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• NullsFirstOrdering.java

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org.glassfish.jersey.internal.guava.NullsFirstOrdering Maven / Gradle / Ivy

/*
 * 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 org.glassfish.jersey.internal.guava;

import java.io.Serializable;

/**
 * An ordering that treats {@code null} as less than all other values.
 */
final class NullsFirstOrdering extends Ordering implements Serializable {
    private static final long serialVersionUID = 0;
    private final Ordering ordering;

    NullsFirstOrdering(Ordering ordering) {
        this.ordering = ordering;
    }

    @Override
    public int compare(T left, T right) {
        if (left == right) {
            return 0;
        }
        if (left == null) {
            return RIGHT_IS_GREATER;
        }
        if (right == null) {
            return LEFT_IS_GREATER;
        }
        return ordering.compare(left, right);
    }

    @Override
    public  Ordering reverse() {
        // ordering.reverse() might be optimized, so let it do its thing
        return ordering.reverse().nullsLast();
    }

    @SuppressWarnings("unchecked") // still need the right way to explain this
    @Override
    public  Ordering nullsFirst() {
        return (Ordering) this;
    }

    @Override
    public  Ordering nullsLast() {
        return ordering.nullsLast();
    }

    @Override
    public boolean equals(Object object) {
        if (object == this) {
            return true;
        }
        if (object instanceof NullsFirstOrdering) {
            NullsFirstOrdering that = (NullsFirstOrdering) object;
            return this.ordering.equals(that.ordering);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return ordering.hashCode() ^ 957692532; // meaningless
    }

    @Override
    public String toString() {
        return ordering + ".nullsFirst()";
    }
}