Package | Top Level |
Class | public final class Namespace |
Inheritance | Namespace Object |
Language Version: | ActionScript 3.0 |
Runtime Versions: | AIR 1.0, Flash Player 9, Flash Lite 4 |
- Namespaces of XML objects Namespaces associate a namespace prefix with a Uniform Resource Identifier (URI) that identifies the namespace. The prefix is a string used to reference the namespace within an XML object. If the prefix is undefined, when the XML is converted to a string, a prefix is automatically generated.
- Namespace to differentiate methods Namespaces can differentiate methods with the same name to perform different tasks. If two methods have the same name but separate namespaces, they can perform different tasks.
- Namespaces for access control Namespaces can be used to control access to a group of properties and methods in a class. If you place the properties and methods into a private namespace, they are inaccessible to any code that does not have access to that namespace. You can grant access to the group of properties and methods by passing the namespace to other classes, methods or functions.
This class shows two forms of the constructor method because each form accepts different parameters.
This class (along with the XML, XMLList, and QName classes) implements powerful XML-handling standards defined in ECMAScript for XML (E4X) specification (ECMA-357 edition 2).
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Related API Elements
Property | Defined By | ||
---|---|---|---|
constructor : Object
A reference to the class object or constructor function for a given object instance. | Object | ||
prefix : String
The prefix of the namespace. | Namespace | ||
uri : String
The Uniform Resource Identifier (URI) of the namespace. | Namespace |
Method | Defined By | ||
---|---|---|---|
Creates a Namespace object according to the values of the prefixValue and uriValue parameters. | Namespace | ||
Creates a Namespace object. | Namespace | ||
Indicates whether an object has a specified property defined. | Object | ||
Indicates whether an instance of the Object class is in the prototype chain of the object specified
as the parameter. | Object | ||
Indicates whether the specified property exists and is enumerable. | Object | ||
Sets the availability of a dynamic property for loop operations. | Object | ||
Returns the string representation of this object, formatted according to locale-specific conventions. | Object | ||
Equivalent to the Namespace.uri property. | Namespace | ||
Returns the URI value of the specified object. | Namespace |
prefix | property |
uri | property |
Namespace | () | Constructor |
public function Namespace(prefixValue:*, uriValue:*)
Language Version: | ActionScript 3.0 |
Runtime Versions: | AIR 1.0, Flash Player 9 |
Creates a Namespace object according to the values of the prefixValue
and uriValue
parameters.
This constructor requires both parameters.
The value of the prefixValue
parameter is assigned to the prefix
property as follows:
- If
undefined
is passed,prefix
is set toundefined
. - If the value is a valid XML name, as determined by the
isXMLName()
function, it is converted to a string and assigned to theprefix
property. - If the value is not a valid XML name, the
prefix
property is set toundefined
.
The value of the uriValue
parameter is assigned to the uri
property as follows:
- If a QName object is passed, the
uri
property is set to the value of the QName object'suri
property. - Otherwise, the
uriValue
parameter is converted to a string and assigned to theuri
property.
Note: This class shows two constructor method entries because each form accepts different parameters. The constructor behaves differently depending on the type and number of arguments passed, as detailed in each entry. ActionScript 3.0 does not support method or constructor overloading.
ParametersprefixValue:* — The prefix to use for the namespace.
| |
uriValue:* — The Uniform Resource Identifier (URI) of the namespace.
|
Namespace | () | Constructor |
public function Namespace(uriValue:*)
Language Version: | ActionScript 3.0 |
Runtime Versions: | AIR 1.0, Flash Player 9 |
Creates a Namespace object.
The values assigned to the uri
and prefix
properties
of the new Namespace object depend on the type of value passed for the uriValue
parameter:
- If no value is passed, the
prefix
anduri
properties are set to an empty string. - If the value is a Namespace object, a copy of the object is created.
- If the value is a QName object, the
uri
property is set to theuri
property of the QName object.
Note: This class shows two constructor entries because each form accepts different parameters. The constructor behaves differently depending on the type and number of parameters passed, as detailed in each entry. ActionScript 3.0 does not support method or constructor overloading.
ParametersuriValue:* — The Uniform Resource Identifier (URI) of the namespace.
|
toString | () | method |
valueOf | () | method |
- The example defines three Namespace objects, each with a unique URI that defines a namespace.
