author | sdrach |
Fri, 29 Jul 2016 09:58:28 -0700 | |
changeset 40251 | 481b890e50a3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.tools.jar; |
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import jdk.internal.org.objectweb.asm.*; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.security.MessageDigest; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.Map; |
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import java.util.Set; |
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/** |
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* A FingerPrint is an abstract representation of a JarFile entry that contains |
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* information to determine if the entry represents a class or a |
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* resource, and whether two entries are identical. If the FingerPrint represents |
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* a class, it also contains information to (1) describe the public API; |
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* (2) compare the public API of this class with another class; (3) determine |
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* whether or not it's a nested class and, if so, the name of the associated |
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* top level class; and (4) for an canonically ordered set of classes determine |
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* if the class versions are compatible. A set of classes is canonically |
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* ordered if the classes in the set have the same name, and the base class |
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* precedes the versioned classes and if each versioned class with version |
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* {@code n} precedes classes with versions {@code > n} for all versions |
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* {@code n}. |
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*/ |
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final class FingerPrint { |
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private static final MessageDigest MD; |
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private final byte[] sha1; |
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private final ClassAttributes attrs; |
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private final boolean isClassEntry; |
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private final String entryName; |
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static { |
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try { |
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MD = MessageDigest.getInstance("SHA-1"); |
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} catch (NoSuchAlgorithmException x) { |
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// log big problem? |
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throw new RuntimeException(x); |
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} |
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} |
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public FingerPrint(String entryName,byte[] bytes) throws IOException { |
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this.entryName = entryName; |
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if (entryName.endsWith(".class") && isCafeBabe(bytes)) { |
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isClassEntry = true; |
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sha1 = sha1(bytes, 8); // skip magic number and major/minor version |
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attrs = getClassAttributes(bytes); |
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} else { |
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isClassEntry = false; |
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sha1 = sha1(bytes); |
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attrs = new ClassAttributes(); // empty class |
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} |
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} |
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public boolean isClass() { |
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return isClassEntry; |
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} |
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public boolean isNestedClass() { |
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return attrs.nestedClass; |
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} |
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public boolean isPublicClass() { |
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return attrs.publicClass; |
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} |
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public boolean isIdentical(FingerPrint that) { |
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if (that == null) return false; |
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if (this == that) return true; |
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return isEqual(this.sha1, that.sha1); |
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} |
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public boolean isCompatibleVersion(FingerPrint that) { |
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return attrs.version >= that.attrs.version; |
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} |
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public boolean isSameAPI(FingerPrint that) { |
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if (that == null) return false; |
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return attrs.equals(that.attrs); |
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} |
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public String name() { |
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String name = attrs.name; |
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return name == null ? entryName : name; |
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} |
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public String topLevelName() { |
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String name = attrs.topLevelName; |
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return name == null ? name() : name; |
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} |
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private byte[] sha1(byte[] entry) { |
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MD.update(entry); |
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return MD.digest(); |
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} |
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private byte[] sha1(byte[] entry, int offset) { |
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MD.update(entry, offset, entry.length - offset); |
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return MD.digest(); |
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} |
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private boolean isEqual(byte[] sha1_1, byte[] sha1_2) { |
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return MessageDigest.isEqual(sha1_1, sha1_2); |
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} |
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private static final byte[] cafeBabe = {(byte)0xca, (byte)0xfe, (byte)0xba, (byte)0xbe}; |
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135 |
|
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private boolean isCafeBabe(byte[] bytes) { |
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if (bytes.length < 4) return false; |
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138 |
for (int i = 0; i < 4; i++) { |
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if (bytes[i] != cafeBabe[i]) { |
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return false; |
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141 |
} |
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142 |
} |
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return true; |
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144 |
} |
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145 |
|
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146 |
private ClassAttributes getClassAttributes(byte[] bytes) { |
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ClassReader rdr = new ClassReader(bytes); |
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ClassAttributes attrs = new ClassAttributes(); |
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rdr.accept(attrs, 0); |
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return attrs; |
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} |
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152 |
|
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153 |
private static final class Field { |
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private final int access; |
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private final String name; |
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private final String desc; |
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157 |
|
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158 |
Field(int access, String name, String desc) { |
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this.access = access; |
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this.name = name; |
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this.desc = desc; |
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162 |
} |
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163 |
|
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164 |
@Override |
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165 |
public boolean equals(Object that) { |
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166 |
if (that == null) return false; |
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167 |
if (this == that) return true; |
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|
168 |
if (!(that instanceof Field)) return false; |
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Field field = (Field)that; |
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return (access == field.access) && name.equals(field.name) |
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&& desc.equals(field.desc); |
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172 |
} |
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173 |
|
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174 |
@Override |
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175 |
public int hashCode() { |
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int result = 17; |
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result = 37 * result + access; |
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result = 37 * result + name.hashCode(); |
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179 |
result = 37 * result + desc.hashCode(); |
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180 |
return result; |
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181 |
} |
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182 |
} |
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183 |
|
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184 |
private static final class Method { |
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185 |
private final int access; |
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186 |
private final String name; |
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187 |
