package org.osgl.util;
import org.osgl.$;
import org.osgl.Osgl;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
/**
* The base class for {@link ReflectionPropertyGetter} and {@link ReflectionPropertySetter}
*/
abstract class ReflectionPropertyHandler extends PropertyHandlerBase {
protected transient Class entityClass;
protected transient Method m;
protected String mn;
protected transient Field f;
protected String fn;
protected transient Class propertyClass;
protected String propertyClassName;
ReflectionPropertyHandler(Osgl.Function<Class<?>, Object> objectFactory,
Osgl.Func2<String, Class<?>, ?> stringValueResolver,
Class entityClass, Method m, Field f) {
super(objectFactory, stringValueResolver);
init(entityClass, m, f);
}
ReflectionPropertyHandler(Osgl.Function<Class<?>, Object> objectFactory,
Osgl.Func2<String, Class<?>, ?> stringValueResolver,
PropertyGetter.NullValuePolicy nullValuePolicy,
Class entityClass, Method m, Field f) {
super(objectFactory, stringValueResolver, nullValuePolicy);
init(entityClass, m, f);
}
ReflectionPropertyHandler(Class entityClass, Method m, Field f) {
init(entityClass, m, f);
}
ReflectionPropertyHandler(PropertyGetter.NullValuePolicy nullValuePolicy,
Class entityClass, Method m, Field f) {
super(nullValuePolicy);
init(entityClass, m, f);
}
public Class getPropertyClass(Object entity) {
if (null != propertyClass) {
return propertyClass;
}
return $.classForName(propertyClassName, entity.getClass().getClassLoader());
}
protected void ensureMethodOrField(Object obj) {
if (null != m || null != f) return;
try {
if (null == entityClass) {
entityClass = obj.getClass();
}
if (null != mn) {
m = entityClass.getMethod(mn);
m.setAccessible(true);
} else if (null != fn) {
f = entityClass.getDeclaredField(fn);
f.setAccessible(true);
} else {
throw E.unexpected("neither method name nor field name found");
}
} catch (Exception e) {
throw E.unexpected(e);
}
}
private void init(Class c, Method m, Field f) {
E.illegalArgumentIf(null == m && null == f);
this.entityClass = c;
this.m = m;
this.f = f;
if (null != m) {
this.mn = m.getName();
this.propertyClass = m.getReturnType();
if (void.class.equals(this.propertyClass)) {
this.propertyClass = m.getParameterTypes()[0];
}
} else {
this.fn = f.getName();
this.propertyClass = f.getType();
}
this.propertyClassName = propertyClass.getName();
}
}