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org.sql2o.reflection.MethodAccessorsGenerator Maven / Gradle / Ivy
package org.sql2o.reflection;
import org.sql2o.Sql2oException;
import sun.reflect.ConstructorAccessor;
import sun.reflect.FieldAccessor;
import sun.reflect.MethodAccessor;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
@SuppressWarnings("UnusedDeclaration")
public class MethodAccessorsGenerator implements MethodGetterFactory, MethodSetterFactory, ObjectConstructorFactory {
private static final ThreadLocal generatorObjectHolder;
private static final MethodAccessor generateMethod;
private static final MethodAccessor generateConstructor;
private static final MethodAccessor generateSerializationConstructor;
private static final MethodAccessor newFieldAccessor;
static {
try {
Class aClass = Class.forName("sun.reflect.MethodAccessorGenerator");
Constructor[] declaredConstructors = aClass.getDeclaredConstructors();
Constructor declaredConstructor = declaredConstructors[0];
declaredConstructor.setAccessible(true);
Object generatorObject = declaredConstructor.newInstance();
Method bar = aClass.getMethod("generateMethod", Class.class, String.class, Class[].class, Class.class, Class[].class, Integer.TYPE);
bar.setAccessible(true);
generateMethod = (MethodAccessor) bar.invoke(
generatorObject,
bar.getDeclaringClass(),
bar.getName(),
bar.getParameterTypes(),
bar.getReturnType(),
bar.getExceptionTypes(),
bar.getModifiers());
bar = aClass.getMethod("generateConstructor", Class.class, Class[].class, Class[].class, Integer.TYPE);
generateConstructor = newMethodAccessor(generatorObject, bar);
bar = aClass.getMethod("generateSerializationConstructor", Class.class, Class[].class, Class[].class, Integer.TYPE, Class.class);
final ConstructorAccessor goc = newConstructorAccessor(generatorObject, declaredConstructor);
generatorObjectHolder = new ThreadLocal() {
@Override
protected Object initialValue() {
try {
return goc.newInstance(null);
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
};
generateSerializationConstructor = newMethodAccessor(generatorObject, bar);
aClass = Class.forName("sun.reflect.UnsafeFieldAccessorFactory");
bar = aClass.getDeclaredMethod("newFieldAccessor", Field.class, Boolean.TYPE);
newFieldAccessor = newMethodAccessor(generatorObject, bar);
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
public static FieldAccessor newFieldAccessor(Field field, boolean overrideFinalCheck) {
try {
return (FieldAccessor) newFieldAccessor.invoke(null, new Object[]{field, overrideFinalCheck});
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
public static MethodAccessor newMethodAccessor(Method bar) {
try {
return newMethodAccessor(generatorObjectHolder.get(), bar);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
private static MethodAccessor newMethodAccessor(Object generatorObject, Method bar) throws InvocationTargetException {
return (MethodAccessor) generateMethod.invoke(
generatorObject, new Object[]{
bar.getDeclaringClass(),
bar.getName(),
bar.getParameterTypes(),
bar.getReturnType(),
bar.getExceptionTypes(),
bar.getModifiers()});
}
public static ConstructorAccessor newConstructorAccessor(Constructor bar) {
try {
return newConstructorAccessor(generatorObjectHolder.get(), bar);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
private static ConstructorAccessor newConstructorAccessor(Object generatorObject, Constructor bar) throws InvocationTargetException {
return (ConstructorAccessor) generateConstructor.invoke(
generatorObject, new Object[]{
bar.getDeclaringClass(),
bar.getParameterTypes(),
bar.getExceptionTypes(),
bar.getModifiers()});
}
public static ConstructorAccessor newConstructorAccessor(Constructor bar, Class targetClass) {
try {
return (ConstructorAccessor) generateSerializationConstructor.invoke(
generatorObjectHolder.get(), new Object[]{
targetClass,
bar.getParameterTypes(),
bar.getExceptionTypes(),
bar.getModifiers(),
bar.getDeclaringClass()});
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
public Getter newGetter(final Method method) {
final Class type = method.getReturnType();
final MethodAccessor methodAccessor = newMethodAccessor(method);
return new Getter() {
public Object getProperty(Object obj) {
try {
return methodAccessor.invoke(obj, null);
} catch (InvocationTargetException e) {
throw new Sql2oException("error while calling getter method with name " + method.getName() + " on class " + obj.getClass().toString(), e);
}
}
public Class getType() {
return type;
}
};
}
public Setter newSetter(final Method method) {
final Class type = method.getParameterTypes()[0];
final MethodAccessor methodAccessor = newMethodAccessor(method);
return new Setter() {
public void setProperty(Object obj, Object value) {
if (value == null && type.isPrimitive()) return;
try {
methodAccessor.invoke(obj, new Object[]{value});
} catch (InvocationTargetException e) {
throw new Sql2oException("error while calling setter method with name " + method.getName() + " on class " + obj.getClass().toString(), e);
}
}
public Class getType() {
return type;
}
};
}
@Override
public ObjectConstructor newConstructor(final Class cls) {
for (Class cls0 = cls; cls != Object.class; cls0 = cls0.getSuperclass()) {
try {
Constructor ctor = cls0.getDeclaredConstructor();
final ConstructorAccessor constructorAccessor = (cls0 == cls)
? newConstructorAccessor(ctor)
: newConstructorAccessor(ctor, cls);
return new ObjectConstructor() {
@Override
public Object newInstance() {
try {
return constructorAccessor.newInstance(null);
} catch (InstantiationException | InvocationTargetException e) {
throw new Sql2oException("Could not create a new instance of class " + cls, e);
}
}
};
} catch (NoSuchMethodException e) {
// ignore
}
}
return UnsafeFieldSetterFactory.getConstructor(cls);
}
}
