/*
 * Licensed to Crate.io 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.function.Consumer;
import java.util.function.Function;

public class NotNullColumnConstraint<T> extends ColumnConstraint<T> {

    private static final String NAME = "NOT NULL";

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

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

    @Override
    public String toString() {
        return NAME;
    }

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

    @Override
    public <U> ColumnConstraint<U> map(Function<? super T, ? extends U> mapper) {
        return new NotNullColumnConstraint<>();
    }

    @Override
    public void visit(Consumer<? super T> consumer) {
    }
}
