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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2004, 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 | } | ||