/*
 * Licensed to CRATE Technology GmbH ("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.sql.tree;

import java.util.Optional;

public class KillStatement extends Statement {

    private final Optional<Expression> jobId;


    public KillStatement() {
        this.jobId = Optional.empty();
    }

    public KillStatement(Expression jobId) {
        this.jobId = Optional.of(jobId);
    }

    public Optional<Expression> jobId() {
        return jobId;
    }

    @Override
    public int hashCode() {
        return jobId.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null || getClass() != obj.getClass()) return false;

        KillStatement that = (KillStatement) obj;

        return jobId.equals(that.jobId);
    }

    @Override
    public String toString() {
        return jobId.isPresent() ? "KILL '" + jobId.get() + "'" : "KILL ALL";
    }

    @Override
    public <R, C> R accept(AstVisitor<R, C> visitor, C context) {
        return visitor.visitKillStatement(this, context);
    }
}