1 cananian 1.1.2.2 // ConstantNameAndType.java, created Mon Jan 18 22:44:37 1999 by cananian
2 cananian 1.1.2.1 // Copyright (C) 1998 C. Scott Ananian <cananian@alumni.princeton.edu>
3 cananian 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.2.1 package harpoon.IR.RawClass;
5 cananian 1.1.2.1
6 cananian 1.1.2.1 /**
7 cananian 1.1.2.1 * The <code>CONSTANT_NameAndType_info</code> structure is used to
8 cananian 1.1.2.1 * represent a field or method, without indicating which class or
9 cananian 1.1.2.1 * interface type it belongs to.
10 cananian 1.1.2.1 *
11 cananian 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
12 cananian 1.2 * @version $Id: ConstantNameAndType.java,v 1.2 2002/02/25 21:05:27 cananian Exp $
13 cananian 1.1.2.1 * @see "The Java Virtual Machine Specification, section 4.4.6"
14 cananian 1.1.2.1 * @see Constant
15 cananian 1.1.2.1 */
16 cananian 1.1.2.1 public class ConstantNameAndType extends Constant {
17 cananian 1.1.2.1 /** The value of the <code>name_index</code> must be a valid index
18 cananian 1.1.2.1 into the <code>constant_pool</code> table. The
19 cananian 1.1.2.1 <code>constant_pool</code> entry at that index must be a
20 cananian 1.1.2.1 <code>CONSTANT_Utf8_info</code> structure representing a valid
21 cananian 1.1.2.1 Java field name or method name stored as a simple (not fully
22 cananian 1.1.2.1 qualified) name, that is, as a Java identifier. */
23 cananian 1.1.2.1 public int name_index;
24 cananian 1.1.2.1 /** the value of the <code>descriptor_index</code> must be a valid
25 cananian 1.1.2.1 index into the <code>constant_pool</code> table. The
26 cananian 1.1.2.1 <code>constant_pool</code> entry at that index must be a
27 cananian 1.1.2.1 <code>CONSTANT_Utf8_info</code> structure representing a valid
28 cananian 1.1.2.1 Java field descriptor or method descriptor. */
29 cananian 1.1.2.1 public int descriptor_index;
30 cananian 1.1.2.1
31 cananian 1.1.2.1 /** Constructor. */
32 cananian 1.1.2.1 ConstantNameAndType(ClassFile parent, ClassDataInputStream in)
33 cananian 1.1.2.1 throws java.io.IOException {
34 cananian 1.1.2.1 super(parent);
35 cananian 1.1.2.1 name_index = in.read_u2();
36 cananian 1.1.2.1 descriptor_index = in.read_u2();
37 cananian 1.1.2.1 }
38 cananian 1.1.2.1 /** Constructor. */
39 cananian 1.1.2.1 public ConstantNameAndType(ClassFile parent,
40 cananian 1.1.2.1 int name_index, int descriptor_index) {
41 cananian 1.1.2.1 super(parent);
42 cananian 1.1.2.1 this.name_index = name_index;
43 cananian 1.1.2.1 this.descriptor_index = descriptor_index;
44 cananian 1.1.2.1 }
45 cananian 1.1.2.1
46 cananian 1.1.2.1 /** Write to a bytecode file. */
47 cananian 1.1.2.1 public void write(ClassDataOutputStream out) throws java.io.IOException {
48 cananian 1.1.2.1 out.write_u1(CONSTANT_NameAndType);
49 cananian 1.1.2.1 out.write_u2(name_index);
50 cananian 1.1.2.1 out.write_u2(descriptor_index);
51 cananian 1.1.2.1 }
52 cananian 1.1.2.1
53 cananian 1.1.2.1 // convenience.
54 cananian 1.1.2.1 public ConstantUtf8 name_index()
55 cananian 1.1.2.1 { return (ConstantUtf8) parent.constant_pool[name_index]; }
56 cananian 1.1.2.1 public ConstantUtf8 descriptor_index()
57 cananian 1.1.2.1 { return (ConstantUtf8) parent.constant_pool[descriptor_index]; }
58 cananian 1.1.2.1
59 cananian 1.1.2.1 public String name() { return name_index().val; }
60 cananian 1.1.2.1 public String descriptor() { return descriptor_index().val; }
61 cananian 1.1.2.1
62 cananian 1.1.2.1 /** Create a human-readable representation of this constant. */
63 cananian 1.1.2.1 public String toString() {
64 cananian 1.1.2.1 return "CONSTANT_NameAndType: " +
65 cananian 1.1.2.1 name()+" {"+name_index+"} " +
66 cananian 1.1.2.1 descriptor()+" {"+descriptor_index+"}";
67 cananian 1.1.2.1 }
68 cananian 1.2 }