Examples of org.apache.commons.vfs.FileObject

org.apache.commons.vfs.FileObject
Represents a file, and is used to access the content and structure of the file.

Files are arranged in a hierarchy. Each hierachy forms a file system. A file system represents things like a local OS file system, a windows share, an HTTP server, or the contents of a Zip file.

There are two types of files: Folders, which contain other files, and normal files, which contain data, or content. A folder may not have any content, and a normal file cannot contain other files.

File Naming

TODO - write this.

Reading and Writing a File

Reading and writing a file, and all other operations on the file's content, is done using the {@link FileContent} object returnedby {@link #getContent}.

Creating and Deleting a File

A file is created using either {@link #createFolder}, {@link #createFile}, or by writing to the file using one of the {@link FileContent} methods.

A file is deleted using {@link #delete}. Recursive deletion can be done using {@link #delete(FileSelector)}.

Finding Files

Other files in the same file system as this file can be found using:
- {@link #resolveFile} to find another file relative to this file.
- {@link #getChildren} and {@link #getChild} to find the children of this file.
- {@link #getParent} to find the folder containing this file.
- {@link #getFileSystem} to find another file in the same file system.
To find files in another file system, use a {@link FileSystemManager}. @author Adam Murdoch @see FileSystemManager @see FileContent @see FileName

        throws FileSystemException
    {
        final FileObject[] children = dir.getChildren();
        for (int i = 0; i < children.length; i++)
        {
            final FileObject child = children[i];
            System.out.print(prefix);
            System.out.println(child.getName().getBaseName() + " [" + child.getURL().toExternalForm() + "]");
            if (recursive)
            {
              if (child.getType() == FileType.FOLDER) {
                System.out.println("/");


                listChildren(child, recursive, prefix + "    ");
              }
            }

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            try
            {
                FileSystemManager mgr = VFS.getManager();
                System.out.println();
                System.out.println("Parsing: " + args[i]);
                FileObject file = mgr.resolveFile(args[i]);
                System.out.println("URL: " + file.getURL());
                System.out.println("getName(): " + file.getName());
                System.out.println("BaseName: " + file.getName().getBaseName());
                System.out.println("Extension: " + file.getName().getExtension());
                System.out.println("Path: " + file.getName().getPath());
                System.out.println("Scheme: " + file.getName().getScheme());
                System.out.println("URI: " + file.getName().getURI());
                System.out.println("Root URI: " + file.getName().getRootURI());
                System.out.println("Parent: " + file.getName().getParent());
                System.out.println("Type: " + file.getType());
                System.out.println("Exists: " + file.exists());
                System.out.println("Readable: " + file.isReadable());
                System.out.println("Writeable: " + file.isWriteable());
                System.out.println("Root path: " + file.getFileSystem().getRoot().getName().getPath());
                if (file.exists())
                {
                    if (file.getType().equals(FileType.FILE))
                    {
                        System.out.println("Size: " + file.getContent().getSize() + " bytes");
                    }
                    else if (file.getType().equals(FileType.FOLDER) && file.isReadable())
                    {
                        FileObject[] children = file.getChildren();
                        System.out.println("Directory with " + children.length + " files");
                        for (int iterChildren = 0; iterChildren < children.length; iterChildren++)
                        {
                            System.out.println("#" + iterChildren + ": " + children[iterChildren].getName());
                            if (iterChildren > 5)
                            {
                                break;
                            }
                        }
                    }
                    System.out.println("Last modified: " + DateFormat.getInstance().format(new Date(file.getContent().getLastModifiedTime())));
                }
                else
                {
                    System.out.println("The file does not exist");
                }
                file.close();
            }
            catch (FileSystemException ex)
            {
                ex.printStackTrace();
            }

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            {
                return doIsWriteable();
            }
            else
            {
                final FileObject parent = getParent();
                if (parent != null)
                {
                    return parent.isWriteable();
                }
                return true;
            }
        }
        catch (final Exception exc)

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            {
                throw new FileSystemException("vfs.provider/create-folder-read-only.error", name);
            }


            // Traverse up the heirarchy and make sure everything is a folder
            final FileObject parent = getParent();
            if (parent != null)
            {
                parent.createFolder();
            }


            try
            {
                // Create the folder

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        // Copy everything across
        final int count = files.size();
        for (int i = 0; i < count; i++)
        {
            final FileObject srcFile = (FileObject) files.get(i);


            // Determine the destination file
            final String relPath = file.getName().getRelativeName(srcFile.getName());
            final FileObject destFile = resolveFile(relPath, NameScope.DESCENDENT_OR_SELF);


            // Clean up the destination file, if necessary
            if (destFile.exists() && destFile.getType() != srcFile.getType())
            {
                // The destination file exists, and is not of the same type,
                // so delete it
                // TODO - add a pluggable policy for deleting and overwriting existing files
                destFile.delete(Selectors.SELECT_ALL);
            }


            // Copy across
            try
            {
                if (srcFile.getType().hasContent())
                {
                    FileUtil.copyContent(srcFile, destFile);
                }
                else if (srcFile.getType().hasChildren())
                {
                    destFile.createFolder();
                }
            }
            catch (final IOException e)
            {
                throw new FileSystemException("vfs.provider/copy-file.error", new Object[]{srcFile, destFile}, e);

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        }


        if (getType() == FileType.IMAGINARY)
        {
// Does not exist - make sure parent does
            FileObject parent = getParent();
            if (parent != null)
            {
                parent.createFolder();
            }
        }


// Get the raw output stream
        try

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                                 final boolean depthwise,
                                 final List selected)
        throws Exception
    {
        // Check the file itself
        final FileObject file = fileInfo.getFile();
        final int index = selected.size();


        // If the file is a folder, traverse it
        if (file.getType().hasChildren() && selector.traverseDescendents(fileInfo))
        {
            final int curDepth = fileInfo.getDepth();
            fileInfo.setDepth(curDepth + 1);


            // Traverse the children
            final FileObject[] children = file.getChildren();
            for (int i = 0; i < children.length; i++)
            {
                final FileObject child = children[i];
                fileInfo.setFile(child);
                traverse(fileInfo, selector, depthwise, selected);
            }


            fileInfo.setFile(file);

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        if (url == null)
        {
            throw new FileSystemException("vfs.provider.url/badly-formed-uri.error", uri);
        }


        FileObject fo = getContext().getFileSystemManager().resolveFile(url.toExternalForm());
        return fo;
    }

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        {
            buf.insert(0, ":");
            buf.insert(0, schemes[iterSchemes]);
        }


        FileObject fo = getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
        return fo;
    }

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    }


    protected URLConnection openConnection(final URL url)
        throws IOException
    {
        final FileObject entry = context.resolveFile(url.toExternalForm(), fileSystemOptions);
        return new DefaultURLConnection(url, entry.getContent());
    }

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Examples of org.apache.commons.vfs.FileObject

File Naming

Reading and Writing a File

Creating and Deleting a File

Finding Files

Related Classes of org.apache.commons.vfs.FileObject