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/*
 * Copyright 2018 coldrye.eu, Carsten Klein
 *
 * 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 eu.coldrye.junit.util;

import java.util.Objects;

public final class StringUtils {

  public static final String EMPTY = "";

  /**
   * Returns a simplified string where all non alpha numerical ascii characters have been replaced by a single
   * underscore character.
   *
   * @param str
   * @return
   */
  public static String slug(String str) {

    String result = EMPTY;

    if (Objects.nonNull(str)) {

      result = str.replaceAll("[^a-zA-Z0-9]", "_");
      result = result.replaceAll("_+", "_");
    }

    return result;
  }

  // must not be instantiated
  private StringUtils() {

  }
}