javax.xml.stream.events.XMLEvent#END_ELEMENT源码实例Demo

/** return the next state on the input
 *
 * @return int
 */

public int next() throws IOException, XNIException {
    //since namespace context should still be valid when the parser is at the end element state therefore
    //we pop the context only when next() has been called after the end element state was encountered. - nb.

    if((fScannerLastState == XMLEvent.END_ELEMENT) && fBindNamespaces){
        fScannerLastState = -1;
        fNamespaceContext.popContext();
    }

    return fScannerLastState = super.next();
}
 

/** Returns the prefix for the namespace declared at the
 * index.  Returns null if this is the default namespace
 * declaration
 *
 * @param index the position of the namespace declaration
 * @return returns the namespace prefix
 * @throws IllegalStateException if this is not a START_ELEMENT, END_ELEMENT or NAMESPACE
 */
public String getNamespacePrefix(int index) {
    if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT || fEventType == XMLEvent.NAMESPACE){
        //namespaceContext is dynamic object.
        String prefix = fScanner.getNamespaceContext().getDeclaredPrefixAt(index) ;
        return prefix.equals("") ? null : prefix ;
    }
    else{
        throw new IllegalStateException("Current state " + getEventTypeString(fEventType)
         + " is not among the states " + getEventTypeString(XMLEvent.START_ELEMENT)
         + ", " + getEventTypeString(XMLEvent.END_ELEMENT) + ", "
                 + getEventTypeString(XMLEvent.NAMESPACE)
         + " valid for getNamespacePrefix()." );
    }
}
 

/** return the next state on the input
 *
 * @return int
 */

public int next() throws IOException, XNIException {
    //since namespace context should still be valid when the parser is at the end element state therefore
    //we pop the context only when next() has been called after the end element state was encountered. - nb.

    if((fScannerLastState == XMLEvent.END_ELEMENT) && fBindNamespaces){
        fScannerLastState = -1;
        fNamespaceContext.popContext();
    }

    return fScannerLastState = super.next();
}
 

public static TsoDisconnectedGenerator fromXml(String contingencyId, XMLStreamReader xmlsr) throws XMLStreamException {
    String text = null;
    Map<String, Float> disconnectedGenerators = new HashMap<>();
    String id = null;
    while (xmlsr.hasNext()) {
        int eventType = xmlsr.next();
        switch (eventType) {
            case XMLEvent.CHARACTERS:
                text = xmlsr.getText();
                break;

            case XMLEvent.START_ELEMENT:
                if (Objects.equals(ELEM_GENERATOR, xmlsr.getLocalName())) {
                    id = xmlsr.getAttributeValue(null, "id");
                }
                break;

            case XMLEvent.END_ELEMENT:
                switch (xmlsr.getLocalName()) {
                    case ELEM_GENERATOR:
                        if (id == null) {
                            throw new AssertionError();
                        }
                        float p = Float.parseFloat(text);
                        disconnectedGenerators.put(id, p);
                        id = null;
                        break;
                    case "index":
                        return new TsoDisconnectedGenerator(contingencyId, disconnectedGenerators);
                    default:
                        throw new AssertionError("Unexpected element: " + xmlsr.getLocalName());
                }
                break;

            default:
                break;
        }
    }
    throw new AssertionError("Should not happen");
}
 

/**
 * Returns the prefix for the namespace declared at the index. Returns null
 * if this is the default namespace declaration
 *
 * @param index the position of the namespace declaration
 * @return returns the namespace prefix
 * @throws IllegalStateException if this is not a START_ELEMENT, END_ELEMENT
 * or NAMESPACE
 */
public String getNamespacePrefix(int index) {
    if (fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT
            || fEventType == XMLEvent.NAMESPACE) {
        //namespaceContext is dynamic object.
        String prefix = fScanner.getNamespaceContext().getDeclaredPrefixAt(index);
        return prefix.equals("") ? null : prefix;
    } else {
        throw new IllegalStateException("Current state " + getEventTypeString(fEventType)
                + " is not among the states " + getEventTypeString(XMLEvent.START_ELEMENT)
                + ", " + getEventTypeString(XMLEvent.END_ELEMENT) + ", "
                + getEventTypeString(XMLEvent.NAMESPACE)
                + " valid for getNamespacePrefix().");
    }
}
 

final static 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";
        case XMLEvent.SPACE:
            return "SPACE";
    }
    return "UNKNOWN_EVENT_TYPE, " + String.valueOf(eventType);
}
 

public String getLocalName() {
    if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT){
        //xxx check whats the value of fCurrentElement
        return fScanner.getElementQName().localpart ;
    }
    else if(fEventType == XMLEvent.ENTITY_REFERENCE){
        return fScanner.getEntityName();
    }
    throw new IllegalStateException("Method getLocalName() cannot be called for " +
        getEventTypeString(fEventType) + " event.");
}
 

/**
 * @return
 */
public String getValue() {
    if(fEventType == XMLEvent.PROCESSING_INSTRUCTION){
        return fScanner.getPIData().toString();
    } else if(fEventType == XMLEvent.COMMENT){
        return fScanner.getComment();
    } else if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT){
        return fScanner.getElementQName().localpart ;
    } else if(fEventType == XMLEvent.CHARACTERS){
        return fScanner.getCharacterData().toString();
    }
    return null;
}
 

