/**
* Copyright 2013-2016 Amazon.com,
* Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Amazon Software License (the "License").
* You may not use this file except in compliance with the
* License. A copy of the License is located at
*
* http://aws.amazon.com/asl/
*
* or in the "license" file accompanying this file. This file is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, express or implied. See the License
* for the specific language governing permissions and
* limitations under the License.
*/
package com.amazonaws.mobileconnectors.cognito.internal.util;
import java.nio.charset.Charset;
/**
* A utility class of String objects.
*/
public final class StringUtils {
/**
* UTF-8 {@link Charset}
*/
private static final Charset UTF_8 = Charset.forName("UTF-8");
/**
* Calculates the byte length of a UTF-8 encoded string. 0 if the string is
* null.
*
* @param string string to be computed
* @return byte length of a UTF-8 string in bytes, 0 if null.
*/
public static long utf8ByteLength(String string) {
if (string == null) {
return 0;
}
return string.getBytes(UTF_8).length;
}
/**
* Checks whether a String is empty.
*
* @param string a string to check
* @return true if the string is null or empty, false otherwise
*/
public static boolean isEmpty(String string) {
return string == null || string.trim().isEmpty();
}
/**
* Compares two Strings. Returns true if both are null or have the same
* string value.
*
* @param s1 first string, can be null
* @param s2 second string, can be null
* @return true if both are null or have the same string value, false
* otherwise
*/
public static boolean equals(String s1, String s2) {
if (s1 == null) {
return s2 == null;
} else {
return s1.equals(s2);
}
}
}