| /* |
| * Copyright (c) 2007, 2013, 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.classfile; |
| |
| import java.io.IOException; |
| |
| /** |
| * See JVMS, section 4.4. |
| * |
| * <p><b>This is NOT part of any supported API. |
| * If you write code that depends on this, you do so at your own risk. |
| * This code and its internal interfaces are subject to change or |
| * deletion without notice.</b> |
| */ |
| public class Descriptor { |
| public static class InvalidDescriptor extends DescriptorException { |
| private static final long serialVersionUID = 1L; |
| InvalidDescriptor(String desc) { |
| this.desc = desc; |
| this.index = -1; |
| } |
| |
| InvalidDescriptor(String desc, int index) { |
| this.desc = desc; |
| this.index = index; |
| } |
| |
| @Override |
| public String getMessage() { |
| // i18n |
| if (index == -1) |
| return "invalid descriptor \"" + desc + "\""; |
| else |
| return "descriptor is invalid at offset " + index + " in \"" + desc + "\""; |
| } |
| |
| public final String desc; |
| public final int index; |
| |
| } |
| |
| public Descriptor(ClassReader cr) throws IOException { |
| this(cr.readUnsignedShort()); |
| } |
| |
| public Descriptor(int index) { |
| this.index = index; |
| |
| } |
| |
| public String getValue(ConstantPool constant_pool) throws ConstantPoolException { |
| return constant_pool.getUTF8Value(index); |
| } |
| |
| public int getParameterCount(ConstantPool constant_pool) |
| throws ConstantPoolException, InvalidDescriptor { |
| String desc = getValue(constant_pool); |
| int end = desc.indexOf(")"); |
| if (end == -1) |
| throw new InvalidDescriptor(desc); |
| parse(desc, 0, end + 1); |
| return count; |
| |
| } |
| |
| public String getParameterTypes(ConstantPool constant_pool) |
| throws ConstantPoolException, InvalidDescriptor { |
| String desc = getValue(constant_pool); |
| int end = desc.indexOf(")"); |
| if (end == -1) |
| throw new InvalidDescriptor(desc); |
| return parse(desc, 0, end + 1); |
| } |
| |
| public String getReturnType(ConstantPool constant_pool) |
| throws ConstantPoolException, InvalidDescriptor { |
| String desc = getValue(constant_pool); |
| int end = desc.indexOf(")"); |
| if (end == -1) |
| throw new InvalidDescriptor(desc); |
| return parse(desc, end + 1, desc.length()); |
| } |
| |
| public String getFieldType(ConstantPool constant_pool) |
| throws ConstantPoolException, InvalidDescriptor { |
| String desc = getValue(constant_pool); |
| return parse(desc, 0, desc.length()); |
| } |
| |
| private String parse(String desc, int start, int end) |
| throws InvalidDescriptor { |
| int p = start; |
| StringBuilder sb = new StringBuilder(); |
| int dims = 0; |
| count = 0; |
| |
| while (p < end) { |
| String type; |
| char ch; |
| switch (ch = desc.charAt(p++)) { |
| case '(': |
| sb.append('('); |
| continue; |
| |
| case ')': |
| sb.append(')'); |
| continue; |
| |
| case '[': |
| dims++; |
| continue; |
| |
| case 'B': |
| type = "byte"; |
| break; |
| |
| case 'C': |
| type = "char"; |
| break; |
| |
| case 'D': |
| type = "double"; |
| break; |
| |
| case 'F': |
| type = "float"; |
| break; |
| |
| case 'I': |
| type = "int"; |
| break; |
| |
| case 'J': |
| type = "long"; |
| break; |
| |
| case 'L': |
| int sep = desc.indexOf(';', p); |
| if (sep == -1) |
| throw new InvalidDescriptor(desc, p - 1); |
| type = desc.substring(p, sep).replace('/', '.'); |
| p = sep + 1; |
| break; |
| |
| case 'S': |
| type = "short"; |
| break; |
| |
| case 'Z': |
| type = "boolean"; |
| break; |
| |
| case 'V': |
| type = "void"; |
| break; |
| |
| default: |
| throw new InvalidDescriptor(desc, p - 1); |
| } |
| |
| if (sb.length() > 1 && sb.charAt(0) == '(') |
| sb.append(", "); |
| sb.append(type); |
| for ( ; dims > 0; dims-- ) |
| sb.append("[]"); |
| |
| count++; |
| } |
| |
| return sb.toString(); |
| } |
| |
| public final int index; |
| private int count; |
| } |