// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// 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.
// * Neither the name of Google Inc. nor the names of its
// 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
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package com.google.protobuf;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static java.util.Arrays.asList;
import java.util.ArrayList;
import java.util.Collections;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link LazyStringArrayList}. */
@RunWith(JUnit4.class)
public class LazyStringArrayListTest {
private static final String STRING_A = "A";
private static final String STRING_B = "B";
private static final String STRING_C = "C";
private static final ByteString BYTE_STRING_A = ByteString.copyFromUtf8("A");
private static final ByteString BYTE_STRING_B = ByteString.copyFromUtf8("B");
private static final ByteString BYTE_STRING_C = ByteString.copyFromUtf8("C");
@Test
public void testJustStrings() {
LazyStringArrayList list = new LazyStringArrayList();
list.add(STRING_A);
list.add(STRING_B);
list.add(STRING_C);
assertThat(list).hasSize(3);
assertThat(list.get(0)).isSameInstanceAs(STRING_A);
assertThat(list.get(1)).isSameInstanceAs(STRING_B);
assertThat(list.get(2)).isSameInstanceAs(STRING_C);
list.set(1, STRING_C);
assertThat(list.get(1)).isSameInstanceAs(STRING_C);
list.remove(1);
assertThat(list.get(0)).isSameInstanceAs(STRING_A);
assertThat(list.get(1)).isSameInstanceAs(STRING_C);
List<ByteString> byteStringList = list.asByteStringList();
assertThat(byteStringList.get(0)).isEqualTo(BYTE_STRING_A);
assertThat(byteStringList.get(1)).isEqualTo(BYTE_STRING_C);
// Underlying list should be transformed.
assertThat(byteStringList.get(0)).isSameInstanceAs(list.getByteString(0));
assertThat(byteStringList.get(1)).isSameInstanceAs(list.getByteString(1));
}
@Test
public void testJustByteString() {
LazyStringArrayList list = new LazyStringArrayList();
list.add(BYTE_STRING_A);
list.add(BYTE_STRING_B);
list.add(BYTE_STRING_C);
assertThat(list).hasSize(3);
assertThat(list.getByteString(0)).isSameInstanceAs(BYTE_STRING_A);
assertThat(list.getByteString(1)).isSameInstanceAs(BYTE_STRING_B);
assertThat(list.getByteString(2)).isSameInstanceAs(BYTE_STRING_C);
list.remove(1);
assertThat(list.getByteString(0)).isSameInstanceAs(BYTE_STRING_A);
assertThat(list.getByteString(1)).isSameInstanceAs(BYTE_STRING_C);
List<ByteString> byteStringList = list.asByteStringList();
assertThat(byteStringList.get(0)).isSameInstanceAs(BYTE_STRING_A);
assertThat(byteStringList.get(1)).isSameInstanceAs(BYTE_STRING_C);
}
@Test
public void testConversionBackAndForth() {
LazyStringArrayList list = new LazyStringArrayList();
list.add(STRING_A);
list.add(BYTE_STRING_B);
list.add(BYTE_STRING_C);
// String a should be the same because it was originally a string
assertThat(list.get(0)).isSameInstanceAs(STRING_A);
// String b and c should be different because the string has to be computed
// from the ByteString
String bPrime = list.get(1);
assertThat(bPrime).isNotSameInstanceAs(STRING_B);
assertThat(bPrime).isEqualTo(STRING_B);
String cPrime = list.get(2);
assertThat(cPrime).isNotSameInstanceAs(STRING_C);
assertThat(cPrime).isEqualTo(STRING_C);
// String c and c should stay the same once cached.
assertThat(list.get(1)).isSameInstanceAs(bPrime);
assertThat(list.get(2)).isSameInstanceAs(cPrime);
// ByteString needs to be computed from string for both a and b
ByteString aPrimeByteString = list.getByteString(0);
assertThat(aPrimeByteString).isEqualTo(BYTE_STRING_A);
ByteString bPrimeByteString = list.getByteString(1);
assertThat(bPrimeByteString).isNotSameInstanceAs(BYTE_STRING_B);
assertThat(list.getByteString(1)).isEqualTo(BYTE_STRING_B);
// Once cached, ByteString should stay cached.
