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// Copyright 2014 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 com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import java.util.List;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Memory-optimized NestedSet implementation for NestedSets without transitive dependencies that
* allows us to share an ImmutableList.
*/
abstract class ImmutableListDirectsNestedSet<E> extends NestedSet<E> {
@SuppressWarnings("rawtypes")
private static final NestedSet[] EMPTY = new NestedSet[0];
private final ImmutableList<E> directDeps;
public ImmutableListDirectsNestedSet(ImmutableList<E> directDeps) {
this.directDeps = directDeps;
}
@Override
public abstract Order getOrder();
@Override
Object[] directMembers() {
return directDeps.toArray();
}
@SuppressWarnings({"cast", "unchecked"})
@Override
NestedSet<? extends E>[] transitiveSets() {
return (NestedSet<? extends E>[]) EMPTY;
}
@Override
public boolean isEmpty() {
return directDeps.isEmpty();
}
/**
* Currently all the Order implementations return the direct elements in the same order if they do
* not have transitive elements. So we skip calling order.getExpander().
*/
@SuppressWarnings("unchecked")
@Override
public List<E> toList() {
return directDeps;
}
@SuppressWarnings("unchecked")
@Override
public Set<E> toSet() {
return ImmutableSet.copyOf(directDeps);
}
@Override
public boolean shallowEquals(@Nullable NestedSet<? extends E> other) {
if (this == other) {
return true;
}
if (other == null) {
return false;
}
return getOrder().equals(other.getOrder())
&& other instanceof ImmutableListDirectsNestedSet
&& directDeps.equals(((ImmutableListDirectsNestedSet<? extends E>) other).directDeps);
}
@Override
public int shallowHashCode() {
return directDeps.hashCode();
}
}
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