Streaming XML Parser: Stax Event Filter : Stream Parser « XML « Java Tutorial

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Java Tutorial » XML » Stream Parser 
28. 5. 6. Streaming XML Parser: Stax Event Filter
import java.io.*;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import javax.xml.stream.*;
import javax.xml.stream.events.*;
import java.util.Date;
import javax.xml.namespace.QName;


public class MyStreamFilter implements javax.xml.stream.StreamFilter {
    public static void main(String[] argsthrows Exception {
        String filename = "yourXML.xml";

        XMLInputFactory xmlif = null;

        xmlif = XMLInputFactory.newInstance();
        xmlif.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES,Boolean.TRUE);
        xmlif.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES,Boolean.FALSE);
        xmlif.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, Boolean.TRUE);
        xmlif.setProperty(XMLInputFactory.IS_COALESCING, Boolean.TRUE);

        System.out.println("FACTORY: " + xmlif);
        System.out.println("filename = " + filename);

        FileInputStream fis = new FileInputStream(filename);

        XMLStreamReader xmlr = xmlif.createFilteredReader(xmlif.createXMLStreamReader(fis),new MyStreamFilter());

        int eventType = xmlr.getEventType();
        printEventType(eventType);

        while (xmlr.hasNext()) {
                eventType = xmlr.next();
                printEventType(eventType);
                printName(xmlr, eventType);
                printText(xmlr);

                if (xmlr.isStartElement()) {
                    printAttributes(xmlr);
                }
                printPIData(xmlr);
        }
    }

    public static final String getEventTypeString(int eventType) {
        switch (eventType) {
        case XMLEvent.START_ELEMENT:
            return "START_ELEMENT";

        case XMLEvent.END_ELEMENT:
            return "END_ELEMENT";

        case XMLEvent.PROCESSING_INSTRUCTION:
            return "PROCESSING_INSTRUCTION";

        case XMLEvent.CHARACTERS:
            return "CHARACTERS";

        case XMLEvent.COMMENT:
            return "COMMENT";

        case XMLEvent.START_DOCUMENT:
            return "START_DOCUMENT";

        case XMLEvent.END_DOCUMENT:
            return "END_DOCUMENT";

        case XMLEvent.ENTITY_REFERENCE:
            return "ENTITY_REFERENCE";

        case XMLEvent.ATTRIBUTE:
            return "ATTRIBUTE";

        case XMLEvent.DTD:
            return "DTD";

        case XMLEvent.CDATA:
            return "CDATA";
        }

        return "UNKNOWN_EVENT_TYPE";
    }

    private static void printEventType(int eventType) {
        System.out.print("EVENT TYPE(" + eventType + "):");
        System.out.println(getEventTypeString(eventType));
    }

    private static void printName(
        XMLStreamReader xmlr,
        int eventType) {
        if (xmlr.hasName()) {
            System.out.println("HAS NAME: " + xmlr.getLocalName());
        else {
            System.out.println("HAS NO NAME");
        }
    }

    private static void printText(XMLStreamReader xmlr) {
        if (xmlr.hasText()) {
            System.out.println("HAS TEXT: " + xmlr.getText());
        else {
            System.out.println("HAS NO TEXT");
        }
    }

    private static void printPIData(XMLStreamReader xmlr) {
        if (xmlr.getEventType() == XMLEvent.PROCESSING_INSTRUCTION) {
            System.out.println(" PI target = " + xmlr.getPITarget());
            System.out.println(" PI Data = " + xmlr.getPIData());
        }
    }

    private static void printAttributes(XMLStreamReader xmlr) {
        if (xmlr.getAttributeCount() 0) {
            System.out.println("\nHAS ATTRIBUTES: ");

            int count = xmlr.getAttributeCount();

            for (int i = 0; i < count; i++) {
                QName name = xmlr.getAttributeName(i);
                String namespace = xmlr.getAttributeNamespace(i);
                String type = xmlr.getAttributeType(i);
                String prefix = xmlr.getAttributePrefix(i);
                String value = xmlr.getAttributeValue(i);

                System.out.println("ATTRIBUTE-PREFIX: " + prefix);
                System.out.println("ATTRIBUTE-NAMESP: " + namespace);
                System.out.println("ATTRIBUTE-NAME:   " + name.toString());
                System.out.println("ATTRIBUTE-VALUE:  " + value);
                System.out.println("ATTRIBUTE-TYPE:  " + type);
            }
        else {
            System.out.println("HAS NO ATTRIBUTES");
        }
    }
    public boolean accept(XMLStreamReader reader) {
        if (!reader.isStartElement() && !reader.isEndElement()) {
            return false;
        else {
            return true;
        }
    }
}
28. 5. Stream Parser
28. 5. 1. StAX is a technology similar to SAX.
28. 5. 2. XMLEventReader Demo
28. 5. 3. XMLStreamWriter Demo
28. 5. 4. Using XMLEventFactory to create xml document
28. 5. 5. Streaming XML Parser: Stax Event
28. 5. 6. Streaming XML Parser: Stax Event Filter
28. 5. 7. XMLEventReader and XMLEventWriter for Stax XML parser
28. 5. 8. Using XMLStreamWriter to create XML file
28. 5. 9. STAX cursor
28. 5. 10. Catch XMLStreamException
28. 5. 11. Get information as an XMLEvent object when using cursor approach
28. 5. 12. Stax XML iterator read
28. 5. 13. Stax XML cursor read
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