/*
 * 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 com.facebook.presto.common.type;

import com.facebook.presto.common.block.Block;
import com.facebook.presto.common.block.BlockBuilder;
import com.facebook.presto.common.function.SqlFunctionProperties;
import com.fasterxml.jackson.annotation.JsonCreator;
import io.airlift.slice.Slice;

import java.util.List;

import static java.util.Collections.singletonList;

public abstract class StatisticalDigestType
        extends AbstractVariableWidthType
{
    private final Type type;

    @JsonCreator
    public StatisticalDigestType(String name, Type type)
    {
        super(new TypeSignature(name, TypeSignatureParameter.of(type.getTypeSignature())), Slice.class);
        this.type = type;
    }

    @Override
    public void appendTo(Block block, int position, BlockBuilder blockBuilder)
    {
        if (block.isNull(position)) {
            blockBuilder.appendNull();
        }
        else {
            block.writeBytesTo(position, 0, block.getSliceLength(position), blockBuilder);
            blockBuilder.closeEntry();
        }
    }

    @Override
    public Slice getSlice(Block block, int position)
    {
        return block.getSlice(position, 0, block.getSliceLength(position));
    }

    @Override
    public void writeSlice(BlockBuilder blockBuilder, Slice value)
    {
        writeSlice(blockBuilder, value, 0, value.length());
    }

    @Override
    public void writeSlice(BlockBuilder blockBuilder, Slice value, int offset, int length)
    {
        blockBuilder.writeBytes(value, offset, length).closeEntry();
    }

    @Override
    public Object getObjectValue(SqlFunctionProperties properties, Block block, int position)
    {
        if (block.isNull(position)) {
            return null;
        }

        return new SqlVarbinary(block.getSlice(position, 0, block.getSliceLength(position)).getBytes());
    }

    @Override
    public List<Type> getTypeParameters()
    {
        return singletonList(type);
    }
}
