wildfire chat server source initial submit
This commit is contained in:
heavyrain2012
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/*
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* Copyright (c) 2012-2017 The original author or authors
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* ------------------------------------------------------
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Apache License v2.0 which accompanies this distribution.
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*
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* The Eclipse Public License is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* The Apache License v2.0 is available at
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* http://www.opensource.org/licenses/apache2.0.php
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*
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* You may elect to redistribute this code under either of these licenses.
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*/
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package io.moquette.spi.impl.subscriptions;
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/**
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* Internal use only class.
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*/
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public class Token {
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static final Token EMPTY = new Token("");
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static final Token MULTI = new Token("#");
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static final Token SINGLE = new Token("+");
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final String name;
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protected Token(String s) {
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name = s;
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}
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protected String name() {
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return name;
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}
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protected boolean match(Token t) {
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if (t == MULTI || t == SINGLE) {
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return false;
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}
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if (this == MULTI || this == SINGLE) {
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return true;
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}
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return equals(t);
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}
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@Override
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public int hashCode() {
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int hash = 7;
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hash = 29 * hash + (this.name != null ? this.name.hashCode() : 0);
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return hash;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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if (getClass() != obj.getClass()) {
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return false;
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}
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final Token other = (Token) obj;
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if ((this.name == null) ? (other.name != null) : !this.name.equals(other.name)) {
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return false;
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}
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return true;
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}
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@Override
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public String toString() {
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return name;
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}
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}
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@@ -0,0 +1,183 @@
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/*
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* Copyright (c) 2012-2017 The original author or authors
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* ------------------------------------------------------
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Apache License v2.0 which accompanies this distribution.
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*
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* The Eclipse Public License is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* The Apache License v2.0 is available at
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* http://www.opensource.org/licenses/apache2.0.php
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*
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* You may elect to redistribute this code under either of these licenses.
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*/
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package io.moquette.spi.impl.subscriptions;
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import java.io.Serializable;
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import java.text.ParseException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Topic implements Serializable {
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private static final Logger LOG = LoggerFactory.getLogger(Topic.class);
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private static final long serialVersionUID = 2438799283749822L;
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private final String topic;
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private transient List<Token> tokens;
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private transient boolean valid;
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public Topic(String topic) {
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this.topic = topic;
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}
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public String getTopic() {
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return topic;
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}
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public List<Token> getTokens() {
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if (tokens == null) {
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try {
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tokens = parseTopic(topic);
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valid = true;
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} catch (ParseException e) {
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valid = false;
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LOG.error("Error parsing the topic: {}, message: {}", topic, e.getMessage());
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}
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}
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return tokens;
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}
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private List<Token> parseTopic(String topic) throws ParseException {
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List<Token> res = new ArrayList<>();
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String[] splitted = topic.split("/");
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if (splitted.length == 0) {
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res.add(Token.EMPTY);
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}
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if (topic.endsWith("/")) {
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// Add a fictious space
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String[] newSplitted = new String[splitted.length + 1];
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System.arraycopy(splitted, 0, newSplitted, 0, splitted.length);
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newSplitted[splitted.length] = "";
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splitted = newSplitted;
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}
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for (int i = 0; i < splitted.length; i++) {
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String s = splitted[i];
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if (s.isEmpty()) {
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// if (i != 0) {
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// throw new ParseException("Bad format of topic, expetec topic name between
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// separators", i);
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// }
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res.add(Token.EMPTY);
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} else if (s.equals("#")) {
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// check that multi is the last symbol
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if (i != splitted.length - 1) {
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throw new ParseException(
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"Bad format of topic, the multi symbol (#) has to be the last one after a separator",
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i);
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}
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res.add(Token.MULTI);
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} else if (s.contains("#")) {
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throw new ParseException("Bad format of topic, invalid subtopic name: " + s, i);
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} else if (s.equals("+")) {
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res.add(Token.SINGLE);
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} else if (s.contains("+")) {
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throw new ParseException("Bad format of topic, invalid subtopic name: " + s, i);
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} else {
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res.add(new Token(s));
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}
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}
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return res;
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}
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public boolean isValid() {
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if (tokens == null)
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getTokens();
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return valid;
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}
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/**
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* Verify if the 2 topics matching respecting the rules of MQTT Appendix A
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*
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* @param subscriptionTopic
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* the topic filter of the subscription
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* @return true if the two topics match.
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*/
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// TODO reimplement with iterators or with queues
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public boolean match(Topic subscriptionTopic) {
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List<Token> msgTokens = getTokens();
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List<Token> subscriptionTokens = subscriptionTopic.getTokens();
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int i = 0;
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for (; i < subscriptionTokens.size(); i++) {
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Token subToken = subscriptionTokens.get(i);
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if (subToken != Token.MULTI && subToken != Token.SINGLE) {
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if (i >= msgTokens.size()) {
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return false;
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}
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Token msgToken = msgTokens.get(i);
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if (!msgToken.equals(subToken)) {
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return false;
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}
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} else {
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if (subToken == Token.MULTI) {
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return true;
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}
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if (subToken == Token.SINGLE) {
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// skip a step forward
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}
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}
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}
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// if last token was a SINGLE then treat it as an empty
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// if (subToken == Token.SINGLE && (i - msgTokens.size() == 1)) {
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// i--;
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// }
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return i == msgTokens.size();
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}
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@Override
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public String toString() {
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return topic;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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if (getClass() != obj.getClass()) {
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return false;
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}
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Topic other = (Topic) obj;
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return Objects.equals(this.topic, other.topic);
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}
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@Override
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public int hashCode() {
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return topic.hashCode();
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}
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/**
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* Factory method
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* */
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public static Topic asTopic(String s) {
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return new Topic(s);
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}
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}
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