| /* |
| * 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.nifi.toolkit.tls.configuration; |
| |
| import org.apache.nifi.util.StringUtils; |
| |
| import java.util.Comparator; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.regex.Pattern; |
| import java.util.stream.Collectors; |
| import java.util.stream.IntStream; |
| import java.util.stream.Stream; |
| |
| /** |
| * Each instance is uniquely identified by its hostname and instance number |
| */ |
| public class InstanceIdentifier { |
| public static final Comparator<InstanceIdentifier> HOST_IDENTIFIER_COMPARATOR = (o1, o2) -> { |
| int i = o1.getHostname().compareTo(o2.getHostname()); |
| if (i == 0) { |
| return o1.getNumber() - o2.getNumber(); |
| } |
| return i; |
| }; |
| private static final Pattern RANGE_PATTERN = Pattern.compile("^[0-9]+(-[0-9]+)?$"); |
| private final String hostname; |
| private final int number; |
| |
| public InstanceIdentifier(String hostname, int number) { |
| this.hostname = hostname; |
| this.number = number; |
| } |
| |
| /** |
| * Creates a map that can be used to deterministically assign global instance numbers |
| * |
| * @param hostnameExpressions the hostname expressions to expand |
| * @return a map that can be used to deterministically assign global instance numbers |
| */ |
| public static Map<InstanceIdentifier, Integer> createOrderMap(Stream<String> hostnameExpressions) { |
| List<InstanceIdentifier> instanceIdentifiers = createIdentifiers(hostnameExpressions).sorted(HOST_IDENTIFIER_COMPARATOR).collect(Collectors.toList()); |
| Map<InstanceIdentifier, Integer> result = new HashMap<>(); |
| for (int i = 0; i < instanceIdentifiers.size(); i++) { |
| result.put(instanceIdentifiers.get(i), i + 1); |
| } |
| return result; |
| } |
| |
| /** |
| * Creates a stream of hostname identifiers from a stream of hostname expressions |
| * |
| * @param hostnameExpressions the hostname expressions |
| * @return the hostname identifiers |
| */ |
| public static Stream<InstanceIdentifier> createIdentifiers(Stream<String> hostnameExpressions) { |
| return hostnameExpressions.flatMap(hostnameExpression -> extractHostnames(hostnameExpression).flatMap(hostname -> { |
| ExtractedRange extractedRange = new ExtractedRange(hostname, '(', ')'); |
| if (extractedRange.range == null) { |
| return Stream.of(new InstanceIdentifier(hostname, 1)); |
| } |
| if (!StringUtils.isEmpty(extractedRange.afterClose)) { |
| throw new IllegalArgumentException("No characters expected after )"); |
| } |
| return extractedRange.range.map(numString -> new InstanceIdentifier(extractedRange.beforeOpen, Integer.parseInt(numString))); |
| })); |
| } |
| |
| protected static Stream<String> extractHostnames(String hostname) { |
| ExtractedRange extractedRange = new ExtractedRange(hostname, '[', ']'); |
| if (extractedRange.range == null) { |
| return Stream.of(hostname); |
| } |
| return extractedRange.range.map(s -> extractedRange.beforeOpen + s + extractedRange.afterClose).flatMap(InstanceIdentifier::extractHostnames); |
| } |
| |
| private static Stream<String> extractRange(String range) { |
| if (!RANGE_PATTERN.matcher(range).matches()) { |
| throw new IllegalArgumentException("Expected either one number or two separated by a single hyphen"); |
| } |
| String[] split = range.split("-"); |
| if (split.length == 1) { |
| String prefix = "1-"; |
| if (split[0].charAt(0) == '0') { |
| prefix = String.format("%0" + split[0].length() + "d-", 1); |
| } |
| return extractRange(prefix + split[0]); |
| } else { |
| int baseLength = split[0].length(); |
| int low = Integer.parseInt(split[0]); |
| String padding = split[0].substring(0, split[0].length() - Integer.toString(low).length()); |
| int high = Integer.parseInt(split[1]); |
| IntStream intRange = IntStream.range(Math.min(low, high), Math.max(low, high) + 1) |
| .map(i -> high < low ? high - i + low : i); |
| return intRange.mapToObj(i -> { |
| String s = Integer.toString(i); |
| int length = s.length(); |
| if (length >= baseLength) { |
| return s; |
| } else { |
| return padding.substring(0, baseLength - length) + s; |
| } |
| }); |
| } |
| } |
| |
| public String getHostname() { |
| return hostname; |
| } |
| |
| public int getNumber() { |
| return number; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| InstanceIdentifier that = (InstanceIdentifier) o; |
| |
| if (number != that.number) return false; |
| return hostname != null ? hostname.equals(that.hostname) : that.hostname == null; |
| |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = hostname != null ? hostname.hashCode() : 0; |
| result = 31 * result + number; |
| return result; |
| } |
| |
| private static class ExtractedRange { |
| private final String beforeOpen; |
| private final Stream<String> range; |
| private final String afterClose; |
| |
| public ExtractedRange(String string, char rangeOpen, char rangeClose) { |
| int openBracket = string.indexOf(rangeOpen); |
| if (openBracket >= 0) { |
| int closeBracket = string.indexOf(rangeClose, openBracket); |
| if (closeBracket < 0) { |
| throw new IllegalArgumentException("Unable to find matching " + rangeClose + " for " + rangeOpen + " in " + string); |
| } |
| beforeOpen = string.substring(0, openBracket); |
| if (closeBracket + 1 < string.length()) { |
| afterClose = string.substring(closeBracket + 1); |
| } else { |
| afterClose = ""; |
| } |
| range = extractRange(string.substring(openBracket + 1, closeBracket)); |
| } else { |
| beforeOpen = string; |
| range = null; |
| afterClose = ""; |
| } |
| } |
| } |
| } |