samples.sax.SAXParsingSample Maven / Gradle / Ivy
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* Unless required by applicable law or agreed to in writing, software
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package samples.sax;
import org.xml.sax.helpers.DefaultHandler;
import com.sun.xml.fastinfoset.sax.SAXDocumentParser;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/** Parses a FI document using SAXDocumentParser.
* The sample parses data/inv1a.finf as specified in the build.xml and handles SAX events
* to display corresponding content in XML format. The sample class entends DefaultHandler
* interface making itself a ContentHandler. Since the FastInfoset SAX package does not
* implement factory, a document parser is instantiated directly. The sample class implements
* some major event-handling methods as defined in the ContentHandler, such as startDocument,
* endDocument, startElement,
* endElement, and characters. In this sample, these methods simply write out the content
* to System.out.
*/
public class SAXParsingSample extends DefaultHandler {
static private Writer out;
StringBuffer textBuffer;
/** Starts the sample. The sample takes a FI document and parses it using SAXDocumentParser in
* the fastinfoset package
*
* @param argv FI document filename
*/
@SuppressWarnings("CallToThreadDumpStack")
public static void main(String argv[]) {
if (argv.length != 1) {
System.err.println("Usage: FastInfosetParser filename");
System.exit(1);
}
// instantiate event handler
DefaultHandler handler = new SAXParsingSample();
try {
// Set up output stream
out = new OutputStreamWriter(System.out, "UTF8");
// Create an inputstream
InputStream in = new BufferedInputStream(new FileInputStream(argv[0]));
// Instantiate a FI parser
SAXDocumentParser parser = new SAXDocumentParser();
parser.setContentHandler(handler);
// Start parsing
parser.parse(in);
} catch (Throwable t) {
t.printStackTrace();
}
System.exit(0);
}
/** Creates a new instance of FIParser */
public SAXParsingSample() {
}
//===========================================================
// SAX DocumentHandler methods
//===========================================================
/** Handles startDocument event and prints out file header.
*
*/
@Override
public void startDocument() throws SAXException {
display("");
displayNewLine();
}
/** Handles endDocument event
*
*/
@Override
public void endDocument() throws SAXException {
try {
displayNewLine();
out.flush();
} catch (IOException e) {
throw new SAXException("I/O error", e);
}
}
/** Handles startElement event. Prints out any text accumulated
* from the characters event before the element, the element name, and
* attributes if any.
*
* @param namespaceURI namespace URI
* @param localName The local name (without prefix), or the empty string if Namespace processing is not being performed.
* @param qName The qualified name (with prefix), or the empty string if qualified names are not available.
* @param attributes The specified or defaulted attributes.
*/
@Override
public void startElement(String namespaceURI, String localName,
String qName, Attributes attributes) throws SAXException {
// Print out text accumulated from the characters event
flushText();
String name;
if (localName.isEmpty()) {
name = qName;
} else {
name = localName;
}
// Print out element name and attributes if any
display("<" + name);
if (attributes != null) {
for (int i = 0; i < attributes.getLength(); i++) {
String aName = attributes.getLocalName(i);
if ("".equals(aName)) {
aName = attributes.getQName(i);
}
display(" " + aName + "=\"" + attributes.getValue(i) + "\"");
}
}
display(">");
}
/** Handles endElement event. Prints out any text accumulated
* from the characters event within the element, and then the end element name.
*
* @param namespaceURI namespace URI
* @param localName The local name (without prefix), or the empty string if Namespace processing is not being performed.
* @param qName The qualified name (with prefix), or the empty string if qualified names are not available.
*/
@Override
public void endElement(String namespaceURI, String localName, String qName )
throws SAXException {
// Print out text accumulated from the characters event
flushText();
String name = localName;
if ("".equals(name)) {
name = qName;
}
// Print out end element
display("");
}
/** Handles characters event. Save the text in a buffer for print-out in start/end element.
*
* @param ch The characters
* @param start The start position in the character array.
* @param length The number of characters to use from the character array.
*/
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
String s = new String(ch, start, length);
if (textBuffer == null) {
textBuffer = new StringBuffer(s);
} else {
textBuffer.append(s);
}
}
//===========================================================
// Utility Methods ...
//===========================================================
// Display text accumulated in the character buffer
private void flushText() throws SAXException {
if (textBuffer == null) {
return;
}
display(textBuffer.toString());
textBuffer = null;
}
// Wrap I/O exceptions in SAX exceptions, to
// suit handler signature requirements
private void display(String s) throws SAXException {
try {
out.write(s);
out.flush();
} catch (IOException e) {
throw new SAXException("I/O error", e);
}
}
// Displays a new line
private void displayNewLine() throws SAXException {
try {
out.write(System.getProperty("line.separator"));
} catch (IOException e) {
throw new SAXException("I/O error", e);
}
}
}
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