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QuestDB is high performance SQL time series database

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 *  Copyright (c) 2014-2019 Appsicle
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 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.cast;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.SqlUtil;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;
import io.questdb.std.str.Utf8Sequence;
import io.questdb.std.str.Utf8StringSink;

public class CastLong256ToVarcharFunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "cast(Hø)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        return new Func(args.get(0));
    }

    public static class Func extends AbstractCastToVarcharFunction {
        private final Utf8StringSink sinkA = new Utf8StringSink();
        private final Utf8StringSink sinkB = new Utf8StringSink();

        public Func(Function arg) {
            super(arg);
        }

        @Override
        public Utf8Sequence getVarcharA(Record rec) {
            sinkA.clear();
            return SqlUtil.implicitCastLong256AsStr(arg.getLong256A(rec), sinkA) ? sinkA : null;
        }

        @Override
        public Utf8Sequence getVarcharB(Record rec) {
            sinkB.clear();
            return SqlUtil.implicitCastLong256AsStr(arg.getLong256A(rec), sinkB) ? sinkB : null;
        }
    }
}