1 /* 2 * Copyright (c) 2001, 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 /** Assists in iterating down a method's signature */ 29 30 public class SignatureIterator { 31 private String sig; 32 private int idx; 33 34 public SignatureIterator(String sig) { 35 this.sig = sig; 36 reset(); 37 } 38 39 public void reset() { 40 idx = 1; 41 } 42 43 public boolean atEnd() { 44 return sig.charAt(idx) == ')'; 45 } 46 47 public String next() { 48 if (atEnd()) return null; 49 char c = sig.charAt(idx); 50 if (c != '[' && c != 'L') { 51 ++idx; 52 return new String(new char[] { c }); 53 } 54 // Walk forward to end of entry 55 int endIdx = idx; 56 if (c == '[') { 57 while ((c = sig.charAt(endIdx)) == '[') { 58 endIdx++; 59 } 60 } 61 62 if (c == 'L') { 63 while (sig.charAt(endIdx) != ';') { 64 endIdx++; 65 } 66 } 67 68 int beginIdx = idx; 69 idx = endIdx + 1; 70 return sig.substring(beginIdx, idx); 71 } 72 73 /** Should only be called when atEnd() is true. Does not change 74 state of iterator. */ 75 public String returnType() { 76 if (!atEnd()) { 77 throw new InternalError("Illegal use of SignatureIterator"); 78 } 79 return sig.substring(idx + 1, sig.length()); 80 } 81 }