/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author Martin Odersky
*/
package scala.tools.nsc
package io
import java.io.{ File => JFile, FileOutputStream, IOException, InputStream, OutputStream, BufferedOutputStream }
import java.net.URL
import PartialFunction._
import scala.collection.mutable.ArrayBuffer
/**
* @author Philippe Altherr
* @version 1.0, 23/03/2004
*/
object AbstractFile {
/** Returns "getFile(new File(path))". */
def getFile(path: String): AbstractFile = getFile(Path(path))
def getFile(path: Path): AbstractFile = getFile(path.toFile)
/**
* If the specified File exists and is a regular file, returns an
* abstract regular file backed by it. Otherwise, returns <code>null</code>.
*/
def getFile(file: File): AbstractFile =
if (file.isFile) new PlainFile(file) else null
/** Returns "getDirectory(new File(path))". */
def getDirectory(path: Path): AbstractFile = getDirectory(path.toFile)
/**
* 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 <code>null</code>.
*
* @param file ...
* @return ...
*/
def getDirectory(file: File): AbstractFile =
if (file.isDirectory) new PlainFile(file)
else if (file.isFile && Path.isJarOrZip(file)) ZipArchive fromFile file
else null
/**
* If the specified URL exists and is a readable zip or jar archive,
* returns an abstract directory backed by it. Otherwise, returns
* <code>null</code>.
*
* @param file ...
* @return ...
*/
def getURL(url: URL): AbstractFile =
Option(url) collect { case url: URL if Path.isJarOrZip(url.getPath) => ZipArchive fromURL url } orNull
}
/**
* <p>
* 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.
* </p>
* <p>
* 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.
* </p>
* <p>
* The interface does <b>not</b> allow to access the content.
* The class <code>symtab.classfile.AbstractFileReader</code> accesses
* bytes, knowing that the character set of classfiles is UTF-8. For
* all other cases, the class <code>SourceFile</code> is used, which honors
* <code>global.settings.encoding.value</code>.
* </p>
*/
abstract class AbstractFile extends AnyRef with Iterable[AbstractFile] {
/** Returns the name of this abstract file. */
def name: String
/** Returns the path of this abstract file. */
def path: String
/** Checks extension case insensitively. */
def hasExtension(other: String) = Path(path) hasExtension other
/** 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
def sfile = Option(file) map (x => File(x)) // XXX
/** 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 =
if (file ne null) file.exists
else true
/** Does this abstract file represent something which can contain classfiles? */
def isClassContainer = isDirectory || (sfile exists (Path isJarOrZip _))
/** 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
/** 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 an unbuffered 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
/** returns contents of file (if applicable) in a byte array.
* warning: use <code>Global.getSourceFile()</code> to use the proper
* encoding when converting to the char array .
*
* @throws java.io.IOException
*/
final def toCharArray = new String(toByteArray).toCharArray
/** returns contents of file (if applicable) in a byte array.
*
* @throws java.io.IOException
*/
@throws(classOf[IOException])
final def toByteArray: Array[Byte] = {
val in = input
var rest = sizeOption.get
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
}
/** 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 <code>null</code>. The argument
* <code>directory</code> tells whether to look for a directory or
* a regular file.
*
* @param name ...
* @param directory ...
* @return ...
*/
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
/** Returns the abstract file in this abstract directory with the specified
* path relative to it, If there is no such file, returns null. The argument
* <code>directory</code> tells whether to look for a directory or a regular
* file.
*
* @param path ...
* @param directory ...
* @return ...
*/
def lookupPath(path: String, directory: Boolean): AbstractFile = {
lookup((f, p, dir) => f.lookupName(p, dir), path, directory)
}
/** 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 = JFile.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)
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
}
/**
* 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))
Option(lookupName(name, false)) getOrElse new PlainFile((sfile.get / name).createFile())
}
/**
* 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))
Option(lookupName(name, true)) getOrElse new PlainFile((sfile.get / name).createDirectory())
}
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() = path
}
