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 package com.sun.tools.classfile; |
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27 |
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28 import java.io.File; |
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29 import java.io.IOException; |
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30 import java.io.InputStream; |
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31 import java.nio.file.Files; |
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32 import java.nio.file.Path; |
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33 |
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34 import static com.sun.tools.classfile.AccessFlags.*; |
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35 |
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36 /** |
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37 * See JVMS, section 4.2. |
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38 * |
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39 * <p><b>This is NOT part of any supported API. |
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40 * If you write code that depends on this, you do so at your own risk. |
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41 * This code and its internal interfaces are subject to change or |
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42 * deletion without notice.</b> |
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43 */ |
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44 public class ClassFile { |
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45 public static ClassFile read(File file) |
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46 throws IOException, ConstantPoolException { |
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47 return read(file.toPath(), new Attribute.Factory()); |
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48 } |
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49 |
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50 public static ClassFile read(Path input) |
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51 throws IOException, ConstantPoolException { |
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52 return read(input, new Attribute.Factory()); |
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53 } |
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54 |
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55 public static ClassFile read(Path input, Attribute.Factory attributeFactory) |
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56 throws IOException, ConstantPoolException { |
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57 try (InputStream in = Files.newInputStream(input)) { |
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58 return new ClassFile(in, attributeFactory); |
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59 } |
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60 } |
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61 |
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62 public static ClassFile read(File file, Attribute.Factory attributeFactory) |
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63 throws IOException, ConstantPoolException { |
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64 return read(file.toPath(), attributeFactory); |
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65 } |
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66 |
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67 public static ClassFile read(InputStream in) |
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68 throws IOException, ConstantPoolException { |
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69 return new ClassFile(in, new Attribute.Factory()); |
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70 } |
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71 |
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72 public static ClassFile read(InputStream in, Attribute.Factory attributeFactory) |
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73 throws IOException, ConstantPoolException { |
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74 return new ClassFile(in, attributeFactory); |
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75 } |
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76 |
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77 ClassFile(InputStream in, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException { |
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78 ClassReader cr = new ClassReader(this, in, attributeFactory); |
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79 magic = cr.readInt(); |
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80 minor_version = cr.readUnsignedShort(); |
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81 major_version = cr.readUnsignedShort(); |
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82 constant_pool = new ConstantPool(cr); |
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83 access_flags = new AccessFlags(cr); |
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84 this_class = cr.readUnsignedShort(); |
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85 super_class = cr.readUnsignedShort(); |
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86 |
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87 int interfaces_count = cr.readUnsignedShort(); |
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88 interfaces = new int[interfaces_count]; |
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89 for (int i = 0; i < interfaces_count; i++) |
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90 interfaces[i] = cr.readUnsignedShort(); |
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91 |
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92 int fields_count = cr.readUnsignedShort(); |
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93 fields = new Field[fields_count]; |
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94 for (int i = 0; i < fields_count; i++) |
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95 fields[i] = new Field(cr); |
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96 |
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97 int methods_count = cr.readUnsignedShort(); |
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98 methods = new Method[methods_count]; |
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99 for (int i = 0; i < methods_count; i++) |
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100 methods[i] = new Method(cr); |
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101 |
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102 attributes = new Attributes(cr); |
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103 } |
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104 |
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105 public ClassFile(int magic, int minor_version, int major_version, |
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106 ConstantPool constant_pool, AccessFlags access_flags, |
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107 int this_class, int super_class, int[] interfaces, |
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108 Field[] fields, Method[] methods, Attributes attributes) { |
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109 this.magic = magic; |
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110 this.minor_version = minor_version; |
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111 this.major_version = major_version; |
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112 this.constant_pool = constant_pool; |
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113 this.access_flags = access_flags; |
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114 this.this_class = this_class; |
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115 this.super_class = super_class; |
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116 this.interfaces = interfaces; |
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117 this.fields = fields; |
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118 this.methods = methods; |
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119 this.attributes = attributes; |
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120 } |
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121 |
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122 public String getName() throws ConstantPoolException { |
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123 return constant_pool.getClassInfo(this_class).getName(); |
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124 } |
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125 |
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126 public String getSuperclassName() throws ConstantPoolException { |
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127 return constant_pool.getClassInfo(super_class).getName(); |
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128 } |
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129 |
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130 public String getInterfaceName(int i) throws ConstantPoolException { |
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131 return constant_pool.getClassInfo(interfaces[i]).getName(); |
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132 } |
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133 |
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134 public Attribute getAttribute(String name) { |
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135 return attributes.get(name); |
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136 } |
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137 |
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138 public boolean isClass() { |
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139 return !isInterface(); |
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140 } |
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141 |
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142 public boolean isInterface() { |
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143 return access_flags.is(ACC_INTERFACE); |
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144 } |
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145 |
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146 public int byteLength() { |
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147 return 4 + // magic |
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148 2 + // minor |
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149 2 + // major |
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150 constant_pool.byteLength() + |
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151 2 + // access flags |
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152 2 + // this_class |
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153 2 + // super_class |
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154 byteLength(interfaces) + |
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155 byteLength(fields) + |
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156 byteLength(methods) + |
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157 attributes.byteLength(); |
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158 } |
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159 |
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160 private int byteLength(int[] indices) { |
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161 return 2 + 2 * indices.length; |
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162 } |
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163 |
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164 private int byteLength(Field[] fields) { |
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165 int length = 2; |
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166 for (Field f: fields) |
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167 length += f.byteLength(); |
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168 return length; |
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169 } |
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170 |
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171 private int byteLength(Method[] methods) { |
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172 int length = 2; |
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173 for (Method m: methods) |
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174 length += m.byteLength(); |
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175 return length; |
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176 } |
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177 |
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178 public final int magic; |
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179 public final int minor_version; |
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180 public final int major_version; |
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181 public final ConstantPool constant_pool; |
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182 public final AccessFlags access_flags; |
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183 public final int this_class; |
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184 public final int super_class; |
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185 public final int[] interfaces; |
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186 public final Field[] fields; |
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187 public final Method[] methods; |
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188 public final Attributes attributes; |
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189 } |
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