/*
 * 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.facebook.presto.sql.planner.assertions;

import com.facebook.presto.spi.relation.VariableReferenceExpression;
import com.facebook.presto.sql.planner.plan.JoinNode;

import java.util.Optional;

import static com.facebook.presto.common.type.BigintType.BIGINT;
import static java.util.Objects.requireNonNull;

class EquiJoinClauseProvider
        implements ExpectedValueProvider<JoinNode.EquiJoinClause>
{
    private final SymbolAlias left;
    private final SymbolAlias right;

    EquiJoinClauseProvider(SymbolAlias left, SymbolAlias right)
    {
        this.left = requireNonNull(left, "left is null");
        this.right = requireNonNull(right, "right is null");
    }

    public JoinNode.EquiJoinClause getExpectedValue(SymbolAliases aliases)
    {
        return new JoinNode.EquiJoinClause(
                new VariableReferenceExpression(Optional.empty(), left.toSymbol(aliases).getName(), BIGINT),
                new VariableReferenceExpression(Optional.empty(), right.toSymbol(aliases).getName(), BIGINT));
    }

    @Override
    public String toString()
    {
        return left + " = " + right;
    }
}
