New cache system

Refactoring
Separation into libraries

arrayutils/.gitignore

@@ -0,0 +1 @@
+/build

arrayutils/build.gradle

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+plugins {
+    id 'com.android.library'
+    id 'kotlin-android'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.3"
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        coreLibraryDesugaringEnabled true
+
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.core:core-ktx:1.3.2'
+
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.1'
+}

arrayutils/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

arrayutils/src/main/AndroidManifest.xml

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+<?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

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+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)
+    }
+
+}