1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.mina.statemachine.context; 21 22 import org.apache.mina.statemachine.State; 23 import org.apache.mina.statemachine.StateMachine; 24 25 /** 26 * {@link StateContext} objects are used to store the current {@link State} and 27 * any application specific attributes for a specific client of a 28 * {@link StateMachine}. Since {@link StateMachine}s are singletons and shared 29 * by all clients using the {@link StateMachine} this is where client specific 30 * data needs to be stored. 31 * 32 * @author The Apache MINA Project (dev@mina.apache.org) 33 */ 34 public interface StateContext { 35 /** 36 * Returns the current {@link State}. This is only meant for internal use. 37 * 38 * @return the current {@link State}. 39 */ 40 State getCurrentState(); 41 42 /** 43 * Sets the current {@link State}. This is only meant for internal use. 44 * Don't call it directly! 45 * 46 * @param state the new current {@link State}. 47 */ 48 void setCurrentState(State state); 49 50 /** 51 * Returns the value of the attribute with the specified key or 52 * <code>null</code>if not found. 53 * 54 * @param key the key. 55 * @return the value or <code>null</code>. 56 */ 57 Object getAttribute(Object key); 58 59 /** 60 * Sets the value of the attribute with the specified key. 61 * 62 * @param key the key. 63 * @param value the value. 64 */ 65 void setAttribute(Object key, Object value); 66 }