private final String desc; |
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188 |
private final Set<String> exceptions; |
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|
189 |
|
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190 |
Method(int access, String name, String desc, Set<String> exceptions) { |
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this.access = access; |
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192 |
this.name = name; |
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193 |
this.desc = desc; |
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194 |
this.exceptions = exceptions; |
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195 |
} |
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|
196 |
|
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|
197 |
@Override |
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|
198 |
public boolean equals(Object that) { |
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|
199 |
if (that == null) return false; |
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|
200 |
if (this == that) return true; |
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|
201 |
if (!(that instanceof Method)) return false; |
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|
202 |
Method method = (Method)that; |
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|
203 |
return (access == method.access) && name.equals(method.name) |
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|
204 |
&& desc.equals(method.desc) |
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|
205 |
&& exceptions.equals(method.exceptions); |
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|
206 |
} |
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|
207 |
|
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|
208 |
@Override |
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|
209 |
public int hashCode() { |
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|
210 |
int result = 17; |
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|
211 |
result = 37 * result + access; |
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|
212 |
result = 37 * result + name.hashCode(); |
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|
213 |
result = 37 * result + desc.hashCode(); |
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|
214 |
result = 37 * result + exceptions.hashCode(); |
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|
215 |
return result; |
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|
216 |
} |
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|
217 |
} |
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|
218 |
|
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|
219 |
private static final class ClassAttributes extends ClassVisitor { |
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|
220 |
private String name; |
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|
221 |
private String topLevelName; |
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|
222 |
private String superName; |
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|
223 |
private int version; |
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|
224 |
private int access; |
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|
225 |
private boolean publicClass; |
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|
226 |
private boolean nestedClass; |
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|
227 |
private final Set<Field> fields = new HashSet<>(); |
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|
228 |
private final Set<Method> methods = new HashSet<>(); |
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|
229 |
|
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|
230 |
public ClassAttributes() { |
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|
231 |
super(Opcodes.ASM5); |
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|
232 |
} |
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|
233 |
|
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|
234 |
private boolean isPublic(int access) { |
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|
235 |
return ((access & Opcodes.ACC_PUBLIC) == Opcodes.ACC_PUBLIC) |
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|
236 |
|| ((access & Opcodes.ACC_PROTECTED) == Opcodes.ACC_PROTECTED); |
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|
237 |
} |
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|
238 |
|
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|
239 |
@Override |
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|
240 |
public void visit(int version, int access, String name, String signature, |
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|
241 |
String superName, String[] interfaces) { |
481b890e50a3
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|
242 |
this.version = version; |
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|
243 |
this.access = access; |
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|
244 |
this.name = name; |
481b890e50a3
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|
245 |
this.nestedClass = name.contains("$"); |
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|
246 |
this.superName = superName; |
481b890e50a3
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|
247 |
this.publicClass = isPublic(access); |
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|
248 |
} |
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|
249 |
|
481b890e50a3
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|
250 |
@Override |
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|
251 |
public void visitOuterClass(String owner, String name, String desc) { |
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|
252 |
if (!this.nestedClass) return; |
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|
253 |
this.topLevelName = owner; |
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|
254 |
} |
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|
255 |
|
481b890e50a3
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|
256 |
@Override |
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|
257 |
public void visitInnerClass(String name, String outerName, String innerName, |
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|
258 |
int access) { |
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|
259 |
if (!this.nestedClass) return; |
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|
260 |
if (outerName == null) return; |
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|
261 |
if (!this.name.equals(name)) return; |
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|
262 |
if (this.topLevelName == null) this.topLevelName = outerName; |
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|
263 |
} |
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|
264 |
|
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|
265 |
@Override |
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|
266 |
public FieldVisitor visitField(int access, String name, String desc, |
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|
267 |
String signature, Object value) { |
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|
268 |
if (isPublic(access)) { |
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|
269 |
fields.add(new Field(access, name, desc)); |
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|
270 |
} |
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|
271 |
return null; |
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} |
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|
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@Override |
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public MethodVisitor visitMethod(int access, String name, String desc, |
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String signature, String[] exceptions) { |
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if (isPublic(access)) { |
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Set<String> exceptionSet = new HashSet<>(); |
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if (exceptions != null) { |
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for (String e : exceptions) { |
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exceptionSet.add(e); |
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} |
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} |
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// treat type descriptor as a proxy for signature because signature |
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// is usually null, need to strip off the return type though |
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int n; |
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if (desc != null && (n = desc.lastIndexOf(')')) != -1) { |
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desc = desc.substring(0, n + 1); |
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methods.add(new Method(access, name, desc, exceptionSet)); |
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} |
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} |
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return null; |
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} |
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|
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@Override |
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public void visitEnd() { |
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this.nestedClass = this.topLevelName != null; |
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} |
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|
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@Override |
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public boolean equals(Object that) { |
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if (that == null) return false; |
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if (this == that) return true; |
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if (!(that instanceof ClassAttributes)) return false; |
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ClassAttributes clsAttrs = (ClassAttributes)that; |
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boolean superNameOkay = superName != null |
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? superName.equals(clsAttrs.superName) : true; |
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return access == clsAttrs.access |
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&& superNameOkay |
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&& fields.equals(clsAttrs.fields) |
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&& methods.equals(clsAttrs.methods); |
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} |
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|
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@Override |
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public int hashCode() { |
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int result = 17; |
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result = 37 * result + access; |
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result = 37 * result + superName != null ? superName.hashCode() : 0; |
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result = 37 * result + fields.hashCode(); |
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result = 37 * result + methods.hashCode(); |
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return result; |
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} |
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} |
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} |