| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.flink.cep.nfa; |
| |
| import org.apache.flink.cep.pattern.conditions.IterativeCondition; |
| |
| import java.io.Serializable; |
| import java.util.Objects; |
| |
| /** |
| * Represents a transition from one {@link State} to another. |
| * |
| * @param <T> type of events that are handled by the {@link IterativeCondition} |
| */ |
| public class StateTransition<T> implements Serializable { |
| private static final long serialVersionUID = -4825345749997891838L; |
| |
| private final StateTransitionAction action; |
| private final State<T> sourceState; |
| private final State<T> targetState; |
| private IterativeCondition<T> condition; |
| |
| public StateTransition( |
| final State<T> sourceState, |
| final StateTransitionAction action, |
| final State<T> targetState, |
| final IterativeCondition<T> condition) { |
| this.action = action; |
| this.targetState = targetState; |
| this.sourceState = sourceState; |
| this.condition = condition; |
| } |
| |
| public StateTransitionAction getAction() { |
| return action; |
| } |
| |
| public State<T> getTargetState() { |
| return targetState; |
| } |
| |
| public State<T> getSourceState() { |
| return sourceState; |
| } |
| |
| public IterativeCondition<T> getCondition() { |
| return condition; |
| } |
| |
| public void setCondition(IterativeCondition<T> condition) { |
| this.condition = condition; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof StateTransition) { |
| @SuppressWarnings("unchecked") |
| StateTransition<T> other = (StateTransition<T>) obj; |
| |
| return action == other.action && |
| sourceState.getName().equals(other.sourceState.getName()) && |
| targetState.getName().equals(other.targetState.getName()); |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| // we have to take the name of targetState because the transition might be reflexive |
| return Objects.hash(action, targetState.getName(), sourceState.getName()); |
| } |
| |
| @Override |
| public String toString() { |
| return new StringBuilder() |
| .append("StateTransition(") |
| .append(action).append(", ") |
| .append("from ").append(sourceState.getName()) |
| .append("to ").append(targetState.getName()) |
| .append(condition != null ? ", with condition)" : ")") |
| .toString(); |
| } |
| |
| } |