You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@commons.apache.org by Bakary Dialaya DJIBA <di...@gmail.com> on 2008/09/23 21:37:46 UTC
[ understand VFS ]
Hi,
Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo *(extends
AbstractFO), how can I attach the fo to the fs?
It's a silly question. I am trying to create a provider that I'll add to
the default manager (of VFS). The provider is added successfully but I
cannot make a link between *fs* and *fo*.
To do this I write the code below:
DefaultFileSystemManager manager new DefaultFileSystemManager();
MyProvider provider = new MyProvider();
FileSystemOptions fileSystemOptions = new FileSystemOptions();
manager.addProvider("sch", provider);
manager.init();
CustomFileObject fo = (CustomFileObject)manager.resolveFile("sch:/");
CustomFileName fn = new CustomFileName("sch", "userName",FileType.FOLDER);
CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
fs.attach(fo);
System.out.println(fo.isAttached()); // return false
fo.doAttach();
System.out.println(fo.isAttached()); // return false
My second problème is that I don't know how to set my root file system. And
also fo.getParent() throw a null pointer exception.
Someone can tell me how to do this:
FS
|__FileObject1 ...
|
|__FileObject2 ...
or give me a tutorial to understand VFS API.
Thanks & Regards.
--
Bakary,
Re: [ understand VFS ]
Posted by Bakary Dialaya DJIBA <di...@gmail.com>.
sorry its a mistake, I mean userFolder.getChildren() throw that exception.
thanks,
On Wed, Sep 24, 2008 at 4:23 PM, James Carman <ja...@carmanconsulting.com>wrote:
> You weren't asking for the children of a folder when you did
> userFile.getChildren(). The userFile FileObject is a file, not a
> folder.
>
> On Wed, Sep 24, 2008 at 10:19 AM, Bakary Dialaya DJIBA
> <di...@gmail.com> wrote:
> > Based on this example,
> >>>FileObject rootDir = manager.resolveFile("sch:/");
> >>> FileObject userFolder = rootDir.resolveFile(userName);
> >>> userFolder.createFolder();
> >>> FileObject userFile = userFolder.resolveFile("anotherFolder");
> >>> userFile.createFolder();
> >
> > userFile.getChildren() throws a null Pointer Exception:
> > org.apache.commons.vfs.FileSystemException: Could not list the contents
> of
> > folder "sch:///bakary".
> > at
> >
> org.apache.commons.vfs.provider.AbstractFileObject.getChildren(AbstractFileObject.java:592)
> >
> > How can I get the children of userFolder, please?
> >
> >
> >
> > On Wed, Sep 24, 2008 at 12:21 PM, James Carman
> > <ja...@carmanconsulting.com>wrote:
> >
> >> No problem. Glad to help!
> >>
> >> On Wed, Sep 24, 2008 at 4:15 AM, Bakary Dialaya DJIBA <
> dialaya@gmail.com>
> >> wrote:
> >> > It works well.
> >> > Thanks.
> >> >
> >> > On Wed, Sep 24, 2008 at 2:10 AM, James Carman <
> >> james@carmanconsulting.com>wrote:
> >> >
> >> >> I wouldn't do any downcasting if you want it to be generic. Use the
> >> >> FileObject API:
> >> >>
> >> >> FileObject rootDir = manager.resolveFile("sch:/");
> >> >> FileObject userFolder = rootDir.resolveFile(userName);
> >> >> userFolder.createFolder();
> >> >> FileObject userFile = userFolder.resolveFile("MyFile.txt");
> >> >> userFile.createFile();
> >> >>
> >> >> To get stuff into this "user file", you can use:
> >> >>
> >> >> File localFile = ...;
> >> >> FileObject localFileObject = manager.toFileObject(localFile);
> >> >> FileUtil.copyContent(localFileObject,userFile);
> >> >>
> >> >> On Tue, Sep 23, 2008 at 3:37 PM, Bakary Dialaya DJIBA <
> >> dialaya@gmail.com>
> >> >> wrote:
> >> >> > Hi,
> >> >> >
> >> >> > Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo
> >> >> *(extends
> >> >> > AbstractFO), how can I attach the fo to the fs?
> >> >> >
> >> >> > It's a silly question. I am trying to create a provider that I'll
> add
> >> to
> >> >> > the default manager (of VFS). The provider is added successfully
> but I
> >> >> > cannot make a link between *fs* and *fo*.
