/*
 * 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.fluss.utils;

import java.util.Arrays;

/** Utility class to convert objects into strings in vice-versa. */
public class StringUtils {
    /**
     * Checks if the string is null, empty, or contains only whitespace characters. A whitespace
     * character is defined via {@link Character#isWhitespace(char)}.
     *
     * @param str The string to check
     * @return True, if the string is null or blank, false otherwise.
     */
    public static boolean isNullOrWhitespaceOnly(String str) {
        if (str == null || str.isEmpty()) {
            return true;
        }

        final int len = str.length();
        for (int i = 0; i < len; i++) {
            if (!Character.isWhitespace(str.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * Converts the given object into a string representation by calling {@link Object#toString()}
     * and formatting (possibly nested) arrays and {@code null}.
     *
     * <p>See {@link Arrays#deepToString(Object[])} for more information about the used format.
     */
    public static String arrayAwareToString(Object o) {
        final String arrayString = Arrays.deepToString(new Object[] {o});
        return arrayString.substring(1, arrayString.length() - 1);
    }
}
