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## com.caucho.vfs
Class Path

    java.lang.Object
      |
      +--com.caucho.vfs.Path

Direct Known Subclasses:
  FilesystemPath, MailtoPath, NullPath, TcpPath

public abstract class Path
extends java.lang.Object

A virtual filesystem path, essentially represented by a URL. Its API resembles a combination of the JDK File object and the URL object.

Paths are, in general, given with the canonical file separator of forward slash, '/'. The filesystems will take care of any necessary translation.

Currently available filesystems:

file:/path/to/file
  Java file
http://host:port/path/name?query
  HTTP request
tcp://host:port
  Raw TCP connection
mailto:user@host?subject='foo'+cc='user2'
  Mail to a user.
log:/group/subgroup/item
  Logging based on the configuration file.
stdout:
  System.out
stderr:
  System.err
null:
  The equivalent of /dev/null

Field Summary
`protected com.caucho.vfs.SchemeMap` | `schemeMap`

Constructor Summary
`protected` | `Path(Path root)`

Method Summary
`void` | `bind(Path context)` Binds the context to the current path.
`boolean` | `canRead()` Tests if the file can be read.
`boolean` | `canWrite()` Tests if the file can be written.
`boolean` | `createNewFile()` Creates the file named by this Path and returns true if the file is new.
`Path` | `createRoot()` Creates a restricted root, like the Unix chroot call.
`Path` | `createTempFile(java.lang.String prefix, java.lang.String suffix)` Creates a unique temporary file as a child of this directory.
`boolean` | `equals(java.lang.Object o)`
`boolean` | `exists()` Tests if the file exists.
`java.lang.Object` | `getAttribute(java.lang.String name)` Gets an attribute of the object.
`java.util.Iterator` | `getAttributeNames()` Returns a iterator of all attribute names set for this object.
`java.lang.String` | `getContentType()` Returns the mime-type of the file.
`java.lang.String` | `getFullPath()` Returns the full path, including the restricted root.
`java.lang.String` | `getHost()` Returns the hostname
`long` | `getLastModified()` Returns the last modified time of the file.
`long` | `getLength()` Returns the length of the file in bytes.
`java.lang.String` | `getNativePath()` Returns the native representation of the path.
`Path` | `getParent()` Returns the parent path.
`abstract java.lang.String` | `getPath()` Returns the path.
`int` | `getPort()` Returns the port.
`java.lang.String` | `getQuery()` Returns the query string of the path.
`abstract java.lang.String` | `getScheme()` Returns the url scheme
`java.lang.String` | `getTail()` Returns the last segment of the path.
`java.lang.String` | `getURL()` Returns the full url for the given path.
`java.lang.String` | `getUserPath()` Returns the last string used as a lookup, if available.
`java.lang.Object` | `getValue()` Gets the object at the path.
`boolean` | `isDirectory()` Tests if the path refers to a directory.
`boolean` | `isFile()` Tests if the path refers to a file.
`boolean` | `isObject()` Tests if the path refers to an object.
`java.util.Iterator` | `iterator()` Returns a jdk1.2 Iterator for the contents of this directory.
`java.lang.String[]` | `list()`
`Path` | `lookup(java.lang.String name)` Looks up a new path based on the old path.
`Path` | `lookup(java.lang.String userPath, java.util.Map newAttributes)` Returns a new path relative to the current one.
`Path` | `lookupNative(java.lang.String name)` Looks up a path using the local filesystem conventions.
`Path` | `lookupNative(java.lang.String name, java.util.Map attributes)` Looks up a native path, adding attributes.
`boolean` | `mkdir()` Creates the directory named by this path.
`boolean` | `mkdirs()` Creates the directory named by this path and any parent directories.
`WriteStream` | `openAppend()` Opens a resin stream for appending.
`protected StreamImpl` | `openAppendImpl()`
`ReadStream` | `openRead()` Opens a resin ReadStream for reading.
`protected StreamImpl` | `openReadImpl()`
`ReadWritePair` | `openReadWrite()` Opens a resin ReadWritePair for reading and writing.
`protected StreamImpl` | `openReadWriteImpl()`
`WriteStream` | `openWrite()` Opens a resin WriteStream for writing.
`protected StreamImpl` | `openWriteImpl()`
`boolean` | `remove()` Removes the file or directory named by this path.
`void` | `removeAttribute(java.lang.String name)` Remove an attribute.
`boolean` | `renameTo(Path path)` Renames the file or directory to the name given by the path.
`boolean` | `renameTo(java.lang.String path)` Renames the file or directory to the name given by the path.
`protected java.lang.String` | `scanScheme(java.lang.String uri)` Returns the scheme portion of a uri.
`protected abstract Path` | `schemeWalk(java.lang.String userPath, java.util.Map newAttributes, java.lang.String newPath, int offset)` Path-specific lookup.
`void` | `setAttribute(java.lang.String name, java.lang.Object value)` Sets an attribute of the path.
`void` | `setLastModified(long time)`
`void` | `setUserPath(java.lang.String userPath)` Sets the user path.
`void` | `setValue(java.lang.Object obj)` Sets the object at the path.
`java.lang.String` | `toString()`
`void` | `unbind()` unbinds a link.
`void` | `writeToStream(java.io.OutputStream os)`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### schemeMap