> >> >> >
> >> >> > To do this I write the code below:
> >> >> >
> >> >> > DefaultFileSystemManager manager new DefaultFileSystemManager();
> >> >> > MyProvider provider = new MyProvider();
> >> >> > FileSystemOptions fileSystemOptions = new FileSystemOptions();
> >> >> >
> >> >> > manager.addProvider("sch", provider);
> >> >> > manager.init();
> >> >> >
> >> >> > CustomFileObject fo =
> (CustomFileObject)manager.resolveFile("sch:/");
> >> >> >
> >> >> > CustomFileName fn = new CustomFileName("sch",
> >> >> "userName",FileType.FOLDER);
> >> >> >
> >> >> > CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
> >> >> > fs.attach(fo);
> >> >> > System.out.println(fo.isAttached()); // return false
> >> >> > fo.doAttach();
> >> >> > System.out.println(fo.isAttached()); // return false
> >> >> >
> >> >> >
> >> >> > My second problème is that I don't know how to set my root file
> >> system.
> >> >> And
> >> >> > also fo.getParent() throw a null pointer exception.
> >> >> >
> >> >> > Someone can tell me how to do this:
> >> >> >
> >> >> > FS
> >> >> > |__FileObject1 ...
> >> >> > |
> >> >> > |__FileObject2 ...
> >> >> >
> >> >> > or give me a tutorial to understand VFS API.
> >> >> >
> >> >> > Thanks & Regards.
> >> >> >
> >> >> >
> >> >> > --
> >> >> > Bakary,
> >> >> >
> >> >>
> >> >> ---------------------------------------------------------------------
> >> >> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> >> >> For additional commands, e-mail: user-help@commons.apache.org
> >> >>
> >> >>
> >> >
> >> >
> >> > --
> >> > Bakary,
> >> >
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> >> For additional commands, e-mail: user-help@commons.apache.org
> >>
> >>
> >
> >
> > --
> > Bakary,
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
--
Bakary,
Re: [ understand VFS ]
Posted by James Carman <ja...@carmanconsulting.com>.
You weren't asking for the children of a folder when you did
userFile.getChildren(). The userFile FileObject is a file, not a
folder.
On Wed, Sep 24, 2008 at 10:19 AM, Bakary Dialaya DJIBA
<di...@gmail.com> wrote:
> Based on this example,
>>>FileObject rootDir = manager.resolveFile("sch:/");
>>> FileObject userFolder = rootDir.resolveFile(userName);
>>> userFolder.createFolder();
>>> FileObject userFile = userFolder.resolveFile("anotherFolder");
>>> userFile.createFolder();
>
> userFile.getChildren() throws a null Pointer Exception:
> org.apache.commons.vfs.FileSystemException: Could not list the contents of
> folder "sch:///bakary".
> at
> org.apache.commons.vfs.provider.AbstractFileObject.getChildren(AbstractFileObject.java:592)
>
> How can I get the children of userFolder, please?
>
>
>
> On Wed, Sep 24, 2008 at 12:21 PM, James Carman
> <ja...@carmanconsulting.com>wrote:
>
>> No problem. Glad to help!
>>
>> On Wed, Sep 24, 2008 at 4:15 AM, Bakary Dialaya DJIBA <di...@gmail.com>
>> wrote:
>> > It works well.
>> > Thanks.
>> >
>> > On Wed, Sep 24, 2008 at 2:10 AM, James Carman <
>> james@carmanconsulting.com>wrote:
>> >
>> >> I wouldn't do any downcasting if you want it to be generic. Use the
>> >> FileObject API:
>> >>
>> >> FileObject rootDir = manager.resolveFile("sch:/");
>> >> FileObject userFolder = rootDir.resolveFile(userName);
>> >> userFolder.createFolder();
>> >> FileObject userFile = userFolder.resolveFile("MyFile.txt");
>> >> userFile.createFile();
>> >>
>> >> To get stuff into this "user file", you can use:
>> >>
>> >> File localFile = ...;
>> >> FileObject localFileObject = manager.toFileObject(localFile);
>> >> FileUtil.copyContent(localFileObject,userFile);
>> >>
>> >> On Tue, Sep 23, 2008 at 3:37 PM, Bakary Dialaya DJIBA <
>> dialaya@gmail.com>
>> >> wrote:
>> >> > Hi,
>> >> >
>> >> > Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo
>> >> *(extends
>> >> > AbstractFO), how can I attach the fo to the fs?
