private static void registerDefaultProviders() {
if (providers == null || defaultProvider == null) {
// 不使用硬编码包名字符串的方式，重命名包名时常常忘记
String packageName = FilePath.class.getPackage().getName() + ".";
Map<String, FilePath> map = Collections.synchronizedMap(New.<String, FilePath>hashMap());
for (String c :
new String[] {
"FilePathDisk",
"FilePathMem",
"FilePathMemLZF",
"FilePathNioMem",
"FilePathNioMemLZF",
"FilePathSplit",
"FilePathNio",
"FilePathNioMapped",
"FilePathZip"
}) {
try {
FilePath p = (FilePath) Class.forName(packageName + c).newInstance();
map.put(p.getScheme(), p);
if (defaultProvider == null) {
defaultProvider = p;
}
} catch (Exception e) {
// ignore - the files may be excluded in purpose
}
}
providers = map;
}
}
/**
* Create a new temporary file.
*
* @param suffix the suffix
* @param deleteOnExit if the file should be deleted when the virtual machine exists
* @param inTempDir if the file should be stored in the temporary directory
* @return the name of the created file
*/
public FilePath createTempFile(String suffix, boolean deleteOnExit, boolean inTempDir)
throws IOException {
while (true) {
FilePath p = getPath(name + getNextTempFileNamePart(false) + suffix);
if (p.exists() || !p.createFile()) {
// in theory, the random number could collide
getNextTempFileNamePart(true);
continue;
}
p.open("rw").close();
return p;
}
}
/**
* Get the file path object for the given path. Windows-style '\' is replaced with '/'.
*
* @param path the path
* @return the file path object
*/
public static FilePath get(String path) {
path = path.replace('\\', '/');
int index = path.indexOf(':');
registerDefaultProviders();
if (index < 2) {
// use the default provider if no prefix or
// only a single character (drive name)
return defaultProvider.getPath(path);
}
String scheme = path.substring(0, index);
FilePath p = providers.get(scheme);
if (p == null) {
// provider not found - use the default
p = defaultProvider;
}
return p.getPath(path);
}
/**
* Register a file provider.
*
* @param provider the file provider
*/
public static void register(FilePath provider) {
registerDefaultProviders();
providers.put(provider.getScheme(), provider);
}
/**
* Unregister a file provider.
*
* @param provider the file provider
*/
public static void unregister(FilePath provider) {
registerDefaultProviders();
providers.remove(provider.getScheme());
}