assertThat(list.getByteString(0)).isSameInstanceAs(aPrimeByteString);
assertThat(list.getByteString(1)).isSameInstanceAs(bPrimeByteString);
}
@Test
public void testCopyConstructorCopiesByReference() {
LazyStringArrayList list1 = new LazyStringArrayList();
list1.add(STRING_A);
list1.add(BYTE_STRING_B);
list1.add(BYTE_STRING_C);
LazyStringArrayList list2 = new LazyStringArrayList(list1);
assertThat(list2).hasSize(3);
assertThat(list2.get(0)).isSameInstanceAs(STRING_A);
assertThat(list2.getByteString(1)).isSameInstanceAs(BYTE_STRING_B);
assertThat(list2.getByteString(2)).isSameInstanceAs(BYTE_STRING_C);
}
@Test
public void testListCopyConstructor() {
List<String> list1 = new ArrayList<>();
list1.add(STRING_A);
list1.add(STRING_B);
list1.add(STRING_C);
LazyStringArrayList list2 = new LazyStringArrayList(list1);
assertThat(list2).hasSize(3);
assertThat(list2.get(0)).isSameInstanceAs(STRING_A);
assertThat(list2.get(1)).isSameInstanceAs(STRING_B);
assertThat(list2.get(2)).isSameInstanceAs(STRING_C);
}
@Test
public void testAddAllCopiesByReferenceIfPossible() {
LazyStringArrayList list1 = new LazyStringArrayList();
list1.add(STRING_A);
list1.add(BYTE_STRING_B);
list1.add(BYTE_STRING_C);
LazyStringArrayList list2 = new LazyStringArrayList();
list2.addAll(list1);
assertThat(list2).hasSize(3);
assertThat(list2.get(0)).isSameInstanceAs(STRING_A);
assertThat(list2.getByteString(1)).isSameInstanceAs(BYTE_STRING_B);
assertThat(list2.getByteString(2)).isSameInstanceAs(BYTE_STRING_C);
}
@Test
public void testModificationWithIteration() {
LazyStringArrayList list = new LazyStringArrayList();
list.addAll(asList(STRING_A, STRING_B, STRING_C));
Iterator<String> iterator = list.iterator();
assertThat(list).hasSize(3);
assertThat(list.get(0)).isEqualTo(STRING_A);
assertThat(iterator.next()).isSameInstanceAs(STRING_A);
// Does not structurally modify.
iterator = list.iterator();
list.set(0, STRING_B);
iterator.next();
list.remove(0);
try {
iterator.next();
assertWithMessage("expected exception").fail();;
} catch (ConcurrentModificationException e) {
// expected
}
iterator = list.iterator();
list.add(0, STRING_C);
try {
iterator.next();
assertWithMessage("expected exception").fail();;
} catch (ConcurrentModificationException e) {
// expected
}
}
@Test
public void testMakeImmutable() {
LazyStringArrayList list = new LazyStringArrayList();
list.add(STRING_A);
list.add(STRING_B);
list.add(STRING_C);
list.makeImmutable();
assertGenericListImmutable(list, STRING_A);
// LazyStringArrayList has extra methods not covered in the generic
// assertion.
try {
list.add(BYTE_STRING_A.toByteArray());
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.add(BYTE_STRING_A);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.addAllByteArray(Collections.singletonList(BYTE_STRING_A.toByteArray()));
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.addAllByteString(asList(BYTE_STRING_A));
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.mergeFrom(new LazyStringArrayList());
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.set(0, BYTE_STRING_A.toByteArray());
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.set(0, BYTE_STRING_A);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
}
@Test
public void testImmutabilityPropagation() {
LazyStringArrayList list = new LazyStringArrayList();
list.add(STRING_A);
list.makeImmutable();
assertGenericListImmutable(list.asByteStringList(), BYTE_STRING_A);
// Arrays use reference equality so need to retrieve the underlying value
// to properly test deep immutability.
List<byte[]> byteArrayList = list.asByteArrayList();
assertGenericListImmutable(byteArrayList, byteArrayList.get(0));
}
private static <T> void assertGenericListImmutable(List<T> list, T value) {
try {
list.add(value);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.add(0, value);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.addAll(asList(value));
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.addAll(0, asList(value));
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.clear();
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.remove(0);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.remove(value);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.removeAll(asList(value));
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.retainAll(asList());
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.retainAll(asList());
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
try {
list.set(0, value);
assertWithMessage("expected exception").fail();;
} catch (UnsupportedOperationException e) {
// expected
}
}
}
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