>> >> >
>> >> > It's a silly question. I am trying to create a provider that I'll add
>> to
>> >> > the default manager (of VFS). The provider is added successfully but I
>> >> > cannot make a link between *fs* and *fo*.
>> >> >
>> >> > To do this I write the code below:
>> >> >
>> >> > DefaultFileSystemManager manager new DefaultFileSystemManager();
>> >> > MyProvider provider = new MyProvider();
>> >> > FileSystemOptions fileSystemOptions = new FileSystemOptions();
>> >> >
>> >> > manager.addProvider("sch", provider);
>> >> > manager.init();
>> >> >
>> >> > CustomFileObject fo = (CustomFileObject)manager.resolveFile("sch:/");
>> >> >
>> >> > CustomFileName fn = new CustomFileName("sch",
>> >> "userName",FileType.FOLDER);
>> >> >
>> >> > CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
>> >> > fs.attach(fo);
>> >> > System.out.println(fo.isAttached()); // return false
>> >> > fo.doAttach();
>> >> > System.out.println(fo.isAttached()); // return false
>> >> >
>> >> >
>> >> > My second problème is that I don't know how to set my root file
>> system.
>> >> And
>> >> > also fo.getParent() throw a null pointer exception.
>> >> >
>> >> > Someone can tell me how to do this:
>> >> >
>> >> > FS
>> >> > |__FileObject1 ...
>> >> > |
>> >> > |__FileObject2 ...
>> >> >
>> >> > or give me a tutorial to understand VFS API.
>> >> >
>> >> > Thanks & Regards.
>> >> >
>> >> >
>> >> > --
>> >> > Bakary,
>> >> >
>> >>
>> >> ---------------------------------------------------------------------
>> >> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
>> >> For additional commands, e-mail: user-help@commons.apache.org
>> >>
>> >>
>> >
>> >
>> > --
>> > Bakary,
>> >
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
>> For additional commands, e-mail: user-help@commons.apache.org
>>
>>
>
>
> --
> Bakary,
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [ understand VFS ]
Posted by Bakary Dialaya DJIBA <di...@gmail.com>.
Based on this example,
>>FileObject rootDir = manager.resolveFile("sch:/");
>> FileObject userFolder = rootDir.resolveFile(userName);
>> userFolder.createFolder();
>> FileObject userFile = userFolder.resolveFile("anotherFolder");
>> userFile.createFolder();
userFile.getChildren() throws a null Pointer Exception:
org.apache.commons.vfs.FileSystemException: Could not list the contents of
folder "sch:///bakary".
at
org.apache.commons.vfs.provider.AbstractFileObject.getChildren(AbstractFileObject.java:592)
How can I get the children of userFolder, please?
On Wed, Sep 24, 2008 at 12:21 PM, James Carman
<ja...@carmanconsulting.com>wrote:
> No problem. Glad to help!
>
> On Wed, Sep 24, 2008 at 4:15 AM, Bakary Dialaya DJIBA <di...@gmail.com>
> wrote:
> > It works well.
> > Thanks.
> >
> > On Wed, Sep 24, 2008 at 2:10 AM, James Carman <
> james@carmanconsulting.com>wrote:
> >
> >> I wouldn't do any downcasting if you want it to be generic. Use the
> >> FileObject API:
> >>
> >> FileObject rootDir = manager.resolveFile("sch:/");
> >> FileObject userFolder = rootDir.resolveFile(userName);
> >> userFolder.createFolder();
> >> FileObject userFile = userFolder.resolveFile("MyFile.txt");
> >> userFile.createFile();
> >>
> >> To get stuff into this "user file", you can use:
> >>
> >> File localFile = ...;
> >> FileObject localFileObject = manager.toFileObject(localFile);
> >> FileUtil.copyContent(localFileObject,userFile);
> >>
> >> On Tue, Sep 23, 2008 at 3:37 PM, Bakary Dialaya DJIBA <
> dialaya@gmail.com>
> >> wrote:
> >> > Hi,
> >> >
> >> > Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo
> >> *(extends
> >> > AbstractFO), how can I attach the fo to the fs?
> >> >
> >> > It's a silly question. I am trying to create a provider that I'll add
> to
> >> > the default manager (of VFS). The provider is added successfully but I
> >> > cannot make a link between *fs* and *fo*.
