/**
* 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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 com.google.common.base.Preconditions;
import org.apache.parquet.Strings;
/**
* 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 final String join(final String... parts) {
final StringBuilder sb = new StringBuilder();
for (final String part:parts) {
Preconditions.checkNotNull(part, "parts cannot contain null");
if (!Strings.isNullOrEmpty(part)) {
sb.append(part).append("/");
}
}
if (sb.length() > 0) {
sb.deleteCharAt(sb.length() - 1);
}
final String path = sb.toString();
return normalize(path);
}
/**
* Normalizes the given path eliminating repeated forward slashes.
*
* @return normalized path
*/
public static final 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();
}
}