Move from java/ to kotlin/ directory

Android 12 dynamic color usage on login screen

app/src/main/kotlin/com/meloda/fast/io/FileStreams.kt

@@ -0,0 +1,96 @@
+package com.meloda.fast.io
+
+import org.jetbrains.annotations.Contract
+import java.io.*
+import java.math.BigInteger
+
+object FileStreams {
+
+    val lineSeparatorChar = lineSeparator()[0]
+
+    const val ONE_KB = 1024
+    const val ONE_MB = ONE_KB * 1024
+    const val ONE_GB = ONE_MB * 1024
+    const val ONE_TB = ONE_GB * 1024L
+    const val ONE_PB = ONE_TB * 1024L
+    const val ONE_EB = ONE_PB * 1024L
+
+    val ONE_ZB: BigInteger = BigInteger.valueOf(ONE_EB).multiply(BigInteger.valueOf(1024L))
+    val ONE_YB: BigInteger = ONE_ZB.multiply(BigInteger.valueOf(1024L))
+
+    @Throws(IOException::class)
+    fun read(from: File?): String {
+        return EasyStreams.read(reader(from))
+    }
+
+    @Throws(IOException::class)
+    fun write(from: String?, to: File?) {
+        EasyStreams.write(from, writer(to))
+    }
+
+    @Throws(IOException::class)
+    fun write(from: ByteArray?, to: File?) {
+        EasyStreams.write(from, FileOutputStream(to))
+    }
+
+    @Throws(IOException::class)
+    fun append(from: ByteArray?, to: File?) {
+        EasyStreams.write(from, FileOutputStream(to, true))
+    }
+
+    @Throws(IOException::class)
+    fun append(from: CharArray?, to: File?) {
+        EasyStreams.write(from, FileWriter(to, true))
+    }
+
+    @Throws(IOException::class)
+    fun append(from: CharSequence, to: File?) {
+        EasyStreams.write(if (from is String) from else from.toString(), FileWriter(to, true))
+    }
+
+    fun delete(dir: File) {
+        if (dir.isDirectory) {
+            val files = dir.listFiles() ?: return
+            for (file in files) {
+                delete(file)
+            }
+        } else {
+            dir.delete()
+        }
+    }
+
+    fun lineSeparator(): String {
+        return System.lineSeparator()
+    }
+
+    fun search(dir: File, name: String?): File? {
+        require(dir.isDirectory) { "dir can't be file." }
+
+        val files = dir.listFiles() ?: return null
+
+        if (files.isEmpty()) {
+            return null
+        }
+
+        for (file in files) {
+            if (file.isDirectory) {
+                search(file, name)
+            } else if (file.name.contains(name!!)) {
+                return file
+            }
+        }
+        return null
+    }
+
+    @Contract("_ -> new")
+    @Throws(FileNotFoundException::class)
+    fun reader(from: File?): Reader {
+        return InputStreamReader(FileInputStream(from), Charsets.UTF_8)
+    }
+
+    @Contract("_ -> new")
+    @Throws(FileNotFoundException::class)
+    fun writer(to: File?): Writer {
+        return OutputStreamWriter(FileOutputStream(to), Charsets.UTF_8)
+    }
+}