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/* NSC -- new Scala compiler
* Copyright 2005-2009 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.io
import java.io.{File, FileOutputStream, IOException, InputStream, OutputStream}
import java.net.URL
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(new File(path))
/**
* 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() && file.exists()) new PlainFile(file) else null
/** Returns "getDirectory(new File(path))". */
def getDirectory(path: String): AbstractFile = getDirectory(new File(path))
/**
* 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() && file.exists()) return new PlainFile(file)
if (file.isFile() && file.exists()) {
val path = file.getPath()
if (path.endsWith(".jar") || path.endsWith(".zip"))
return ZipArchive.fromFile(file);
}
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 =
if (url ne null) {
val path = url.getPath()
if (path.endsWith(".jar") || path.endsWith(".zip"))
ZipArchive.fromURL(url)
else
null
}
else
null
}
/**
* <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
/** Returns the containing directory of this abstract file */
def container : AbstractFile
/** Returns the underlying File if any and null otherwise. */
def file: File
/** 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
/** 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 elements: 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 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 = {
val length = path.length()
val separator = File.separatorChar
assert(0 < length && path.lastIndexOf(separator) < length - 1, 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 = file.lookupName(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)
val existing = lookupName(name, false)
if (existing == null) {
val newFile = new File(file, name)
newFile.createNewFile()
new PlainFile(newFile)
} else {
existing
}
}
/**
* Get the subdirectory with a given name, creating it if it
* does not already exist.
*/
def subdirectoryNamed(name: String): AbstractFile = {
assert (isDirectory)
val existing = lookupName(name, true)
if (existing == null) {
val dir = new File(file, name)
dir.mkdir()
new PlainFile(dir)
} else {
existing
}
}
/** Returns the path of this abstract file. */
override def toString() = path
}
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