/**
 * Copyright 2012-2015 Niall Gallagher
 *
 * 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.googlecode.cqengine.index.support;

import java.util.Objects;

/**
 * Encapsulates a key-value pair.
 *
 * @author niall.gallagher
 */
public class KeyValueMaterialized<A, O> implements KeyValue<A, O> {

    final A key;
    final O value;

    public KeyValueMaterialized(A key, O value) {
        this.key = key;
        this.value = value;
    }

    @Override
    public A getKey() {
        return key;
    }

    @Override
    public O getValue() {
        return value;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        KeyValueMaterialized<?, ?> that = (KeyValueMaterialized<?, ?>) o;
        return key.equals(that.key) &&
                value.equals(that.value);
    }

    @Override
    public int hashCode() {
        return Objects.hash(key, value);
    }

    @Override
    public String toString() {
        return key + "=" + value;
    }
}
