/*
 * Copyright (C) 2018-2020. Huawei Technologies Co., Ltd. All rights reserved.
 * 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.prestosql.plugin.hive.coercions;

import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import io.prestosql.spi.block.Block;
import io.prestosql.spi.block.BlockBuilder;
import io.prestosql.spi.type.VarcharType;

public class VarcharToVarcharCoercer
        extends TypeCoercer<VarcharType, VarcharType>
{
    public VarcharToVarcharCoercer(VarcharType fromType, VarcharType toType)
    {
        super(fromType, toType);
    }

    @Override
    protected void applyCoercedValue(BlockBuilder blockBuilder, Block block, int position)
    {
        Slice from = fromType.getSlice(block, position);
        int length = Math.min(from.length(), toType.getLength().orElse(VarcharType.UNBOUNDED_LENGTH));
        Slice copy = Slices.copyOf(from, 0, length);
        toType.writeSlice(blockBuilder, copy);
    }
}
