how to create barcode in vb net 2012 Attaching Application-Specific Data to Nodes in Java

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Attaching Application-Specific Data to Nodes
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Developers often find it useful to be able to attach application-defined data to a document s nodes For example, some legacy applications may use an XML file to represent certain types of internal data that are computationally expensive to construct To avoid the performance hit, they can build the complex data structure once and then attach it to the corresponding node in the DOM document tree In addition, developers might choose to use this functionality as an alternative to subclassing the DOM interfaces in their particular implementation because it might just be easier to define a data structure and attach it to a node rather than write a new node subclass Levels 1 and 2 of the DOM did not provide an official way to do this, though certain DOM implementations did allow applications to take arbitrary data pointers
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The Document Object Model: Processing Structured Documents
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and store them within a specially provided slot on the Node interface, such as the Apache Xerces implementation The Xerces DOM implementation provides two Node interface methods for working with data objects attached to document nodes: setUserData() and getUserData(), which (for Xerces-C) have the following function definitions:
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// Xerces-J setUserData and getUserData interfaces public void setUserData(javalangObject data); public javalangObject getUserData(); // Xerces-C setUserData and getUserData interfaces void setUserData(void *p); void *getUserData(void);
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These methods allow a Xerces-based application to attach an arbitrary block of data to a given node in a document (see the Xerces section of 6) The Xerces implementation does have a few drawbacks, however First, when that node is cloned, the Xerces parser explicitly does not clone the data along with it, preferring instead to leave this as something the application should take care of Second, there can be only one data block attached to a node at any given time, so if an application wants to attach more than one piece of data to the node, it has to come up with its own management scheme to get and set the correct data blocks For example, in the Java version of Xerces, the application might choose to store a Vector object on the node and then use it to manage an array of other data objects DOM Level 3 seeks to remedy these shortcomings and officially add the setUserData() and getUserData() methods to the Node interface The new methods have the following proposed IDL definition:
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DOMUserData DOMUserData setUserData( in DOMString key, in DOMUserData data, in UserDataHandler handler ); getUserData( in DOMString key );
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The DOM solution differs from the Xerces-style solution in two important ways First, it allows more than one piece of user-defined data to be associated with a node by using a key-value approach Each piece of data is associated with a key, which is used to identify a particular piece of data When the data is stored in the node via the setUserData() method, the key is used as an indexing mechanism to locate it, much the same way that associative arrays work in JavaScript When the data needs to be retrieved, the key is supplied to the getUserData() method and the data object is returned Figure 11-1 illustrates how the data is stored within the node
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11: Future Directions for the DOM
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Figure 11-1
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Key-value method of storing data in a node
The second major difference is in the behavior of nodes that are cloned or imported into another document Whereas Xerces does not perform any special processing on nodes that are cloned, deleted, renamed, or imported, the DOM solution allows an application to supply a UserDataHandler that will be called when one of these operations is performed on a node The UserDataHandler has the following IDL definition:
interface UserDataHandler { const unsigned short NODE_CLONED const unsigned short NODE_IMPORTED const unsigned short NODE_DELETED const unsigned short NODE_RENAMED void handle( in in in in in = = = = 1; 2; 3; 4;
unsigned short operation, DOMString key, DOMObject data, Node src, Node dst);
The first four constants represent the four Node operations that a UserDataHandler can be informed about There is a single method, handle(), which is called when one of the operations is being performed on the node The first argument,
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