com.github.richardballard.arbeeutils.change.ChangedValue Maven / Gradle / Ivy

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A collection of utilities that I find useful across various projects

There is a newer version: 2.0

/*
 * (C) Copyright 2016 Richard Ballard.
 *
 * 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.github.richardballard.arbeeutils.change;

import net.jcip.annotations.Immutable;
import org.jetbrains.annotations.NotNull;

import java.util.Optional;

@Immutable
public class ChangedValue {
    @NotNull
    private final Optional previousValue;

    @NotNull
    private final Optional newValue;

    public ChangedValue(@NotNull final Optional previousValue,
                        @NotNull final Optional newValue) {
        assert previousValue != null;
        assert newValue != null;

        this.previousValue = previousValue;
        this.newValue = newValue;
    }

    @NotNull
    public Optional getPreviousValue() {
        return previousValue;
    }

    @NotNull
    public Optional getNewValue() {
        return newValue;
    }


    @Override
    public boolean equals(final Object o) {
        if(this == o) {
            return true;
        }
        if(o == null || getClass() != o.getClass()) {
            return false;
        }

        final ChangedValue that = (ChangedValue) o;

        if(!previousValue.equals(that.previousValue)) {
            return false;
        }
        return newValue.equals(that.newValue);

    }

    @Override
    public int hashCode() {
        int result = previousValue.hashCode();
        result = 31 * result + newValue.hashCode();
        return result;
    }

    @Override
    public String toString() {
        return "ChangedValue{" +
               "previousValue=" + previousValue +
               ", newValue=" + newValue +
               '}';
    }
}