import static com.google.common.base.Preconditions.checkArgument;
+import java.io.BufferedInputStream;
+import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.Stack;
-
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Characters;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
-
import org.opendaylight.controller.sal.restconf.impl.CompositeNodeWrapper;
import org.opendaylight.controller.sal.restconf.impl.EmptyNodeWrapper;
import org.opendaylight.controller.sal.restconf.impl.IdentityValuesDTO;
private final static XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
private XMLEventReader eventReader;
- public CompositeNodeWrapper read(InputStream entityStream) throws XMLStreamException, UnsupportedFormatException {
+ public CompositeNodeWrapper read(InputStream entityStream) throws XMLStreamException,
+ UnsupportedFormatException,
+ IOException {
+ //Get an XML stream which can be marked, and reset, so we can check and see if there is
+ //any content being provided.
+ entityStream = getMarkableStream(entityStream);
+
+ if( isInputStreamEmpty( entityStream ) ) {
+ return null;
+ }
+
eventReader = xmlInputFactory.createXMLEventReader(entityStream);
if (eventReader.hasNext()) {
return root;
}
+ /**
+ * If the input stream is not markable, then it wraps the input stream with a buffered stream,
+ * which is mark able. That way we can check if the stream is empty safely.
+ * @param entityStream
+ * @return
+ */
+ private InputStream getMarkableStream(InputStream entityStream) {
+ if( !entityStream.markSupported() )
+ {
+ entityStream = new BufferedInputStream( entityStream );
+ }
+ return entityStream;
+ }
+
+ private boolean isInputStreamEmpty(InputStream entityStream)
+ throws IOException {
+ boolean isEmpty = false;
+ entityStream.mark( 1 );
+ if( entityStream.read() == -1 ){
+ isEmpty = true;
+ }
+ entityStream.reset();
+ return isEmpty;
+ }
+
private boolean isSimpleNodeEvent(final XMLEvent event) throws XMLStreamException {
checkArgument(event != null, "XML Event cannot be NULL!");
if (event.isStartElement()) {
- if (eventReader.hasNext()) {
- final XMLEvent innerEvent;
- innerEvent = eventReader.peek();
- if (innerEvent.isCharacters()) {
- final Characters chars = innerEvent.asCharacters();
- if (!chars.isWhiteSpace()) {
- return true;
- }
- } else if (innerEvent.isEndElement()) {
- return true;
- }
+ XMLEvent innerEvent = skipCommentsAndWhitespace();
+ if ( innerEvent != null && (innerEvent.isCharacters() || innerEvent.isEndElement())) {
+ return true;
}
}
return false;
private boolean isCompositeNodeEvent(final XMLEvent event) throws XMLStreamException {
checkArgument(event != null, "XML Event cannot be NULL!");
if (event.isStartElement()) {
- if (eventReader.hasNext()) {
- XMLEvent innerEvent;
- innerEvent = eventReader.peek();
- if (innerEvent.isCharacters()) {
- Characters chars = innerEvent.asCharacters();
- if (chars.isWhiteSpace()) {
- eventReader.nextEvent();
- innerEvent = eventReader.peek();
- }
- }
+ XMLEvent innerEvent = skipCommentsAndWhitespace();
+ if( innerEvent != null ) {
if (innerEvent.isStartElement()) {
return true;
}
return false;
}
+ private XMLEvent skipCommentsAndWhitespace() throws XMLStreamException {
+ while( eventReader.hasNext() ) {
+ XMLEvent event = eventReader.peek();
+ if( event.getEventType() == XMLStreamConstants.COMMENT ) {
+ eventReader.nextEvent();
+ continue;
+ }
+
+ if( event.isCharacters() ) {
+ Characters chars = event.asCharacters();
+ if( chars.isWhiteSpace() ) {
+ eventReader.nextEvent();
+ continue;
+ }
+ }
+ return event;
+ }
+ return null;
+ }
+
private CompositeNodeWrapper resolveCompositeNodeFromStartElement(final StartElement startElement) {
checkArgument(startElement != null, "Start Element cannot be NULL!");
return new CompositeNodeWrapper(getNamespaceFor(startElement), getLocalNameFor(startElement));
}
}
}
- return data;
+ return data == null ? null : data.trim();
}
private String getAdditionalData(XMLEvent event) throws XMLStreamException {
if (namespaceAndValue.length == 2) {
String namespace = startElement.getNamespaceContext().getNamespaceURI(namespaceAndValue[0]);
if (namespace != null && !namespace.isEmpty()) {
- return new IdentityValuesDTO(namespace, namespaceAndValue[1], namespaceAndValue[0]);
+ return new IdentityValuesDTO(namespace, namespaceAndValue[1], namespaceAndValue[0],value);
}
}
// it is not "prefix:value" but just "value"