- The example defines an XML variable named
myXML
and assigns it to the return value ofgetRSS()
. ThegetRSS()
method defines an XML object that contains several namespaces and returns that XML object. - The example declares and evaluates an Array variable by calling the
parseRSS()
method withmyXML
passed to it. InparseRSS()
, the default XML namespace is defined asrss
and the example defines an XMLList variable by assigning the list ofitem
objects inmyXML
. An array is created and populated with various nodes withinmyXML.item
. The array is then returned. - The elements in the array are printed using a
for
loop and three calls totrace()
.
package { import flash.display.Sprite; public class NamespaceExample extends Sprite { private var rss:Namespace = new Namespace("http://purl.org/rss/1.0/"); private var rdf:Namespace = new Namespace("http://www.w3.org/1999/02/22-rdf-syntax-ns#"); private var dc:Namespace = new Namespace("http://purl.org/dc/elements/1.1/"); public function NamespaceExample() { var myXML:XML = getRSS(); var rssItems:Array = parseRSS(myXML); var len:uint = rssItems.length; for (var i:uint; i < len; i++) { trace(rssItems[i].title); trace(rssItems[i].creator); trace(rssItems[i].date); // Adobe Flash Developer Center // Adobe // 2005-08-08 // Flex Developer Center // Adobe // 2005-10-16 } } private function parseRSS(rssXML:XML):Array { default xml namespace = rss; var items:XMLList = rssXML.item; var arr:Array = new Array(); var len:uint = items.length(); for (var i:uint; i < len; i++) { arr.push({title:items[i].title, creator:items[i].dc::creator, date:items[i].dc::date}); } return arr; } private function getRSS():XML { var myXML:XML = <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" > <channel rdf:about="http://www.xml.com/cs/xml/query/q/19"> <title>Test RSS</title> <link>http://www.adobe.com/</link> <description>This is a test RSS document.</description> <language>en-us</language> <items> <rdf:Seq> <rdf:li rdf:resource="http://www.adobe.com/devnet/flash/"/> <rdf:li rdf:resource="http://www.adobe.com/devnet/flex/"/> </rdf:Seq> </items> </channel> <item rdf:about="http://www.adobe.com/devnet/flash/"> <title>Adobe Flash Developer Center</title> <link>http://www.adobe.com/devnet/flash/</link> <description>Welcome to the Flash Developer Center</description> <dc:creator>Adobe</dc:creator> <dc:date>2005-08-08</dc:date> </item> <item rdf:about="http://www.adobe.com/devnet/flex/"> <title>Flex Developer Center</title> <link>http://www.adobe.com/devnet/flex/</link> <description>Welcome to the Flex Developer Center</description> <dc:creator>Adobe</dc:creator> <dc:date>2005-10-16</dc:date> </item> </rdf:RDF>; return myXML; } } }
hello()
reside in separate namespaces; each returns a different string when called.
package { import flash.display.Sprite; public class Namespace_2_Example extends Sprite { public function Namespace_2_Example() { var vocab:MultilingualVocabulary = new MultilingualVocabulary(); trace(vocab.hello()); // hello var languages:Array = vocab.getLanguages(); for (var i:uint; i < languages.length; i++) { var ns:Namespace = languages[i]; if (ns != null) { trace(ns.toString() + ": " + vocab.ns::hello()); // hello // MultilingualVocabulary:Hawaiian: aloha // MultilingualVocabulary:French: bon jour } } } } } class MultilingualVocabulary { public namespace French; public namespace Hawaiian; private var languages:Array; public function MultilingualVocabulary() { languages = new Array(Hawaiian, French); } public function hello():String { return "hello"; } Hawaiian function hello():String { return "aloha"; } French function hello():String { return "bon jour"; } public function getLanguages():Array { return languages; } }
The example defines namespaces and colors that correspond to mouse
states for a rectangular button. Each time the button is drawn, the example applies
the appropriate color (out is red; over is yellow; down is white) by referencing the bgcolor
variable for the corresponding namespace (out
, over
, down
).
package { import flash.display.Sprite; public class Namespace_3_Example extends Sprite { public function Namespace_3_Example() { addChild(new StateButton("Press Me.")); } } } import flash.display.Sprite; import flash.text.TextField; import flash.events.Event; import flash.events.MouseEvent; class StateButton extends Sprite{ private namespace out; private namespace over; private namespace down; private var label:TextField; private var labelTxt:String; private var ns:Namespace; out var bgColor:Number = 0xFF0000; over var bgColor:Number = 0xFFFF00; down var bgColor:Number = 0xFFFFFF; public function StateButton(str:String) { buttonMode = true; labelTxt = str; ns = out; draw(); addLabel(); addListeners(); } private function addLabel():void { label = new TextField(); label.text = labelTxt; label.width = 50; label.height = 20; label.mouseEnabled = false; addChild(label); } private function addListeners():void { addEventListener(MouseEvent.MOUSE_UP, mouseOverHandler); addEventListener(MouseEvent.MOUSE_OUT, mouseOutHandler); addEventListener(MouseEvent.MOUSE_OVER, mouseOverHandler); addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler); } private function mouseOutHandler(e:Event):void { ns = out; draw(); } private function mouseOverHandler(e:Event):void { ns = over; draw(); } private function mouseDownHandler(e:Event):void { ns = down; draw(); } private function draw():void { this.graphics.clear(); this.graphics.beginFill(ns::bgColor); this.graphics.drawRect(0, 0, 60, 20); } }
Wed Nov 21 2018, 06:34 AM -08:00