Java saxparser download

For ease of transition, this class continues to support the same name and interface as well as supporting new methods. Once an instance of this class is obtained, XML can be parsed from a variety of input sources. As the content is parsed by the underlying parser, methods of the given HandlerBase or the DefaultHandler are called. Returns the XMLReader that is encapsulated by the implementation of this class. Object clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait.

Protected constructor to prevent instantiation. Reset this SAXParser to its original configuration. Returns the SAX parser that is encapsulated by the implementation of this class. If no schema is being used, null is returned. If the incorrect command-line arguments are specified when the program is run, then the SAXLocalNameCount application's usage method is invoked, to print out the correct options onscreen. Further usage options will be examined later in this lesson, when validation is addressed.

This interface requires a number of methods that the SAX parser invokes in response to various parsing events. The major event-handling methods are: startDocument , endDocument , startElement , and endElement. The easiest way to implement this interface is to extend the DefaultHandler class, defined in the org.

That class provides do-nothing methods for all the ContentHandler events. The example program extends that class. You will learn more about those methods later in this lesson.

Each of these methods is required by the interface to throw a SAXException. An exception thrown here is sent back to the parser, which sends it on to the code that invoked the parser. When a start tag or end tag is encountered, the name of the tag is passed as a String to the startElement or the endElement method, as appropriate. When a start tag is encountered, any attributes it defines are also passed in an Attributes list. Characters found within the element are passed as an array of characters, along with the number of characters length and an offset into the array that points to the first character.

This code defines what the application does when the parser encounters the start and end points of the document being parsed. The ContentHandler interface's startDocument method creates a java. Hashtable instance, which in Element Events will be populated with the XML elements the parser finds in the document. When the parser reaches the end of the document, the endDocument method is invoked, to get the names and counts of the elements contained in the hash table, and print out a message onscreen to tell the user how many incidences of each element were found.

As mentioned in Document Events , the hash table created by the startDocument method needs to be populated with the various elements that the parser finds in the document. The following code processes the start-element event:. This code processes the element tags, including any attributes defined in the start tag, to obtain the namespace universal resource identifier URI , the local name and the qualified name of that element.

The startElement method then populates the hash map created by startDocument with the local names and the counts thereof, for each type of element. Note that when the startElement method is invoked, if namespace processing is not enabled, then the local name for elements and attributes could turn out to be an empty string.

The code handles that case by using the qualified name whenever the simple name is an empty string. Note - Character events are not demonstrated in the SAXLocalNameCount example, but a brief description is included in this section, for completeness.

Parsers are not required to return any particular number of characters at one time. A parser can return anything from a single character at a time up to several thousand and still be a standard-conforming implementation.

So if your application needs to process the characters it sees, it is wise to have the characters method accumulate the characters in a java. StringBuffer and operate on them only when you are sure that all of them have been found.

You finish parsing text when an element ends, so you normally perform your character processing at that point. But you might also want to process text when an element starts. What Java class does this? It seems DOM would be slower developer. Sign up or log in Sign up using Google. Sign up using Facebook.

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