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/**
 * Copyright 2015 Groupon.com
 *
 * 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 models.internal;

import com.google.common.base.Optional;

/**
 * Internal model interface for a quantity.
 *
 * @author Ville Koskela (vkoskela at groupon dot com)
 */
public interface Quantity {

    /**
     * The value of the Quantity.
     *
     * @return The value.
     */
    double getValue();

    /**
     * The optional unit of the value in the Quantity.
     *
     * @return The optional unit.
     */
    Optional getUnit();
}