io.trino.sql.tree.Extract Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of trino-parser Show documentation
There is a newer version: 465
/*
 * 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.sql.tree;

import com.google.common.collect.ImmutableList;
import com.google.errorprone.annotations.Immutable;

import java.util.List;
import java.util.Objects;

import static java.util.Objects.requireNonNull;

@Immutable
public class Extract
        extends Expression
{
    private final Expression expression;
    private final Field field;

    public enum Field
    {
        YEAR,
        QUARTER,
        MONTH,
        WEEK,
        DAY,
        DAY_OF_MONTH,
        DAY_OF_WEEK,
        DOW,
        DAY_OF_YEAR,
        DOY,
        YEAR_OF_WEEK,
        YOW,
        HOUR,
        MINUTE,
        SECOND,
        TIMEZONE_MINUTE,
        TIMEZONE_HOUR
    }

    public Extract(NodeLocation location, Expression expression, Field field)
    {
        super(location);
        requireNonNull(expression, "expression is null");
        requireNonNull(field, "field is null");

        this.expression = expression;
        this.field = field;
    }

    public Expression getExpression()
    {
        return expression;
    }

    public Field getField()
    {
        return field;
    }

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

    @Override
    public List getChildren()
    {
        return ImmutableList.of(expression);
    }

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

        Extract that = (Extract) o;
        return Objects.equals(expression, that.expression) &&
                (field == that.field);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(expression, field);
    }

    @Override
    public boolean shallowEquals(Node other)
    {
        if (!sameClass(this, other)) {
            return false;
        }

        Extract otherExtract = (Extract) other;
        return field.equals(otherExtract.field);
    }
}