1/*
2 * Copyright (c) 2005, 2012, 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 */
46package com.sun.xml.internal.rngom.digested;
47
48/**
49 * @author Kohsuke Kawaguchi (kk@kohsuke.org)
50 */
51public 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}
134