> >> >
> >> > To do this I write the code below:
> >> >
> >> > DefaultFileSystemManager manager new DefaultFileSystemManager();
> >> > MyProvider provider = new MyProvider();
> >> > FileSystemOptions fileSystemOptions = new FileSystemOptions();
> >> >
> >> > manager.addProvider("sch", provider);
> >> > manager.init();
> >> >
> >> > CustomFileObject fo = (CustomFileObject)manager.resolveFile("sch:/");
> >> >
> >> > CustomFileName fn = new CustomFileName("sch",
> >> "userName",FileType.FOLDER);
> >> >
> >> > CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
> >> > fs.attach(fo);
> >> > System.out.println(fo.isAttached()); // return false
> >> > fo.doAttach();
> >> > System.out.println(fo.isAttached()); // return false
> >> >
> >> >
> >> > My second problème is that I don't know how to set my root file
> system.
> >> And
> >> > also fo.getParent() throw a null pointer exception.
> >> >
> >> > Someone can tell me how to do this:
> >> >
> >> > FS
> >> > |__FileObject1 ...
> >> > |
> >> > |__FileObject2 ...
> >> >
> >> > or give me a tutorial to understand VFS API.
> >> >
> >> > Thanks & Regards.
> >> >
> >> >
> >> > --
> >> > Bakary,
> >> >
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> >> For additional commands, e-mail: user-help@commons.apache.org
> >>
> >>
> >
> >
> > --
> > Bakary,
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
--
Bakary,
Re: [ understand VFS ]
Posted by James Carman <ja...@carmanconsulting.com>.
No problem. Glad to help!
On Wed, Sep 24, 2008 at 4:15 AM, Bakary Dialaya DJIBA <di...@gmail.com> wrote:
> It works well.
> Thanks.
>
> On Wed, Sep 24, 2008 at 2:10 AM, James Carman <ja...@carmanconsulting.com>wrote:
>
>> I wouldn't do any downcasting if you want it to be generic. Use the
>> FileObject API:
>>
>> FileObject rootDir = manager.resolveFile("sch:/");
>> FileObject userFolder = rootDir.resolveFile(userName);
>> userFolder.createFolder();
>> FileObject userFile = userFolder.resolveFile("MyFile.txt");
>> userFile.createFile();
>>
>> To get stuff into this "user file", you can use:
>>
>> File localFile = ...;
>> FileObject localFileObject = manager.toFileObject(localFile);
>> FileUtil.copyContent(localFileObject,userFile);
>>
>> On Tue, Sep 23, 2008 at 3:37 PM, Bakary Dialaya DJIBA <di...@gmail.com>
>> wrote:
>> > Hi,
>> >
>> > Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo
>> *(extends
>> > AbstractFO), how can I attach the fo to the fs?
>> >
>> > It's a silly question. I am trying to create a provider that I'll add to
>> > the default manager (of VFS). The provider is added successfully but I
>> > cannot make a link between *fs* and *fo*.
>> >
>> > To do this I write the code below:
>> >
>> > DefaultFileSystemManager manager new DefaultFileSystemManager();
>> > MyProvider provider = new MyProvider();
>> > FileSystemOptions fileSystemOptions = new FileSystemOptions();
>> >
>> > manager.addProvider("sch", provider);
>> > manager.init();
>> >
>> > CustomFileObject fo = (CustomFileObject)manager.resolveFile("sch:/");
>> >
>> > CustomFileName fn = new CustomFileName("sch",
>> "userName",FileType.FOLDER);
>> >
>> > CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
>> > fs.attach(fo);
>> > System.out.println(fo.isAttached()); // return false
>> > fo.doAttach();
>> > System.out.println(fo.isAttached()); // return false
>> >
>> >
>> > My second problème is that I don't know how to set my root file system.
>> And
>> > also fo.getParent() throw a null pointer exception.
>> >
>> > Someone can tell me how to do this:
>> >
>> > FS
>> > |__FileObject1 ...
>> > |
>> > |__FileObject2 ...
>> >
>> > or give me a tutorial to understand VFS API.
>> >
>> > Thanks & Regards.
>> >
>> >
>> > --
>> > Bakary,
>> >
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
>> For additional commands, e-mail: user-help@commons.apache.org
>>
>>
>
>
> --
> Bakary,
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [ understand VFS ]
Posted by Bakary Dialaya DJIBA <di...@gmail.com>.
It works well.
Thanks.
