/*
* 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 com.google.common.base.Preconditions;

import java.util.Optional;

public class AllColumns extends SelectItem {

    private final Optional<QualifiedName> prefix;

    public AllColumns() {
        prefix = Optional.empty();
    }

    public AllColumns(QualifiedName prefix) {
        Preconditions.checkNotNull(prefix, "prefix is null");
        this.prefix = Optional.of(prefix);
    }

    public Optional<QualifiedName> getPrefix() {
        return prefix;
    }

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

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

        AllColumns that = (AllColumns) o;

        if (prefix != null ? !prefix.equals(that.prefix) : that.prefix != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        return prefix != null ? prefix.hashCode() : 0;
    }

    @Override
    public String toString() {
        if (prefix.isPresent()) {
            return prefix.get() + ".*";
        }

        return "*";
    }
}