1 /*
2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.reflect;
27
28 import java.lang.reflect.*;
29
30 /** Provides reflective access to the constant pools of classes.
31 Currently this is needed to provide reflective access to annotations
32 but may be used by other internal subsystems in the future. */
33
34 public class ConstantPool {
35 // Number of entries in this constant pool (= maximum valid constant pool index)
36 public int getSize() { return getSize0 (constantPoolOop); }
37 public Class<?> getClassAt (int index) { return getClassAt0 (constantPoolOop, index); }
38 public Class<?> getClassAtIfLoaded (int index) { return getClassAtIfLoaded0 (constantPoolOop, index); }
39 // Returns either a Method or Constructor.
40 // Static initializers are returned as Method objects.
41 public Member getMethodAt (int index) { return getMethodAt0 (constantPoolOop, index); }
42 public Member getMethodAtIfLoaded(int index) { return getMethodAtIfLoaded0(constantPoolOop, index); }
43 public Field getFieldAt (int index) { return getFieldAt0 (constantPoolOop, index); }
44 public Field getFieldAtIfLoaded (int index) { return getFieldAtIfLoaded0 (constantPoolOop, index); }
45 // Fetches the class name, member (field, method or interface
46 // method) name, and type descriptor as an array of three Strings
47 public String[] getMemberRefInfoAt (int index) { return getMemberRefInfoAt0 (constantPoolOop, index); }
48 public int getIntAt (int index) { return getIntAt0 (constantPoolOop, index); }
49 public long getLongAt (int index) { return getLongAt0 (constantPoolOop, index); }
50 public float getFloatAt (int index) { return getFloatAt0 (constantPoolOop, index); }
51 public double getDoubleAt (int index) { return getDoubleAt0 (constantPoolOop, index); }
52 public String getStringAt (int index) { return getStringAt0 (constantPoolOop, index); }
53 public String getUTF8At (int index) { return getUTF8At0 (constantPoolOop, index); }
54
55 //---------------------------------------------------------------------------
56 // Internals only below this point
57 //
58
59 static {
60 Reflection.registerFieldsToFilter(ConstantPool.class, new String[] { "constantPoolOop" });
61 }
62
63 // HotSpot-internal constant pool object (set by the VM, name known to the VM)
64 private Object constantPoolOop;
65
66 private native int getSize0 (Object constantPoolOop);
67 private native Class<?> getClassAt0 (Object constantPoolOop, int index);
68 private native Class<?> getClassAtIfLoaded0 (Object constantPoolOop, int index);
69 private native Member getMethodAt0 (Object constantPoolOop, int index);
70 private native Member getMethodAtIfLoaded0(Object constantPoolOop, int index);
71 private native Field getFieldAt0 (Object constantPoolOop, int index);
72 private native Field getFieldAtIfLoaded0 (Object constantPoolOop, int index);
73 private native String[] getMemberRefInfoAt0 (Object constantPoolOop, int index);
74 private native int getIntAt0 (Object constantPoolOop, int index);
75 private native long getLongAt0 (Object constantPoolOop, int index);
76 private native float getFloatAt0 (Object constantPoolOop, int index);
77 private native double getDoubleAt0 (Object constantPoolOop, int index);
78 private native String getStringAt0 (Object constantPoolOop, int index);
79 private native String getUTF8At0 (Object constantPoolOop, int index);
80 }