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Java > Open Source Codes > jbet > InstrEnum


1 /*
2  * JBET - Java Binary Enhancement Tool
3  * Copyright (c) 2003 Networks Associates Technology, Inc.
4  *
5  * This software was developed under DARPA/SPAWAR contract
6  * N66001-00-C-8602 "SPMA" as part of the
7  * DARPA OASIS research program.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in the
16  * documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30
31 package jbet;
32 import java.util.*;
33
34
35 /**
36  * Implements an Java enumeration interface (with extensions peek() and
37  * nextInstr()) for a linked list of JBET Instructions (part of a Snippit).
38  *
39  * $Id: InstrEnum.java,v 1.4 2003/09/09 17:31:54 areisse Exp $
40  *
41  * @see Snippit.instrs
42  *
43  * @author Larry D'Anna
44  * @version
45  */
46
47 public class InstrEnum implements Enumeration {
48     public Instruction ptr;
49
50     public InstrEnum(Instruction i) { ptr = i; }
51
52     public boolean hasMoreElements() { return ptr != null; }
53
54     public Instruction peek() { return ptr; };
55
56     public Instruction nextInstr() {
57     Instruction ret = ptr;
58     ptr = ptr.next;
59     return ret;
60     };
61
62     public Object JavaDoc nextElement() { return nextInstr(); }
63 }
64
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