/*
* Copyright 2013 Christopher Pheby
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jadira.reflection.access.portable;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.concurrent.ConcurrentHashMap;
import org.jadira.reflection.access.AbstractClassAccess;
import org.jadira.reflection.access.api.ClassAccess;
import org.jadira.reflection.access.api.FieldAccess;
import org.jadira.reflection.access.api.MethodAccess;
import org.objenesis.Objenesis;
import org.objenesis.ObjenesisStd;
/**
* ClassAccess implementation which should be portable across most JVMs.
* Uses Reflection to access methods, and Objenesis to invoke constructors.
* @param <C> The Class to be accessed
*/
public class PortableClassAccess<C> extends AbstractClassAccess<C> implements ClassAccess<C> {
private static final ConcurrentHashMap<Class<?>, PortableClassAccess<?>> CLASS_ACCESSES = new ConcurrentHashMap<Class<?>, PortableClassAccess<?>>();
private static final Objenesis OBJENESIS = new ObjenesisStd();
private PortableClassAccess(Class<C> clazz) {
super(clazz);
}
@Override
public C newInstance() {
return (C) OBJENESIS.newInstance(getType());
}
/**
* Get a new instance that can access the given Class. If the ClassAccess for this class
* has not been obtained before, then the specific PortableClassAccess is created by generating
* a specialised subclass of this class and returning it.
* @param clazz Class to be accessed
* @param <C> The type of class
* @return New PortableClassAccess instance
*/
public static <C> PortableClassAccess<C> get(Class<C> clazz) {
@SuppressWarnings("unchecked")
PortableClassAccess<C> access = (PortableClassAccess<C>) CLASS_ACCESSES.get(clazz);
if (access != null) {
return access;
}
access = new PortableClassAccess<C>(clazz);
CLASS_ACCESSES.putIfAbsent(clazz, access);
return access;
}
@Override
protected MethodAccess<C> constructMethodAccess(Method method) {
return PortableMethodAccess.get(method);
}
@Override
protected FieldAccess<C> constructFieldAccess(Field field) {
return PortableFieldAccess.get(field);
}
@Override
protected <X> ClassAccess<X> constructClassAccess(Class<X> clazz) {
return PortableClassAccess.get(clazz);
}
}