com.google.common.collect.ExplicitOrdering 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.List;
import javax.annotation.CheckForNull;
/** An ordering that compares objects according to a given order. */
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
final class ExplicitOrdering extends Ordering implements Serializable {
final ImmutableMap rankMap;
ExplicitOrdering(List valuesInOrder) {
this(Maps.indexMap(valuesInOrder));
}
ExplicitOrdering(ImmutableMap rankMap) {
this.rankMap = rankMap;
}
@Override
public int compare(T left, T right) {
return rank(left) - rank(right); // safe because both are nonnegative
}
private int rank(T value) {
Integer rank = rankMap.get(value);
if (rank == null) {
throw new IncomparableValueException(value);
}
return rank;
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object instanceof ExplicitOrdering) {
ExplicitOrdering that = (ExplicitOrdering) object;
return this.rankMap.equals(that.rankMap);
}
return false;
}
@Override
public int hashCode() {
return rankMap.hashCode();
}
@Override
public String toString() {
return "Ordering.explicit(" + rankMap.keySet() + ")";
}
private static final long serialVersionUID = 0;
}