001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.mina.statemachine.context;
021
022import org.apache.mina.statemachine.event.Event;
023
024/**
025 * Lookups a {@link StateContext} from a collection of event arguments.
026 *
027 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
028 */
029public interface StateContextLookup {
030    /**
031     * Searches the arguments from an {@link Event} and returns a 
032     * {@link StateContext} if any of the arguments holds one. NOTE! This method
033     * must create a new {@link StateContext} if a compatible object is in
034     * the arguments and the next time that same object is passed to this
035     * method the same {@link StateContext} should be returned.
036     * 
037     * @param eventArgs The arguments we are looking for
038     * @return The StateContext we are looking for
039     */
040    StateContext lookup(Object[] eventArgs);
041}