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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;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import java.util.HashMap;
/**
* Type of a nested set (defines order). For explanation what these ordering mean,
* see CompileOrderExpander, LinkOrderExpander, NaiveLinkOrderExpander.
*/
public enum Order {
STABLE_ORDER("stable", new CompileOrderExpander<>(), new StableOrderNestedSetFactory()),
COMPILE_ORDER("compile", new CompileOrderExpander<>(), new CompileOrderNestedSetFactory()),
LINK_ORDER("link", new LinkOrderExpander<>(), new LinkOrderNestedSetFactory()),
NAIVE_LINK_ORDER("naive_link", new NaiveLinkOrderExpander<>(),
new NaiveLinkOrderNestedSetFactory());
private static final ImmutableMap<String, Order> VALUES;
private final String name;
private final NestedSetExpander<?> expander;
final NestedSetFactory factory;
private final NestedSet<?> emptySet;
private Order(String name, NestedSetExpander<?> expander, NestedSetFactory factory) {
this.name = name;
this.expander = expander;
this.factory = factory;
this.emptySet = new EmptyNestedSet<>(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;
}
public String getName() {
return name;
}
/**
* Parses the given string as a set order
*
* @param name Unique name of the order
* @return Order The appropriate order instance
* @throws IllegalArgumentException If the name is not valid
*/
public static Order parse(String name) {
if (!VALUES.containsKey(name)) {
throw new IllegalArgumentException("Invalid order: " + name);
}
return VALUES.get(name);
}
/**
* Indexes all possible values by name and stores the results in a {@code ImmutableMap}
*/
static {
Order[] tmpValues = Order.values();
HashMap<String, Order> entries = Maps.newHashMapWithExpectedSize(tmpValues.length);
for (Order current : tmpValues) {
entries.put(current.getName(), current);
}
VALUES = ImmutableMap.copyOf(entries);
}
}
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