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/*
 * Copyright 2018-2020 the original author or authors.
 *
 * 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 dev.miku.r2dbc.mysql.codec.lob;

import dev.miku.r2dbc.mysql.collation.CharCollation;
import dev.miku.r2dbc.mysql.ServerVersion;
import io.netty.buffer.ByteBuf;
import io.r2dbc.spi.Clob;

import java.util.List;

/**
 * An implementation of {@link Clob} for multi-{@link ByteBuf}s.
 */
final class MultiClob extends MultiLob implements Clob {

    private final int collationId;

    private final ServerVersion version;

    MultiClob(List buffers, int collationId, ServerVersion version) {
        super(buffers);

        this.collationId = collationId;
        this.version = version;
    }

    @Override
    protected CharSequence convert(ByteBuf buf) {
        if (!buf.isReadable()) {
            return "";
        }

        return buf.readCharSequence(buf.readableBytes(), CharCollation.fromId(collationId, version).getCharset());
    }
}