattern p1, Pattern p2) {
  32     super(p1.isNullable() && p2.isNullable(),
  33           combineHashCode(GROUP_HASH_CODE, p1.hashCode(), p2.hashCode()),
  34           p1,
  35           p2);
  36   }
  37 
  38   Pattern expand(SchemaPatternBuilder b) {
  39     Pattern ep1 = p1.expand(b);
  40     Pattern ep2 = p2.expand(b);
  41     if (ep1 != p1 || ep2 != p2)
  42       return b.makeGroup(ep1, ep2);
  43     else
  44       return this;
  45   }
  46 
  47   void checkRestrictions(int context, DuplicateAttributeDetector dad, Alphabet alpha) throws RestrictionViolationException {
  48     switch (context) {
  49     case START_CONTEXT:
  50       throw new RestrictionViolationException("start_contains_group");
  51     case DATA_EXCEPT_CONTEXT:
  52       throw new RestrictionViolationException("data_except_contains_group");
  53     }
  54     super.checkRestrictions(context == ELEMENT_REPEAT_CONTEXT
  55                             ? ELEMENT_REPEAT_GROUP_CONTEXT
  56                             : context,
  57                             dad,
  58                             alpha);
  59     if (context != LIST_CONTEXT
  60         && !contentTypeGroupable(p1.getContentType(), p2.getContentType()))
  61       throw new RestrictionViolationException("group_string");
  62   }
  63 
  64   public void accept(PatternVisitor visitor) {
  65     visitor.visitGroup(p1, p2);
  66   }
  67   public Object apply(PatternFunction f) {
  68     return f.caseGroup(this);
  69   }
  70 }