commonMain.com.kizitonwose.calendar.data.DataStore.kt Maven / Gradle / Ivy

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A highly customizable calendar library for Compose Multiplatform, backed by LazyRow/LazyColumn.

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package com.kizitonwose.calendar.data

/**
 * Basically [MutableMap.getOrPut] but allows us read the map
 * in multiple places without calling `getOrPut` everywhere.
 */
internal class DataStore(
    private val store: MutableMap = HashMap(),
    private val create: (offset: Int) -> V,
) : MutableMap by store {
    override fun get(key: Int): V {
        val value = store[key]
        return if (value == null) {
            val data = create(key)
            put(key, data)
            data
        } else {
            value
        }
    }
}