Package org.apache.tapestry5

Interface MarkupWriter

All Known Implementing Classes:

MarkupWriterImpl

public interface MarkupWriter

An interface used by objects, such as Tapestry components, that need to render themselves as some form of XML markup. A markup writer maintains the idea of a current element. Attributes are added to the current element, and new text and elements are placed inside the current element. In this way, the markup writer maintains a facade that XML markup is generated as a stream, even though the implementation builds a kind of DOM tree. The DOM tree can be also be manipulated. This solves a number of problems from Tapestry 4 (and earlier) where random access to the DOM was desired and had to be simulated through complex buffering.

Method Summary

Modifier and Type	Method	Description
void	addListener(MarkupWriterListener listener)	Adds a markup writer listener that will be notified as elements are started and ended.
Element	attributeNS(String namespace, String attributeName, String attributeValue)	Creates an attribute within the namespace for the current element.
void	attributes(Object... namesAndValues)	Adds a series of attributes and values.
void	cdata(String content)	Adds parsed character content.
void	comment(String text)	Adds an XML comment.
Element	defineNamespace(String namespace, String namespacePrefix)	Defines a namespace for the currently active element.
Element	element(String name, Object... attributes)	Begins a new element as a child of the current element.
Element	elementNS(String namespace, String elementName)	Starts an element within the given namespace.
Element	end()	Ends the current element.
Document	getDocument()	Returns the Document into which this writer creates elements or other nodes.
Element	getElement()	Returns the currently active element.
void	removeListener(MarkupWriterListener listener)	Removes a previously added listener.
void	toMarkup(PrintWriter writer)	Converts the collected markup into an markup stream (according to rules provided by the Document's MarkupModel).
void	write(String text)	Writes the text as a child of the current element.
void	writef(String format, Object... args)	Writes a formatted string.
void	writeRaw(String text)	Writes raw text, text with existing markup that should be passed through the client without change.

Method Detail

element

Element element(String name,
                Object... attributes)

Begins a new element as a child of the current element. The new element becomes the current element. The new Element is returned and can be directly manipulated (possibly at a later date). Optionally, attributes for the new element can be specified directly.

Parameters:

name - the name of the element to create

attributes - an even number of values, alternating names and values

Returns:

the new DOM Element node

See Also:

attributes(Object[])

end

Element end()

Ends the current element. The new current element will be the parent element. Returns the new current element (which may be null when ending the root element for the document).

write

void write(String text)

Writes the text as a child of the current element.

writef

void writef(String format,
            Object... args)

Writes a formatted string.

writeRaw

void writeRaw(String text)

Writes raw text, text with existing markup that should be passed through the client without change. This can be useful when the markup is read from an external source (a file or a database) and is simply to be included.

Parameters:

text -

See Also:

Raw

comment

void comment(String text)

Adds an XML comment. The text should be just the comment content, the comment delimiters will be provided. Note that, as of Tapestry 5.2., no extra whitespace is added (previous releases added a space around the text).

cdata

void cdata(String content)

Adds parsed character content. This will be enclosed in a CDATA block if supported. When not supported, this is the same as write(String).

Parameters:

content - pre-parsed content

attributes

void attributes(Object... namesAndValues)

Adds a series of attributes and values. Null values are quietly skipped. If a name already has a value, then the new value is ignored.

toMarkup

void toMarkup(PrintWriter writer)

Converts the collected markup into an markup stream (according to rules provided by the Document's MarkupModel). The markup stream is sent to the writer.

getDocument

Document getDocument()

Returns the Document into which this writer creates elements or other nodes.

getElement

Element getElement()

Returns the currently active element.

defineNamespace

Element defineNamespace(String namespace,
                        String namespacePrefix)

Defines a namespace for the currently active element. The namespace URI will be mapped to the provided namespace prefix within the Element.

Parameters:

namespace - the namespace URI

namespacePrefix - the prefix for elements and attributes associated with the namespace (may be the empty string for the default namespace)

Returns:

the currently active element

elementNS

Element elementNS(String namespace,
                  String elementName)

Starts an element within the given namespace. The correct namespace prefix will be identified and used. Must be balanced by a call to end().

Parameters:

namespace - URI containing the element

elementName - name of the element within the namespace

Returns:

the new Element

attributeNS

Element attributeNS(String namespace,
                    String attributeName,
                    String attributeValue)

Creates an attribute within the namespace for the current element.

Parameters:

namespace - URI containing the element

attributeName - name of the attribute within the namespace

attributeValue - the value for the attribute

Returns:

the currently active element

addListener

void addListener(MarkupWriterListener listener)

Adds a markup writer listener that will be notified as elements are started and ended.

removeListener

void removeListener(MarkupWriterListener listener)

Removes a previously added listener.