/*
    * Copyright (C) 2007 The Guava Authors
    *
    * Licensed 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 com.google.common.collect;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import com.google.common.annotations.GwtCompatible;
  
  import junit.framework.TestCase;
  
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Unit test for {@code ObjectArrays}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  public class ObjectArraysTest extends TestCase {
  
    public void testNewArray_fromArray_Empty() {
      String[] in = new String[0];
      String[] empty = ObjectArrays.newArray(in, 0);
      assertEquals(0, empty.length);
    }
  
    public void testNewArray_fromArray_Nonempty() {
      String[] array = ObjectArrays.newArray(new String[0], 2);
      assertEquals(String[].class, array.getClass());
      assertEquals(2, array.length);
      assertNull(array[0]);
    }
  
    public void testNewArray_fromArray_OfArray() {
      String[][] array = ObjectArrays.newArray(new String[0][0], 1);
      assertEquals(String[][].class, array.getClass());
      assertEquals(1, array.length);
      assertNull(array[0]);
    }
  
    public void testToArrayImpl1() {
      doTestToArrayImpl1(Lists.<Integer>newArrayList());
      doTestToArrayImpl1(Lists.newArrayList(1));
      doTestToArrayImpl1(Lists.newArrayList(1, null, 3));
    }
  
    private void doTestToArrayImpl1(List<Integer> list) {
      Object[] reference = list.toArray();
      Object[] target = ObjectArrays.toArrayImpl(list);
      assertEquals(reference.getClass(), target.getClass());
      assertTrue(Arrays.equals(reference, target));
    }
  
    public void testToArrayImpl2() {
      doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[0], false);
      doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[1], true);
  
      doTestToArrayImpl2(Lists.newArrayList(1), new Integer[0], false);
      doTestToArrayImpl2(Lists.newArrayList(1), new Integer[1], true);
      doTestToArrayImpl2(Lists.newArrayList(1), new Integer[] { 2, 3 }, true);
  
      doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[0], false);
      doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[2], false);
      doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[3], true);
    }
  
    private void doTestToArrayImpl2(List<Integer> list, Integer[] array1,
        boolean expectModify) {
      Integer[] starting = ObjectArrays.arraysCopyOf(array1, array1.length);
      Integer[] array2 = ObjectArrays.arraysCopyOf(array1, array1.length);
      Object[] reference = list.toArray(array1);
  
      Object[] target = ObjectArrays.toArrayImpl(list, array2);
  
      assertEquals(reference.getClass(), target.getClass());
      assertTrue(Arrays.equals(reference, target));
      assertTrue(Arrays.equals(reference, target));
  
      Object[] expectedArray1 = expectModify ? reference : starting;
      Object[] expectedArray2 = expectModify ? target : starting;
      assertTrue(Arrays.equals(expectedArray1, array1));
      assertTrue(Arrays.equals(expectedArray2, array2));
    }
  
   public void testPrependZeroElements() {
     String[] result = ObjectArrays.concat("foo", new String[] {});
     assertThat(result).asList().has().item("foo");
   }
 
   public void testPrependOneElement() {
     String[] result = ObjectArrays.concat("foo", new String[] { "bar" });
     assertThat(result).asList().has().exactly("foo", "bar").inOrder();
   }
 
   public void testPrependTwoElements() {
     String[] result = ObjectArrays.concat("foo", new String[] { "bar", "baz" });
     assertThat(result).asList().has().exactly("foo", "bar", "baz").inOrder();
   }
 
   public void testAppendZeroElements() {
     String[] result = ObjectArrays.concat(new String[] {}, "foo");
     assertThat(result).asList().has().item("foo");
   }
 
   public void testAppendOneElement() {
     String[] result = ObjectArrays.concat(new String[] { "foo" }, "bar");
     assertThat(result).asList().has().exactly("foo", "bar").inOrder();
   }
 
   public void testAppendTwoElements() {
     String[] result = ObjectArrays.concat(new String[] { "foo", "bar" }, "baz");
     assertThat(result).asList().has().exactly("foo", "bar", "baz").inOrder();
   }
 
   public void testEmptyArrayToEmpty() {
     doTestNewArrayEquals(new Object[0], 0);
   }
 
   public void testEmptyArrayToNonEmpty() {
     checkArrayEquals(new Long[5], ObjectArrays.newArray(new Long[0], 5));
   }
 
   public void testNonEmptyToShorter() {
     checkArrayEquals(new String[9], ObjectArrays.newArray(new String[10], 9));
   }
 
   public void testNonEmptyToSameLength() {
     doTestNewArrayEquals(new String[10], 10);
   }
 
   public void testNonEmptyToLonger() {
     checkArrayEquals(new String[10],
         ObjectArrays.newArray(new String[] { "a", "b", "c", "d", "e" }, 10));
   }
 
   private static void checkArrayEquals(Object[] expected, Object[] actual) {
     assertTrue("expected(" + expected.getClass() + "): " + Arrays.toString(expected)
         + " actual(" + actual.getClass() + "): " + Arrays.toString(actual),
         arrayEquals(expected, actual));
   }
 
   private static boolean arrayEquals(Object[] array1, Object[] array2) {
     assertSame(array1.getClass(), array2.getClass());
     return Arrays.equals(array1, array2);
   }
 
   private static void doTestNewArrayEquals(Object[] expected, int length) {
     checkArrayEquals(expected, ObjectArrays.newArray(expected, length));
   }
 }