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.digested;
  47 
  48 /**
  49  * @author Kohsuke Kawaguchi (kk@kohsuke.org)
  50  */
  51 public class DPatternWalker implements DPatternVisitor<Void> {
  52     public Void onAttribute(DAttributePattern p) {
  53         return onXmlToken(p);
  54     }
  55 
  56     protected Void onXmlToken(DXmlTokenPattern p) {
  57         return onUnary(p);
  58     }
  59 
  60     public Void onChoice(DChoicePattern p) {
  61         return onContainer(p);
  62     }
  63 
  64     protected Void onContainer(DContainerPattern p) {
  65         for( DPattern c=p.firstChild(); c!=null; c=c.next )
  66             c.accept(this);
  67         return null;
  68     }
  69 
  70     public Void onData(DDataPattern p) {
  71         return null;
  72     }
  73 
  74     public Void onElement(DElementPattern p) {
  75         return onXmlToken(p);
  76     }
  77 
  78     public Void onEmpty(DEmptyPattern p) {
  79         return null;
  80     }
  81 
  82     public Void onGrammar(DGrammarPattern p) {
  83         return p.getStart().accept(this);
  84     }
  85 
  86     public Void onGroup(DGroupPattern p) {
  87         return onContainer(p);
  88     }
  89 
  90     public Void onInterleave(DInterleavePattern p) {
  91         return onContainer(p);
  92     }
  93 
  94     public Void onList(DListPattern p) {
  95         return onUnary(p);
  96     }
  97 
  98     public Void onMixed(DMixedPattern p) {
  99         return onUnary(p);
 100     }
 101 
 102     public Void onNotAllowed(DNotAllowedPattern p) {
 103         return null;
 104     }
 105 
 106     public Void onOneOrMore(DOneOrMorePattern p) {
 107         return onUnary(p);
 108     }
 109 
 110     public Void onOptional(DOptionalPattern p) {
 111         return onUnary(p);
 112     }
 113 
 114     public Void onRef(DRefPattern p) {
 115         return p.getTarget().getPattern().accept(this);
 116     }
 117 
 118     public Void onText(DTextPattern p) {
 119         return null;
 120     }
 121 
 122     public Void onValue(DValuePattern p) {
 123         return null;
 124     }
 125 
 126     public Void onZeroOrMore(DZeroOrMorePattern p) {
 127         return onUnary(p);
 128     }
 129 
 130     protected Void onUnary(DUnaryPattern p) {
 131         return p.getChild().accept(this);
 132     }
 133 }