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/*
* 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 shaded.shaded.com.google.common.collect;
import static shaded.shaded.com.google.common.base.Preconditions.checkNotNull;
import shaded.shaded.com.google.common.annotations.GwtCompatible;
import shaded.shaded.com.google.common.base.Function;
import shaded.shaded.com.google.common.base.Objects;
import java.io.Serializable;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* An ordering that orders elements by applying an order to the result of a function on those
* elements.
*/
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
final class ByFunctionOrdering
extends Ordering implements Serializable {
final Function function;
final Ordering ordering;
ByFunctionOrdering(Function function, Ordering ordering) {
this.function = checkNotNull(function);
this.ordering = checkNotNull(ordering);
}
@Override
public int compare(@ParametricNullness F left, @ParametricNullness F right) {
return ordering.compare(function.apply(left), function.apply(right));
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object == this) {
return true;
}
if (object instanceof ByFunctionOrdering) {
ByFunctionOrdering that = (ByFunctionOrdering) object;
return this.function.equals(that.function) && this.ordering.equals(that.ordering);
}
return false;
}
@Override
public int hashCode() {
return Objects.hashCode(function, ordering);
}
@Override
public String toString() {
return ordering + ".onResultOf(" + function + ")";
}
private static final long serialVersionUID = 0;
}