| /******************************************************************************* |
| * Copyright (c) 2004, 2012 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdi.internal; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * Utility class to perform operations on generic signatures |
| */ |
| public class GenericSignature { |
| |
| private static final char C_CLASS_TYPE = 'L'; |
| private static final char C_TYPE_VARIABLE = 'T'; |
| private static final char C_ARRAY = '['; |
| private static final char C_WILDCARD_PLUS = '+'; |
| private static final char C_WILDCARD_MINUS = '-'; |
| |
| private static final char C_TYPE_END = ';'; |
| private static final char C_PARAMETERS_START = '('; |
| private static final char C_PARAMETERS_END = ')'; |
| private static final char C_TYPE_ARGUMENTS_START = '<'; |
| private static final char C_TYPE_ARGUMENTS_END = '>'; |
| |
| public static List<String> getParameterTypes(String methodSignature) { |
| int parameterStart = methodSignature.indexOf(C_PARAMETERS_START); |
| int parametersEnd = methodSignature.lastIndexOf(C_PARAMETERS_END); |
| if (parameterStart == -1 || parametersEnd == -1) { |
| // used to throw illegal argument exception, but now return empty |
| // list if we can't parse it |
| return Collections.EMPTY_LIST; |
| } |
| return getTypeSignatureList(methodSignature.substring(parameterStart + 1, parametersEnd)); |
| } |
| |
| private static List<String> getTypeSignatureList(String typeSignatureList) { |
| List<String> list = new ArrayList<>(); |
| int pos = 0; |
| while (pos < typeSignatureList.length()) { |
| int signatureLength = nextTypeSignatureLength(typeSignatureList, pos); |
| list.add(typeSignatureList.substring(pos, pos += signatureLength)); |
| } |
| return list; |
| } |
| |
| private static int nextTypeSignatureLength(String signature, int startPos) { |
| int inclusionLevel = 0; |
| for (int i = startPos, length = signature.length(); i < length; i++) { |
| if (inclusionLevel == 0) { |
| switch (signature.charAt(i)) { |
| case C_CLASS_TYPE: |
| case C_TYPE_VARIABLE: |
| case C_WILDCARD_PLUS: |
| case C_WILDCARD_MINUS: |
| inclusionLevel = 1; |
| break; |
| case C_ARRAY: |
| break; |
| default: |
| return i - startPos + 1; |
| } |
| } else { |
| switch (signature.charAt(i)) { |
| case C_TYPE_END: |
| if (inclusionLevel == 1) { |
| return i - startPos + 1; |
| } |
| break; |
| case C_TYPE_ARGUMENTS_START: |
| inclusionLevel++; |
| break; |
| case C_TYPE_ARGUMENTS_END: |
| inclusionLevel--; |
| break; |
| } |
| } |
| } |
| throw new IllegalArgumentException(); |
| } |
| } |