commonMain.me.aartikov.replica.paged.PagedData.kt Maven / Gradle / Ivy

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package me.aartikov.replica.paged

data class PagedData>(
    val pages: List,
    val items: List
) {
    constructor(
        pages: List
,
        idExtractor: ((I) -> Any)? = null
    ) : this(pages, getItems(pages, idExtractor))

    val hasNextPage get() = pages.lastOrNull()?.hasNextPage ?: false

    val hasPreviousPage get() = pages.firstOrNull()?.hasPreviousPage ?: false
}

private fun > getItems(pages: List, idExtractor: ((I) -> Any)? = null): List {
    val items = pages.asSequence().flatMap { it.items }
    return if (idExtractor == null) {
        items.toList()
    } else {
        items.distinctBy { idExtractor(it) }.toList()
    }
}