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.digested;
  27 
  28 
  29 
  30 /**
  31  * @author Kohsuke Kawaguchi (kk@kohsuke.org)
  32  */
  33 public class DPatternWalker implements DPatternVisitor<Void> {
  34     public Void onAttribute(DAttributePattern p) {
  35         return onXmlToken(p);
  36     }
  37 
  38     protected Void onXmlToken(DXmlTokenPattern p) {
  39         return onUnary(p);
  40     }
  41 
  42     public Void onChoice(DChoicePattern p) {
  43         return onContainer(p);
  44     }
  45 
  46     protected Void onContainer(DContainerPattern p) {
  47         for( DPattern c=p.firstChild(); c!=null; c=c.next )
  48             c.accept(this);
  49         return null;
  50     }
  51 
  52     public Void onData(DDataPattern p) {
  53         return null;
  54     }
  55 
  56     public Void onElement(DElementPattern p) {
  57         return onXmlToken(p);
  58     }
  59 
  60     public Void onEmpty(DEmptyPattern p) {
  61         return null;
  62     }
  63 
  64     public Void onGrammar(DGrammarPattern p) {
  65         return p.getStart().accept(this);
  66     }
  67 
  68     public Void onGroup(DGroupPattern p) {
  69         return onContainer(p);
  70     }
  71 
  72     public Void onInterleave(DInterleavePattern p) {
  73         return onContainer(p);
  74     }
  75 
  76     public Void onList(DListPattern p) {
  77         return onUnary(p);
  78     }
  79 
  80     public Void onMixed(DMixedPattern p) {
  81         return onUnary(p);
  82     }
  83 
  84     public Void onNotAllowed(DNotAllowedPattern p) {
  85         return null;
  86     }
  87 
  88     public Void onOneOrMore(DOneOrMorePattern p) {
  89         return onUnary(p);
  90     }
  91 
  92     public Void onOptional(DOptionalPattern p) {
  93         return onUnary(p);
  94     }
  95 
  96     public Void onRef(DRefPattern p) {
  97         return p.getTarget().getPattern().accept(this);
  98     }
  99 
 100     public Void onText(DTextPattern p) {
 101         return null;
 102     }
 103 
 104     public Void onValue(DValuePattern p) {
 105         return null;
 106     }
 107 
 108     public Void onZeroOrMore(DZeroOrMorePattern p) {
 109         return onUnary(p);
 110     }
 111 
 112     protected Void onUnary(DUnaryPattern p) {
 113         return p.getChild().accept(this);
 114     }
 115 }