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Added ConstructorAccess.

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This commit is contained in:
Nathan Sweet 2012-04-27 16:30:21 +00:00
parent 8aff0378d2
commit c599cc03ab
1 changed files with 60 additions and 0 deletions
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src/com/esotericsoftware/reflectasm/ConstructorAccess.java Normal file
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package com.esotericsoftware.reflectasm;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import static org.objectweb.asm.Opcodes.*;
public abstract class ConstructorAccess<T> {
static public <T> ConstructorAccess<T> get (Class<T> type) {
AccessClassLoader loader = new AccessClassLoader(type.getClassLoader());
String className = type.getName();
String accessClassName = className + "ConstructorAccess";
if (accessClassName.startsWith("java.")) accessClassName = "reflectasm." + accessClassName;
Class accessClass = null;
try {
accessClass = loader.loadClass(accessClassName);
} catch (ClassNotFoundException ignored) {
}
if (accessClass == null) {
String accessClassNameInternal = accessClassName.replace('.', '/');
String classNameInternal = className.replace('.', '/');
ClassWriter cw = new ClassWriter(0);
cw.visit(V1_1, ACC_PUBLIC + ACC_SUPER, accessClassNameInternal, null,
"com/esotericsoftware/reflectasm/ConstructorAccess", null);
MethodVisitor mv;
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "com/esotericsoftware/reflectasm/ConstructorAccess", "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC, "newInstance", "()Ljava/lang/Object;", null, null);
mv.visitCode();
mv.visitTypeInsn(NEW, classNameInternal);
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, classNameInternal, "<init>", "()V");
mv.visitInsn(ARETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
cw.visitEnd();
byte[] data = cw.toByteArray();
accessClass = loader.defineClass(accessClassName, data);
}
try {
return (ConstructorAccess)accessClass.newInstance();
} catch (Exception ex) {
throw new RuntimeException("Error constructing field access class: " + accessClassName, ex);
}
}
abstract public T newInstance ();
}