| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.services.classfile.MemberTable |
| 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 java.io.IOException; |
| 24 | |
| 25 | import java.util.Hashtable; |
| 26 | import java.util.Vector; |
| 27 | |
| 28 | |
| 29 | |
| 30 | class MemberTable { |
| 31 | protected Vector entries; |
| 32 | private Hashtable hashtable; |
| 33 | private MemberTableHash mutableMTH = null; |
| 34 | |
| 35 | public MemberTable(int count) { |
| 36 | entries = new Vector(count); |
| 37 | hashtable = new Hashtable((count > 50) ? count : 50); |
| 38 | mutableMTH = new MemberTableHash(null, null); |
| 39 | } |
| 40 | |
| 41 | void addEntry(ClassMember item) { |
| 42 | MemberTableHash mth= new MemberTableHash( |
| 43 | item.getName(), |
| 44 | item.getDescriptor(), |
| 45 | entries.size()); |
| 46 | /* Add to the Vector */ |
| 47 | entries.addElement(item); |
| 48 | |
| 49 | /* Add to the Hashtable */ |
| 50 | hashtable.put(mth, mth); |
| 51 | } |
| 52 | |
| 53 | ClassMember find(String name, String descriptor) { |
| 54 | |
| 55 | /* Set up the mutable MTH for the search */ |
| 56 | mutableMTH.name = name; |
| 57 | mutableMTH.descriptor = descriptor; |
| 58 | mutableMTH.setHashCode(); |
| 59 | |
| 60 | /* search the hash table */ |
| 61 | MemberTableHash mth = (MemberTableHash) hashtable.get(mutableMTH); |
| 62 | if (mth == null) |
| 63 | { |
| 64 | return null; |
| 65 | } |
| 66 | |
| 67 | return (ClassMember) entries.elementAt(mth.index); |
| 68 | } |
| 69 | |
| 70 | void put(ClassFormatOutput out) throws IOException { |
| 71 | |
| 72 | Vector lentries = entries; |
| 73 | int count = lentries.size(); |
| 74 | for (int i = 0; i < count; i++) { |
| 75 | ((ClassMember) lentries.elementAt(i)).put(out); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | int size() { |
| 80 | return entries.size(); |
| 81 | } |
| 82 | |
| 83 | int classFileSize() { |
| 84 | int size = 0; |
| 85 | |
| 86 | Vector lentries = entries; |
| 87 | int count = lentries.size(); |
| 88 | for (int i = 0; i < count; i++) { |
| 89 | size += ((ClassMember) lentries.elementAt(i)).classFileSize(); |
| 90 | } |
| 91 | |
| 92 | return size; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | class MemberTableHash |
| 97 | { |
| 98 | String name; |
| 99 | String descriptor; |
| 100 | int index; |
| 101 | int hashCode; |
| 102 | |
| 103 | MemberTableHash(String name, String descriptor, int index) |
| 104 | { |
| 105 | this.name = name; |
| 106 | this.descriptor = descriptor; |
| 107 | this.index = index; |
| 108 | /* Only set hashCode if both name and descriptor are non-null */ |
| 109 | if (name != null && descriptor != null) |
| 110 | { |
| 111 | setHashCode(); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | MemberTableHash(String name, String descriptor) |
| 116 | { |
| 117 | this(name, descriptor, -1); |
| 118 | } |
| 119 | |
| 120 | void setHashCode() |
| 121 | { |
| 122 | hashCode = name.hashCode() + descriptor.hashCode(); |
| 123 | } |
| 124 | |
| 125 | public boolean equals(Object other) |
| 126 | { |
| 127 | MemberTableHash mth = (MemberTableHash) other; |
| 128 | |
| 129 | if (other == null) |
| 130 | { |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | if (name.equals(mth.name) && descriptor.equals(mth.descriptor)) |
| 135 | { |
| 136 | return true; |
| 137 | } |
| 138 | else |
| 139 | { |
| 140 | return false; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | public int hashCode() |
| 145 | { |
| 146 | return hashCode; |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | |
| 151 | |
| 152 | |
| 153 | |
| 154 | |