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  * Copyright (C) 2004-2011
  27  *
  28  * Permission is hereby granted, free of charge, to any person obtaining a copy
  29  * of this software and associated documentation files (the "Software"), to deal
  30  * in the Software without restriction, including without limitation the rights
  31  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  32  * copies of the Software, and to permit persons to whom the Software is
  33  * furnished to do so, subject to the following conditions:
  34  *
  35  * The above copyright notice and this permission notice shall be included in
  36  * all copies or substantial portions of the Software.
  37  *
  38  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  39  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  40  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  41  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  42  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  43  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  44  * THE SOFTWARE.
  45  */
  46 package com.sun.xml.internal.rngom.binary;
  47 
  48 import com.sun.xml.internal.rngom.binary.visitor.PatternFunction;
  49 import com.sun.xml.internal.rngom.binary.visitor.PatternVisitor;
  50 
  51 public class InterleavePattern extends BinaryPattern {
  52   InterleavePattern(Pattern p1, Pattern p2) {
  53     super(p1.isNullable() && p2.isNullable(),
  54           combineHashCode(INTERLEAVE_HASH_CODE, p1.hashCode(), p2.hashCode()),
  55           p1,
  56           p2);
  57   }
  58     @Override
  59   Pattern expand(SchemaPatternBuilder b) {
  60     Pattern ep1 = p1.expand(b);
  61     Pattern ep2 = p2.expand(b);
  62     if (ep1 != p1 || ep2 != p2)
  63       return b.makeInterleave(ep1, ep2);
  64     else
  65       return this;
  66   }
  67     @Override
  68   void checkRestrictions(int context, DuplicateAttributeDetector dad, Alphabet alpha)
  69     throws RestrictionViolationException {
  70     switch (context) {
  71     case START_CONTEXT:
  72       throw new RestrictionViolationException("start_contains_interleave");
  73     case DATA_EXCEPT_CONTEXT:
  74       throw new RestrictionViolationException("data_except_contains_interleave");
  75     case LIST_CONTEXT:
  76       throw new RestrictionViolationException("list_contains_interleave");
  77     }
  78     if (context == ELEMENT_REPEAT_CONTEXT)
  79       context = ELEMENT_REPEAT_INTERLEAVE_CONTEXT;
  80     Alphabet a1;
  81     if (alpha != null && alpha.isEmpty())
  82       a1 = alpha;
  83     else
  84       a1 = new Alphabet();
  85     p1.checkRestrictions(context, dad, a1);
  86     if (a1.isEmpty())
  87       p2.checkRestrictions(context, dad, a1);
  88     else {
  89       Alphabet a2 = new Alphabet();
  90       p2.checkRestrictions(context, dad, a2);
  91       a1.checkOverlap(a2);
  92       if (alpha != null) {
  93         if (alpha != a1)
  94           alpha.addAlphabet(a1);
  95         alpha.addAlphabet(a2);
  96       }
  97     }
  98     if (context != LIST_CONTEXT
  99         && !contentTypeGroupable(p1.getContentType(), p2.getContentType()))
 100       throw new RestrictionViolationException("interleave_string");
 101     if (p1.getContentType() == MIXED_CONTENT_TYPE
 102         && p2.getContentType() == MIXED_CONTENT_TYPE)
 103       throw new RestrictionViolationException("interleave_text_overlap");
 104   }
 105 
 106   public void accept(PatternVisitor visitor) {
 107     visitor.visitInterleave(p1, p2);
 108   }
 109   public Object apply(PatternFunction f) {
 110     return f.caseInterleave(this);
 111   }
 112 }