001/* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2012 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * Sonar is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * Sonar is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with Sonar; if not, write to the Free Software 018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 019 */ 020package org.sonar.java.signature; 021 022import java.util.ArrayList; 023import java.util.List; 024 025public final class ParameterSignatureScanner { 026 027 private final String signature; 028 private int index = 0; 029 030 private static final char ARRAY = '['; 031 032 private ParameterSignatureScanner(String parametersSignature) { 033 this.signature = parametersSignature; 034 } 035 036 public static Parameter scan(String parameterSignature) { 037 ParameterSignatureScanner scanner = new ParameterSignatureScanner(parameterSignature); 038 if (scanner.hasNext()) { 039 return scanner.next(); 040 } else { 041 return null; 042 } 043 } 044 045 public static List<Parameter> scanArguments(String argumentsSignature) { 046 List<Parameter> arguments = new ArrayList<Parameter>(); 047 048 ParameterSignatureScanner scanner = new ParameterSignatureScanner(argumentsSignature); 049 while (scanner.hasNext()) { 050 arguments.add(scanner.next()); 051 } 052 053 return arguments; 054 } 055 056 private boolean hasNext() { 057 if (signature.length() > index && (signature.charAt(index) == ARRAY || nextCharIsJvmJavaType())) { 058 return true; 059 } 060 return false; 061 } 062 063 private boolean nextCharIsJvmJavaType() { 064 try { 065 JvmJavaType.valueOf(signature.substring(index, index + 1)); 066 return true; 067 } catch (IllegalArgumentException e) { 068 return false; 069 } 070 } 071 072 private Parameter next() { 073 boolean isArray = false; 074 String classCanonicalName = null; 075 076 while (signature.charAt(index) == ARRAY) { 077 isArray = true; 078 index++; 079 } 080 081 JvmJavaType jvmJavaType = JvmJavaType.valueOf(signature.substring(index, index + 1)); 082 index = index + 1; 083 084 if (jvmJavaType == JvmJavaType.L || jvmJavaType == JvmJavaType.T) { 085 int semicolonIndex = searchEndOfParameterSignature(signature, index); 086 int inferiorCharIndex = signature.indexOf('<', index); 087 if (inferiorCharIndex != -1 && inferiorCharIndex < semicolonIndex) { 088 classCanonicalName = signature.substring(index, signature.indexOf('<', index)); 089 } else { 090 classCanonicalName = signature.substring(index, semicolonIndex); 091 } 092 index = semicolonIndex + 1; 093 jvmJavaType = JvmJavaType.L; 094 } 095 return new Parameter(jvmJavaType, classCanonicalName, isArray); 096 } 097 098 private int searchEndOfParameterSignature(String signature, int index) { 099 int genericDefinitionStack = 0; 100 for (; index < signature.length(); index++) { 101 char character = signature.charAt(index); 102 if (character == ';' && genericDefinitionStack == 0) { 103 return index; 104 } 105 if (character == '<') { 106 genericDefinitionStack++; 107 } else if (character == '>') { 108 genericDefinitionStack--; 109 } 110 } 111 throw new IllegalStateException("Unable to extract parameter signature from '" + signature + "'"); 112 } 113}