Coverage Report - org.apache.commons.io.comparator.ReverseComparator
 
Classes in this File Line Coverage Branch Coverage Complexity
ReverseComparator
87%
7/8
50%
1/2
1.667
 
 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  * 
 9  
  *      http://www.apache.org/licenses/LICENSE-2.0
 10  
  * 
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.commons.io.comparator;
 18  
 
 19  
 import java.io.File;
 20  
 import java.io.Serializable;
 21  
 import java.util.Comparator;
 22  
 
 23  
 /**
 24  
  * Reverses the result of comparing two objects using
 25  
  * the delegate {@link Comparator}.
 26  
  *
 27  
  * @version $Id: ReverseComparator.java 1642757 2014-12-01 21:09:30Z sebb $
 28  
  * @since 1.4
 29  
  */
 30  25
 class ReverseComparator extends AbstractFileComparator implements Serializable {
 31  
 
 32  
     private static final long serialVersionUID = -4808255005272229056L;
 33  
     private final Comparator<File> delegate;
 34  
 
 35  
     /**
 36  
      * Construct an instance with the sepecified delegate {@link Comparator}.
 37  
      *
 38  
      * @param delegate The comparator to delegate to
 39  
      */
 40  35
     public ReverseComparator(final Comparator<File> delegate) {
 41  35
         if (delegate == null) {
 42  0
             throw new IllegalArgumentException("Delegate comparator is missing");
 43  
         }
 44  35
         this.delegate = delegate;
 45  35
     }
 46  
 
 47  
     /**
 48  
      * Compare using the delegate Comparator, but reversing the result.
 49  
      * 
 50  
      * @param file1 The first file to compare
 51  
      * @param file2 The second file to compare
 52  
      * @return the result from the delegate {@link Comparator#compare(Object, Object)}
 53  
      * reversing the value (i.e. positive becomes negative and vice versa)
 54  
      */
 55  
     public int compare(final File file1, final File file2) {
 56  25
         return delegate.compare(file2, file1); // parameters switched round
 57  
     }
 58  
 
 59  
     /**
 60  
      * String representation of this file comparator.
 61  
      *
 62  
      * @return String representation of this file comparator
 63  
      */
 64  
     @Override
 65  
     public String toString() {
 66  8
         return super.toString() + "[" + delegate.toString() + "]";
 67  
     }
 68  
 
 69  
 }