/*
* 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.sshd.common.util;
import java.lang.reflect.Proxy;
import java.util.EventListener;
import java.util.Objects;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public interface SshdEventListener extends EventListener {
/**
* Makes sure that the listener is neither {@code null} nor a proxy
*
* @param <L> Type of {@link SshdEventListener} being validation
* @param listener The listener instance
* @param prefix Prefix text to be prepended to validation failure messages
* @return The validated instance
*/
static <L extends SshdEventListener> L validateListener(L listener, String prefix) {
Objects.requireNonNull(listener, prefix + ": no instance");
ValidateUtils.checkTrue(!Proxy.isProxyClass(listener.getClass()), prefix + ": proxies N/A");
return listener;
}
}