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// Copyright 2014 Google Inc. 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;
/**
* Type of a nested set (defines order).
*/
public enum Order {
STABLE_ORDER(new CompileOrderExpander<>(), new StableOrderNestedSetFactory()),
COMPILE_ORDER(new CompileOrderExpander<>(), new CompileOrderNestedSetFactory()),
LINK_ORDER(new LinkOrderExpander<>(), new LinkOrderNestedSetFactory()),
NAIVE_LINK_ORDER(new NaiveLinkOrderExpander<>(), new NaiveLinkOrderNestedSetFactory());
private final NestedSetExpander<?> expander;
final NestedSetFactory factory;
private final NestedSet<?> emptySet;
private Order(NestedSetExpander<?> expander, NestedSetFactory factory) {
this.expander = expander;
this.factory = factory;
this.emptySet = new EmptyNestedSet<Object>(this);
}
/**
* Returns an empty set of the given ordering.
*/
@SuppressWarnings("unchecked") // Nested sets are immutable, so a downcast is fine.
<E> NestedSet<E> emptySet() {
return (NestedSet<E>) emptySet;
}
/**
* Returns an empty set of the given ordering.
*/
@SuppressWarnings("unchecked") // Nested set expanders contain no data themselves.
<E> NestedSetExpander<E> expander() {
return (NestedSetExpander<E>) expander;
}
}
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