javax.faces.context

Class ResponseWriter

java.lang.Object

java.io.Writer

javax.faces.context.ResponseWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

Direct Known Subclasses:

ResponseWriterWrapper

public abstract class ResponseWriter
extends Writer

ResponseWriter is an abstract class describing an adapter to an underlying output mechanism for character-based output. In addition to the low-level write() methods inherited from java.io.Writer, this class provides utility methods that are useful in producing elements and attributes for markup languages like HTML and XML.

Field Summary

Fields inherited from class java.io.Writer

lock

Constructor Summary

Constructors

Constructor and Description
ResponseWriter()

Method Summary

Modifier and Type	Method and Description
abstract ResponseWriter	cloneWithWriter(Writer writer) Create and return a new instance of this ResponseWriter, using the specified Writer as the output destination.
void	endCDATA() Close an XML CDATA block.
abstract void	endDocument() Write whatever text should end a response.
abstract void	endElement(String name) Write the end of an element, after closing any open element created by a call to startElement().
abstract void	flush() Flush any ouput buffered by the output method to the underlying Writer or OutputStream.
abstract String	getCharacterEncoding() Return the character encoding (such as "ISO-8859-1") for this ResponseWriter.
abstract String	getContentType() Return the content type (such as "text/html") for this ResponseWriter.
void	startCDATA() Open an XML CDATA block.
abstract void	startDocument() Write whatever text should begin a response.
abstract void	startElement(String name, UIComponent component) Write the start of an element, up to and including the element name.
abstract void	writeAttribute(String name, Object value, String property) Write an attribute name and corresponding value, after converting that text to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered.
abstract void	writeComment(Object comment) Write a comment containing the specified text, after converting that text to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered.
void	writeDoctype(String doctype) Write a string containing the markup specific doctype.
void	writePreamble(String preamble) Write a string containing the markup specific preamble.
abstract void	writeText(char[] text, int off, int len) Write text from a character array, after any performing any escaping appropriate for the markup language being rendered.
abstract void	writeText(Object text, String property) Write an object, after converting it to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered.
void	writeText(Object text, UIComponent component, String property) Write an object, after converting it to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered.
abstract void	writeURIAttribute(String name, Object value, String property) Write a URI attribute name and corresponding value, after converting that text to a String (if necessary), and after performing any encoding or escaping appropriate to the markup language being rendered.

Methods inherited from class java.io.Writer

append, append, append, close, write, write, write, write, write

Methods inherited from class java.lang.Object

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

Constructor Detail

ResponseWriter

public ResponseWriter()

Method Detail

getContentType

public abstract String getContentType()

Return the content type (such as "text/html") for this ResponseWriter. Note: this must not include the "charset=" suffix.

Returns:

the content type

getCharacterEncoding

public abstract String getCharacterEncoding()

Return the character encoding (such as "ISO-8859-1") for this ResponseWriter. Please see the IANA for a list of character encodings.

Returns:

the character encoding

flush

public abstract void flush()
                    throws IOException

Flush any ouput buffered by the output method to the underlying Writer or OutputStream. This method will not flush the underlying Writer or OutputStream; it simply clears any values buffered by this ResponseWriter.

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException

startDocument

public abstract void startDocument()
                            throws IOException

Write whatever text should begin a response.

Throws:

IOException - if an input/output error occurs

endDocument

public abstract void endDocument()
                          throws IOException

Write whatever text should end a response. If there is an open element that has been created by a call to startElement(), that element will be closed first.

Throws:

IOException - if an input/output error occurs

startElement

public abstract void startElement(String name,
                                  UIComponent component)
                           throws IOException

Write the start of an element, up to and including the element name. Once this method has been called, clients can call the writeAttribute() or writeURIAttribute() methods to add attributes and corresponding values. The starting element will be closed (that is, the trailing '>' character added) on any subsequent call to startElement(), writeComment(), writeText(), endElement(), endDocument(), close(), flush(), or write().

If the argument component's pass through attributes includes an attribute of the name given by the value of the symbolic constant Renderer.PASSTHROUGH_RENDERER_LOCALNAME_KEY, use that as the element name, instead of the value passed as the first parameter to this method. Care must be taken so that this value is not also rendered when any other pass through attributes on this component are rendered.

Parameters:

name - Name of the element to be started

component - The UIComponent (if any) to which this element corresponds. This component is inspected for its pass through attributes as described in the standard HTML_BASIC RenderKit specification.

Throws:

IOException - if an input/output error occurs

NullPointerException - if name is null

endElement

public abstract void endElement(String name)
                         throws IOException

Write the end of an element, after closing any open element created by a call to startElement(). Elements must be closed in the inverse order from which they were opened; it is an error to do otherwise.

If the argument component's pass through attributes includes an attribute of the name given by the value of the symbolic constant Renderer.PASSTHROUGH_RENDERER_LOCALNAME_KEY, use that as the element name, instead of the value passed as the first parameter to this method.

