/* 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.zookeeper.common;
import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
public class StringUtils {
private StringUtils() {/** non instantiable and non inheritable **/}
/**
* This method returns an immutable List<String>, but different from String's split()
* it trims the results in the input String, and removes any empty string from
* the resulting List.
*
*/
public static List<String> split(String value, String separator) {
String[] splits = value.split(separator);
List<String> results = new ArrayList<String>();
for (int i = 0; i < splits.length; i++) {
splits[i] = splits[i].trim();
if (splits[i].length() > 0) {
results.add(splits[i]);
}
}
return Collections.unmodifiableList(results);
}
/**
* This method takes a List<String> and a delimiter and joins the strings
* into a single string, where the original strings are separated using
* the given delimiter.
*
*/
public static String joinStrings(List<String> list, String delim)
{
if (list == null)
return null;
StringBuilder builder = new StringBuilder(list.get(0));
for (String s : list.subList(1, list.size())) {
builder.append(delim).append(s);
}
return builder.toString();
}
}