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/*
 * 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 io.prestosql.sql.tree;

import com.google.common.collect.ImmutableList;

import java.util.List;
import java.util.Objects;
import java.util.Optional;

import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;

public class GroupBy
        extends Node
{
    private final boolean isDistinct;
    private final List groupingElements;

    public GroupBy(boolean isDistinct, List groupingElements)
    {
        this(Optional.empty(), isDistinct, groupingElements);
    }

    public GroupBy(NodeLocation location, boolean isDistinct, List groupingElements)
    {
        this(Optional.of(location), isDistinct, groupingElements);
    }

    private GroupBy(Optional location, boolean isDistinct, List groupingElements)
    {
        super(location);
        this.isDistinct = isDistinct;
        this.groupingElements = ImmutableList.copyOf(requireNonNull(groupingElements));
    }

    public boolean isDistinct()
    {
        return isDistinct;
    }

    public List getGroupingElements()
    {
        return groupingElements;
    }

    @Override
    protected  R accept(AstVisitor visitor, C context)
    {
        return visitor.visitGroupBy(this, context);
    }

    @Override
    public List getChildren()
    {
        return groupingElements;
    }

    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        GroupBy groupBy = (GroupBy) o;
        return isDistinct == groupBy.isDistinct &&
                Objects.equals(groupingElements, groupBy.groupingElements);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(isDistinct, groupingElements);
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("isDistinct", isDistinct)
                .add("groupingElements", groupingElements)
                .toString();
    }
}