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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.collect.nestedset;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.testutil.MoreAsserts;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link com.google.devtools.build.lib.collect.nestedset.NestedSetView}. */
@RunWith(JUnit4.class)
public class NestedSetViewTest {
@Test
public void testIdentifier() {
NestedSet<String> inner = NestedSetBuilder.<String>stableOrder().add("a").add("b").build();
NestedSet<String> outer =
NestedSetBuilder.<String>stableOrder().addTransitive(inner).add("c").build();
NestedSet<String> flat =
NestedSetBuilder.<String>stableOrder().add("a").add("b").add("c").build();
// The identifier should be independent of the view instance.
assertThat((new NestedSetView<String>(inner)).identifier())
.isEqualTo((new NestedSetView<String>(inner)).identifier());
// Sets with different internal structure should have different identifiers
assertThat((new NestedSetView<String>(flat)).identifier())
.isNotEqualTo((new NestedSetView<String>(outer)).identifier());
// Decomposing a set, the transitive sets should be correctly identified.
Set<NestedSetView<String>> transitives = (new NestedSetView<String>(outer)).transitives();
assertThat(transitives).hasSize(1);
NestedSetView<String> extracted = transitives.iterator().next();
assertThat(extracted.identifier()).isEqualTo((new NestedSetView<String>(inner)).identifier());
}
@Test
public void testDirects() {
NestedSet<String> inner = NestedSetBuilder.<String>stableOrder().add("a").add("b").build();
NestedSet<String> outer =
NestedSetBuilder.<String>stableOrder()
.add("c")
.addTransitive(inner)
.add("d")
.add("e")
.build();
// The direct members should correctly be identified.
assertThat((new NestedSetView<String>(outer)).directs()).containsExactly("c", "d", "e");
}
@Test
public void testTransitives() {
// The inner sets have to have at least two elements, as NestedSet may decide to inline
// singleton sets; however, we do not want to assert the inlining in the test.
NestedSet<String> innerA = NestedSetBuilder.<String>stableOrder().add("a1").add("a2").build();
NestedSet<String> innerB = NestedSetBuilder.<String>stableOrder().add("b1").add("b2").build();
NestedSet<String> innerC = NestedSetBuilder.<String>stableOrder().add("c1").add("c2").build();
NestedSet<String> outer =
NestedSetBuilder.<String>stableOrder()
.add("x")
.add("y")
.addTransitive(innerA)
.addTransitive(innerB)
.addTransitive(innerC)
.add("z")
.build();
// Decomposing the nested set, should give us the correct set of transitive members.
ImmutableSet<Object> expected =
ImmutableSet.of(
(new NestedSetView<String>(innerA)).identifier(),
(new NestedSetView<String>(innerB)).identifier(),
(new NestedSetView<String>(innerC)).identifier());
ImmutableSet.Builder<Object> found = new ImmutableSet.Builder<Object>();
for (NestedSetView<String> transitive : (new NestedSetView<String>(outer)).transitives()) {
found.add(transitive.identifier());
}
assertThat(found.build()).isEqualTo(expected);
}
/** Naively traverse a view and collect all elements reachable. */
private static Set<String> contents(NestedSetView<String> view) {
ImmutableSet.Builder<String> builder = new ImmutableSet.Builder<String>();
builder.addAll(view.directs());
for (NestedSetView<String> transitive : view.transitives()) {
builder.addAll(contents(transitive));
}
return builder.build();
}
private static Set<Object> identifiers(Set<NestedSetView<String>> sets) {
ImmutableSet.Builder<Object> builder = new ImmutableSet.Builder<Object>();
for (NestedSetView<String> set : sets) {
builder.add(set.identifier());
}
return builder.build();
}
@Test
public void testContents() {
// Verify that the elements reachable from view are the correct ones, regardless if singletons
// are inlined or not. Also verify that sets with at least two elements are never inlined.
NestedSet<String> singleA = NestedSetBuilder.<String>stableOrder().add("a").build();
NestedSet<String> singleB = NestedSetBuilder.<String>stableOrder().add("b").build();
NestedSet<String> multi = NestedSetBuilder.<String>stableOrder().add("c1").add("c2").build();
NestedSet<String> outer =
NestedSetBuilder.<String>stableOrder()
.add("x")
.add("y")
.addTransitive(multi)
.addTransitive(singleA)
.addTransitive(singleB)
.add("z")
.build();
NestedSetView<String> view = new NestedSetView<String>(outer);
assertThat(contents(view)).containsExactly("a", "b", "c1", "c2", "x", "y", "z");
assertThat(identifiers(view.transitives()))
.contains((new NestedSetView<String>(multi)).identifier());
}
@Test
public void testSplitFails() {
NestedSet<String> a = NestedSetBuilder.<String>stableOrder().add("a").add("b").build();
NestedSetView<String> v = new NestedSetView<>(a);
MoreAsserts.assertThrows(
IllegalArgumentException.class, () -> v.splitIfExceedsMaximumSize(-100));
MoreAsserts.assertThrows(
IllegalArgumentException.class, () -> v.splitIfExceedsMaximumSize(1));
}
@Test
public void testSplitNoSplit() {
NestedSet<String> a = NestedSetBuilder.<String>stableOrder().add("a").add("b").build();
NestedSetView<String> v = new NestedSetView<>(a);
assertThat(v.splitIfExceedsMaximumSize(2)).isSameAs(v);
assertThat(v.splitIfExceedsMaximumSize(100)).isSameAs(v);
}
@Test
public void testSplit() {
NestedSet<String> a =
NestedSetBuilder.<String>stableOrder()
.addAll(Arrays.asList("a", "b", "c"))
.build();
NestedSetView<String> v = new NestedSetView<>(a);
NestedSetView<String> s = v.splitIfExceedsMaximumSize(2);
assertThat(s).isNotSameAs(v);
assertThat(collectCheckSize(s, 2)).containsExactly("a", "b", "c");
}
@Test
public void testRecursiveSplit() {
NestedSet<String> a =
NestedSetBuilder.<String>stableOrder()
.addAll(Arrays.asList("a", "b", "c", "d", "e"))
.build();
NestedSetView<String> v = new NestedSetView<>(a);
NestedSetView<String> s = v.splitIfExceedsMaximumSize(2);
assertThat(s).isNotSameAs(v);
assertThat(collectCheckSize(s, 2)).containsExactly("a", "b", "c", "d", "e");
}
private <T> List<T> collectCheckSize(NestedSetView<T> view, int maxSize) {
return collectCheckSize(new ArrayList<>(), view, maxSize);
}
private <T> List<T> collectCheckSize(List<T> result, NestedSetView<T> view, int maxSize) {
assertThat(view.directs().size()).isAtMost(maxSize);
assertThat(view.transitives().size()).isAtMost(maxSize);
for (NestedSetView<T> t : view.transitives()) {
collectCheckSize(result, t, maxSize);
}
result.addAll(view.directs());
return result;
}
}
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