/*

  * 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.commons.io.filefilter;

 import java.io.File;

 import java.io.Serializable;

 /**

  * This filter produces a logical NOT of the filters specified.

  *

  * @since 1.0

  * @version $Id: NotFileFilter.java 1471767 2013-04-24 23:24:19Z sebb $

  * @see FileFilterUtils#notFileFilter(IOFileFilter)

  */

 public class NotFileFilter extends AbstractFileFilter implements Serializable {

     /** The filter */

     private final IOFileFilter filter;

     /**

      * Constructs a new file filter that NOTs the result of another filter.

      *

      * @param filter  the filter, must not be null

      * @throws IllegalArgumentException if the filter is null

      */

     public NotFileFilter(final IOFileFilter filter) {

         if (filter == null) {

             throw new IllegalArgumentException("The filter must not be null");

         }

         this.filter = filter;

     }

     /**

      * Returns the logical NOT of the underlying filter's return value for the same File.

      *

      * @param file  the File to check

      * @return true if the filter returns false

      */

     @Override

     public boolean accept(final File file) {

         return ! filter.accept(file);

     }

     /**

      * Returns the logical NOT of the underlying filter's return value for the same arguments.

      *

      * @param file  the File directory

      * @param name  the filename

      * @return true if the filter returns false

      */

     @Override

     public boolean accept(final File file, final String name) {

         return ! filter.accept(file, name);

     }

     /**

      * Provide a String representaion of this file filter.

      *

      * @return a String representaion

      */

     @Override

     public String toString() {

         return super.toString() + "(" + filter.toString()  + ")";

     }

 }