Java tutorial
/* * Copyright 2015 the original author or authors. * * Licensed 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 org.springframework.statemachine; import java.util.Map; /** * Extended states are used to supplement state machine with a variables. If * extended state is used a complete condition of a state machine is a * combination of its state an extended state variables. * * @author Janne Valkealahti * */ public interface ExtendedState { /** * Gets the extended state variables. * * @return the extended state variables */ Map<Object, Object> getVariables(); /** * Gets a variable which is automatically casted into a type. * * @param <T> the return type * @param key the variable key * @param type the variable type * @return the variable */ <T> T get(Object key, Class<T> type); /** * Sets the extended state change listener. * * @param listener the new extended state change listener */ void setExtendedStateChangeListener(ExtendedStateChangeListener listener); /** * The listener interface for receiving extended state change events. */ public interface ExtendedStateChangeListener { /** * Called when extended state variable has been changed. * * @param key the key * @param value the value */ void changed(Object key, Object value); } }