/** Returns the uri for the namespace declared at the
 * index.
 *
 * @param index the position of the namespace declaration
 * @return returns the namespace uri
 * @throws IllegalStateException if this is not a START_ELEMENT, END_ELEMENT or NAMESPACE
 */
public String getNamespaceURI(int index) {
    if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT || fEventType == XMLEvent.NAMESPACE){
        //namespaceContext is dynamic object.
        return fScanner.getNamespaceContext().getURI(fScanner.getNamespaceContext().getDeclaredPrefixAt(index));
    }
    else{
        throw new IllegalStateException("Current state " + getEventTypeString(fEventType)
         + " is not among the states " + getEventTypeString(XMLEvent.START_ELEMENT)
         + ", " + getEventTypeString(XMLEvent.END_ELEMENT) + ", "
                 + getEventTypeString(XMLEvent.NAMESPACE)
         + " valid for getNamespaceURI()." );
    }

}
 

/**
 * @return
 */
public String getNamespaceURI() {
    //doesn't take care of Attribute as separte event
    if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT){
        return fScanner.getElementQName().uri ;
    }
    return null ;
}
 

/**
* @return the prefix of the current event, or null if the event does
* not have a prefix. For START_ELEMENT and END_ELEMENT, return
* XMLConstants.DEFAULT_NS_PREFIX when no prefix is available.
*/
public String getPrefix() {
    if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT){
        String prefix = fScanner.getElementQName().prefix;
        return prefix == null ? XMLConstants.DEFAULT_NS_PREFIX : prefix;
    }
    return null ;
}
 

/**
 * @return
 */
public String getValue() {
    if(fEventType == XMLEvent.PROCESSING_INSTRUCTION){
        return fScanner.getPIData().toString();
    } else if(fEventType == XMLEvent.COMMENT){
        return fScanner.getComment();
    } else if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT){
        return fScanner.getElementQName().localpart ;
    } else if(fEventType == XMLEvent.CHARACTERS){
        return fScanner.getCharacterData().toString();
    }
    return null;
}
 

/** return the next state on the input
 *
 * @return int
 */

public int next() throws IOException, XNIException {
    //since namespace context should still be valid when the parser is at the end element state therefore
    //we pop the context only when next() has been called after the end element state was encountered. - nb.

    if((fScannerLastState == XMLEvent.END_ELEMENT) && fBindNamespaces){
        fScannerLastState = -1;
        fNamespaceContext.popContext();
    }

    return fScannerLastState = super.next();
}
 

/**
 * @return
 */
public String getValue() {
    if(fEventType == XMLEvent.PROCESSING_INSTRUCTION){
        return fScanner.getPIData().toString();
    } else if(fEventType == XMLEvent.COMMENT){
        return fScanner.getComment();
    } else if(fEventType == XMLEvent.START_ELEMENT || fEventType == XMLEvent.END_ELEMENT){
        return fScanner.getElementQName().localpart ;
    } else if(fEventType == XMLEvent.CHARACTERS){
        return fScanner.getCharacterData().toString();
    }
    return null;
}
 

private boolean isTag(XMLEvent event) {
    int eventType = event.getEventType();
    return eventType==XMLEvent.START_ELEMENT || eventType==XMLEvent.END_ELEMENT;
}
 

/** Reads the content of a text-only element. Precondition:
 * the current event is START_ELEMENT. Postcondition:
 * The current event is the corresponding END_ELEMENT.
 * @throws XMLStreamException if the current event is not a START_ELEMENT
 * or if a non text element is encountered
 */
public String getElementText() throws XMLStreamException {
    //we have to keep reference to the 'last event' of the stream to be able
    //to make this check - is there another way ? - nb.
    if(fLastEvent.getEventType() != XMLEvent.START_ELEMENT){
        throw new XMLStreamException(
        "parser must be on START_ELEMENT to read next text", fLastEvent.getLocation());
    }

    // STag content ETag
    //[43]   content   ::=   CharData? ((element | Reference | CDSect | PI | Comment) CharData?)*

    //<foo>....some long text say in KB and underlying parser reports multiple character
    // but getElementText() events....</foo>

    String data = null;
    //having a peeked event makes things really worse -- we have to test the first event
    if(fPeekedEvent != null){
        XMLEvent event = fPeekedEvent ;
        fPeekedEvent = null;
        int type = event.getEventType();

        if(  type == XMLEvent.CHARACTERS || type == XMLEvent.SPACE ||
        type == XMLEvent.CDATA){
            data = event.asCharacters().getData();
        }
        else if(type == XMLEvent.ENTITY_REFERENCE){
            data = ((EntityReference)event).getDeclaration().getReplacementText();
        }
        else if(type == XMLEvent.COMMENT || type == XMLEvent.PROCESSING_INSTRUCTION){
            //ignore
        } else if(type == XMLEvent.START_ELEMENT) {
            throw new XMLStreamException(
            "elementGetText() function expects text only elment but START_ELEMENT was encountered.", event.getLocation());
        }else if(type == XMLEvent.END_ELEMENT){
            return "";
        }

