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AsmSerializableBeanGenerator.java
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AsmSerializableBeanGenerator.java
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/*
* Copyright (c) 2021, 2023 Contributors to the Eclipse Foundation.
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.ejb.codegen;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
import static com.sun.ejb.codegen.ClassGenerator.defineClass;
import static org.objectweb.asm.Opcodes.ACC_PRIVATE;
import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static org.objectweb.asm.Opcodes.ALOAD;
import static org.objectweb.asm.Opcodes.INVOKESTATIC;
import static org.objectweb.asm.Opcodes.RETURN;
import static org.objectweb.asm.Opcodes.V11;
public class AsmSerializableBeanGenerator extends BeanGeneratorBase {
private final ClassLoader loader;
private final Class<?> superClass;
private final String subClassName;
/**
* Adds _Serializable to the original name.
*
* @param beanClass full class name
*/
public static String getGeneratedSerializableClassName(String beanClass) {
String packageName = Generator.getPackageName(beanClass);
String simpleName = Generator.getBaseName(beanClass);
String generatedSimpleName = "_" + simpleName + "_Serializable";
return packageName == null ? generatedSimpleName : packageName + "." + generatedSimpleName;
}
public AsmSerializableBeanGenerator(ClassLoader loader, Class<?> superClass, String serializableSubclassName) {
this.loader = loader;
this.superClass = superClass;
this.subClassName = serializableSubclassName;
}
@SuppressWarnings("unused")
public String getSerializableSubclassName() {
return subClassName;
}
public Class<?> generateSerializableSubclass() {
String subClassInternalName = subClassName.replace('.', '/');
ClassWriter cw = new ClassWriter(0);
cw.visit(V11, ACC_PUBLIC, subClassInternalName, null, Type.getInternalName(superClass), new String[] {"java/io/Serializable"});
generateConstructor(cw, superClass, false);
generateWriteObjectMethod(cw);
generateReadObjectMethod(cw);
cw.visitEnd();
PrivilegedAction<Class<?>> action =
() -> defineClass(loader, subClassName, cw.toByteArray(), superClass.getProtectionDomain());
return AccessController.doPrivileged(action);
}
private static void generateWriteObjectMethod(ClassVisitor cv) {
MethodVisitor mv = cv.visitMethod(ACC_PRIVATE,
"writeObject",
"(Ljava/io/ObjectOutputStream;)V",
null,
new String[] {"java/io/IOException"});
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKESTATIC,
"com/sun/ejb/EJBUtils",
"serializeObjectFields",
"(Ljava/lang/Object;Ljava/io/ObjectOutputStream;)V",
false);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
private static void generateReadObjectMethod(ClassVisitor cv) {
MethodVisitor mv = cv.visitMethod(ACC_PRIVATE,
"readObject",
"(Ljava/io/ObjectInputStream;)V",
null,
new String[] {"java/io/IOException", "java/lang/ClassNotFoundException"});
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKESTATIC,
"com/sun/ejb/EJBUtils",
"deserializeObjectFields",
"(Ljava/lang/Object;Ljava/io/ObjectInputStream;)V",
false);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
}