| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.services.classfile.CONSTANT_Index_info |
| 4 | |
| 5 | Copyright 2000, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.iapi.services.classfile; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.classfile.VMDescriptor; |
| 24 | |
| 25 | import java.io.IOException; |
| 26 | |
| 27 | /** |
| 28 | |
| 29 | A generic constant pool entry for entries that simply hold indexes |
| 30 | into other entries. |
| 31 | |
| 32 | <BR> |
| 33 | Ref Constant Pool Entry - page 94 - Section 4.4.2 - Two indexes |
| 34 | <BR> |
| 35 | NameAndType Constant Pool Entry - page 99 - Section 4.4.6 - Two indexes |
| 36 | <BR> |
| 37 | String Constant Pool Entry - page 96 - Section 4.4.3 - One index |
| 38 | <BR> |
| 39 | Class Reference Constant Pool Entry - page 93 - Section 4.4.1 - One index |
| 40 | |
| 41 | */ |
| 42 | public final class CONSTANT_Index_info extends ConstantPoolEntry { |
| 43 | |
| 44 | private int i1; |
| 45 | private int i2; |
| 46 | |
| 47 | CONSTANT_Index_info(int tag, int i1, int i2) { |
| 48 | super(tag); |
| 49 | this.i1 = i1; |
| 50 | this.i2 = i2; |
| 51 | } |
| 52 | |
| 53 | public int hashCode() { |
| 54 | return (tag << 16) | ((i1 << 8) ^ i2); |
| 55 | } |
| 56 | |
| 57 | public boolean equals(Object other) { |
| 58 | if (other instanceof CONSTANT_Index_info) { |
| 59 | CONSTANT_Index_info o = (CONSTANT_Index_info) other; |
| 60 | |
| 61 | return (tag == o.tag) && (i1 == o.i1) && (i2 == o.i2); |
| 62 | } |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | |
| 67 | /** |
| 68 | Used when searching |
| 69 | */ |
| 70 | void set(int tag, int i1, int i2) { |
| 71 | this.tag = tag; |
| 72 | this.i1 = i1; |
| 73 | this.i2 = i2; |
| 74 | } |
| 75 | |
| 76 | int classFileSize() { |
| 77 | // 1 (tag) + 2 (index length) [ + 2 (index length) ] |
| 78 | return 1 + 2 + ((i2 != 0) ? 2 : 0); |
| 79 | } |
| 80 | |
| 81 | void put(ClassFormatOutput out) throws IOException { |
| 82 | super.put(out); |
| 83 | out.putU2(i1); |
| 84 | if (i2 != 0) |
| 85 | out.putU2(i2); |
| 86 | } |
| 87 | |
| 88 | public int getI1() { return i1; } |
| 89 | |
| 90 | public int getI2() { return i2; } |
| 91 | } |