content: /*
   *  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
   *
   *      https://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.ivy.core.cache;
  
  /**
   * Utility class providing some cache related facilities.
   *
   */
  public final class CacheUtil {
  
      /**
       * Checks that the given pattern is acceptable as a cache pattern
       *
       * @param cachePattern
       *            the pattern to check
       * @throws IllegalArgumentException
       *             if the pattern isn't acceptable as cache pattern
       */
      public static void checkCachePattern(String cachePattern) {
          if (cachePattern == null) {
              throw new IllegalArgumentException("null cache pattern not allowed.");
          }
          if (cachePattern.startsWith("..")) {
              throw new IllegalArgumentException("invalid cache pattern: '" + cachePattern
                      + "': cache patterns must not lead outside cache directory");
          }
          if (cachePattern.startsWith("/")) {
              throw new IllegalArgumentException("invalid cache pattern: '" + cachePattern
                      + "': cache patterns must not be absolute");
          }
      }
  
      private CacheUtil() {
      }
  }
  