/*
    * 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 static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Collections;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.file.AccumulatorPathVisitor;
  import org.apache.commons.io.file.CounterAssertions;
  import org.apache.commons.io.file.Counters;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link DirectoryFileFilter}.
   */
  public class DirectoryFileFilterTest {
  
      /**
       * Javadoc example.
       *
       * System.out calls are commented out here but not in the Javadoc.
       */
      @Test
      public void testJavadocExampleUsingIo() {
          final File dir = FileUtils.current();
          final String[] files = dir.list(DirectoryFileFilter.INSTANCE);
          // End of Javadoc example
          assertTrue(files.length > 0);
      }
  
      /**
       * Javadoc example.
       *
       * System.out calls are commented out here but not in the Javadoc.
       */
      @Test
      public void testJavadocExampleUsingNio() throws IOException {
          final Path dir = Paths.get("");
          final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(DirectoryFileFilter.INSTANCE,
              TrueFileFilter.INSTANCE);
          //
          // Walk one dir
          Files.walkFileTree(dir, Collections.emptySet(), 1, visitor);
          // System.out.println(visitor.getPathCounters());
          // System.out.println(visitor.getFileList());
          //
          visitor.getPathCounters().reset();
          //
          // Walk dir tree
          Files.walkFileTree(dir, visitor);
          // System.out.println(visitor.getPathCounters());
          // System.out.println(visitor.getDirList());
          // System.out.println(visitor.getFileList());
          //
          // End of Javadoc example
          assertEquals(0, visitor.getPathCounters().getFileCounter().get());
          assertTrue(visitor.getPathCounters().getDirectoryCounter().get() > 0);
          assertEquals(0, visitor.getPathCounters().getByteCounter().get());
          // We counted and accumulated
          assertFalse(visitor.getDirList().isEmpty());
          assertFalse(visitor.getFileList().isEmpty());
          //
          assertNotEquals(Counters.noopPathCounters(), visitor.getPathCounters());
          visitor.getPathCounters().reset();
          CounterAssertions.assertZeroCounters(visitor.getPathCounters());
      }
  
  }