    protected com.caucho.vfs.SchemeMap schemeMap

Constructor Detail

### Path

    protected Path(Path root)

Method Detail

### lookup

    public final Path lookup(java.lang.String name)

  Looks up a new path based on the old path.
  Parameters:
    `name` - relative url to the new path
  Returns:
    The new path.

### lookup

    public Path lookup(java.lang.String userPath,
                       java.util.Map newAttributes)

  Returns a new path relative to the current one.

  Path only handles scheme:xxx. Subclasses of Path will specialize the xxx.

  Parameters:
    `userPath` - relative or absolute path, essentially any url.
    `newAttributes` - attributes for the new path.
  Returns:
    the new path or null if the scheme doesn't exist

### lookupNative

    public final Path lookupNative(java.lang.String name)

  Looks up a path using the local filesystem conventions. e.g. on Windows, a name of 'd:\foo\bar\baz.html' will look up the baz.html on drive d.
  Parameters:
    `name` - relative url using local filesystem separators.

### lookupNative

    public Path lookupNative(java.lang.String name,
                             java.util.Map attributes)

  Looks up a native path, adding attributes.

### getParent

    public Path getParent()

  Returns the parent path.

### scanScheme

    protected java.lang.String scanScheme(java.lang.String uri)

  Returns the scheme portion of a uri. Since schemes are case-insensitive, normalize them to lower case.

### schemeWalk

    protected abstract Path schemeWalk(java.lang.String userPath,
                                       java.util.Map newAttributes,
                                       java.lang.String newPath,
                                       int offset)

  Path-specific lookup. Path implementations will override this.
  Parameters:
    `userPath` - the user's lookup() path.
    `newAttributes` - the attributes for the new path.
    `newPath` - the lookup() path
    `offset` - offset into newPath to start lookup.
  Returns:
    the found path

### getURL

    public java.lang.String getURL()

  Returns the full url for the given path.

### getScheme

    public abstract java.lang.String getScheme()

  Returns the url scheme

### getHost

    public java.lang.String getHost()

  Returns the hostname

### getPort

    public int getPort()

  Returns the port.

### getPath

    public abstract java.lang.String getPath()

  Returns the path. e.g. for HTTP, returns the part after the host and port.

### getTail

    public java.lang.String getTail()

  Returns the last segment of the path.

  e.g. for http://www.caucho.com/products/index.html, getTail() returns 'index.html'

### getQuery

    public java.lang.String getQuery()

  Returns the query string of the path.

### getNativePath

    public java.lang.String getNativePath()

  Returns the native representation of the path. On Windows, getNativePath() returns 'd:\\foo\bar.html', getPath() returns '/d:/foo/bar.html'

### getUserPath

    public java.lang.String getUserPath()

  Returns the last string used as a lookup, if available. This allows parsers to give intelligent error messages, with the user's path instead of the whole path. The following will print '../test.html': `

       Path path = Pwd.lookup("/some/dir").lookup("../test.html");
       System.out.println(path.getUserPath());

  `

### setUserPath

    public void setUserPath(java.lang.String userPath)

  Sets the user path. Useful for temporary files caching another URL.

### getFullPath

    public java.lang.String getFullPath()

  Returns the full path, including the restricted root.

  For the following, path.getPath() returns '/file.html', while path.getFullPath() returns '/chroot/file.html'. ``

       Path chroot = Pwd.lookup("/chroot").createRoot();
       Path path = chroot.lookup("/file.html");

### exists

    public boolean exists()

  Tests if the file exists.

### getContentType

    public java.lang.String getContentType()

  Returns the mime-type of the file.

  Mime-type ignorant filesystems return 'application/octet-stream'

### isDirectory

    public boolean isDirectory()

  Tests if the path refers to a directory.

### isFile

    public boolean isFile()

  Tests if the path refers to a file.

### isObject

    public boolean isObject()

  Tests if the path refers to an object.

