com.google.common.collect.LexicographicalOrdering 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) 2007 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 com.google.common.annotations.GwtCompatible;
import java.io.Serializable;
import java.util.Comparator;
import java.util.Iterator;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/** An ordering which sorts iterables by comparing corresponding elements pairwise. */
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
final class LexicographicalOrdering extends Ordering>
implements Serializable {
final Comparator elementOrder;
LexicographicalOrdering(Comparator elementOrder) {
this.elementOrder = elementOrder;
}
@Override
public int compare(Iterable leftIterable, Iterable rightIterable) {
Iterator left = leftIterable.iterator();
Iterator right = rightIterable.iterator();
while (left.hasNext()) {
if (!right.hasNext()) {
return LEFT_IS_GREATER; // because it's longer
}
int result = elementOrder.compare(left.next(), right.next());
if (result != 0) {
return result;
}
}
if (right.hasNext()) {
return RIGHT_IS_GREATER; // because it's longer
}
return 0;
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object == this) {
return true;
}
if (object instanceof LexicographicalOrdering) {
LexicographicalOrdering that = (LexicographicalOrdering) object;
return this.elementOrder.equals(that.elementOrder);
}
return false;
}
@Override
public int hashCode() {
return elementOrder.hashCode() ^ 2075626741; // meaningless
}
@Override
public String toString() {
return elementOrder + ".lexicographical()";
}
private static final long serialVersionUID = 0;
}