org.apache.shindig.gadgets.templates.tags
Class AbstractTagHandler

java.lang.Object
  org.apache.shindig.gadgets.templates.tags.AbstractTagHandler

All Implemented Interfaces:

TagHandler

Direct Known Subclasses:

FlashTagHandler, HtmlTagHandler, IfTagHandler, RenderTagHandler, RepeatTagHandler, TemplateBasedTagHandler, VariableTagHandler

public abstract class AbstractTagHandler
extends Object
implements TagHandler

Abstract implementation of TagHandler, provides convenience methods for resolving values in context.

Field Summary

Fields inherited from interface org.apache.shindig.gadgets.templates.tags.TagHandler

OPENSOCIAL_NAMESPACE

Constructor Summary

AbstractTagHandler(String namespaceUri, String tagName)
Create the tag handler instance.

Method Summary

protected void	appendTextNode(Node parent, String text) Create a text node with proper escaping.
String	getNamespaceUri()
String	getTagName()
protected <T> T	getValueFromTag(Element tag, String name, TemplateProcessor processor, Class<T> type) Returns the value of a tag attribute, evaluating any contained EL expressions if necessary.
protected DocumentFragment	processChildren(Element tag, TemplateProcessor processor)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.shindig.gadgets.templates.tags.TagHandler

process

Constructor Detail

AbstractTagHandler

public AbstractTagHandler(String namespaceUri,
                          String tagName)

Create the tag handler instance.

Parameters:

namespaceUri - the namespace of element this tag parses.

tagName - the local name of the element this tag parses.

Method Detail

getTagName

public String getTagName()

Specified by:

getTagName in interface TagHandler

Returns:

the local name of the element this tag parses.

getNamespaceUri

public String getNamespaceUri()

Specified by:

getNamespaceUri in interface TagHandler

Returns:

the namespace of the element this tag parses.

getValueFromTag

protected final <T> T getValueFromTag(Element tag,
                                      String name,
                                      TemplateProcessor processor,
                                      Class<T> type)

Returns the value of a tag attribute, evaluating any contained EL expressions if necessary.

Type Parameters:

T - the type of the value

Parameters:

tag - the element

name - the attribute name

processor - the template processor

type - the type of the value

Returns:

the value of the attribute, or null if the attribute is not present.

processChildren

protected final DocumentFragment processChildren(Element tag,
                                                 TemplateProcessor processor)

appendTextNode

protected final void appendTextNode(Node parent,
                                    String text)

Create a text node with proper escaping.