| /* |
| * 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.drill.exec.coord.zk; |
| |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.parquet.Strings; |
| |
| import java.net.URL; |
| import java.util.Arrays; |
| import java.util.stream.Collectors; |
| |
| /** |
| * A convenience class used to expedite zookeeper paths manipulations. |
| */ |
| public final class PathUtils { |
| |
| /** |
| * Returns a normalized, combined path out of the given path segments. |
| * |
| * @param parts path segments to combine |
| * @see #normalize(String) |
| */ |
| public static String join(final String... parts) { |
| String path = Arrays.stream(parts) |
| .peek(part -> Preconditions.checkNotNull(part, "parts cannot contain null")) |
| .filter(part -> !Strings.isNullOrEmpty(part)) |
| .collect(Collectors.joining("/")); |
| return normalize(path); |
| } |
| |
| /** |
| * Normalizes the given path eliminating repeated forward slashes. |
| * |
| * @return normalized path |
| */ |
| public static String normalize(final String path) { |
| if (Strings.isNullOrEmpty(Preconditions.checkNotNull(path))) { |
| return path; |
| } |
| |
| final StringBuilder builder = new StringBuilder(); |
| char last = path.charAt(0); |
| builder.append(last); |
| for (int i=1; i<path.length(); i++) { |
| char cur = path.charAt(i); |
| if (last == '/' && cur == last) { |
| continue; |
| } |
| builder.append(cur); |
| last = cur; |
| } |
| return builder.toString(); |
| } |
| |
| /** |
| * Creates and returns path with the protocol at the beginning from specified {@code url}. |
| * |
| * @param url the source of path and protocol |
| * @return string with protocol and path divided by colon |
| */ |
| public static String getPathWithProtocol(URL url) { |
| if (url.getProtocol() != null) { |
| return url.getProtocol() + ":" + url.getPath(); |
| } else { |
| return url.getPath(); |
| } |
| } |
| } |