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Class net.www.html.URL

java.lang.Object
   |
   +----net.www.html.URL

public class URL

extends Object

content_aiff

content_anymap

content_basic

content_bcpio

content_bitmap

content_cpio

content_dvi

content_gif

content_graymap

content_gtar

content_hdf

content_html

content_ief

content_jpeg

content_latex

content_man

content_me

content_movie

content_mpeg

content_ms

content_msvideo

content_netcdf

content_octet

content_oda

content_pdf

content_pixmap

content_plain

content_postscript

content_quicktime

content_rast

content_rfc822

content_rgb

content_richtext

content_setext

content_shar

content_source

content_sv4cpio

content_sv4crc

content_tar

content_tex

content_texinfo

content_tiff

content_troff

content_type

Format of media, only valid after the stream has been opened

content_unknown

content_ustar

content_values

content_wav

content_xbitmap

content_xpixmap

content_xwindowdump

content_zip

file

"File name" on that host

fromUrl

only relevant if we're a post url

host

Host name to which to connect

port

Protocol port to connect to

postData

only relevant if we're a post url

protocol

What protocol to use (ftp, http, nntp, ...

ref

# reference

URL(String, String, String)

Create an absolute URL from the specified protocol, host, and file.

URL(URL, String, URL)

Create a POST URL

URL(URL, String)

Create a URL from the unparsed url in the context of the specified context.

URL(String)

Create a URL from the unparsed absolute URL

New(String)

Create an instance of a named class using a classloader that references this URL.

canCache()

Returns true if the data associated with this URL can be cached.

classInit()

The static initializer for this class must be completed before the static initializer for URLStreamHandler.

copyURL(URL)

Copy another URL's "vital statistics" into us.

equals(Object)

Compare two URLs.

flushClassLoader()

Flush the classloader cache.

getContent()

Get the object referred to by this URL.

getContent(InputStream, Observer)

Get the object referred to by this URL.

getPort()

hashCode()

Create an integer suitable for hash table indexing

isPostURL()

main(String[])

A simple main program for testing: fetches the object referenced by this URL and prints it.

mimeToContent(String)

Given a mime content type String (e.g.

openStream()

Open an input stream to the object references by the URL.

openStreamInteractively()

Similar to openStream except that it allows the stream handler to interact with the user to resolve certain problems.

sameFile(URL)

Compare two URLs, excluding the "ref" field: sameFile is true if the true reference the same remote object, but not necessarily the same subpiece of that object.

setType(String)

Force the content type of this URL to a specific value.

toExternalForm()

Reverse the parsing of the URL.

toString()

Convert to a human-readable form.

  public static String content_unknown

  public static String content_octet

  public static String content_oda

  public static String content_pdf

  public static String content_postscript

  public static String content_richtext

  public static String content_bcpio

  public static String content_cpio

  public static String content_dvi

  public static String content_gtar

  public static String content_hdf

  public static String content_latex

  public static String content_netcdf

  public static String content_shar

  public static String content_sv4cpio

  public static String content_sv4crc

  public static String content_tar

  public static String content_tex

  public static String content_texinfo

  public static String content_troff

  public static String content_man

  public static String content_me

  public static String content_ms

  public static String content_ustar

  public static String content_source

  public static String content_zip

  public static String content_basic

  public static String content_aiff

  public static String content_wav

  public static String content_gif

  public static String content_ief

  public static String content_jpeg

  public static String content_tiff

  public static String content_rast

  public static String content_anymap

  public static String content_bitmap

  public static String content_graymap

  public static String content_pixmap

  public static String content_rgb

  public static String content_xbitmap

  public static String content_xpixmap

  public static String content_xwindowdump

  public static String content_rfc822

  public static String content_html

  public static String content_plain

  public static String content_values

  public static String content_setext

  public static String content_mpeg

  public static String content_quicktime

  public static String content_msvideo

  public static String content_movie

  public String postData

only relevant if we're a post url

  public URL fromUrl

only relevant if we're a post url

  public String protocol

What protocol to use (ftp, http, nntp, ... etc)

  public String host

Host name to which to connect

  public String file

"File name" on that host

  public String ref

# reference

  public int port

Protocol port to connect to

  public String content_type

Format of media, only valid after the stream has been opened

  public URL(String p,
             String h,
             String f)

Create an absolute URL from the specified protocol, host, and file.

