com.netflix.servo.util.Strings Maven / Gradle / Ivy
/*
* Copyright 2014 Netflix, Inc.
*
* Licensed 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 com.netflix.servo.util;
import java.util.Iterator;
/**
* Static helpers for {@code String} instances.
*/
public final class Strings {
private Strings() {
}
/**
* Returns true if the given string is null or is the empty string.
*/
public static boolean isNullOrEmpty(String string) {
return string == null || string.isEmpty();
}
/**
* Join the string representation of each part separated by the given separator string.
*
* @param separator Separator string. For example ","
* @param parts An iterator of the parts to join
* @return The string formed by joining each part separated by the given separator.
*/
public static String join(String separator, Iterator parts) {
Preconditions.checkNotNull(separator, "separator");
Preconditions.checkNotNull(parts, "parts");
StringBuilder builder = new StringBuilder();
if (parts.hasNext()) {
builder.append(parts.next().toString());
while (parts.hasNext()) {
builder.append(separator);
builder.append(parts.next().toString());
}
}
return builder.toString();
}
}