        //create the string buffer and add initial data
        StringBuffer buffer = new StringBuffer();
        if(data != null && data.length() > 0 ) {
            buffer.append(data);
        }
        //get the next event -- we should stop at END_ELEMENT but it can be any thing
        //things are worse when implementing this function in XMLEventReader because
        //there isn't any function called getText() which can get values for
        //space, cdata, characters and entity reference
        //nextEvent() would also set the last event.
        event = nextEvent();
        while(event.getEventType() != XMLEvent.END_ELEMENT){
            if(  type == XMLEvent.CHARACTERS || type == XMLEvent.SPACE ||
            type == XMLEvent.CDATA){
                data = event.asCharacters().getData();
            }
            else if(type == XMLEvent.ENTITY_REFERENCE){
                data = ((EntityReference)event).getDeclaration().getReplacementText();
            }
            else if(type == XMLEvent.COMMENT || type == XMLEvent.PROCESSING_INSTRUCTION){
                //ignore
            } else if(type == XMLEvent.END_DOCUMENT) {
                throw new XMLStreamException("unexpected end of document when reading element text content");
            } else if(type == XMLEvent.START_ELEMENT) {
                throw new XMLStreamException(
                "elementGetText() function expects text only elment but START_ELEMENT was encountered.", event.getLocation());
            } else {
                throw new XMLStreamException(
                "Unexpected event type "+ type, event.getLocation());
            }
            //add the data to the buffer
            if(data != null && data.length() > 0 ) {
                buffer.append(data);
            }
            event = nextEvent();
        }
        return buffer.toString();
    }//if (fPeekedEvent != null)

    //if there was no peeked, delegate everything to fXMLReader
    //update the last event before returning the text
    data = fXMLReader.getElementText();
    fLastEvent = fXMLEventAllocator.allocate(fXMLReader);
    return data;
}
 

public boolean isEndElement() {
    return fEventType == XMLEvent.END_ELEMENT;
}
 

/**
 * @return
 */
public boolean isEndElement() {
    return fEventType == XMLEvent.END_ELEMENT;
}
 

/**
 * @return
 */
public boolean isEndElement() {
    return fEventType == XMLEvent.END_ELEMENT;
}
 

XMLEvent getXMLEvent(XMLStreamReader reader){
    XMLEvent event = null;
    //returns the current event
    int eventType = reader.getEventType();
    //this needs to be set before creating events
    factory.setLocation(reader.getLocation());
    switch(eventType){

        case XMLEvent.START_ELEMENT:
        {
            StartElementEvent startElement = (StartElementEvent)factory.createStartElement(reader.getPrefix(),
                                reader.getNamespaceURI(), reader.getLocalName());

            addAttributes(startElement,reader);
            addNamespaces(startElement, reader);
            //need to fix it along with the Reader
            //setNamespaceContext(startElement,reader);
            event = startElement;
            break;
        }
        case XMLEvent.END_ELEMENT:
        {
            EndElementEvent endElement = (EndElementEvent)factory.createEndElement(
                    reader.getPrefix(), reader.getNamespaceURI(), reader.getLocalName());
            addNamespaces(endElement,reader);
            event = endElement ;
            break;
        }
        case XMLEvent.PROCESSING_INSTRUCTION:
        {
            event = factory.createProcessingInstruction(reader.getPITarget(),reader.getPIData());
            break;
        }
        case XMLEvent.CHARACTERS:
        {
            if (reader.isWhiteSpace())
              event = factory.createSpace(reader.getText());
            else
              event = factory.createCharacters(reader.getText());

            break;
        }
        case XMLEvent.COMMENT:
        {
            event = factory.createComment(reader.getText());
            break;
        }
        case XMLEvent.START_DOCUMENT:
        {
            StartDocumentEvent docEvent = (StartDocumentEvent)factory.createStartDocument(
                    reader.getVersion(), reader.getEncoding(), reader.isStandalone());
            if(reader.getCharacterEncodingScheme() != null){
                docEvent.setDeclaredEncoding(true);
            }else{
                docEvent.setDeclaredEncoding(false);
            }
            event = docEvent ;
            break;
        }
        case XMLEvent.END_DOCUMENT:{
            EndDocumentEvent endDocumentEvent = new EndDocumentEvent() ;
            event = endDocumentEvent ;
            break;
        }
        case XMLEvent.ENTITY_REFERENCE:{
            event = factory.createEntityReference(reader.getLocalName(),
                    new EntityDeclarationImpl(reader.getLocalName(),reader.getText()));
            break;

        }
        case XMLEvent.ATTRIBUTE:{
            event = null ;
            break;
        }
        case XMLEvent.DTD:{
            event = factory.createDTD(reader.getText());
            break;
        }
        case XMLEvent.CDATA:{
            event = factory.createCData(reader.getText());
            break;
        }
        case XMLEvent.SPACE:{
            event = factory.createSpace(reader.getText());
            break;
        }
    }
    return event ;
}