ewe.io
Class FakeFileSystem

java.lang.Object
  ewe.data.DataObject
      ewe.data.LiveObject
          ewe.data.LiveTreeNode
              ewe.io.FakeFileSystem

All Implemented Interfaces:

Comparable, Copyable, DataUnit, FieldListener, LiveData, MutableTreeNode, TreeNode

public class FakeFileSystem

extends LiveTreeNode

A FakeFileSystem is used to simulate a FileSystem, possibly starting from another read-only File system. The FakeFileSystem provides a File object that can be used to browse and access the FakeFileSystem using the File methods getNew(), getChild() and list().

Usually you would start the FakeFileSystem with entries found in another file storage system like a ZipFile or a EweFile. Then the FakeFileSystem would allow data to be written into the FakeFileSystem - but the data would be written into memory and not into the original system (e.g. ZipFile).

For example, when a Ewe application is being run in a WebBrowser by a Java VM, upon startup the VM looks for a file called "_filesystem.zip" on the server. If that file is found it is used as the start of the FakeFileSystem and the default file system for the application then becomes that FileSystem. Here is an excerpt from the source code that does this:

        try{
                ewe.zip.ZipFile zf = new ewe.zip.ZipFile(ewe.sys.Vm.openRandomAccessStream("_filesystem.zip","r"));
                System.out.println("Loading virtual file system.");
                ewe.zip.ZipEntryFile zef = new ewe.zip.ZipEntryFile(zf);
                fileSystem = new ewe.io.FakeFileSystem();
                fileSystem.addVolume("Disk1",zef.getNew("/"));
                zf.close();
        }catch(IOException e){} //No virtual file system found.

The addVolume() method is used to add a volume (simulated root drive) to the FakeFileSystem and the method getFile() returns a File object that can be used to access the FakeFileSystem.

Field Summary

String	deviceName This is the name of the File system which by default is "Virtual File System".
PropertyList	sorted
PropertyList	unsortedNames

Fields inherited from class ewe.data.LiveTreeNode

children, parent

Constructor Summary

FakeFileSystem()

Method Summary

void	addVolume(String systemName, File root)
String	defaultVolume()
int	find(String name)
ewe.io.FakeFileSystem.FileNode	findNode(String name)
File	getFile()
static void	main(String[] args)
protected void	sortNames()

Methods inherited from class ewe.data.LiveTreeNode

addChild, addressOfChild, addressOfChild, addressOfChild, canExpand, collapse, expand, findNamedChild, getChild, getChildAt, getChildAt, getChildCount, getChildren, getParent, getParent, getSibling, indexOfChild, insertChild, isLeaf, isNamed, removeChild, setParent

Methods inherited from class ewe.data.LiveObject

action, action, addMeToPanel, addObjectToPanel, addToPanel, decode, decoded, decodeFields, enableEditorScrolling, encode, encoded, encodeFields, fieldChanged, fieldChanged, fieldEvent, getEditor, getEditorScroller, getIcon, getName, input, makeNewEditor, runAsApp, textDecode, textEncode

Methods inherited from class ewe.data.DataObject

_getSetField, appendAllFields, compareTo, copied, copyFrom, equals, getCopy, getDeclaredField, getDeclaredFieldValue, getDeclaredFieldValue, getFieldList, getFieldList, getMyFieldList, getNew

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, toString

Methods inherited from interface ewe.data.DataUnit

copyFrom, getNew

Methods inherited from interface ewe.util.Copyable

getCopy

Methods inherited from interface ewe.util.Comparable

compareTo

Field Detail

deviceName

public String deviceName

This is the name of the File system which by default is "Virtual File System". You can change this to be anything else.

unsortedNames

public PropertyList unsortedNames

sorted

public PropertyList sorted

Constructor Detail

FakeFileSystem

public FakeFileSystem()

Method Detail

addVolume

public void addVolume(String systemName,
                      File root)

getFile

public File getFile()

defaultVolume

public String defaultVolume()

sortNames

protected void sortNames()

find

public int find(String name)

findNode

public ewe.io.FakeFileSystem.FileNode findNode(String name)

main

public static void main(String[] args)