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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.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import javax.annotation.Nullable;
/**
* An empty nested set.
*/
final class EmptyNestedSet<E> extends NestedSet<E> {
private static final NestedSet[] EMPTY_NESTED_SET = new NestedSet[0];
private static final Object[] EMPTY_ELEMENTS = new Object[0];
private final Order order;
EmptyNestedSet(Order type) {
this.order = type;
}
@Override
public Iterator<E> iterator() {
return ImmutableList.<E>of().iterator();
}
@Override
Object[] directMembers() {
return EMPTY_ELEMENTS;
}
@Override
NestedSet[] transitiveSets() {
return EMPTY_NESTED_SET;
}
@Override
public boolean isEmpty() {
return true;
}
@Override
public List<E> toList() {
return ImmutableList.of();
}
@Override
public Set<E> toSet() {
return ImmutableSet.of();
}
@Override
public String toString() {
return "{}";
}
@Override
public Order getOrder() {
return order;
}
@Override
public boolean shallowEquals(@Nullable NestedSet<? extends E> other) {
return other != null && getOrder() == other.getOrder() && other.isEmpty();
}
@Override
public int shallowHashCode() {
return Objects.hashCode(getOrder());
}
}
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