1 /* |
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2 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 |
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27 package com.sun.tools.classfile; |
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28 |
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29 import java.io.IOException; |
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30 |
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31 /** |
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32 * See JVMS, section 4.4. |
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33 * |
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34 * <p><b>This is NOT part of any supported API. |
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35 * If you write code that depends on this, you do so at your own risk. |
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36 * This code and its internal interfaces are subject to change or |
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37 * deletion without notice.</b> |
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38 */ |
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39 public class Descriptor { |
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40 public static class InvalidDescriptor extends DescriptorException { |
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41 private static final long serialVersionUID = 1L; |
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42 InvalidDescriptor(String desc) { |
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43 this.desc = desc; |
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44 this.index = -1; |
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45 } |
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46 |
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47 InvalidDescriptor(String desc, int index) { |
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48 this.desc = desc; |
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49 this.index = index; |
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50 } |
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51 |
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52 @Override |
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53 public String getMessage() { |
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54 // i18n |
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55 if (index == -1) |
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56 return "invalid descriptor \"" + desc + "\""; |
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57 else |
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58 return "descriptor is invalid at offset " + index + " in \"" + desc + "\""; |
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59 } |
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60 |
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61 public final String desc; |
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62 public final int index; |
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63 |
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64 } |
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65 |
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66 public Descriptor(ClassReader cr) throws IOException { |
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67 this(cr.readUnsignedShort()); |
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68 } |
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69 |
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70 public Descriptor(int index) { |
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71 this.index = index; |
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72 |
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73 } |
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74 |
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75 public String getValue(ConstantPool constant_pool) throws ConstantPoolException { |
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76 return constant_pool.getUTF8Value(index); |
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77 } |
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78 |
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79 public int getParameterCount(ConstantPool constant_pool) |
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80 throws ConstantPoolException, InvalidDescriptor { |
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81 String desc = getValue(constant_pool); |
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82 int end = desc.indexOf(")"); |
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83 if (end == -1) |
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84 throw new InvalidDescriptor(desc); |
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85 parse(desc, 0, end + 1); |
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86 return count; |
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87 |
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88 } |
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89 |
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90 public String getParameterTypes(ConstantPool constant_pool) |
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91 throws ConstantPoolException, InvalidDescriptor { |
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92 String desc = getValue(constant_pool); |
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93 int end = desc.indexOf(")"); |
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94 if (end == -1) |
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95 throw new InvalidDescriptor(desc); |
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96 return parse(desc, 0, end + 1); |
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97 } |
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98 |
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99 public String getReturnType(ConstantPool constant_pool) |
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100 throws ConstantPoolException, InvalidDescriptor { |
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101 String desc = getValue(constant_pool); |
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102 int end = desc.indexOf(")"); |
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103 if (end == -1) |
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104 throw new InvalidDescriptor(desc); |
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105 return parse(desc, end + 1, desc.length()); |
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106 } |
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107 |
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108 public String getFieldType(ConstantPool constant_pool) |
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109 throws ConstantPoolException, InvalidDescriptor { |
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110 String desc = getValue(constant_pool); |
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111 return parse(desc, 0, desc.length()); |
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112 } |
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113 |
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114 private String parse(String desc, int start, int end) |
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115 throws InvalidDescriptor { |
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116 int p = start; |
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117 StringBuilder sb = new StringBuilder(); |
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118 int dims = 0; |
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119 count = 0; |
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120 |
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121 while (p < end) { |
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122 String type; |
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123 char ch; |
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124 switch (ch = desc.charAt(p++)) { |
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125 case '(': |
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126 sb.append('('); |
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127 continue; |
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128 |
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129 case ')': |
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130 sb.append(')'); |
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131 continue; |
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132 |
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133 case '[': |
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134 dims++; |
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135 continue; |
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136 |
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137 case 'B': |
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138 type = "byte"; |
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139 break; |
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140 |
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141 case 'C': |
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142 type = "char"; |
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143 break; |
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144 |
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145 case 'D': |
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146 type = "double"; |
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147 break; |
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148 |
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149 case 'F': |
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150 type = "float"; |
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151 break; |
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152 |
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153 case 'I': |
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154 type = "int"; |
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155 break; |
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156 |
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157 case 'J': |
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158 type = "long"; |
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159 break; |
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160 |
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161 case 'L': |
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162 int sep = desc.indexOf(';', p); |
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163 if (sep == -1) |
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164 throw new InvalidDescriptor(desc, p - 1); |
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165 type = desc.substring(p, sep).replace('/', '.'); |
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166 p = sep + 1; |
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167 break; |
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168 |
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169 case 'S': |
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170 type = "short"; |
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171 break; |
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172 |
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173 case 'Z': |
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174 type = "boolean"; |
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175 break; |
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176 |
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177 case 'V': |
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178 type = "void"; |
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179 break; |
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180 |
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181 default: |
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182 throw new InvalidDescriptor(desc, p - 1); |
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183 } |
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184 |
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185 if (sb.length() > 1 && sb.charAt(0) == '(') |
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186 sb.append(", "); |
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187 sb.append(type); |
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188 for ( ; dims > 0; dims-- ) |
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189 sb.append("[]"); |
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190 |
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191 count++; |
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192 } |
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193 |
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194 return sb.toString(); |
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195 } |
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196 |
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197 public final int index; |
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198 private int count; |
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199 } |
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