Class XMLDecoder

java.lang.Object
- java.beans.XMLDecoder

All Implemented Interfaces:: AutoCloseable

public class XMLDecoder
extends Object
implements AutoCloseable

The XMLDecoder class is used to read XML documents created using the XMLEncoder and is used just like the ObjectInputStream. For example, one can use the following fragment to read the first object defined in an XML document written by the XMLEncoder class:

XMLDecoder d = new XMLDecoder(
                          new BufferedInputStream(
                              new FileInputStream("Test.xml")));
       Object result = d.readObject();
       d.close();

For more information you might also want to check out Long Term Persistence of JavaBeans Components: XML Schema, an article in The Swing Connection.

Since:: 1.4
See Also:: XMLEncoder, ObjectInputStream

Constructor Summary

Constructors
Constructor	Description
`XMLDecoder(InputStream in)`	Creates a new input stream for reading archives created by the `XMLEncoder` class.
`XMLDecoder(InputStream in, Object owner)`	Creates a new input stream for reading archives created by the `XMLEncoder` class.
`XMLDecoder(InputStream in, Object owner, ExceptionListener exceptionListener)`	Creates a new input stream for reading archives created by the `XMLEncoder` class.
`XMLDecoder(InputStream in, Object owner, ExceptionListener exceptionListener, ClassLoader cl)`	Creates a new input stream for reading archives created by the `XMLEncoder` class.
`XMLDecoder(InputSource is)`	Creates a new decoder to parse XML archives created by the `XMLEncoder` class.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	This method closes the input stream associated with this stream.
`static DefaultHandler`	`createHandler(Object owner, ExceptionListener el, ClassLoader cl)`	Creates a new handler for SAX parser that can be used to parse embedded XML archives created by the `XMLEncoder` class.
`ExceptionListener`	`getExceptionListener()`	Gets the exception handler for this stream.
`Object`	`getOwner()`	Gets the owner of this decoder.
`Object`	`readObject()`	Reads the next object from the underlying input stream.
`void`	`setExceptionListener(ExceptionListener exceptionListener)`	Sets the exception handler for this stream to `exceptionListener`.
`void`	`setOwner(Object owner)`	Sets the owner of this decoder to `owner`.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XMLDecoder

public XMLDecoder(InputStream in)

Creates a new input stream for reading archives created by the XMLEncoder class.

Parameters:: in - The underlying stream.
See Also:: XMLEncoder(java.io.OutputStream)

XMLDecoder

public XMLDecoder(InputStream in,
                  Object owner)

Creates a new input stream for reading archives created by the XMLEncoder class.

Parameters:: in - The underlying stream.; owner - The owner of this stream.

XMLDecoder

public XMLDecoder(InputStream in,
                  Object owner,
                  ExceptionListener exceptionListener)

Creates a new input stream for reading archives created by the XMLEncoder class.

Parameters:: in - the underlying stream.; owner - the owner of this stream.; exceptionListener - the exception handler for the stream; if null the default exception listener will be used.

XMLDecoder

public XMLDecoder(InputStream in,
                  Object owner,
                  ExceptionListener exceptionListener,
                  ClassLoader cl)

Creates a new input stream for reading archives created by the XMLEncoder class.

Parameters:: in - the underlying stream. null may be passed without error, though the resulting XMLDecoder will be useless; owner - the owner of this stream. null is a legal value; exceptionListener - the exception handler for the stream, or null to use the default; cl - the class loader used for instantiating objects. null indicates that the default class loader should be used
Since:: 1.5

XMLDecoder

public XMLDecoder(InputSource is)

Creates a new decoder to parse XML archives created by the XMLEncoder class. If the input source is is null, no exception is thrown and no parsing is performed. This behavior is similar to behavior of other constructors that use InputStream as a parameter.

Parameters:: is - the input source to parse
Since:: 1.7

Method Detail

close

public void close()

This method closes the input stream associated with this stream.

Specified by:: close in interface AutoCloseable

setExceptionListener

public void setExceptionListener(ExceptionListener exceptionListener)

Sets the exception handler for this stream to exceptionListener. The exception handler is notified when this stream catches recoverable exceptions.

Parameters:: exceptionListener - The exception handler for this stream; if null the default exception listener will be used.
See Also:: getExceptionListener()

getExceptionListener

public ExceptionListener getExceptionListener()

Gets the exception handler for this stream.

Returns:: The exception handler for this stream. Will return the default exception listener if this has not explicitly been set.
See Also:: setExceptionListener(java.beans.ExceptionListener)

readObject

public Object readObject()

Reads the next object from the underlying input stream.

Returns:: the next object read
Throws:: ArrayIndexOutOfBoundsException - if the stream contains no objects (or no more objects)
See Also:: XMLEncoder.writeObject(java.lang.Object)

setOwner

public void setOwner(Object owner)

Sets the owner of this decoder to owner.

Parameters:: owner - The owner of this decoder.
See Also:: getOwner()

getOwner

public Object getOwner()

Gets the owner of this decoder.

Returns:: The owner of this decoder.
See Also:: setOwner(java.lang.Object)

createHandler

public static DefaultHandler createHandler(Object owner,
                                           ExceptionListener el,
                                           ClassLoader cl)

Creates a new handler for SAX parser that can be used to parse embedded XML archives created by the XMLEncoder class. The owner should be used if parsed XML document contains the method call within context of the <java> element. The null value may cause illegal parsing in such case. The same problem may occur, if the owner class does not contain expected method to call. See details here.

Parameters:: owner - the owner of the default handler that can be used as a value of <java> element; el - the exception handler for the parser, or null to use the default exception handler; cl - the class loader used for instantiating objects, or null to use the default class loader
Returns:: an instance of DefaultHandler for SAX parser
Since:: 1.7