ChannelMatchers.java — netty Source File

Source Code

/*
 * Copyright 2013 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:
 *
 *   https://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.group;

import io.netty.channel.Channel;
import io.netty.channel.ServerChannel;

/**
 * Helper class which provides often used {@link ChannelMatcher} implementations.
 */
public final class ChannelMatchers {

    private static final ChannelMatcher ALL_MATCHER = new ChannelMatcher() {
        @Override
        public boolean matches(Channel channel) {
            return true;
        }
    };

    private static final ChannelMatcher SERVER_CHANNEL_MATCHER = isInstanceOf(ServerChannel.class);
    private static final ChannelMatcher NON_SERVER_CHANNEL_MATCHER = isNotInstanceOf(ServerChannel.class);

    private ChannelMatchers() {
        // static methods only
    }

    /**
     * Returns a {@link ChannelMatcher} that matches all {@link Channel}s.
     */
    public static ChannelMatcher all() {
        return ALL_MATCHER;
    }

    /**
     * Returns a {@link ChannelMatcher} that matches all {@link Channel}s except the given.
     */
    public static ChannelMatcher isNot(Channel channel) {
        return invert(is(channel));
    }

    /**
     * Returns a {@link ChannelMatcher} that matches the given {@link Channel}.
     */
    public static ChannelMatcher is(Channel channel) {
        return new InstanceMatcher(channel);
    }

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