1 /* ====================================================================
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2000 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>;.
53 *
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
57 */
58 package net.sourceforge.jane.jjtree;
59
60 import net.sourceforge.jane.util.ExtendedEnumeration;
61
62 import org.apache.commons.collections.Predicate;
63
64 /***
65 * An enumerator over tokens.
66 */
67 class TokenEnumeration extends ExtendedEnumeration
68 {
69
70 private Token startToken;
71 private Token endToken;
72 private Token curToken;
73
74 /***
75 * Create a new <code>TokenEnumeration</code>.
76 */
77 public TokenEnumeration(Token aStart, Token anEnd, Predicate aPredicate)
78 {
79 super(aPredicate);
80 startToken = aStart;
81 endToken = anEnd;
82
83 curToken = startToken;
84 }
85
86 /***
87 * Returns <code>true</code> if there are more tokens.
88 */
89 public boolean hasMoreTokens()
90 {
91 return hasMoreElements();
92 }
93
94 /***
95 * Returns the next token.
96 */
97 public Token nextToken()
98 {
99 return (Token) nextElement();
100 }
101
102 /***
103 * Reset this enumeration to the beginning.
104 */
105 public void reset()
106 {
107 curToken = startToken;
108 }
109
110 /***
111 * Returns a <code>TokenEnumeration</code> that will iterate over a token
112 * of a given kind.
113 */
114 static public TokenEnumeration createEnumeration(Token start, Token end, final int kind)
115 {
116 return new TokenEnumeration(start, end, new Predicate() {
117 public boolean evaluate(Object obj) {
118 return ((Token) obj).kind == kind;
119 }
120 });
121 }
122
123 /***
124 * Returns <code>true</code> if there are not more elements in the
125 * current series.
126 */
127 protected boolean doCheckSize()
128 {
129 return curToken != endToken.next;
130 }
131
132 /***
133 * Returns the current element.
134 */
135 protected Object getCurrent()
136 {
137 return curToken;
138 }
139
140 /***
141 * Go to the next element.
142 */
143 protected void doNext()
144 {
145 curToken = curToken.next;
146 }
147
148 }
149
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