package cc.shinichi.library.tool.file
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import android.content.Context
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import android.os.Environment
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import android.text.TextUtils
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import java.io.*
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import java.nio.channels.FileChannel
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/**
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* @author 工藤
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* @email qinglingou@gmail.com
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*/
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class FileUtil {
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companion object {
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/**
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* 获取可用的cache路径
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*/
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fun getAvailableCacheDir(context: Context): File? {
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val file: File? = if (isExternalStorageWritable) {
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context.externalCacheDir
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} else {
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context.cacheDir
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}
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return file
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}
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private val isExternalStorageWritable: Boolean
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get() {
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val state = Environment.getExternalStorageState()
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return Environment.MEDIA_MOUNTED == state
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}
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/**
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* Return the file by path.
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*
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* @param filePath The path of file.
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* @return the file
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*/
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private fun getFileByPath(filePath: String?): File? {
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return if (isSpace(filePath)) null else filePath?.let { File(it) }
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}
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/**
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* Create a directory if it doesn't exist, otherwise do nothing.
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*
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* @param file The file.
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* @return `true`: exists or creates successfully<br></br>`false`: otherwise
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*/
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private fun createOrExistsDir(file: File?): Boolean {
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return file != null && if (file.exists()) file.isDirectory else file.mkdirs()
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}
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/**
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* Create a file if it doesn't exist, otherwise delete old file before creating.
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*
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* @param filePath The path of file.
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* @return `true`: success<br></br>`false`: fail
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*/
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fun createFileByDeleteOldFile(filePath: String?): Boolean {
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return createFileByDeleteOldFile(getFileByPath(filePath))
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}
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/**
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* Create a file if it doesn't exist, otherwise delete old file before creating.
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*
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* @param file The file.
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* @return `true`: success<br></br>`false`: fail
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*/
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private fun createFileByDeleteOldFile(file: File?): Boolean {
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if (file == null) {
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return false
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}
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// file exists and unsuccessfully delete then return false
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if (file.exists() && !file.delete()) {
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return false
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}
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return if (!createOrExistsDir(file.parentFile)) {
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false
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} else try {
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file.createNewFile()
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} catch (e: IOException) {
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e.printStackTrace()
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false
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}
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}
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private fun isSpace(s: String?): Boolean {
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if (s == null) {
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return true
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}
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var i = 0
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val len = s.length
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while (i < len) {
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if (!Character.isWhitespace(s[i])) {
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return false
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}
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++i
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}
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return true
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}
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/**
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* 根据文件路径拷贝文件
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*
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* @param resourceFile 源文件
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* @param targetPath 目标路径（包含文件名和文件格式）
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* @return boolean 成功true、失败false
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*/
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fun copyFile(resourceFile: File?, targetPath: String, fileName: String): Boolean {
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var result = false
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if (resourceFile == null || TextUtils.isEmpty(targetPath)) {
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return result
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}
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val target = File(targetPath)
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if (target.exists()) {
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target.delete() // 已存在的话先删除
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} else {
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try {
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target.mkdirs()
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} catch (e: Exception) {
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e.printStackTrace()
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}
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}
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val targetFile = File(targetPath + fileName)
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if (targetFile.exists()) {
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targetFile.delete()
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} else {
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try {
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targetFile.createNewFile()
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} catch (e: IOException) {
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e.printStackTrace()
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}
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}
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var resourceChannel: FileChannel? = null
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var targetChannel: FileChannel? = null
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try {
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resourceChannel = FileInputStream(resourceFile).channel
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targetChannel = FileOutputStream(targetFile).channel
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resourceChannel.transferTo(0, resourceChannel.size(), targetChannel)
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result = true
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} catch (e: FileNotFoundException) {
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e.printStackTrace()
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return result
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} catch (e: IOException) {
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e.printStackTrace()
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return result
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}
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try {
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resourceChannel.close()
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targetChannel.close()
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} catch (e: IOException) {
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e.printStackTrace()
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}
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return result
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}
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}
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init {
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throw UnsupportedOperationException("u can't instantiate me...")
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}
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}
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