content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
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  // modification, are permitted provided that the following conditions are
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  //
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  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
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  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import static java.util.Arrays.asList;
  
  import com.google.protobuf.Internal.DoubleList;
  import java.util.Collections;
  import java.util.ConcurrentModificationException;
  import java.util.Iterator;
  import junit.framework.TestCase;
  
  /**
   * Tests for {@link DoubleArrayList}.
   *
   * @author dweis@google.com (Daniel Weis)
   */
  public class DoubleArrayListTest extends TestCase {
  
    private static final DoubleArrayList UNARY_LIST = newImmutableDoubleArrayList(1);
    private static final DoubleArrayList TERTIARY_LIST = newImmutableDoubleArrayList(1, 2, 3);
  
    private DoubleArrayList list;
  
    @Override
    protected void setUp() throws Exception {
      list = new DoubleArrayList();
    }
  
    public void testEmptyListReturnsSameInstance() {
      assertSame(DoubleArrayList.emptyList(), DoubleArrayList.emptyList());
    }
  
    public void testEmptyListIsImmutable() {
      assertImmutable(DoubleArrayList.emptyList());
    }
  
    public void testMakeImmutable() {
      list.addDouble(3);
      list.addDouble(4);
      list.addDouble(5);
      list.addDouble(7);
      list.makeImmutable();
      assertImmutable(list);
    }
  
    public void testModificationWithIteration() {
      list.addAll(asList(1D, 2D, 3D, 4D));
      Iterator<Double> iterator = list.iterator();
      assertEquals(4, list.size());
      assertEquals(1D, (double) list.get(0), 0.0);
      assertEquals(1D, (double) iterator.next(), 0.0);
      list.set(0, 1D);
      assertEquals(2D, (double) iterator.next(), 0.0);
  
      list.remove(0);
      try {
        iterator.next();
        fail();
      } catch (ConcurrentModificationException e) {
        // expected
      }
  
      iterator = list.iterator();
      list.add(0, 0D);
      try {
        iterator.next();
        fail();
      } catch (ConcurrentModificationException e) {
        // expected
      }
    }
  
    public void testGet() {
      assertEquals(1D, (double) TERTIARY_LIST.get(0), 0.0);
      assertEquals(2D, (double) TERTIARY_LIST.get(1), 0.0);
      assertEquals(3D, (double) TERTIARY_LIST.get(2), 0.0);
  
      try {
        TERTIARY_LIST.get(-1);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
  
      try {
        TERTIARY_LIST.get(3);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
    }
  
    public void testGetDouble() {
      assertEquals(1D, TERTIARY_LIST.getDouble(0), 0.0);
      assertEquals(2D, TERTIARY_LIST.getDouble(1), 0.0);
      assertEquals(3D, TERTIARY_LIST.getDouble(2), 0.0);
  
      try {
        TERTIARY_LIST.get(-1);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
  
      try {
        TERTIARY_LIST.get(3);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
    }
  
    public void testSize() {
      assertEquals(0, DoubleArrayList.emptyList().size());
      assertEquals(1, UNARY_LIST.size());
      assertEquals(3, TERTIARY_LIST.size());
  
      list.addDouble(3);
      list.addDouble(4);
      list.addDouble(6);
      list.addDouble(8);
      assertEquals(4, list.size());
  
      list.remove(0);
      assertEquals(3, list.size());
  
      list.add(17D);
      assertEquals(4, list.size());
    }
  
    public void testSet() {
      list.addDouble(2);
      list.addDouble(4);
  
      assertEquals(2D, (double) list.set(0, 3D), 0.0);
      assertEquals(3D, list.getDouble(0), 0.0);
  
      assertEquals(4D, (double) list.set(1, 0D), 0.0);
      assertEquals(0D, list.getDouble(1), 0.0);
  
      try {
        list.set(-1, 0D);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
  
      try {
        list.set(2, 0D);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
    }
  
    public void testSetDouble() {
      list.addDouble(1);
      list.addDouble(3);
  
      assertEquals(1D, list.setDouble(0, 0), 0.0);
      assertEquals(0D, list.getDouble(0), 0.0);
  
      assertEquals(3D, list.setDouble(1, 0), 0.0);
      assertEquals(0D, list.getDouble(1), 0.0);
  
      try {
        list.setDouble(-1, 0);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
  
      try {
        list.setDouble(2, 0);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
    }
  
    public void testAdd() {
      assertEquals(0, list.size());
  
      assertTrue(list.add(2D));
      assertEquals(asList(2D), list);
  
      assertTrue(list.add(3D));
      list.add(0, 4D);
      assertEquals(asList(4D, 2D, 3D), list);
  
