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The SDK for simplifying the integration with wallee API.
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/**
* wallee SDK
*
* This library allows to interact with the wallee payment service.
*
* 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.wallee.sdk;

public class StringUtil {
  /**
   * Check if the given array contains the given value (with case-insensitive comparison).
   *
   * @param array The array
   * @param value The value to search
   * @return true if the array contains the value
   */
  public static boolean containsIgnoreCase(String[] array, String value) {
    for (String str : array) {
      if (value == null && str == null) return true;
      if (value != null && value.equalsIgnoreCase(str)) return true;
    }
    return false;
  }

  /**
   * Join an array of strings with the given separator.
   * 
   * Note: This might be replaced by utility method from commons-lang or guava someday
   * if one of those libraries is added as dependency.
   * 
   *
   * @param array     The array of strings
   * @param separator The separator
   * @return the resulting string
   */
  public static String join(String[] array, String separator) {
    int len = array.length;
    if (len == 0) return "";

    StringBuilder out = new StringBuilder();
    out.append(array[0]);
    for (int i = 1; i < len; i++) {
      out.append(separator).append(array[i]);
    }
    return out.toString();
  }

  /**
   * Trim string to null
   * @param str string to trim
   * @return trimmed string
   */
  public static String trimToNull(final String str) {
    final String ts = trim(str);
    return isEmpty(ts) ? null : ts;
  }

  private static String trim(final String str) {
    return str == null ? null : str.trim();
  }

  private static boolean isEmpty(final CharSequence cs) {
    return cs == null || cs.length() == 0;
  }
}