### getLength

    public long getLength()

  Returns the length of the file in bytes.
  Returns:
    0 for non-files

### getLastModified

    public long getLastModified()

  Returns the last modified time of the file. According to the jdk, this may not correspond to the system time.
  Returns:
    0 for non-files.

### setLastModified

    public void setLastModified(long time)

### canRead

    public boolean canRead()

  Tests if the file can be read.

### canWrite

    public boolean canWrite()

  Tests if the file can be written.

### list

    public java.lang.String[] list()
                            throws java.io.IOException

  Returns:
    The contents of this directory or null if the path does not refer to a directory.

### iterator

    public java.util.Iterator iterator()
                                throws java.io.IOException

  Returns a jdk1.2 Iterator for the contents of this directory.

### mkdir

    public boolean mkdir()
                  throws java.io.IOException

  Creates the directory named by this path.
  Returns:
    true if successful.

### mkdirs

    public boolean mkdirs()
                   throws java.io.IOException

  Creates the directory named by this path and any parent directories.
  Returns:
    true if successful.

### remove

    public boolean remove()
                   throws java.io.IOException

  Removes the file or directory named by this path.
  Returns:
    true if successful.

### renameTo

    public boolean renameTo(Path path)
                     throws java.io.IOException

  Renames the file or directory to the name given by the path.
  Returns:
    true if successful

### renameTo

    public final boolean renameTo(java.lang.String path)
                           throws java.io.IOException

  Renames the file or directory to the name given by the path.
  Returns:
    true if successful

### createRoot

    public Path createRoot()

  Creates a restricted root, like the Unix chroot call. Restricted roots cannot access schemes, so file:/etc/passwd cannot be used.

  createRoot is useful for restricting JavaScript scripts without resorting to the dreadfully slow security manager.

### bind

    public void bind(Path context)

  Binds the context to the current path. Later lookups will return the new context instead of the current path. Essentially, this is a software symbolic link.

### unbind

    public void unbind()

  unbinds a link.

### getValue

    public java.lang.Object getValue()
                              throws java.lang.Exception

  Gets the object at the path. Normal filesystems will generally typically return null.

  A bean filesystem or a mime-type aware filesystem could deserialize the contents of the file.

### setValue

    public void setValue(java.lang.Object obj)
                  throws java.lang.Exception

  Sets the object at the path.

  Normal filesystems will generally do nothing. However, a bean filesystem or a mime-type aware filesystem could serialize the object and store it.

### getAttribute

    public java.lang.Object getAttribute(java.lang.String name)
                                  throws java.io.IOException

  Gets an attribute of the object.

### setAttribute

    public void setAttribute(java.lang.String name,
                             java.lang.Object value)
                      throws java.io.IOException

  Sets an attribute of the path.

### removeAttribute

    public void removeAttribute(java.lang.String name)
                         throws java.io.IOException

  Remove an attribute.

### getAttributeNames

    public java.util.Iterator getAttributeNames()
                                         throws java.io.IOException

  Returns a iterator of all attribute names set for this object.
  Returns:
    null if path has no attributes.

### openRead

    public final ReadStream openRead()
                              throws java.io.IOException

  Opens a resin ReadStream for reading.

### openWrite

    public final WriteStream openWrite()
                                throws java.io.IOException

  Opens a resin WriteStream for writing.

### openReadWrite

    public ReadWritePair openReadWrite()
                                throws java.io.IOException

  Opens a resin ReadWritePair for reading and writing.

  A chat channel, for example, would open its socket using this interface.

### openAppend

    public WriteStream openAppend()
                           throws java.io.IOException

  Opens a resin stream for appending.

### createNewFile

    public boolean createNewFile()
                          throws java.io.IOException

  Creates the file named by this Path and returns true if the file is new.

### createTempFile

    public Path createTempFile(java.lang.String prefix,
                               java.lang.String suffix)
                        throws java.io.IOException

  Creates a unique temporary file as a child of this directory.
  Parameters:
    `prefix` - filename prefix
    `suffix` - filename suffix, defaults to .tmp
  Returns:
    Path to the new file.

### writeToStream

    public void writeToStream(java.io.OutputStream os)
                       throws java.io.IOException

### equals

    public boolean equals(java.lang.Object o)

  Overrides:
    equals in class java.lang.Object

### toString

    public java.lang.String toString()

  Overrides:
    toString in class java.lang.Object

### openReadImpl

    protected StreamImpl openReadImpl()
                               throws java.io.IOException

### openWriteImpl

    protected StreamImpl openWriteImpl()
                                throws java.io.IOException

### openReadWriteImpl

    protected StreamImpl openReadWriteImpl()
                                    throws java.io.IOException

### openAppendImpl

    protected StreamImpl openAppendImpl()
                                 throws java.io.IOException

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