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QuestDB is high performance SQL time series database

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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 *  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
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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.math;

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.DoubleFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.griffin.engine.functions.constants.DoubleConstant;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

public class DegreesDoubleFunctionFactory implements FunctionFactory {

    public static final String SYMBOL = "degrees";

    @Override
    public String getSignature() {
        return SYMBOL + "(D)";
    }

    @Override
    public Function newInstance(
            int position, ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        Function angleRad = args.getQuick(0);
        if (angleRad.isConstant()) {
            return new DoubleConstant(Math.toDegrees(angleRad.getDouble(null)));
        }
        return new FromRadians(args.getQuick(0));
    }

    private static class FromRadians extends DoubleFunction implements UnaryFunction {
        final Function function;

        public FromRadians(Function function) {
            this.function = function;
        }

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

        @Override
        public double getDouble(Record rec) {
            return Math.toDegrees(function.getDouble(rec));
        }

        @Override
        public String getName() {
            return SYMBOL;
        }
    }
}