/**
 * 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.cxf.dosgi.common.proxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import java.util.Arrays;
import java.util.Collection;

public class ServiceInvocationHandler implements InvocationHandler {
    private static final Collection<Method> OBJECT_METHODS = Arrays.asList(Object.class.getMethods());
    private Object serviceObject;
    private ExceptionMapper exceptionMapper;

    ServiceInvocationHandler(Object serviceObject, Class<?> iType) {
        this.serviceObject = serviceObject;
        this.exceptionMapper = new ExceptionMapper(iType);

    }

    public Object invoke(Object proxy, final Method m, Object[] params) throws Throwable {
        if (OBJECT_METHODS.contains(m)) {
            if (m.getName().equals("equals")) {
                params = new Object[] {Proxy.getInvocationHandler(params[0])};
            }
            return m.invoke(this, params);
        }

        ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
            final Object[] paramsFinal = params;
            return AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
                public Object run() throws Exception {
                    return m.invoke(serviceObject, paramsFinal);
                }
            });
        } catch (Throwable ex) {
            Throwable theCause = ex.getCause() == null ? ex : ex.getCause();
            throw exceptionMapper.mapException(m, theCause);
        } finally {
            Thread.currentThread().setContextClassLoader(oldCl);
        }
    }

}