      list.add(0, 1D);
      list.add(0, 0D);
      // Force a resize by getting up to 11 elements.
      for (int i = 0; i < 6; i++) {
        list.add(Double.valueOf(5 + i));
      }
      assertEquals(asList(0D, 1D, 4D, 2D, 3D, 5D, 6D, 7D, 8D, 9D, 10D), list);
  
      try {
        list.add(-1, 5D);
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
  
      try {
        list.add(4, 5D);
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
    }
  
    public void testAddDouble() {
      assertEquals(0, list.size());
  
      list.addDouble(2);
      assertEquals(asList(2D), list);
  
      list.addDouble(3);
      assertEquals(asList(2D, 3D), list);
    }
  
    public void testAddAll() {
      assertEquals(0, list.size());
  
      assertTrue(list.addAll(Collections.singleton(1D)));
      assertEquals(1, list.size());
      assertEquals(1D, (double) list.get(0), 0.0);
      assertEquals(1D, list.getDouble(0), 0.0);
  
      assertTrue(list.addAll(asList(2D, 3D, 4D, 5D, 6D)));
      assertEquals(asList(1D, 2D, 3D, 4D, 5D, 6D), list);
  
      assertTrue(list.addAll(TERTIARY_LIST));
      assertEquals(asList(1D, 2D, 3D, 4D, 5D, 6D, 1D, 2D, 3D), list);
  
      assertFalse(list.addAll(Collections.<Double>emptyList()));
      assertFalse(list.addAll(DoubleArrayList.emptyList()));
    }
  
    public void testEquals() {
      DoubleArrayList list1 = new DoubleArrayList();
      DoubleArrayList list2 = new DoubleArrayList();
  
      list1.addDouble(Double.longBitsToDouble(0x7ff0000000000001L));
      list2.addDouble(Double.longBitsToDouble(0x7ff0000000000002L));
      assertEquals(list1, list2);
    }
  
    public void testRemove() {
      list.addAll(TERTIARY_LIST);
      assertEquals(1D, (double) list.remove(0), 0.0);
      assertEquals(asList(2D, 3D), list);
  
      assertTrue(list.remove(Double.valueOf(3)));
      assertEquals(asList(2D), list);
  
      assertFalse(list.remove(Double.valueOf(3)));
      assertEquals(asList(2D), list);
  
      assertEquals(2D, (double) list.remove(0), 0.0);
      assertEquals(asList(), list);
  
      try {
        list.remove(-1);
        fail();
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
  
      try {
        list.remove(0);
      } catch (IndexOutOfBoundsException e) {
        // expected
      }
    }
  
    public void testRemoveEnd_listAtCapacity() {
      DoubleList toRemove = DoubleArrayList.emptyList().mutableCopyWithCapacity(1);
      toRemove.addDouble(3);
      toRemove.remove(0);
      assertEquals(0, toRemove.size());
    }
  
    public void testRemove_listAtCapacity() {
      DoubleList toRemove = DoubleArrayList.emptyList().mutableCopyWithCapacity(2);
      toRemove.addDouble(3);
      toRemove.addDouble(4);
      toRemove.remove(0);
      assertEquals(1, toRemove.size());
      assertEquals(4D, (double) toRemove.get(0));
    }
  
    public void testSublistRemoveEndOfCapacity() {
      DoubleList toRemove = DoubleArrayList.emptyList().mutableCopyWithCapacity(1);
      toRemove.addDouble(3);
      toRemove.subList(0, 1).clear();
      assertEquals(0, toRemove.size());
    }
  
    private void assertImmutable(DoubleList list) {
      if (list.contains(1D)) {
        throw new RuntimeException("Cannot test the immutability of lists that contain 1.");
      }
  
      try {
        list.add(1D);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.add(0, 1D);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(Collections.<Double>emptyList());
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(Collections.singletonList(1D));
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(new DoubleArrayList());
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(UNARY_LIST);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(0, Collections.singleton(1D));
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(0, UNARY_LIST);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addAll(0, Collections.<Double>emptyList());
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.addDouble(0);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.clear();
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.remove(1);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.remove(new Object());
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.removeAll(Collections.<Double>emptyList());
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.removeAll(Collections.singleton(1D));
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.removeAll(UNARY_LIST);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.retainAll(Collections.<Double>emptyList());
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.retainAll(Collections.singleton(1D));
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.retainAll(UNARY_LIST);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.set(0, 0D);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
  
      try {
        list.setDouble(0, 0);
        fail();
      } catch (UnsupportedOperationException e) {
        // expected
      }
    }
  
    private static DoubleArrayList newImmutableDoubleArrayList(double... elements) {
      DoubleArrayList list = new DoubleArrayList();
      for (double element : elements) {
        list.addDouble(element);
      }
      list.makeImmutable();
      return list;
    }
  }
  