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Feat[cc]: unified place for checking directories and parent directories
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60 changes: 56 additions & 4 deletions
60
app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/FileUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,20 +1,72 @@ | ||
| package net.kdt.pojavlaunch.utils; | ||
|
|
||
| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.FileOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.zip.ZipEntry; | ||
| import java.util.zip.ZipInputStream; | ||
|
|
||
| public class FileUtils { | ||
| /** | ||
| * Check if a file denoted by a String path exists. | ||
| * @param filePath the path to check | ||
| * @return whether it exists (same as File.exists() | ||
| */ | ||
| public static boolean exists(String filePath){ | ||
| return new File(filePath).exists(); | ||
| } | ||
|
|
||
| /** | ||
| * Get the file name from a path/URL string. | ||
| * @param pathOrUrl the path or the URL of the file | ||
| * @return the file's name | ||
| */ | ||
| public static String getFileName(String pathOrUrl) { | ||
| int lastSlashIndex = pathOrUrl.lastIndexOf('/'); | ||
| if(lastSlashIndex == -1) return null; | ||
| return pathOrUrl.substring(lastSlashIndex); | ||
| } | ||
|
|
||
| /** | ||
| * Ensure that a directory exists, is a directory and is writable. | ||
| * @param targetFile the directory to check | ||
| * @return if the check has succeeded | ||
| */ | ||
| public static boolean ensureDirectorySilently(File targetFile) { | ||
| if(targetFile.isFile()) return false; | ||
| if(targetFile.exists()) return targetFile.canWrite(); | ||
| else return targetFile.mkdirs(); | ||
|
|
||
| } | ||
|
|
||
| /** | ||
| * Ensure that the parent directory of a file exists and is writable | ||
| * @param targetFile the File whose parent should be checked | ||
| * @return if the check as succeeded | ||
| */ | ||
| public static boolean ensureParentDirectorySilently(File targetFile) { | ||
| File parentFile = targetFile.getParentFile(); | ||
| if(parentFile == null) return false; | ||
| return ensureDirectorySilently(parentFile); | ||
| } | ||
|
|
||
| /** | ||
| * Same as ensureDirectorySilently(), but throws an IOException telling why the check failed. | ||
| * @param targetFile the directory to check | ||
| * @throws IOException when the checks fail | ||
| */ | ||
| public static void ensureDirectory(File targetFile) throws IOException{ | ||
| if(targetFile.isFile()) throw new IOException("Target directory is a file"); | ||
| if(targetFile.exists()) { | ||
| if(!targetFile.canWrite()) throw new IOException("Target directory is not writable"); | ||
| }else if(!targetFile.mkdirs()) throw new IOException("Unable to create target directory"); | ||
| } | ||
|
|
||
| /** | ||
| * Same as ensureParentDirectorySilently(), but throws an IOException telling why the check failed. | ||
| * @param targetFile the File whose parent should be checked | ||
| * @throws IOException when the checks fail | ||
| */ | ||
| public static void ensureParentDirectory(File targetFile) throws IOException{ | ||
| File parentFile = targetFile.getParentFile(); | ||
| if(parentFile == null) throw new IOException("targetFile does not have a parent"); | ||
| ensureDirectory(parentFile); | ||
| } | ||
| } |
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