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/*
 * 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.base;

import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtCompatible;
import java.io.Serializable;
import javax.annotation.Nullable;

/**
 *  Equivalence applied on functional result.
 *
 *  @author Bob Lee
 *  @since 10.0
 *
 * @deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
 */
@Beta
@GwtCompatible
@Deprecated(since = "2022-12-01")
final class FunctionalEquivalence extends Equivalence implements Serializable {

    private static final long serialVersionUID = 0;

    private final Function function;

    private final Equivalence resultEquivalence;

    FunctionalEquivalence(Function function, Equivalence resultEquivalence) {
        this.function = checkNotNull(function);
        this.resultEquivalence = checkNotNull(resultEquivalence);
    }

    @Override
    protected boolean doEquivalent(F a, F b) {
        return resultEquivalence.equivalent(function.apply(a), function.apply(b));
    }

    @Override
    protected int doHash(F a) {
        return resultEquivalence.hash(function.apply(a));
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof FunctionalEquivalence) {
            FunctionalEquivalence that = (FunctionalEquivalence) obj;
            return function.equals(that.function) && resultEquivalence.equals(that.resultEquivalence);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(function, resultEquivalence);
    }

    @Override
    public String toString() {
        return resultEquivalence + ".onResultOf(" + function + ")";
    }
}