| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.tools.jdeprscan.scan; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Represents a method's signature, that is, its parameter types |
| * and its return type. |
| */ |
| public class MethodSig { |
| final List<String> parameters; |
| final String returnType; |
| |
| /** |
| * Parses the method descriptor and returns a MethodSig instance. |
| * |
| * @param desc the descriptor to parse |
| * @return the new MethodSig instance |
| */ |
| public static MethodSig fromDesc(String desc) { |
| return parse(desc, 0, desc.length()); |
| } |
| |
| /** |
| * Returns this method's return type. |
| * |
| * @return the return type |
| */ |
| public String getReturnType() { |
| return returnType; |
| } |
| |
| /** |
| * Returns a list of parameters of this method. |
| * |
| * @return the parameter list |
| */ |
| public List<String> getParameters() { |
| return parameters; |
| } |
| |
| /** |
| * Returns a string describing this method. |
| * |
| * @return the string description |
| */ |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("parameters"); |
| if (parameters.isEmpty()) { |
| sb.append(" none"); |
| } else { |
| int i = 0; |
| for (String p : parameters) { |
| sb.append(String.format(" %d=%s", i++, p)); |
| } |
| } |
| sb.append(String.format(" return %s", returnType)); |
| return sb.toString(); |
| } |
| |
| private MethodSig(List<String> parameters, String returnType) { |
| this.parameters = Collections.unmodifiableList(parameters); |
| this.returnType = returnType; |
| } |
| |
| private static IllegalArgumentException ex(String desc, int pos) { |
| return new IllegalArgumentException(String.format( |
| "illegal descriptor \"%s\" at position %d", desc, pos)); |
| } |
| |
| private static MethodSig parse(String desc, int start, int end) |
| throws IllegalArgumentException { |
| int p = start; |
| int dims = 0; |
| boolean inReturnType = false; |
| String returnType = null; |
| List<String> parameters = new ArrayList<>(); |
| |
| while (p < end) { |
| String type; |
| char ch; |
| switch (ch = desc.charAt(p)) { |
| case '(': |
| p++; |
| continue; |
| |
| case ')': |
| p++; |
| inReturnType = true; |
| continue; |
| |
| case '[': |
| p++; |
| dims++; |
| continue; |
| |
| case 'B': // byte |
| case 'C': // char |
| case 'D': // double |
| case 'F': // float |
| case 'I': // int |
| case 'J': // long |
| case 'S': // short |
| case 'Z': // boolean |
| case 'V': // void |
| type = Character.toString(ch); |
| p++; |
| break; |
| |
| case 'L': |
| int sep = desc.indexOf(';', p); |
| if (sep == -1 || sep >= end) |
| throw ex(desc, p); |
| type = desc.substring(p, ++sep); |
| p = sep; |
| break; |
| |
| default: |
| throw ex(desc, p); |
| } |
| |
| StringBuilder sb = new StringBuilder(); |
| for ( ; dims > 0; dims-- ) |
| sb.append("["); |
| sb.append(type); |
| if (inReturnType) { |
| returnType = sb.toString(); |
| } else { |
| parameters.add(sb.toString()); |
| } |
| } |
| |
| if (returnType == null) { |
| throw ex(desc, end); |
| } |
| |
| return new MethodSig(parameters, returnType); |
| } |
| } |