ContentHandler
public
abstract
class
ContentHandler
extends Object
The abstract class ContentHandler
is the superclass
of all classes that read an Object
from a
URLConnection
.
An application does not generally call the
getContent
method in this class directly. Instead, an
application calls the getContent
method in class
URL
or in URLConnection
.
The application's content handler factory (an instance of a class that
implements the interface ContentHandlerFactory
set
up by a call to setContentHandler
) is
called with a String
giving the MIME type of the
object being received on the socket. The factory returns an
instance of a subclass of ContentHandler
, and its
getContent
method is called to create the object.
If no content handler could be found, URLConnection will
look for a content handler in a user-defineable set of places.
By default it looks in sun.net.www.content, but users can define a
vertical-bar delimited set of class prefixes to search through in
addition by defining the java.content.handler.pkgs property.
The class name must be of the form:
{package-prefix}.{major}.{minor}
e.g.
YoyoDyne.experimental.text.plain
If the loading of the content handler class would be performed by
a classloader that is outside of the delegation chain of the caller,
the JVM will need the RuntimePermission "getClassLoader".
Summary
Public methods |
abstract
Object
|
getContent(URLConnection urlc)
Given a URL connect stream positioned at the beginning of the
representation of an object, this method reads that stream and
creates an object from it.
|
Object
|
getContent(URLConnection urlc, Class[] classes)
Given a URL connect stream positioned at the beginning of the
representation of an object, this method reads that stream and
creates an object that matches one of the types specified.
|
Inherited methods |
From
class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
|
boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
void
|
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
final
Class<?>
|
getClass()
Returns the runtime class of this Object .
|
int
|
hashCode()
Returns a hash code value for the object.
|
final
void
|
notify()
Wakes up a single thread that is waiting on this object's
monitor.
|
final
void
|
notifyAll()
Wakes up all threads that are waiting on this object's monitor.
|
String
|
toString()
Returns a string representation of the object.
|
final
void
|
wait(long millis, int nanos)
Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object, or
some other thread interrupts the current thread, or a certain
amount of real time has elapsed.
|
final
void
|
wait(long millis)
Causes the current thread to wait until either another thread invokes the
notify() method or the
notifyAll() method for this object, or a
specified amount of time has elapsed.
|
final
void
|
wait()
Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object.
|
|
Public constructors
ContentHandler
ContentHandler ()
Public methods
getContent
Object getContent (URLConnection urlc)
Given a URL connect stream positioned at the beginning of the
representation of an object, this method reads that stream and
creates an object from it.
Parameters |
urlc |
URLConnection :
a URL connection. |
Returns |
Object |
the object read by the ContentHandler . |
Throws |
IOException |
if an I/O error occurs while reading the object.
|
getContent
Object getContent (URLConnection urlc,
Class[] classes)
Given a URL connect stream positioned at the beginning of the
representation of an object, this method reads that stream and
creates an object that matches one of the types specified.
The default implementation of this method should call getContent()
and screen the return type for a match of the suggested types.
Parameters |
urlc |
URLConnection :
a URL connection. |
classes |
Class :
an array of types requested |
Returns |
Object |
the object read by the ContentHandler that is
the first match of the suggested types.
null if none of the requested are supported. |
Throws |
IOException |
if an I/O error occurs while reading the object. |