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
   *
   *        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.causeway.commons.internal.base;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.junit.jupiter.api.Test;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  class NullSafeTest {
  
      @Test
      void streamAutodetect() throws Exception {
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new boolean[] {true, false})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new byte[] {1, 2})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new char[] {'1', '2'})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new short[] {1, 2})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new float[] {1.f, 2.f})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new double[] {1., 2.})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new int[] {1, 2})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new long[] {1L, 2L})
                  .count());
          
          assertEquals(2, 
                  _NullSafe.streamAutodetect(new String[] {"hi", "there"})
                  .count());
      }
      
      @Test
      void isEmptyString() throws Exception {
          assertThat(_NullSafe.isEmpty((String)null), is(true));
          assertThat(_NullSafe.isEmpty(""), is(true));
          assertThat(_NullSafe.isEmpty(" 12 aBc"), is(false));
      }
  
      @Test
      void isEmptyCollection() throws Exception {
          assertThat(_NullSafe.isEmpty((Collection<?>)null), is(true));
          assertThat(_NullSafe.isEmpty(Collections.emptyList()), is(true));
          assertThat(_NullSafe.isEmpty(Arrays.asList(new String[] {"foo", "bar"})), is(false));
      }
  
      @Test
      void absence() throws Exception {
          assertThat(_NullSafe.isAbsent(null), is(true));
          assertThat(_NullSafe.isAbsent(""), is(false));
      }
  
      @Test
      void presence() throws Exception {
          assertThat(_NullSafe.isPresent(null), is(false));
          assertThat(_NullSafe.isPresent(""), is(true));
      }
  
      @Test
      void emptyStreamWithArray() throws Exception {
  
          assertNotNull(_NullSafe.stream((String[])null));
  
          assertNotNull(_NullSafe.stream(_Strings.emptyArray));
          assertEquals(0L, _NullSafe.stream(_Strings.emptyArray).count());
      }
  
      @Test
      void streamWithArray() throws Exception {
          assertThat(
                  _NullSafe.stream(new String[] {"foo", "bar"})
                  .collect(Collectors.joining("|")),
                  is("foo|bar"));
      }
  
      @Test
      void emptyStreamWithCollection() throws Exception {
  
          assertNotNull(_NullSafe.stream((List<?>)null));
  
          assertNotNull(_NullSafe.stream(Arrays.asList(_Strings.emptyArray)));
          assertEquals(0L, _NullSafe.stream(Arrays.asList(_Strings.emptyArray)).count());
      }
  
      @Test
      void streamWithCollection() throws Exception {
          assertThat(
                  _NullSafe.stream(Arrays.asList(new String[] {"foo", "bar"}))
                  .collect(Collectors.joining("|")),
                  is("foo|bar"));
      }
  
      @Test
      void emptyStreamWithIterator() throws Exception {
  
          assertNotNull(_NullSafe.stream((Iterator<?>)null));
  
          assertNotNull(_NullSafe.stream(Arrays.asList(_Strings.emptyArray)).iterator());
          assertEquals(0L, _NullSafe.stream(Arrays.asList(_Strings.emptyArray).iterator()).count());
      }
  
      @Test
      void streamWithIterator() throws Exception {
          assertThat(
                  _NullSafe.stream(Arrays.asList(new String[] {"foo", "bar"}).iterator())
                  .collect(Collectors.joining("|")),
                  is("foo|bar"));
      }
  
  }
  