On Wed, Sep 24, 2008 at 2:10 AM, James Carman <ja...@carmanconsulting.com>wrote:
> I wouldn't do any downcasting if you want it to be generic. Use the
> FileObject API:
>
> FileObject rootDir = manager.resolveFile("sch:/");
> FileObject userFolder = rootDir.resolveFile(userName);
> userFolder.createFolder();
> FileObject userFile = userFolder.resolveFile("MyFile.txt");
> userFile.createFile();
>
> To get stuff into this "user file", you can use:
>
> File localFile = ...;
> FileObject localFileObject = manager.toFileObject(localFile);
> FileUtil.copyContent(localFileObject,userFile);
>
> On Tue, Sep 23, 2008 at 3:37 PM, Bakary Dialaya DJIBA <di...@gmail.com>
> wrote:
> > Hi,
> >
> > Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo
> *(extends
> > AbstractFO), how can I attach the fo to the fs?
> >
> > It's a silly question. I am trying to create a provider that I'll add to
> > the default manager (of VFS). The provider is added successfully but I
> > cannot make a link between *fs* and *fo*.
> >
> > To do this I write the code below:
> >
> > DefaultFileSystemManager manager new DefaultFileSystemManager();
> > MyProvider provider = new MyProvider();
> > FileSystemOptions fileSystemOptions = new FileSystemOptions();
> >
> > manager.addProvider("sch", provider);
> > manager.init();
> >
> > CustomFileObject fo = (CustomFileObject)manager.resolveFile("sch:/");
> >
> > CustomFileName fn = new CustomFileName("sch",
> "userName",FileType.FOLDER);
> >
> > CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
> > fs.attach(fo);
> > System.out.println(fo.isAttached()); // return false
> > fo.doAttach();
> > System.out.println(fo.isAttached()); // return false
> >
> >
> > My second problème is that I don't know how to set my root file system.
> And
> > also fo.getParent() throw a null pointer exception.
> >
> > Someone can tell me how to do this:
> >
> > FS
> > |__FileObject1 ...
> > |
> > |__FileObject2 ...
> >
> > or give me a tutorial to understand VFS API.
> >
> > Thanks & Regards.
> >
> >
> > --
> > Bakary,
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
--
Bakary,
Re: [ understand VFS ]
Posted by James Carman <ja...@carmanconsulting.com>.
I wouldn't do any downcasting if you want it to be generic. Use the
FileObject API:
FileObject rootDir = manager.resolveFile("sch:/");
FileObject userFolder = rootDir.resolveFile(userName);
userFolder.createFolder();
FileObject userFile = userFolder.resolveFile("MyFile.txt");
userFile.createFile();
To get stuff into this "user file", you can use:
File localFile = ...;
FileObject localFileObject = manager.toFileObject(localFile);
FileUtil.copyContent(localFileObject,userFile);
On Tue, Sep 23, 2008 at 3:37 PM, Bakary Dialaya DJIBA <di...@gmail.com> wrote:
> Hi,
>
> Given a FileSystem *fs* (extends abstractFS) and a FileObject *fo *(extends
> AbstractFO), how can I attach the fo to the fs?
>
> It's a silly question. I am trying to create a provider that I'll add to
> the default manager (of VFS). The provider is added successfully but I
> cannot make a link between *fs* and *fo*.
>
> To do this I write the code below:
>
> DefaultFileSystemManager manager new DefaultFileSystemManager();
> MyProvider provider = new MyProvider();
> FileSystemOptions fileSystemOptions = new FileSystemOptions();
>
> manager.addProvider("sch", provider);
> manager.init();
>
> CustomFileObject fo = (CustomFileObject)manager.resolveFile("sch:/");
>
> CustomFileName fn = new CustomFileName("sch", "userName",FileType.FOLDER);
>
> CustomFileSystem fs = new CustomFileSystem(fn,fileSystemOptions);
> fs.attach(fo);
> System.out.println(fo.isAttached()); // return false
> fo.doAttach();
> System.out.println(fo.isAttached()); // return false
>
>
> My second problème is that I don't know how to set my root file system. And
> also fo.getParent() throw a null pointer exception.
>
> Someone can tell me how to do this:
>
> FS
> |__FileObject1 ...
> |
> |__FileObject2 ...
>
> or give me a tutorial to understand VFS API.
>
> Thanks & Regards.
>
>
> --
> Bakary,
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org