Package org.symphonyoss.symphony.messageml.elements

Class Element

java.lang.Object

org.symphonyoss.symphony.messageml.elements.Element

Direct Known Subclasses:

Bold, BulletList, Card, CardBody, CardHeader, Chime, Code, Div, Entity, ExpandableCard, ExpandableCardBody, ExpandableCardHeader, Form, FormElement, Header, HorizontalRule, Image, Italic, LineBreak, Link, ListItem, MessageML, OrderedList, Paragraph, Preformatted, Span, Table, TableBody, TableCell, TableFooter, TableHeader, TableHeaderCell, TableRow, TextNode

public abstract class Element
extends Object

Base class for MessageML elements. Contains methods for constructing MessageML document trees and their PresentationML and Markdown representation, overridden in subclasses if special treatment is required. By default all elements support the "class" and "style" attributes and translate to PresentationML as container elements including their children. To override this behaviour (e.g. to make the element empty), overload the respective methods in subclasses of this class. The intended use of this class is primarily internal. The main entry point are parse() methods in MessageMLContext.

Since:

3/27/17

Author:

lukasz

Field Summary

Fields

Modifier and Type	Field	Description
static String	CLASS_ATTR
protected FormatEnum	format
protected static String	ID_ATTR
static String	STYLE_ATTR

Method Summary

Modifier and Type	Method	Description
void	addChild(Element child)	Append a child to the element.
boolean	areNestedElementsAllowed()	Return true if nested elements are allowed By default true, override to false for elements that dont support nested elements
String	asText()	Return a text representation of the element, descending into its children.
void	buildAll(MessageMLParser parser, Element element)	Process a DOM element, descending into its children, and construct the output MessageML tree.
protected void	buildNode(MessageMLParser context, Node node)	Build a text node or a MessageML element based on the provided DOM node.
Integer	countNonTextNodesInNodeList(NodeList nodeList)
List<Element>	findElements(Class<?> type)	Search the MessageML tree (depth-first) for elements of a given type.
List<Element>	findElements(String tag)	Search the MessageML tree (depth-first) for elements with a given MessageML tag.
List<Element>	findElements(String attribute, String value)	Search the MessageML tree (depth-first) for elements with a given attribute-value pair.
String	getAttribute(String attr)	Return the value of the element's attribute "attr".
Map<String,String>	getAttributes()	Return a map of the element's attributes.
Element	getChild(int n)	Return the nth child of the element.
List<Element>	getChildren()	Return a list of the element's children.
FormatEnum	getFormat()	Return the format (MessageML or PresentationML) of the element.
String	getMessageMLTag()	Return the element's MessageML tag.
Element	getParent()	Return the parent of the element.
String	getPresentationMLTag()	Return the element's PresentationML tag.
String	getStringAttribute(Node attribute)	Get a DOM attribute as a String value.
boolean	hasExactNumberOfChildren(int childrenNumber)
Boolean	hasIdAttribute()	Informs if the element has an "id" attribute.
int	size()	Return the number of children of the element.
protected void	throwInvalidInputException(Node item)

Methods inherited from class java.lang.Object

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

Field Detail

CLASS_ATTR

public static final String CLASS_ATTR

See Also:

Constant Field Values

STYLE_ATTR

public static final String STYLE_ATTR

See Also:

Constant Field Values

ID_ATTR

protected static final String ID_ATTR

See Also:

Constant Field Values

format

protected FormatEnum format

Method Detail

hasIdAttribute

public Boolean hasIdAttribute()

Informs if the element has an "id" attribute. The parser that builds all elements keeps track of all ids from the elements that have it, in order to ensure unique values.

Returns:

buildAll

public void buildAll(MessageMLParser parser,
                     Element element)
              throws InvalidInputException,
                     ProcessingException

Process a DOM element, descending into its children, and construct the output MessageML tree.

Throws:

InvalidInputException

ProcessingException

buildNode

protected void buildNode(MessageMLParser context,
                         Node node)
                  throws InvalidInputException,
                         ProcessingException

Build a text node or a MessageML element based on the provided DOM node.

Throws:

InvalidInputException

ProcessingException

asText

public String asText()

Return a text representation of the element, descending into its children.

getStringAttribute

public String getStringAttribute(Node attribute)

Get a DOM attribute as a String value.

hasExactNumberOfChildren

public boolean hasExactNumberOfChildren(int childrenNumber)

getMessageMLTag

public final String getMessageMLTag()

Return the element's MessageML tag.

getPresentationMLTag

public String getPresentationMLTag()

Return the element's PresentationML tag. By default is equals to MessageML tag, override when needed

areNestedElementsAllowed

public boolean areNestedElementsAllowed()

Return true if nested elements are allowed By default true, override to false for elements that dont support nested elements

getAttributes

public Map<String,String> getAttributes()

Return a map of the element's attributes.

getAttribute

public String getAttribute(String attr)

Return the value of the element's attribute "attr".

getChildren

public List<Element> getChildren()

Return a list of the element's children.

getChild

public Element getChild(int n)

Return the nth child of the element.

addChild

public void addChild(Element child)

Append a child to the element.

size

public int size()

Return the number of children of the element.

getParent

public Element getParent()

Return the parent of the element.

getFormat

public FormatEnum getFormat()

Return the format (MessageML or PresentationML) of the element.

findElements

public List<Element> findElements(Class<?> type)

Search the MessageML tree (depth-first) for elements of a given type.

Parameters:

type - the class of elements to find

Returns:

found elements

findElements

public List<Element> findElements(String tag)

Search the MessageML tree (depth-first) for elements with a given MessageML tag.

Parameters:

tag - the MessageML tag of elements to find

Returns:

found elements

findElements

public List<Element> findElements(String attribute,
                                  String value)

Search the MessageML tree (depth-first) for elements with a given attribute-value pair.

Parameters:

attribute - the attribute name match

value - the attribute value to match

Returns:

found elements

countNonTextNodesInNodeList

public Integer countNonTextNodesInNodeList(NodeList nodeList)

throwInvalidInputException

protected void throwInvalidInputException(Node item)
                                   throws InvalidInputException

Throws:

InvalidInputException