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Trino - Delta Lake connector

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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.trino.plugin.deltalake.expression;

import java.util.Objects;

import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;

public class Identifier
        extends SparkExpression
{
    private final String value;

    public Identifier(String value)
    {
        checkArgument(!value.isEmpty(), "value is empty");
        this.value = value;
    }

    public String getValue()
    {
        return value;
    }

    @Override
    public  R accept(SparkExpressionTreeVisitor visitor, C context)
    {
        return visitor.visitIdentifier(this, context);
    }

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

        Identifier that = (Identifier) o;
        return Objects.equals(value, that.value);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(value);
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .addValue(value)
                .toString();
    }
}