59 lines
1.5 KiB
Kotlin
59 lines
1.5 KiB
Kotlin
package com.meloda.fast.util
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import java.util.stream.Collectors
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object ArrayUtils {
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@SafeVarargs
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fun <T> asString(vararg array: T): String {
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if (array.isEmpty()) {
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return ""
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}
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val builder = StringBuilder(array.size * 12)
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builder.append(array[0])
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for (i in 1 until array.size) {
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builder.append(',')
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builder.append(array[i])
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}
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return builder.toString()
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}
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fun asString(array: IntArray): String {
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if (array.isEmpty()) {
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return ""
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}
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val builder = StringBuilder(array.size * 12)
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builder.append(array[0])
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for (i in 1 until array.size) {
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builder.append(',')
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builder.append(array[i])
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}
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return builder.toString()
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}
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fun <T> asString(arrayList: ArrayList<T>): String {
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return ArrayList<String>().apply {
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arrayList.forEach { add(it.toString()) }
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}.stream().collect(Collectors.joining(","))
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}
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fun <T> asString(list: List<T>): String = asString(list.asArrayList())
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fun <T> cut(arrayList: ArrayList<T>, offset: Int, count: Int): ArrayList<T> {
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if (arrayList.isEmpty()) return arrayListOf()
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var lastPosition = offset + count
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if (lastPosition > arrayList.size) lastPosition = arrayList.size
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return ArrayList(arrayList.subList(offset, lastPosition))
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}
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fun ByteArray?.isNullOrEmpty() = this == null || this.isEmpty()
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fun <E> List<E>.asArrayList(): ArrayList<E> {
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return ArrayList(this)
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}
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} |