/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.analyze.relations;

import io.crate.analyze.OrderBy;
import io.crate.sql.tree.QualifiedName;

import javax.annotation.Nonnull;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

public class RemainingOrderBy {

    private final Set<QualifiedName> relations = new HashSet<>();
    private OrderBy orderBy;

    void addRelation(@Nonnull QualifiedName relation) {
        relations.add(relation);
    }

    void addOrderBy(@Nonnull OrderBy orderBy) {
        this.orderBy = orderBy.merge(this.orderBy);
    }

    /**
     * Validate against the {@link #relations} argument if this remaining OrderBy can be applied
     * by checking if all relations of this remaining OrderBy are contained in the {@link #relations}
     */
    public boolean validForRelations(@Nonnull Collection<QualifiedName> relations) {
        return relations.containsAll(this.relations);
    }

    public Set<QualifiedName> relations() {
        return relations;
    }

    public OrderBy orderBy() {
        return orderBy;
    }

    @Override
    public String toString() {
        return "RemainingOrderBy{" + orderBy + '}';
    }
}