/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.jena.permissions.impl;
import java.lang.reflect.Proxy;
import java.util.LinkedHashSet;
import java.util.Set;
import org.apache.commons.lang3.ClassUtils;
import org.apache.jena.permissions.SecuredItem;
/**
* A class that holds the original item and the secured version of it.
*
* This class is used by the Invoker to return secured versions of the object
* during
* calls that return the called class for cascading.
*
* @param <Base>
* The base class that is being secured
* @param <Secured>
* The implementation (proxy) of the secured class.
*/
public class ItemHolder<Base, Secured extends SecuredItem>
{
/**
* The base item that is being secured
*/
private final Base baseItem;
/**
* The proxy to the base class that implements the security.
*/
private Secured securedItem;
/**
* Constructor.
*
* @param baseItem
* The base item.
*/
public ItemHolder( final Base baseItem )
{
super();
this.baseItem = baseItem;
}
/**
* Get the base item.
*
* This method is used in the proxy to get call to the underlying instance.
*
* @return The instance that is being protected.
*/
public Base getBaseItem()
{
return baseItem;
}
/**
* Get the secured item.
*
* This method is used in the invocation handler to get the instance of the
* proxy that made the
* on which a method call was made. Generally used in returing the original
* object to support
* cascading.
*
* @return the proxy.
*/
public Secured getSecuredItem()
{
return securedItem;
}
/**
* Creates the proxy, saves it as the securedItem and returns it.
*
* @param handler
* The SecuredItemInvoker to create the proxy with.
* @return The proxy.
*/
@SuppressWarnings( "unchecked" )
public final Secured setSecuredItem( final SecuredItemInvoker handler )
{
final Set<Class<?>> ifac = new LinkedHashSet<Class<?>>();
if (baseItem.getClass().isInterface())
{
ifac.add(baseItem.getClass());
}
ifac.addAll(ClassUtils.getAllInterfaces(baseItem.getClass()));
if (handler.securedItem.getClass().isInterface())
{
ifac.add(handler.securedItem.getClass());
}
ifac.addAll(ClassUtils.getAllInterfaces(handler.securedItem.getClass()));
securedItem = (Secured) Proxy.newProxyInstance(
SecuredItemImpl.class.getClassLoader(),
ifac.toArray(new Class<?>[ifac.size()]), handler);
return securedItem;
}
}