| /* |
| * 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.iotdb.commons.path.fa; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.commons.path.PathPatternTree; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Objects; |
| |
| /** |
| * This interface defines the behaviour of a FA(Finite Automation), generated from a path pattern or |
| * a pattern tree. |
| */ |
| public interface IPatternFA { |
| |
| /** |
| * @param state the source state of the returned transitions |
| * @return transitions, that the given state has and only match one specified event rather than |
| * batch events |
| */ |
| Map<String, IFATransition> getPreciseMatchTransition(IFAState state); |
| |
| /** |
| * @param state the source state of the returned transitions |
| * @return transitions, that the given state has and only match one specified event rather than |
| * batch events |
| */ |
| Iterator<IFATransition> getPreciseMatchTransitionIterator(IFAState state); |
| |
| /** |
| * @param state state the source state of the returned transitions |
| * @return transitions, that the given state has and can match batch events |
| */ |
| Iterator<IFATransition> getFuzzyMatchTransitionIterator(IFAState state); |
| |
| /** |
| * @param state state the source state of the returned transitions |
| * @return num of transitions, that the given state has and can match batch events |
| */ |
| int getFuzzyMatchTransitionSize(IFAState state); |
| |
| /** |
| * @param sourceState source state |
| * @param transition transition that the source state has |
| * @return next state |
| */ |
| IFAState getNextState(IFAState sourceState, IFATransition transition); |
| |
| /** |
| * @return the initial state of this FA |
| */ |
| IFAState getInitialState(); |
| |
| /** |
| * @return the size of states this FA has |
| */ |
| int getStateSize(); |
| |
| /** |
| * @param index the index of the target state, used for uniquely identifying states in FA |
| * @return the state identified by given index |
| */ |
| IFAState getState(int index); |
| |
| /** |
| * Determines if there is overlap between the state transfer events of this FA. If it returns |
| * true, then there may be overlap. If it returns false, there must be no overlap. |
| * |
| * @return may transition overlap |
| */ |
| boolean mayTransitionOverlap(); |
| |
| final class Builder { |
| private PartialPath pathPattern; |
| private PathPatternTree patternTree; |
| private boolean isPrefixMatch = false; |
| |
| public Builder() {} |
| |
| public Builder pattern(PartialPath pattern) { |
| this.pathPattern = pattern; |
| return this; |
| } |
| |
| /** |
| * @param patternTree the included PartialPath must be a prefix or a fullPath |
| */ |
| public Builder patternTree(PathPatternTree patternTree) { |
| this.patternTree = patternTree; |
| return this; |
| } |
| |
| public Builder isPrefixMatch(boolean isPrefixMatch) { |
| this.isPrefixMatch = isPrefixMatch; |
| return this; |
| } |
| |
| public PartialPath getPathPattern() { |
| return pathPattern; |
| } |
| |
| public PathPatternTree getPatternTree() { |
| return patternTree; |
| } |
| |
| public boolean isPrefixMatch() { |
| return isPrefixMatch; |
| } |
| |
| public IPatternFA buildNFA() { |
| return FAFactory.getInstance().constructNFA(this); |
| } |
| |
| public IPatternFA buildDFA() { |
| return FAFactory.getInstance().constructDFA(this); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| Builder builder = (Builder) o; |
| return isPrefixMatch == builder.isPrefixMatch |
| && Objects.equals(pathPattern, builder.pathPattern) |
| && Objects.equals(patternTree, builder.patternTree); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(pathPattern, patternTree, isPrefixMatch); |
| } |
| } |
| } |