dotty.tools.io.AbstractFile.scala Maven / Gradle / Ivy
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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
*/
package dotty.tools.io
import java.io.{
IOException, InputStream, OutputStream, BufferedOutputStream,
ByteArrayOutputStream
}
import java.net.URL
import java.nio.file.{Files, Paths}
/**
* An abstraction over files for use in the reflection/compiler libraries.
*
* ''Note: This library is considered experimental and should not be used unless you know what you are doing.''
*
* @author Philippe Altherr
* @version 1.0, 23/03/2004
*/
object AbstractFile {
def getFile(path: String): AbstractFile = getFile(File(path))
def getDirectory(path: String): AbstractFile = getDirectory(Directory(path))
def getFile(path: JPath): AbstractFile = getFile(File(path))
def getDirectory(path: JPath): AbstractFile = getDirectory(Directory(path))
/**
* If the specified File exists and is a regular file, returns an
* abstract regular file backed by it. Otherwise, returns `null`.
*/
def getFile(path: Path): AbstractFile =
if (path.isFile) new PlainFile(path) else null
/**
* If the specified File exists and is either a directory or a
* readable zip or jar archive, returns an abstract directory
* backed by it. Otherwise, returns `null`.
*/
def getDirectory(path: Path): AbstractFile =
if (path.isDirectory) new PlainFile(path)
else if (path.isFile && Path.isExtensionJarOrZip(path.jpath)) ZipArchive fromFile path.toFile
else null
/**
* If the specified URL exists and is a regular file or a directory, returns an
* abstract regular file or an abstract directory, respectively, backed by it.
* Otherwise, returns `null`.
*/
def getURL(url: URL): AbstractFile =
if (url.getProtocol != "file") null
else new PlainFile(new Path(Paths.get(url.toURI)))
def getResources(url: URL): AbstractFile = ZipArchive fromManifestURL url
}
/**
*
* This class and its children serve to unify handling of files and
* directories. These files and directories may or may not have some
* real counter part within the file system. For example, some file
* handles reference files within a zip archive or virtual ones
* that exist only in memory.
*
*
* Every abstract file has a path (i.e. a full name) and a name
* (i.e. a short name) and may be backed by some real File. There are
* two different kinds of abstract files: regular files and
* directories. Regular files may be read and have a last modification
* time. Directories may list their content and look for subfiles with
* a specified name or path and of a specified kind.
*
*
* The interface does not allow to access the content.
* The class `symtab.classfile.AbstractFileReader` accesses
* bytes, knowing that the character set of classfiles is UTF-8. For
* all other cases, the class `SourceFile` is used, which honors
* `global.settings.encoding.value`.
*
*
* ''Note: This library is considered experimental and should not be used unless you know what you are doing.''
*/
abstract class AbstractFile extends Iterable[AbstractFile] {
/** Returns the name of this abstract file. */
def name: String
/** Returns the path of this abstract file. */
def path: String
/** Returns the absolute path of this abstract file. */
def absolutePath: String = path
/** Returns the path of this abstract file in a canonical form. */
def canonicalPath: String = if (jpath == null) path else jpath.normalize.toString
/** Checks extension case insensitively. */
def hasExtension(other: String): Boolean = extension == other.toLowerCase
val extension: String = Path.extension(name)
/** The absolute file, if this is a relative file. */
def absolute: AbstractFile
/** Returns the containing directory of this abstract file */
def container : AbstractFile
/** Returns the underlying File if any and null otherwise. */
def file: JFile = try {
if (jpath == null) null
else jpath.toFile
} catch {
case _: UnsupportedOperationException => null
}
/** Returns the underlying Path if any and null otherwise. */
def jpath: JPath
/** An underlying source, if known. Mostly, a zip/jar file. */
def underlyingSource: Option[AbstractFile] = None
/** Does this abstract file denote an existing file? */
def exists: Boolean = {
(jpath eq null) || Files.exists(jpath)
}
/** Does this abstract file represent something which can contain classfiles? */
def isClassContainer: Boolean = isDirectory || (jpath != null && (extension == "jar" || extension == "zip"))
/** Create a file on disk, if one does not exist already. */
def create(): Unit
/** Delete the underlying file or directory (recursively). */
def delete(): Unit
/** Is this abstract file a directory? */
def isDirectory: Boolean
/** Does this abstract file correspond to something on-disk? */
def isVirtual: Boolean = false
/** Returns the time that this abstract file was last modified. */
def lastModified: Long
/** returns an input stream so the file can be read */
def input: InputStream
/** Returns an output stream for writing the file */
def output: OutputStream
/** Returns a buffered output stream for writing the file - defaults to out */
def bufferedOutput: BufferedOutputStream = new BufferedOutputStream(output)
/** size of this file if it is a concrete file. */
def sizeOption: Option[Int] = None
def toURL: URL = if (jpath == null) null else jpath.toUri.toURL
/** Returns contents of file (if applicable) in a Char array.
