/*
 * Copyright (c) 2010-2015 Evolveum
 *
 * 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.evolveum.midpoint.prism.query;

import com.evolveum.midpoint.prism.path.ItemPath;

import java.io.Serializable;

/**
 * @author mederly
 */
public class ObjectOrdering implements Serializable {

    final private ItemPath orderBy;
    final private OrderDirection direction;

    ObjectOrdering(ItemPath orderBy, OrderDirection direction) {
        if (ItemPath.isNullOrEmpty(orderBy)) {
            throw new IllegalArgumentException("Null or empty ordering path is not supported.");
        }
        this.orderBy = orderBy;
        this.direction = direction;
    }

    public static ObjectOrdering createOrdering(ItemPath orderBy, OrderDirection direction) {
        return new ObjectOrdering(orderBy, direction);
    }

    public ItemPath getOrderBy() {
        return orderBy;
    }

    public OrderDirection getDirection() {
        return direction;
    }

    @Override
    public String toString() {
        return orderBy.toString() + " " + direction;
    }

	@Override
	public boolean equals(Object o) {
		return equals(o, true);
	}

	public boolean equals(Object o, boolean exact) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		ObjectOrdering that = (ObjectOrdering) o;

		if (orderBy != null ? !orderBy.equals(that.orderBy, exact) : that.orderBy != null)
			return false;
		return direction == that.direction;

	}

	@Override
	public int hashCode() {
		int result = 1;
		result = 31 * result + (direction != null ? direction.hashCode() : 0);
		return result;
	}
}