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/*
 * Copyright 2012 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 org.jboss.netty.channel;


/**
 * A {@link ChannelEvent} which represents the change of the {@link Channel}
 * state.  It can mean the notification of a change or the request for a
 * change, depending on whether it is an upstream event or a downstream event
 * respectively.  Please refer to the {@link ChannelEvent} documentation to
 * find out what an upstream event and a downstream event are and what
 * fundamental differences they have.
 *
 * @apiviz.has org.jboss.netty.channel.ChannelState
 */
public interface ChannelStateEvent extends ChannelEvent {

    /**
     * Returns the changed property of the {@link Channel}.
     */
    ChannelState getState();

    /**
     * Returns the value of the changed property of the {@link Channel}.
     * Please refer to {@link ChannelState} documentation to find out the
     * allowed values for each property.
     */
    Object getValue();
}