third_party/aws-sdk-auth-lite/src/main/java/com/amazonaws/util/StringUtils.java

/*
 * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (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/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.util;

import java.nio.charset.Charset;

/**
 * Utilities for converting objects to strings.
 */
public class StringUtils {

    private static final String DEFAULT_ENCODING = "UTF-8";

    public static final Charset UTF8 = Charset.forName(DEFAULT_ENCODING);

    /**
     * A null-safe trim method. If the input string is null, returns null;
     * otherwise returns a trimmed version of the input.
     */
    public static String trim(String value) {
        if (value == null) {
            return null;
        }
        return value.trim();
    }

    /**
     * @return true if the given value is either null or the empty string
     */
    public static boolean isNullOrEmpty(String value) {
        return value == null || value.isEmpty();
    }
}