Class ResponseWriter

  • Direct Known Subclasses:
    ResponseWriterWrapper


    public abstract class ResponseWriter
    extends java.io.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
      ResponseWriter​()  
    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      abstract ResponseWriter cloneWithWriter​(java.io.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​(java.lang.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 java.lang.String getCharacterEncoding​()
      Return the character encoding (such as "ISO-8859-1") for this ResponseWriter.
      abstract java.lang.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​(java.lang.String name, UIComponent component)
      Write the start of an element, up to and including the element name.
      abstract void writeAttribute​(java.lang.String name, java.lang.Object value, java.lang.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​(java.lang.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​(java.lang.String doctype)
      Write a string containing the markup specific doctype.
      void writePreamble​(java.lang.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​(java.lang.Object text, java.lang.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​(java.lang.Object text, UIComponent component, java.lang.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​(java.lang.String name, java.lang.Object value, java.lang.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.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
      • Methods inherited from class java.io.Writer

        append, append, append, close, write, write, write, write, write
    • Constructor Detail

      • ResponseWriter

        public ResponseWriter​()
    • Method Detail

      • getContentType

        public abstract java.lang.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 java.lang.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 java.io.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 class java.io.Writer
        Throws:
        java.io.IOException
      • startDocument

        public abstract void startDocument​()
                                    throws java.io.IOException

        Write whatever text should begin a response.

        Throws:
        java.io.IOException - if an input/output error occurs
      • endDocument

        public abstract void endDocument​()
                                  throws java.io.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:
        java.io.IOException - if an input/output error occurs
      • startElement

        public abstract void startElement​(java.lang.String name,
                                          UIComponent component)
                                   throws java.io.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:
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if name is null
      • endElement

        public abstract void endElement​(java.lang.String name)
                                 throws java.io.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:
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if name is null
      • writeAttribute

        public abstract void writeAttribute​(java.lang.String name,
                                            java.lang.Object value,
                                            java.lang.String property)
                                     throws java.io.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:
        java.lang.IllegalStateException - if this method is called when there is no currently open element
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if name is null
      • writeURIAttribute

        public abstract void writeURIAttribute​(java.lang.String name,
                                               java.lang.Object value,
                                               java.lang.String property)
                                        throws java.io.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:
        java.lang.IllegalStateException - if this method is called when there is no currently open element
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if name is null
      • startCDATA

        public void startCDATA​()
                        throws java.io.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:
        java.io.IOException - if input/output error occures
      • endCDATA

        public void endCDATA​()
                      throws java.io.IOException

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

        Throws:
        java.io.IOException - if input/output error occures
      • writeComment

        public abstract void writeComment​(java.lang.Object comment)
                                   throws java.io.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:
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if comment is null
      • writePreamble

        public void writePreamble​(java.lang.String preamble)
                           throws java.io.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:
        java.io.IOException - if an input/output error occurs
        Since:
        2.2
      • writeDoctype

        public void writeDoctype​(java.lang.String doctype)
                          throws java.io.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:
        java.io.IOException - if an input/output error occurs
        Since:
        2.2
      • writeText

        public abstract void writeText​(java.lang.Object text,
                                       java.lang.String property)
                                throws java.io.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:
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if text is null
      • writeText

        public void writeText​(java.lang.Object text,
                              UIComponent component,
                              java.lang.String property)
                       throws java.io.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:
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if text is null
        Since:
        1.2
      • writeText

        public abstract void writeText​(char[] text,
                                       int off,
                                       int len)
                                throws java.io.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:
        java.lang.IndexOutOfBoundsException - if the calculated starting or ending position is outside the bounds of the character array
        java.io.IOException - if an input/output error occurs
        java.lang.NullPointerException - if text is null
      • cloneWithWriter

        public abstract ResponseWriter cloneWithWriter​(java.io.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