1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.bcel.internal.classfile; 23 24 25import com.sun.org.apache.bcel.internal.Constants; 26import java.io.*; 27 28/** 29 * This class is derived from <em>Attribute</em> and represents a reference 30 * to a <href="http://wwwipd.ira.uka.de/~pizza/gj/">GJ</a> attribute. 31 * 32 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 33 * @see Attribute 34 */ 35public final class Signature extends Attribute { 36 private int signature_index; 37 38 /** 39 * Initialize from another object. Note that both objects use the same 40 * references (shallow copy). Use clone() for a physical copy. 41 */ 42 public Signature(Signature c) { 43 this(c.getNameIndex(), c.getLength(), c.getSignatureIndex(), c.getConstantPool()); 44 } 45 46 /** 47 * Construct object from file stream. 48 * @param name_index Index in constant pool to CONSTANT_Utf8 49 * @param length Content length in bytes 50 * @param file Input stream 51 * @param constant_pool Array of constants 52 * @throws IOException 53 */ 54 Signature(int name_index, int length, DataInputStream file, 55 ConstantPool constant_pool) throws IOException 56 { 57 this(name_index, length, file.readUnsignedShort(), constant_pool); 58 } 59 60 /** 61 * @param name_index Index in constant pool to CONSTANT_Utf8 62 * @param length Content length in bytes 63 * @param constant_pool Array of constants 64 * @param Signature_index Index in constant pool to CONSTANT_Utf8 65 */ 66 public Signature(int name_index, int length, int signature_index, 67 ConstantPool constant_pool) 68 { 69 super(Constants.ATTR_SIGNATURE, name_index, length, constant_pool); 70 this.signature_index = signature_index; 71 } 72 73 /** 74 * Called by objects that are traversing the nodes of the tree implicitely 75 * defined by the contents of a Java class. I.e., the hierarchy of methods, 76 * fields, attributes, etc. spawns a tree of objects. 77 * 78 * @param v Visitor object 79 */ 80 public void accept(Visitor v) { 81 System.err.println("Visiting non-standard Signature object"); 82 v.visitSignature(this); 83 } 84 85 /** 86 * Dump source file attribute to file stream in binary format. 87 * 88 * @param file Output file stream 89 * @throws IOException 90 */ 91 public final void dump(DataOutputStream file) throws IOException 92 { 93 super.dump(file); 94 file.writeShort(signature_index); 95 } 96 97 /** 98 * @return Index in constant pool of source file name. 99 */ 100 public final int getSignatureIndex() { return signature_index; } 101 102 /** 103 * @param Signature_index. 104 */ 105 public final void setSignatureIndex(int signature_index) { 106 this.signature_index = signature_index; 107 } 108 109 /** 110 * @return GJ signature. 111 */ 112 public final String getSignature() { 113 ConstantUtf8 c = (ConstantUtf8)constant_pool.getConstant(signature_index, 114 Constants.CONSTANT_Utf8); 115 return c.getBytes(); 116 } 117 118 /** 119 * Extends ByteArrayInputStream to make 'unreading' chars possible. 120 */ 121 private static final class MyByteArrayInputStream extends ByteArrayInputStream { 122 MyByteArrayInputStream(String data) { super(data.getBytes()); } 123 final int mark() { return pos; } 124 final String getData() { return new String(buf); } 125 final void reset(int p) { pos = p; } 126 final void unread() { if(pos > 0) pos--; } 127 } 128 129 private static boolean identStart(int ch) { 130 return ch == 'T' || ch == 'L'; 131 } 132 133 private static boolean identPart(int ch) { 134 return ch == '/' || ch == ';'; 135 } 136 137 private static final void matchIdent(MyByteArrayInputStream in, StringBuffer buf) { 138 int ch; 139 140 if((ch = in.read()) == -1) 141 throw new RuntimeException("Illegal signature: " + in.getData() + 142 " no ident, reaching EOF"); 143 144 //System.out.println("return from ident:" + (char)ch); 145 146 if(!identStart(ch)) { 147 StringBuffer buf2 = new StringBuffer(); 148 149 int count = 1; 150 while(Character.isJavaIdentifierPart((char)ch)) { 151 buf2.append((char)ch); 152 count++; 153 ch = in.read(); 154 } 155 156 if(ch == ':') { // Ok, formal parameter 157 in.skip("Ljava/lang/Object".length()); 158 buf.append(buf2); 159 160 ch = in.read(); 161 in.unread(); 162 //System.out.println("so far:" + buf2 + ":next:" +(char)ch); 163 } else { 164 for(int i=0; i < count; i++) 165 in.unread(); 166 } 167 168 return; 169 } 170 171 StringBuffer buf2 = new StringBuffer(); 172 ch = in.read(); 173 174 do { 175 buf2.append((char)ch); 176 ch = in.read(); 177 //System.out.println("within ident:"+ (char)ch); 178 179 } while((ch != -1) && (Character.isJavaIdentifierPart((char)ch) || (ch == '/'))); 180 181 buf.append(buf2.toString().replace('/', '.')); 182 183 //System.out.println("regular return ident:"+ (char)ch + ":" + buf2); 184 185 if(ch != -1) 186 in.unread(); 187 } 188 189 private static final void matchGJIdent(MyByteArrayInputStream in, 190 StringBuffer buf) 191 { 192 int ch; 193 194 matchIdent(in, buf); 195 196 ch = in.read(); 197 if((ch == '<') || ch == '(') { // Parameterized or method 198 //System.out.println("Enter <"); 199 buf.append((char)ch); 200 matchGJIdent(in, buf); 201 202 while(((ch = in.read()) != '>') && (ch != ')')) { // List of parameters 203 if(ch == -1) 204 throw new RuntimeException("Illegal signature: " + in.getData() + 205 " reaching EOF"); 206 207 //System.out.println("Still no >"); 208 buf.append(", "); 209 in.unread(); 210 matchGJIdent(in, buf); // Recursive call 211 } 212 213 //System.out.println("Exit >"); 214 215 buf.append((char)ch); 216 } else 217 in.unread(); 218 219 ch = in.read(); 220 if(identStart(ch)) { 221 in.unread(); 222 matchGJIdent(in, buf); 223 } else if(ch == ')') { 224 in.unread(); 225 return; 226 } else if(ch != ';') 227 throw new RuntimeException("Illegal signature: " + in.getData() + " read " + 228 (char)ch); 229 } 230 231 public static String translate(String s) { 232 //System.out.println("Sig:" + s); 233 StringBuffer buf = new StringBuffer(); 234 235 matchGJIdent(new MyByteArrayInputStream(s), buf); 236 237 return buf.toString(); 238 } 239 240 public static final boolean isFormalParameterList(String s) { 241 return s.startsWith("<") && (s.indexOf(':') > 0); 242 } 243 244 public static final boolean isActualParameterList(String s) { 245 return s.startsWith("L") && s.endsWith(">;"); 246 } 247 248 /** 249 * @return String representation 250 */ 251 public final String toString() { 252 String s = getSignature(); 253 254 return "Signature(" + s + ")"; 255 } 256 257 /** 258 * @return deep copy of this attribute 259 */ 260 public Attribute copy(ConstantPool constant_pool) { 261 return (Signature)clone(); 262 } 263} 264