1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21package proguard.classfile.util; 22 23import proguard.classfile.ClassConstants; 24 25 26/** 27 * An <code>ExternalTypeEnumeration</code> provides an enumeration of all 28 * types listed in a given external descriptor string. The method name can 29 * be retrieved separately. 30 * <p> 31 * A <code>ExternalTypeEnumeration</code> object can be reused for processing 32 * different subsequent descriptors, by means of the <code>setDescriptor</code> 33 * method. 34 * 35 * @author Eric Lafortune 36 */ 37public class ExternalTypeEnumeration 38{ 39 private String descriptor; 40 private int index; 41 42 43 public ExternalTypeEnumeration(String descriptor) 44 { 45 setDescriptor(descriptor); 46 } 47 48 49 ExternalTypeEnumeration() 50 { 51 } 52 53 54 void setDescriptor(String descriptor) 55 { 56 this.descriptor = descriptor; 57 58 reset(); 59 } 60 61 62 public void reset() 63 { 64 index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN) + 1; 65 66 if (index < 1) 67 { 68 throw new IllegalArgumentException("Missing opening parenthesis in descriptor ["+descriptor+"]"); 69 } 70 } 71 72 73 public boolean hasMoreTypes() 74 { 75 return index < descriptor.length() - 1; 76 } 77 78 79 public String nextType() 80 { 81 int startIndex = index; 82 83 // Find the next separating comma. 84 index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_SEPARATOR, 85 startIndex); 86 87 // Otherwise find the closing parenthesis. 88 if (index < 0) 89 { 90 index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_CLOSE, 91 startIndex); 92 if (index < 0) 93 { 94 throw new IllegalArgumentException("Missing closing parenthesis in descriptor ["+descriptor+"]"); 95 } 96 } 97 98 return descriptor.substring(startIndex, index++).trim(); 99 } 100 101 102 public String methodName() 103 { 104 return descriptor.substring(0, descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN)).trim(); 105 } 106} 107