1 | /*
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2 | * Copyright 2001-2002,2004 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 | package org.apache.tools.ant.taskdefs.optional.sitraka.bytecode;
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18 |
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19 | import java.io.DataInputStream;
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20 | import java.io.IOException;
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21 | import java.io.InputStream;
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22 | import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ClassCPInfo;
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23 | import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ConstantPool;
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24 | import org.apache.tools.ant.taskdefs.optional.depend.constantpool.Utf8CPInfo;
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25 | import org.apache.tools.ant.taskdefs.optional.sitraka.bytecode.attributes.AttributeInfo;
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26 |
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27 |
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28 | /**
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29 | * Object representing a class.
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30 | *
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31 | * Information are kept to the strict minimum for JProbe reports so
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32 | * that not too many objects are created for a class, otherwise the
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33 | * JVM can quickly run out of memory when analyzing a great deal of
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34 | * classes and keeping them in memory for global analysis.
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35 | *
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36 | */
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37 | public final class ClassFile {
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38 |
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39 | private MethodInfo[] methods;
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40 |
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41 | private String sourceFile;
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42 |
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43 | private String fullname;
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44 |
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45 | private int access_flags;
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46 |
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47 | public ClassFile(InputStream is) throws IOException {
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48 | DataInputStream dis = new DataInputStream(is);
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49 | ConstantPool constantPool = new ConstantPool();
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50 |
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51 | /* int magic = */ dis.readInt(); // 0xCAFEBABE
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52 | /* int minor = */ dis.readShort();
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53 | /* int major = */ dis.readShort();
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54 |
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55 | constantPool.read(dis);
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56 | constantPool.resolve();
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57 |
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58 | // class information
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59 | access_flags = dis.readShort();
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60 | int this_class = dis.readShort();
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61 | fullname = ((ClassCPInfo) constantPool.getEntry(this_class)).getClassName().replace('/', '.');
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62 | /* int super_class = */ dis.readShort();
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63 |
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64 | // skip interfaces...
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65 | int count = dis.readShort();
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66 | dis.skipBytes(count * 2); // short
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67 |
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68 | // skip fields...
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69 | int numFields = dis.readShort();
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70 | for (int i = 0; i < numFields; i++) {
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71 | // 3 short: access flags, name index, descriptor index
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72 | dis.skip(2 * 3);
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73 | // attribute list...
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74 | int attributes_count = dis.readUnsignedShort();
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75 | for (int j = 0; j < attributes_count; j++) {
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76 | dis.skipBytes(2); // skip attr_id (short)
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77 | int len = dis.readInt();
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78 | dis.skipBytes(len);
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79 | }
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80 | }
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81 |
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82 | // read methods
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83 | int method_count = dis.readShort();
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84 | methods = new MethodInfo[method_count];
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85 | for (int i = 0; i < method_count; i++) {
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86 | methods[i] = new MethodInfo();
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87 | methods[i].read(constantPool, dis);
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88 | }
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89 |
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90 | // get interesting attributes.
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91 | int attributes_count = dis.readUnsignedShort();
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92 | for (int j = 0; j < attributes_count; j++) {
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93 | int attr_id = dis.readShort();
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94 | int len = dis.readInt();
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95 | String attr_name = Utils.getUTF8Value(constantPool, attr_id);
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96 | if (AttributeInfo.SOURCE_FILE.equals(attr_name)) {
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97 | int name_index = dis.readShort();
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98 | sourceFile = ((Utf8CPInfo) constantPool.getEntry(name_index)).getValue();
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99 | } else {
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100 | dis.skipBytes(len);
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101 | }
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102 | }
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103 | }
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104 |
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105 | public int getAccess() {
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106 | return access_flags;
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107 | }
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108 |
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109 | public String getSourceFile() {
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110 | return sourceFile;
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111 | }
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112 |
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113 | public MethodInfo[] getMethods() {
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114 | return methods;
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115 | }
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116 |
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117 | public String getFullName() {
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118 | return fullname;
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119 | }
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120 |
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121 | public String getName() {
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122 | String name = getFullName();
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123 | int pos = name.lastIndexOf('.');
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124 | if (pos == -1) {
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125 | return "";
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126 | }
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127 | return name.substring(pos + 1);
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128 | }
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129 |
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130 | public String getPackage() {
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131 | String name = getFullName();
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132 | int pos = name.lastIndexOf('.');
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133 | if (pos == -1) {
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134 | return "";
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135 | }
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136 | return name.substring(0, pos);
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137 | }
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138 |
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139 | }
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140 |
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141 |
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142 |
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143 |
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144 |
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