com.itangcent.common.utils.CollectionKit.kt Maven / Gradle / Ivy

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package com.itangcent.common.utils

import java.util.*

/**
 * Accumulates value starting with the first element and applying [operation] from left to right to current accumulator value and each element.
 */
inline fun  Iterable.reduceSafely(operation: (acc: S, T) -> S): S? {
    val iterator = this.iterator()
    if (!iterator.hasNext()) return null
    var accumulator: S = iterator.next()
    while (iterator.hasNext()) {
        accumulator = operation(accumulator, iterator.next())
    }
    return accumulator
}

fun Array<*>?.notNullOrEmpty(): Boolean {
    return !this.isNullOrEmpty()
}

fun Collection<*>?.notNullOrEmpty(): Boolean {
    return !this.isNullOrEmpty()
}

fun  List.asArrayList(): ArrayList {
    if (this is ArrayList) {
        return this
    }
    return ArrayList(this)
}

private val IMMUTABLE_LIST_CLASSES = listOf(
    emptyList().javaClass,
    Collections.emptyList().javaClass,
    Collections.singletonList("").javaClass,
)

private val IMMUTABLE_SET_CLASSES = listOf(
    emptySet().javaClass,
    Collections.emptySet().javaClass,
)

private val IMMUTABLE_COLLECTION_CLASSES = IMMUTABLE_LIST_CLASSES + IMMUTABLE_SET_CLASSES

fun Any.isMutableCollection(): Boolean {
    if (this !is Collection<*>) return false
    return !IMMUTABLE_COLLECTION_CLASSES.contains(this.javaClass)
}