New cache system

Refactoring
Separation into libraries

arrayutils/src/main/AndroidManifest.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.meloda.arrayutils">
+
+</manifest>

arrayutils/src/main/java/com/meloda/arrayutils/ArrayUtils.kt

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