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Java > Open Source Codes > javassist > bytecode > SignatureAttribute


1 /*
2  * Javassist, a Java-bytecode translator toolkit.
3  * Copyright (C) 1999-2005 Shigeru Chiba. All Rights Reserved.
4  *
5  * The contents of this file are subject to the Mozilla Public License Version
6  * 1.1 (the "License"); you may not use this file except in compliance with
7  * the License. Alternatively, the contents of this file may be used under
8  * the terms of the GNU Lesser General Public License Version 2.1 or later.
9  *
10  * Software distributed under the License is distributed on an "AS IS" basis,
11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12  * for the specific language governing rights and limitations under the
13  * License.
14  */
15
16 package javassist.bytecode;
17
18 import java.io.DataInputStream JavaDoc;
19 import java.io.IOException JavaDoc;
20 import java.util.Map JavaDoc;
21
22 /**
23  * <code>Signature_attribute</code>.
24  */
25 public class SignatureAttribute extends AttributeInfo {
26     /**
27      * The name of this attribute <code>"Signature"</code>.
28      */
29     public static final String JavaDoc tag = "Signature";
30
31     SignatureAttribute(ConstPool cp, int n, DataInputStream JavaDoc in)
32         throws IOException JavaDoc
33     {
34         super(cp, n, in);
35     }
36
37     /**
38      * Constructs a Signature attribute.
39      *
40      * @param cp a constant pool table.
41      * @param signature the signature represented by this attribute.
42      */
43     public SignatureAttribute(ConstPool cp, String JavaDoc signature) {
44         super(cp, tag);
45         int index = cp.addUtf8Info(signature);
46         byte[] bvalue = new byte[2];
47         bvalue[0] = (byte)(index >>> 8);
48         bvalue[1] = (byte)index;
49         set(bvalue);
50     }
51
52     /**
53      * Returns the signature indicated by <code>signature_index</code>.
54      */
55     public String JavaDoc getSignature() {
56         return getConstPool().getUtf8Info(ByteArray.readU16bit(get(), 0));
57     }
58
59     /**
60      * Makes a copy. Class names are replaced according to the
61      * given <code>Map</code> object.
62      *
63      * @param newCp the constant pool table used by the new copy.
64      * @param classnames pairs of replaced and substituted
65      * class names.
66      */
67     public AttributeInfo copy(ConstPool newCp, Map JavaDoc classnames) {
68         return new SignatureAttribute(newCp, getSignature());
69     }
70 }
71
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