Parameters:

name - Name of the element to be ended

Throws:

IOException - if an input/output error occurs

NullPointerException - if name is null

writeAttribute

public abstract void writeAttribute(String name,
                                    Object value,
                                    String property)
                             throws IOException

Write an attribute name and corresponding value, after converting that text to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered. This method may only be called after a call to startElement(), and before the opened element has been closed.

Parameters:

name - Attribute name to be added

value - Attribute value to be added

property - Name of the property or attribute (if any) of the UIComponent associated with the containing element, to which this generated attribute corresponds

Throws:

IllegalStateException - if this method is called when there is no currently open element

IOException - if an input/output error occurs

NullPointerException - if name is null

writeURIAttribute

public abstract void writeURIAttribute(String name,
                                       Object value,
                                       String property)
                                throws IOException

Write a URI attribute name and corresponding value, after converting that text to a String (if necessary), and after performing any encoding or escaping appropriate to the markup language being rendered. When rendering in a WWW environment, the escaping conventions established in the W3C URI spec document <http://www.w3.org/Addressing/URL/uri-spec.html> must be followed. In particular, spaces ' ' must be encoded as %20 and not the plus character '+'. This method may only be called after a call to startElement(), and before the opened element has been closed.

Parameters:

name - Attribute name to be added

value - Attribute value to be added

property - Name of the property or attribute (if any) of the UIComponent associated with the containing element, to which this generated attribute corresponds

Throws:

IllegalStateException - if this method is called when there is no currently open element

IOException - if an input/output error occurs

NullPointerException - if name is null

startCDATA

public void startCDATA()
                throws IOException

Open an XML CDATA block. Note that XML does not allow nested CDATA blocks, though this method does not enforce that constraint. The default implementation of this method takes no action when invoked.

Throws:

IOException - if input/output error occures

endCDATA

public void endCDATA()
              throws IOException

Close an XML CDATA block. The default implementation of this method takes no action when invoked.

Throws:

IOException - if input/output error occures

writeComment

public abstract void writeComment(Object comment)
                           throws IOException

Write a comment containing the specified text, after converting that text to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered. If there is an open element that has been created by a call to startElement(), that element will be closed first.

Parameters:

comment - Text content of the comment

Throws:

IOException - if an input/output error occurs

NullPointerException - if comment is null

writePreamble

public void writePreamble(String preamble)
                   throws IOException

Write a string containing the markup specific preamble. No escaping is performed. The default implementation simply calls through to Writer.write(java.lang.String) .

The implementation makes no checks if this is the correct place in the response to have a preamble, nor does it prevent the preamble from being written more than once.

Parameters:

preamble - Text content of the preamble

Throws:

IOException - if an input/output error occurs

Since:

2.2

writeDoctype

public void writeDoctype(String doctype)
                  throws IOException

Write a string containing the markup specific doctype. No escaping is performed. The default implementation simply calls through to Writer.write(java.lang.String) .

The implementation makes no checks if this is the correct place in the response to have a doctype, nor does it prevent the doctype from being written more than once.

Parameters:

doctype - Text content of the doctype

Throws:

IOException - if an input/output error occurs

Since:

2.2

writeText

public abstract void writeText(Object text,
                               String property)
                        throws IOException

Write an object, after converting it to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered. If there is an open element that has been created by a call to startElement(), that element will be closed first.

Parameters:

text - Text to be written

property - Name of the property or attribute (if any) of the UIComponent associated with the containing element, to which this generated text corresponds

Throws:

IOException - if an input/output error occurs

NullPointerException - if text is null

writeText

public void writeText(Object text,
                      UIComponent component,
                      String property)
               throws IOException

Write an object, after converting it to a String (if necessary), and after performing any escaping appropriate for the markup language being rendered. This method is equivalent to writeText(java.lang.Object,java.lang.String) but adds a component property to allow custom ResponseWriter implementations to associate a component with an arbitrary portion of text.

The default implementation simply ignores the component argument and calls through to writeText(java.lang.Object,java.lang.String)

Parameters:

text - Text to be written

component - The UIComponent (if any) to which this element corresponds

property - Name of the property or attribute (if any) of the UIComponent associated with the containing element, to which this generated text corresponds

Throws:

IOException - if an input/output error occurs

NullPointerException - if text is null

Since:

1.2

writeText

public abstract void writeText(char[] text,
                               int off,
                               int len)
                        throws IOException

Write text from a character array, after any performing any escaping appropriate for the markup language being rendered. If there is an open element that has been created by a call to startElement(), that element will be closed first.

Parameters:

text - Text to be written

off - Starting offset (zero-relative)

len - Number of characters to be written

Throws:

IndexOutOfBoundsException - if the calculated starting or ending position is outside the bounds of the character array

IOException - if an input/output error occurs

NullPointerException - if text is null

cloneWithWriter

public abstract ResponseWriter cloneWithWriter(Writer writer)

Create and return a new instance of this ResponseWriter, using the specified Writer as the output destination.

Parameters:

writer - The Writer that is the output destination

Returns:

the new ResponseWriter