1/*
2 * Copyright (c) 1997, 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
26package com.sun.tools.internal.xjc.reader.dtd;
27
28import java.util.ArrayList;
29import java.util.List;
30
31import com.sun.xml.internal.dtdparser.DTDEventListener;
32
33
34/**
35 * @author Kohsuke Kawaguchi
36 */
37final class ModelGroup extends Term {
38    enum Kind {
39        CHOICE, SEQUENCE
40    }
41
42    Kind kind;
43
44    private final List<Term> terms = new ArrayList<Term>();
45
46    void normalize(List<Block> r, boolean optional) {
47        switch(kind) {
48        case SEQUENCE:
49            for( Term t : terms )
50                t.normalize(r,optional);
51            return;
52        case CHOICE:
53            Block b = new Block(isOptional()||optional,isRepeated());
54            addAllElements(b);
55            r.add(b);
56            return;
57        }
58    }
59
60    void addAllElements(Block b) {
61        for( Term t : terms )
62            t.addAllElements(b);
63    }
64
65    boolean isOptional() {
66        switch(kind) {
67        case SEQUENCE:
68            for( Term t : terms )
69                if(!t.isOptional())
70                    return false;
71            return true;
72        case CHOICE:
73            for( Term t : terms )
74                if(t.isOptional())
75                    return true;
76            return false;
77        default:
78            throw new IllegalArgumentException();
79        }
80    }
81
82    boolean isRepeated() {
83        switch(kind) {
84        case SEQUENCE:
85            return true;
86        case CHOICE:
87            for( Term t : terms )
88                if(t.isRepeated())
89                    return true;
90            return false;
91        default:
92            throw new IllegalArgumentException();
93        }
94    }
95
96    void setKind(short connectorType) {
97        Kind k;
98        switch(connectorType) {
99        case DTDEventListener.SEQUENCE:
100            k = Kind.SEQUENCE;
101            break;
102        case DTDEventListener.CHOICE:
103            k = Kind.CHOICE;
104            break;
105        default:
106            throw new IllegalArgumentException();
107        }
108
109        assert kind==null || k==kind;
110        kind = k;
111    }
112
113    void addTerm(Term t) {
114        if (t instanceof ModelGroup) {
115            ModelGroup mg = (ModelGroup) t;
116            if(mg.kind==this.kind) {
117                terms.addAll(mg.terms);
118                return;
119            }
120        }
121        terms.add(t);
122    }
123
124
125    Term wrapUp() {
126        switch(terms.size()) {
127        case 0:
128            return EMPTY;
129        case 1:
130            assert kind==null;
131            return terms.get(0);
132        default:
133            assert kind!=null;
134            return this;
135        }
136    }
137
138}
139