Using Objects as Nested Data in Java

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Using Objects as Nested Data
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By inserting Objects inside Objects, you can create nested tree-like structures. By using dot notation, it is easy to traverse deeply nested trees of Objects.
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XML as Objects
In ActionScript 1.0 and ActionScript 2.0, it was not uncommon to convert XML structures into Object trees for convenience because traversing XML could be somewhat unwieldy. With E4X, however, traversing XML is just as easy. Also, E4X lets you handle structured data with much more elegance and sophistication than nested Objects. I recommend using XML for nested data. 11, XML and E4X, shows how to work with XML in depth.
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Part II: Core ActionScript 3.0 Data Types
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The syntax used to declare Object literals is simple and ef cient enough for most uses that it has been adopted by many web programmers as a lightweight alternative to XML. For example, consider the following JavaScript Object:
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var book = {"title": "ActionScript 3.0 Bible 2nd Ed.", "ISBN": "978-0-470-52523-4", "author": "Roger Braunstein", "chapters": [ {"title": "Objects and Dictionaries", "classes": ["Object", "Dictionary", "Array"] }, {"title": "XML and E4X", "classes": ["XML"] } ], "rating": "awesome" } book.chapters[0].title; //"Objects and Dictionaries" book.rating; //"awesome"
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The Object assigned to book is a deeply nested data structure using only Objects and Arrays. Dot and bracket notation can be used to traverse it. Surround that object with quotes instead and it becomes a string. JavaScript interpreters simply have to eval() the string to turn the string into the object it represents. That is, in a nutshell, JSON. Unfortunately, this trick doesn t work in ActionScript 3.0, because Flash Player does not compile or run ActionScript code at runtime, and eval() will throw an error if you ever call it. So E4X and lack of eval() interpretation are two good reasons to prefer XML for nested data. If you must use JSON, however, Adobe provides a JSON parser in the corelib library available at
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All classes extend Object.
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Object is an empty class that is dynamic.
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You can create and modify properties and methods of dynamic classes at runtime. Both Object and Dictionary implement associative arrays. Associative arrays store key-value pairs. In Objects, the keys must be strings. In
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Dictionarys, they can be any object.
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XML and E4X
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ctionScript 3.0 includes thorough, language-level support for XML. Not only can you create, load, and parse XML, you can write XML literals directly into ActionScript 3.0 code. A robust XML manipulation and query language, E4X, provides you with the tools to quickly and easily get the information you need. E4X, too, is implemented at the language level to make XML manipulation succinct.
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Getting Started with XML in ActionScript
XML the eXtensible Markup Language is a format for storing any kind of hierarchical data. It has universal adoption and countless uses. XML is designed to be minimal; as the name extensible implies, you can design your own language that uses XML for its general structure but adds on more speci c grammar.
XML References
This chapter assumes a basic knowledge of XML s structure and syntax. If you are unfamiliar with XML, you may want to check out the W3C Schools XML Tutorial (, the Wikipedia entry on XML (, or one of the many books available on XML. Let s agree on some terminology:
< xml version="1.0" encoding="UTF-8" > <parentNode> <childNode attributeName="Attribute Value"> Node Content </childNode>
Part II: Core ActionScript 3.0 Data Types
<childlessChildNode/> <!-- comment --> </parentNode>
The XML document begins with the document declaration and contains exactly one root node parentNode here. Data is represented by nodes, or elements parentNode and childNode enclosed within start and end tags. Nodes can contain other nodes like parentNode or they can be empty like childlessChildNode. Some elements contain attributes as name-value pairs within their start tags, which store additional information without nesting. Node names and attributes may be namespaced if the namespace is de ned in the root node (not shown). Some nodes may contain text nodes such as Node Content here that are plaintext. Sometimes these text nodes use character data, or CDATA, sections to avoid escaping XML control characters in the text. XML may also contain namespace declarations, comments, or processing instruction nodes. An element is a node with a start and end tag there are only three elements in this example whereas the term node is more general and applies to text nodes, comments, and processing instructions like the document declaration.