com.google.common.collect.SortedIterables Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright (C) 2011 The Guava Authors
*
* 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.common.collect;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import java.util.Comparator;
import java.util.SortedSet;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Utilities for dealing with sorted collections of all types.
*
* @author Louis Wasserman
*/
@GwtCompatible
@ElementTypesAreNonnullByDefault
final class SortedIterables {
private SortedIterables() {}
/**
* Returns {@code true} if {@code elements} is a sorted collection using an ordering equivalent to
* {@code comparator}.
*/
public static boolean hasSameComparator(Comparator comparator, Iterable elements) {
checkNotNull(comparator);
checkNotNull(elements);
Comparator comparator2;
if (elements instanceof SortedSet) {
comparator2 = comparator((SortedSet) elements);
} else if (elements instanceof SortedIterable) {
comparator2 = ((SortedIterable) elements).comparator();
} else {
return false;
}
return comparator.equals(comparator2);
}
@SuppressWarnings("unchecked")
// if sortedSet.comparator() is null, the set must be naturally ordered
public static Comparator comparator(
SortedSet sortedSet) {
Comparator result = sortedSet.comparator();
if (result == null) {
result = (Comparator) Ordering.natural();
}
return result;
}
}