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Java > Open Source Codes > snmp > SNMPUInteger32


1 /*
2  * SNMP Package
3  *
4  * Copyright (C) 2004, Jonathan Sevy <jsevy@mcs.drexel.edu>
5  *
6  * This is free software. Redistribution and use in source and binary forms, with
7  * or without modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright notice, this
11  * list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  * derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
23  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  */
29
30
31 package snmp;
32
33 import java.math.*;
34
35
36
37 /**
38 * Defines a 32-bit unsigned integer value; wraps if initialized with a larger value.
39 * @see snmp.SNMPInteger
40 */
41 public class SNMPUInteger32 extends SNMPInteger
42 {
43     // maximum value is 2^32 - 1
44 private static BigInteger maxValue = new BigInteger("4294967295");
45     
46     
47     /**
48     * Initialize value to 0.
49     */
50     
51     public SNMPUInteger32()
52     {
53         this(0); // initialize value to 0
54 }
55     
56     
57     
58     
59     /**
60     * Initialize value to newValue; wrap if newValue too big for 32 bits.
61     */
62     
63     public SNMPUInteger32(long newValue)
64     {
65         tag = SNMPBERCodec.SNMPUINTEGER32;
66         
67         value = new BigInteger(new Long JavaDoc(newValue).toString());
68         
69         // wrap if value > maxValue
70 value = value.mod(maxValue);
71     }
72     
73     
74     /**
75     * Used to initialize from the BER encoding, usually received in a response from
76     * an SNMP device responding to an SNMPGetRequest.
77     * @throws SNMPBadValueException Indicates an invalid BER encoding supplied. Shouldn't
78     * occur in normal operation, i.e., when valid responses are received from devices.
79     */
80     
81     protected SNMPUInteger32(byte[] enc)
82         throws SNMPBadValueException
83     {
84         tag = SNMPBERCodec.SNMPUINTEGER32;
85         
86         extractValueFromBEREncoding(enc);
87         
88         // wrap if value > maxValue
89 value = value.mod(maxValue);
90     }
91     
92     
93     
94     
95     
96     /**
97     * Used to set the value with an instance of java.lang.Integer or
98     * java.lang.BigInteger. The value of the constructed SNMPUInteger32 object is the
99     * supplied value mod 2^32.
100     * @throws SNMPBadValueException Indicates an incorrect object type supplied.
101     */
102     
103     public void setValue(Object JavaDoc newValue)
104         throws SNMPBadValueException
105     {
106         if (newValue instanceof BigInteger)
107         {
108             value = (BigInteger)newValue;
109             value = value.mod(maxValue); // wrap when value exceeds 2^32
110 }
111         else if (newValue instanceof Integer JavaDoc)
112         {
113             value = value = new BigInteger(newValue.toString());
114             value = value.mod(maxValue); // wrap when value exceeds 2^32
115 }
116         else if (newValue instanceof String JavaDoc)
117         {
118             value = value = new BigInteger((String JavaDoc)newValue);
119             value = value.mod(maxValue); // wrap when value exceeds 2^32
120 }
121         else
122             throw new SNMPBadValueException(" Unsigned Integer: bad object supplied to set value ");
123     }
124     
125     
126     
127     
128 }
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