commonMain.jetbrains.datalore.plot.base.ScaleMapper.kt Maven / Gradle / Ivy

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/*
 * Copyright (c) 2022. JetBrains s.r.o.
 * Use of this source code is governed by the MIT license that can be found in the LICENSE file.
 */

package jetbrains.datalore.plot.base

// :(( Implementing function interface is prohibited in JavaScript
// We can't implement ScaleMapper (in GuideMapper(s)) this way.
// :

//typealias ScaleMapper = (Double?) -> TargetT?

interface ScaleMapper {
    operator fun invoke(v: Double?): TargetT?

    companion object {
        fun  wrap(f: (Double?) -> T): ScaleMapper {
            return object : ScaleMapper {
                override fun invoke(v: Double?): T? {
                    return f(v)
                }
            }
        }

        fun  wrap(f: (Double?) -> T?, defaultValue: T): ScaleMapper {
            return object : ScaleMapper {
                override fun invoke(v: Double?): T? {
                    return f(v) ?: defaultValue
                }
            }
        }

        fun  wrap(f: ScaleMapper, defaultValue: T): ScaleMapper {
            return object : ScaleMapper {
                override fun invoke(v: Double?): T? {
                    return f(v) ?: defaultValue
                }
            }
        }
    }
}