* warning: use `Global.getSourceFile()` to use the proper
* encoding when converting to the char array.
*/
@throws(classOf[IOException])
def toCharArray: Array[Char] = new String(toByteArray).toCharArray
/** Returns contents of file (if applicable) in a byte array.
*/
@throws(classOf[IOException])
def toByteArray: Array[Byte] = {
val in = input
sizeOption match {
case Some(size) =>
var rest = size
val arr = new Array[Byte](rest)
while (rest > 0) {
val res = in.read(arr, arr.length - rest, rest)
if (res == -1)
throw new IOException("read error")
rest -= res
}
in.close()
arr
case None =>
val out = new ByteArrayOutputStream()
var c = in.read()
while(c != -1) {
out.write(c)
c = in.read()
}
in.close()
out.toByteArray()
}
}
/** Returns all abstract subfiles of this abstract directory. */
def iterator(): Iterator[AbstractFile]
/** Returns the abstract file in this abstract directory with the specified
* name. If there is no such file, returns `null`. The argument
* `directory` tells whether to look for a directory or
* a regular file.
*/
def lookupName(name: String, directory: Boolean): AbstractFile
/** Returns an abstract file with the given name. It does not
* check that it exists.
*/
def lookupNameUnchecked(name: String, directory: Boolean): AbstractFile
/** Return an abstract file that does not check that `path` denotes
* an existing file.
*/
def lookupPathUnchecked(path: String, directory: Boolean): AbstractFile = {
lookup((f, p, dir) => f.lookupNameUnchecked(p, dir), path, directory)
}
private def lookup(getFile: (AbstractFile, String, Boolean) => AbstractFile,
path0: String,
directory: Boolean): AbstractFile = {
val separator = java.io.File.separatorChar
// trim trailing '/'s
val path: String = if (path0.last == separator) path0 dropRight 1 else path0
val length = path.length()
assert(length > 0 && !(path.last == separator), path)
var file = this
var start = 0
while (true) {
val index = path.indexOf(separator, start)
assert(index < 0 || start < index, ((path, directory, start, index)))
val name = path.substring(start, if (index < 0) length else index)
file = getFile(file, name, if (index < 0) directory else true)
if ((file eq null) || index < 0) return file
start = index + 1
}
file
}
private def fileOrSubdirectoryNamed(name: String, isDir: Boolean): AbstractFile = {
val lookup = lookupName(name, isDir)
if (lookup != null) lookup
else {
Files.createDirectories(jpath)
val path = jpath.resolve(name)
if (isDir) Files.createDirectory(path)
else Files.createFile(path)
new PlainFile(new File(path))
}
}
/**
* Get the file in this directory with the given name,
* creating an empty file if it does not already existing.
*/
def fileNamed(name: String): AbstractFile = {
assert(isDirectory, "Tried to find '%s' in '%s' but it is not a directory".format(name, path))
fileOrSubdirectoryNamed(name, isDir = false)
}
/**
* Get the subdirectory with a given name, creating it if it
* does not already exist.
*/
def subdirectoryNamed(name: String): AbstractFile = {
assert (isDirectory, "Tried to find '%s' in '%s' but it is not a directory".format(name, path))
fileOrSubdirectoryNamed(name, isDir = true)
}
protected def unsupported(): Nothing = unsupported(null)
protected def unsupported(msg: String): Nothing = throw new UnsupportedOperationException(msg)
/** Returns the path of this abstract file. */
override def toString(): String = path
}
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