src/Tools/jEdit/src/jedit/VFS.scala
author wenzelm
Sun, 19 Oct 2008 18:26:37 +0200
changeset 34319 eaac45c45348
parent 34318 c13e168a8ae6
child 34337 5d5b69f2956b
permissions -rw-r--r--
explicit result type for _listFiles;
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package isabelle.jedit
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import java.io.InputStream
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import java.io.OutputStream
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import java.io.ByteArrayInputStream
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import java.io.ByteArrayOutputStream
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import java.io.InputStreamReader
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import java.awt.Component
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import isabelle.Symbol.Interpretation
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import org.gjt.sp.jedit.Buffer
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import org.gjt.sp.jedit.View
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import org.gjt.sp.jedit.io
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import org.gjt.sp.jedit.io.VFSFile
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import org.gjt.sp.jedit.io.VFSManager
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object VFS {
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  val converter = new Interpretation()
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  val BUFFER_SIZE = 1024
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  def inputConverter(in : InputStream) = {
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    val reader = new InputStreamReader(in, "UTF-8")
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    val buffer = new StringBuffer()
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    val array = new Array[Char](BUFFER_SIZE)
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    var finished = false
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    while (! finished) {
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      val length = reader.read(array, 0, array.length)
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      if (length == -1)
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        finished = true
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      else
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        buffer.append(array, 0, length)
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    }
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    val str = converter.decode(buffer.toString())
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    new ByteArrayInputStream(str.getBytes())
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  }
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  class OutputConverter(out : OutputStream) extends ByteArrayOutputStream {
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    override def close() {
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      out.write(converter.encode(new String(buf, 0, count)).getBytes())
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      out.close()
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    }
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  }
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  def mapFile(vfs : VFS, base : VFSFile) =
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    if (base == null) null else new File(vfs, base)
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  class File(vfs : VFS, base : VFSFile) extends VFSFile {
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    override def getColor() = 
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      base.getColor()
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    override def getDeletePath() = 
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      base.getDeletePath()
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    override def getExtendedAttribute(name : String) =
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      base.getExtendedAttribute(name)
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    override def getIcon(expanded : Boolean, openBuffer : Boolean) = 
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      base.getIcon(expanded, openBuffer)
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    override def getLength() = 
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      base.getLength()  
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    override def getName() =
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      base.getName()
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    override def getPath() =
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      "isa:" + base.getPath()
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    override def getSymlinkPath() =
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      base.getSymlinkPath()
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    override def getType() =
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      base.getType()
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    override def getVFS() =
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      vfs
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    override def isBinary(session : Object) =
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      base.isBinary(session)
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    override def isHidden() =
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      base.isHidden()
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    override def isReadable() =
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      base.isReadable()
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    override def isWriteable() =
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      base.isWriteable()
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    override def setDeletePath(path : String) =
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      base.setDeletePath(path)
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    override def setHidden(hidden : Boolean) =
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      base.setHidden(hidden)
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    override def setLength(length : Long) =
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      base.setLength(length)
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    override def setName(name : String) =
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      base.setName(name)
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    override def setPath(path : String) =
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      base.setPath(path)
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    override def setReadable(readable : Boolean) =
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      base.setReadable(readable)
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    override def setWriteable(writeable : Boolean) =
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      base.setWriteable(writeable)
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    override def setSymlinkPath(symlinkPath : String) =
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      base.setSymlinkPath(symlinkPath)
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    override def setType(fType : Int) =
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      base.setType(fType)
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  } 
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}
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/**
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 * The Isabelle virtual file system for jEdit.
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 * 
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 * This filesystem passes every operation on to FileVFS. Just the read and write
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 * operations are overwritten to convert the xsymbols to unicode on read and
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 * unicode to xsymbols on write.
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 * 
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 * @author Johannes Hölzl <hoelzl@in.tum.de>
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 */
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class VFS extends io.VFS("isa", VFSManager.getVFSForProtocol("file").getCapabilities()) {
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  private var baseVFS = VFSManager.getVFSForProtocol("file") 
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  private def cutPath(path : String) = 
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    if (path.startsWith("isa:")) path.substring(4) else path
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  override def createVFSSession(path : String, comp : Component) = 
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    baseVFS.createVFSSession(cutPath(path), comp)
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  override def getCapabilities() = 
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    baseVFS.getCapabilities()
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  override def getExtendedAttributes() = 
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    baseVFS.getExtendedAttributes()
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  override def getParentOfPath(path : String) = 
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    "isa:" + baseVFS.getParentOfPath(cutPath(path))
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  override def constructPath(parent : String, path : String) = 
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    "isa:" + baseVFS.constructPath(cutPath(parent), path)
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  override def getFileName(path : String) = 
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    baseVFS.getFileName(path)
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  override def getFileSeparator() = 
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    baseVFS.getFileSeparator()
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  override def getTwoStageSaveName(path : String) = 
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    "isa:" + baseVFS.getTwoStageSaveName(cutPath(path))
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  override def _canonPath(session : Object, path : String, comp : Component) =
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    "isa:" + baseVFS._canonPath(session, cutPath(path), comp)
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  override def _createInputStream(session : Object, path : String,
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                                  ignoreErrors : Boolean, comp : Component) =
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    VFS.inputConverter(baseVFS._createInputStream(session, cutPath(path), 
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                                                  ignoreErrors, comp))
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  override def _createOutputStream(session : Object, path : String,
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                                   comp : Component) =
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    new VFS.OutputConverter(baseVFS._createOutputStream(session, cutPath(path), comp))
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  override def _delete(session : Object, path : String, comp : Component) =
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    baseVFS._delete(session, cutPath(path), comp)
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  override def _getFile(session : Object, path : String, comp : Component) =
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    VFS.mapFile(this, baseVFS._getFile(session, cutPath(path), comp))
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34319
eaac45c45348 explicit result type for _listFiles;
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  override def _listFiles(session : Object, path : String, comp :  Component): Array[VFSFile] =
34318
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    (baseVFS._listFiles(session, cutPath(path), comp)
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            .map(file => VFS.mapFile(this, file)))
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  override def _mkdir(session : Object, path : String, comp : Component) =
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    baseVFS._mkdir(session, cutPath(path), comp)
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  override def _rename(session : Object, from : String, to : String,
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                       comp : Component) =
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    baseVFS._rename(session, cutPath(from), cutPath(to), comp)
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  override def _backup(session : Object, path : String, comp : Component) =
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    baseVFS._backup(session, cutPath(path), comp);
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  override def _saveComplete(session : Object, buffer : Buffer, path : String,
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                             comp : Component) =
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    baseVFS._saveComplete(session, buffer, cutPath(path), comp)
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}