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Comment group and associate functions

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Andrew 2024-06-07 00:25:58 +09:30
parent f40a0a8a48
commit 4f61f89eb7
1 changed files with 36 additions and 13 deletions
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49
libsession/src/main/java/org/session/libsession/utilities/Util.kt
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@ -22,6 +22,7 @@ import java.util.concurrent.CountDownLatch
import java.util.concurrent.ExecutorService
import java.util.concurrent.ThreadPoolExecutor
import java.util.concurrent.TimeUnit
import kotlin.collections.LinkedHashMap
import kotlin.math.min
object Util {
@ -369,23 +370,45 @@ object Util {
fun <T, R> T.runIf(condition: Boolean, block: T.() -> R): R where T: R = if (condition) block() else this
/**
* Returns a [Map] containing the elements from the given array indexed by the key
* returned from [keySelector] function applied to each element.
*
* If any two elements would have the same key returned by [keySelector] the last one gets added to the map.
*
* If any element is null or the key is null, it will not be added to the [Map].
*
* @see associateBy
*/
fun <T, K: Any> Iterable<T>.associateByNotNull(
keySelector: (T) -> K?
) = associateByNotNull(keySelector) { it }
fun <T, K: Any, V: Any> Iterable<T>.associateByNotNull(
keySelector: (T) -> K?,
valueTransform: (T) -> V?,
): Map<K, V> = buildMap {
for (item in this@associateByNotNull) {
val key = keySelector(item) ?: continue
val value = valueTransform(item) ?: continue
this[key] = value
}
/**
* Returns a [Map] containing the values provided by [valueTransform] and indexed by [keySelector]
* functions applied to elements of the given collection.
*
* If any two elements would have the same key returned by [keySelector] the last one gets added to
* the map.
*
* If any element produces a null key or value it will not be added to the [Map].
*
* @see associateBy
*/
fun <E, K: Any, V: Any> Iterable<E>.associateByNotNull(
keySelector: (E) -> K?,
valueTransform: (E) -> V?,
): Map<K, V> = mutableMapOf<K, V>().also {
for(e in this) { it[keySelector(e) ?: continue] = valueTransform(e) ?: continue }
}
inline fun <T, K> Iterable<T>.groupByNotNull(keySelector: (T) -> K?): Map<K, List<T>> {
val map = mutableMapOf<K, MutableList<T>>()
forEach { e -> keySelector(e)?.let { k -> map.getOrPut(k) { mutableListOf() }.add(e) } }
return map
/**
* Groups elements of the original collection by the key returned by the given [keySelector] function
* applied to each element and returns a map where each group key is associated with a list of
* corresponding elements, omitting elements with a null key.
*
* @see groupBy
*/
inline fun <E, K> Iterable<E>.groupByNotNull(keySelector: (E) -> K?): Map<K, List<E>> = LinkedHashMap<K, MutableList<E>>().also {
forEach { e -> keySelector(e)?.let { k -> it.getOrPut(k) { mutableListOf() } += e } }
}