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.tools.ant.types.selectors;
  
  
  /**
   * This selector has one other selectors whose meaning it inverts. It
   * actually relies on NoneSelector for its implementation of the
   * isSelected() method, but it adds a check to ensure there is only one
   * other selector contained within.
   *
   * @since 1.5
   */
  public class NotSelector extends NoneSelector {
  
      /**
       * Default constructor.
       */
      public NotSelector() {
      }
  
      /**
       * Constructor that inverts the meaning of its argument.
       * @param other the selector to invert
       * @since Ant 1.7
       */
      public NotSelector(FileSelector other) {
          this();
          appendSelector(other);
      }
  
      /**
       * @return a string representation of the selector
       */
      public String toString() {
          StringBuilder buf = new StringBuilder();
          if (hasSelectors()) {
              buf.append("{notselect: ");
              buf.append(super.toString());
              buf.append("}");
          }
          return buf.toString();
      }
  
      /**
       * Makes sure that there is only one entry, sets an error message if
       * not.
       */
      public void verifySettings() {
          if (selectorCount() != 1) {
              setError(
                  "One and only one selector is allowed within the <not> tag");
          }
      }
  
  }
  
  