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
    Description
     
  • Method Summary

    Modifier and Type
    Method
    Description
    Create and return a new instance of this ResponseWriter, using the specified Writer as the output destination.
    void
    Close an XML CDATA block.
    abstract void
    Write whatever text should end a response.
    abstract void
    Write the end of an element, after closing any open element created by a call to startElement().
    abstract void
    Flush any ouput buffered by the output method to the underlying Writer or OutputStream.
    abstract String
    Return the character encoding (such as "ISO-8859-1") for this ResponseWriter.
    abstract String
    Return the content type (such as "text/html") for this ResponseWriter.
    void
    Open an XML CDATA block.
    abstract void
    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
    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
    Write a string containing the markup specific doctype.
    void
    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, nullWriter, write, write, write, write, write

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Constructor Details

    • ResponseWriter

      public ResponseWriter()
  • Method Details

    • 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