URL

  public URL(URL url,
             String post,
             URL from)

Create a POST URL

URL

  public URL(URL context,
             String spec)

Create a URL from the unparsed url in the context of the specified context. If spec is an absolute URL, cool, otherwise, parse it in terms of the context. Context may be null (indicating no context).

URL

  public URL(String spec)

Create a URL from the unparsed absolute URL

  public static void classInit()

The static initializer for this class must be completed before the static initializer for URLStreamHandler. Therefore we create a static method here that is explcitly called by the static initializer of URLStreamHeandler, thus guarrenteeing the correct order of initialization.

isPostURL

  public boolean isPostURL()

  protected void copyURL(URL url)

Copy another URL's "vital statistics" into us.

Parameters:

url - The URL to copy.

equals

  public boolean equals(Object o)

Compare two URLs.

Parameters:

o - The URL to compare against.

Returns:

true iff they are equal, false otherwise.

Overrides:

equals in class Object

hashCode

  public int hashCode()

Create an integer suitable for hash table indexing

Overrides:

hashCode in class Object

sameFile

  public boolean sameFile(URL other)

Compare two URLs, excluding the "ref" field: sameFile is true if the true reference the same remote object, but not necessarily the same subpiece of that object.

Parameters:

other - The URL to compare against.

Returns:

true iff they are equal, false otherwise.

toString

  public String toString()

Convert to a human-readable form.

Returns:

The textual representation.

Overrides:

toString in class Object

toExternalForm

  public String toExternalForm()

Reverse the parsing of the URL.

Returns:

The textual representation of the fully qualified URL (ie. after the context and canonicalization have been applied).

getPort

  public int getPort()

  public InputStream openStream()

Open an input stream to the object references by the URL. Invokes the appropriate protocol handler. Failure is indicated by throwing an exception. The act of opening this stream determines, in a protocol specific way, the content type of the object associated with this URL.

Returns:

The opened input stream. A value of null indicates that while the open was successful, there is no useful data provided by this protocol, it's done for side-effect only (the usual example is the "mailto" protocol).

openStreamInteractively

  public InputStream openStreamInteractively()

Similar to openStream except that it allows the stream handler to interact with the user to resolve certain problems. For example, the http handler will prompt for a user name and password to handle authentication failures. In these cases, openStream would just toss an exception.

setType

  public void setType(String type)

Force the content type of this URL to a specific value.

Parameters:

type - The content type to use. One of the content_* static variables in this class should be used. eg. setType(URL.content_html);

mimeToContent

  public String mimeToContent(String type)

Given a mime content type String (e.g. image/x-gif) produce the internal URL type atom for that type.

canCache

  public boolean canCache()

Returns true if the data associated with this URL can be cached.

getContent

  public Object getContent()

Get the object referred to by this URL. For example, if it refers to an image the object will be some subclass if DIBitmap. The instanceof operator should be used to determine what kind of object was returned.

Returns:

the object that was fetched.

getContent

  public Object getContent(InputStream is,
                           Observer o)

Get the object referred to by this URL. For example, if it refers to an image the object will be some subclass if DIBitmap. The instanceof operator should be used to determine what kind of object was returned.

Parameters:

is - the stream to the Object. It must have been created by an earlier call to openStream.

Returns:

the object that was fetched. If there is no handler for the object, a stream is returned (logically the unmodified original stream, but it may have had another stream layered on top of it). Generally the caller should prompt to save the file locally if they get a stream back.

main

  public static void main(String args[])

A simple main program for testing: fetches the object referenced by this URL and prints it.

New

  public Object New(String clname)

Create an instance of a named class using a classloader that references this URL. It is similar to new(clname) except that it specifies a URL to search.

Parameters:

clname - The name of the class.

Returns:

The new instance of the class.

flushClassLoader

  public static synchronized void flushClassLoader()

Flush the classloader cache. This is only used when reloading a document which went we want to force the system to reload all the applets on that document. Flushing the cache is not the most efficient mechanism but it is the most expedient.

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