io.questdb.griffin.engine.functions.str.ToCharBinFunctionFactory Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of questdb Show documentation
QuestDB is high performance SQL time series database
There is a newer version: 8.2.1
/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  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.questdb.griffin.engine.functions.str;

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.engine.functions.StrFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.BinarySequence;
import io.questdb.std.Chars;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;
import io.questdb.std.str.StringSink;
import org.jetbrains.annotations.Nullable;

public class ToCharBinFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "to_char(U)";
    }

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

    private static class ToCharBinFunc extends StrFunction implements UnaryFunction {
        private final Function arg;
        private final StringSink sinkA = new StringSink();
        private final StringSink sinkB = new StringSink();

        public ToCharBinFunc(Function arg) {
            this.arg = arg;
        }

        @Override
        public Function getArg() {
            return arg;
        }

        @Override
        public String getName() {
            return "to_char";
        }

        @Override
        public CharSequence getStrA(Record rec) {
            return toSink(rec, sinkA);
        }

        @Override
        public CharSequence getStrB(Record rec) {
            return toSink(rec, sinkB);
        }

        @Override
        public int getStrLen(Record rec) {
            BinarySequence sequence = arg.getBin(rec);
            if (sequence == null) {
                return -1;
            }

            int len = (int) sequence.length();
            // number of lines
            int incompleteLine = len % 16;
            int count = len / 16 * 57;
            if (incompleteLine > 0) {
                count += incompleteLine * 2 + incompleteLine + 8;
            } else {
                count--; // subtract extra line end we took into account
            }
            return count;
        }

        @Override
        public boolean isThreadSafe() {
            return false;
        }

        @Nullable
        private CharSequence toSink(Record rec, StringSink sink) {
            final BinarySequence sequence = arg.getBin(rec);
            if (sequence == null) {
                return null;
            }
            sink.clear();
            Chars.toSink(sequence, sink);
            return sink;
        }
    }
}