Java tutorial
/* * Copyright 2014 The Netty Project * * The Netty Project 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 io.netty.channel; import io.netty.util.internal.ObjectUtil; import io.netty.util.internal.StringUtil; import java.lang.reflect.Constructor; /** * A {@link ChannelFactory} that instantiates a new {@link Channel} by invoking its default constructor reflectively. */ public class ReflectiveChannelFactory<T extends Channel> implements ChannelFactory<T> { private final Constructor<? extends T> constructor; public ReflectiveChannelFactory(Class<? extends T> clazz) { ObjectUtil.checkNotNull(clazz, "clazz"); try { this.constructor = clazz.getConstructor(); } catch (NoSuchMethodException e) { throw new IllegalArgumentException( "Class " + StringUtil.simpleClassName(clazz) + " does not have a public non-arg constructor", e); } } @Override public T newChannel() { try { return constructor.newInstance(); } catch (Throwable t) { throw new ChannelException("Unable to create Channel from class " + constructor.getDeclaringClass(), t); } } @Override public String toString() { return StringUtil.simpleClassName(ReflectiveChannelFactory.class) + '(' + StringUtil.simpleClassName(constructor.getDeclaringClass()) + ".class)"; } }