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

        synchronized (this.monitorMap)
        {
            FileName fn = file.getName();
            if (this.monitorMap.get(fn) != null)
            {
                FileObject parent;
                try
                {
                    parent = file.getParent();
                }
                catch (FileSystemException fse)
                {
                    parent = null;
                }


                this.monitorMap.remove(fn);


                if (parent != null)
                { // Not the root
                    FileMonitorAgent parentAgent =
                        (FileMonitorAgent) this.monitorMap.get(parent.getName());
                    if (parentAgent != null)
                    {
                        parentAgent.resetChildrenList();
                    }
                }

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    /**
     * Tests concurrent reads on different files works.
     */
    public void testConcurrentReadFiles() throws Exception
    {
        final FileObject file = getReadFolder().resolveFile("file1.txt");
        assertTrue(file.exists());
        final FileObject emptyFile = getReadFolder().resolveFile("empty.txt");
        assertTrue(emptyFile.exists());


        // Start reading from the file
        final InputStream instr = file.getContent().getInputStream();
        try
        {

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     * Tests that content and file objects are usable after being closed.
     */
    public void testReuse() throws Exception
    {
        // Get the test file
        FileObject file = getReadFolder().resolveFile("file1.txt");
        assertEquals(FileType.FILE, file.getType());


        // Get the file content
        assertSameContent(FILE1_CONTENT, file);


        // Read the content again
        assertSameContent(FILE1_CONTENT, file);


        // Close the content + file
        file.getContent().close();
        file.close();


        // Read the content again
        assertSameContent(FILE1_CONTENT, file);
    }

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     * Tests that input streams are cleaned up on file close.
     */
    public void testInstrCleanup() throws Exception
    {
        // Get the test file
        FileObject file = getReadFolder().resolveFile("file1.txt");
        assertEquals(FileType.FILE, file.getType());


        // Open some input streams
        final InputStream instr1 = file.getContent().getInputStream();
        assertTrue(instr1.read() == FILE1_CONTENT.charAt(0));
        final InputStream instr2 = file.getContent().getInputStream();
        assertTrue(instr2.read() == FILE1_CONTENT.charAt(0));


        // Close the file
        file.close();


        // Check
        assertTrue(instr1.read() == -1);
        assertTrue(instr2.read() == -1);
    }

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                        if (!missingChildren.empty())
                        {


                            while (!missingChildren.empty())
                            {
                                FileObject child = (FileObject)
                                    missingChildren.pop();
                                this.fireAllCreate(child);
                            }
                        }

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        // Locate the default manager
        final FileSystemManager manager = VFS.getManager();


        // Lookup a test jar file
        final File jarFile = getTestResource("test.jar");
        FileObject file = manager.toFileObject(jarFile);
        assertNotNull(file);
        assertTrue(file.exists());
        assertSame(FileType.FILE, file.getType());


        // Expand it
        file = manager.createFileSystem(file);
        assertNotNull(file);
        assertTrue(file.exists());
        assertSame(FileType.FOLDER, file.getType());
    }

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    protected FileObject createFile(final FileName name)
        throws Exception
    {
        // Find the file that the name points to
        final FileName junctionPoint = getJunctionForFile(name);
        final FileObject file;
        if (junctionPoint != null)
        {
            // Resolve the real file
            final FileObject junctionFile = (FileObject) junctions.get(junctionPoint);
            final String relName = junctionPoint.getRelativeName(name);
            file = junctionFile.resolveFile(relName, NameScope.DESCENDENT_OR_SELF);
        }
        else
        {
            file = null;
        }

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        final List queueActual = new ArrayList();
        queueActual.add(folder);


        while (queueActual.size() > 0)
        {
            final FileObject file = (FileObject) queueActual.remove(0);
            final FileInfo info = (FileInfo) queueExpected.remove(0);


            // Check the type is correct
            assertSame(info.type, file.getType());


            if (info.type == FileType.FILE)
            {
                continue;
            }


            // Check children
            final FileObject[] children = file.getChildren();


            // Make sure all children were found
            assertNotNull(children);
            assertEquals("count children of \"" + file.getName() + "\"", info.children.size(), children.length);


            // Recursively check each child
            for (int i = 0; i < children.length; i++)
            {
                final FileObject child = children[i];
                final FileInfo childInfo = (FileInfo) info.children.get(child.getName().getBaseName());


                // Make sure the child is expected
                assertNotNull(childInfo);


                // Add to the queue of files to check

View Full Code Here

     * Tests type determination.
     */
    public void testType() throws Exception
    {
        // Test a file
        FileObject file = getReadFolder().resolveFile("file1.txt");
        assertSame(FileType.FILE, file.getType());


        // Test a folder
        file = getReadFolder().resolveFile("dir1");
        assertSame(FileType.FOLDER, file.getType());


        // Test an unknown file
        file = getReadFolder().resolveFile("unknown-child");
        assertSame(FileType.IMAGINARY, file.getType());
    }

View Full Code Here

    /**
     * Tests the contents of root of file system can be listed.
     */
    public void testRoot() throws FileSystemException
    {
        final FileObject file = getReadFolder().getFileSystem().getRoot();
        file.getChildren();
    }

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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