package org.apache.axis2.datasource.jaxb;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.OMText;
import org.apache.axiom.om.impl.llom.OMTextImpl;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.namespace.NamespaceContext;
import javax.activation.DataHandler;
import java.util.HashMap;
import java.util.Map;
import java.util.Stack;
import java.util.ArrayList;
import java.util.Iterator;
public class JAXBMTOMAwareOMBuilder implements XMLStreamWriter {
// this is the om Element we are going to create
private OMElement rootElement;
private OMFactory omFactory;
private OMElement currentOMElement;
private Stack omElementStack;
// this map contains the namespace key and OMNamespace
private Map namespaceOMNamesapceMap;
private int prefixNum;
private OMStreamNamespaceContext omStreamNamespaceContext;
// this list contains content Id's of all OMTexts which contains DataHandlers
private ArrayList<String> dataHandlerIdList;
public JAXBMTOMAwareOMBuilder() {
omFactory = OMAbstractFactory.getOMFactory();
omElementStack = new Stack();
currentOMElement = null;
omStreamNamespaceContext = new OMStreamNamespaceContext();
namespaceOMNamesapceMap = new HashMap();
dataHandlerIdList = new ArrayList<String>();
prefixNum = 0;
}
// serailizer must have finish serializing when we call this method.
public OMElement getOMElement() throws XMLStreamException {
if (!omElementStack.isEmpty()) {
throw new XMLStreamException("This is an invalid Xml ");
}
return rootElement;
}
private OMNamespace getOMNamespace(String namespace, String prefix) throws XMLStreamException {
OMNamespace omNamespace = null;
if (namespace != null) {
if (namespaceOMNamesapceMap.containsKey(namespace)) {
omNamespace = (OMNamespace) namespaceOMNamesapceMap.get(namespace);
} else {
if (prefix == null) {
prefix = "ns" + ++prefixNum;
} else if (this.omStreamNamespaceContext.getNamespaceURI(prefix) != null) {
throw new XMLStreamException("the prefix ==> " + prefix +
" Already exists for namespace ==> " + namespace);
}
omNamespace = omFactory.createOMNamespace(namespace, prefix);
this.omStreamNamespaceContext.registerNamespace(namespace, prefix);
namespaceOMNamesapceMap.put(namespace, omNamespace);
}
}
return omNamespace;
}
public void writeStartElement(String localName) throws XMLStreamException {
writeStartElement(null, localName, null);
}
public void writeStartElement(String namespace, String localName) throws XMLStreamException {
writeStartElement(null, localName, namespace);
}
public void writeStartElement(String prefix, String localName,
String namespace) throws XMLStreamException {
OMNamespace omNamespace = getOMNamespace(namespace, prefix);
currentOMElement = omFactory.createOMElement(localName, omNamespace);
if (!omElementStack.isEmpty()) {
// we always keep the parent at the top of the stack
OMElement parent = (OMElement) omElementStack.peek();
parent.addChild(currentOMElement);
} else {
// i.e this must be an start root element
rootElement = currentOMElement;
}
// set this as the top element
omElementStack.push(currentOMElement);
}
public void writeEmptyElement(String namespaceURI,
String localName) throws XMLStreamException {
writeEmptyElement(null, localName, namespaceURI);
}
public void writeEmptyElement(String prefix, String localName,
String namespaceURI) throws XMLStreamException {
writeStartElement(prefix, localName, namespaceURI);
writeEndElement();
}
public void writeEmptyElement(String localName) throws XMLStreamException {
writeEmptyElement(null, localName, null);
}
public void writeEndElement() throws XMLStreamException {
omElementStack.pop();
}
public void writeEndDocument() throws XMLStreamException {
// nothing to do
}
public void close() throws XMLStreamException {
// nothing to do
}
public void flush() throws XMLStreamException {
// nothing to do
}
public void writeAttribute(String attributeName,
String attributeValue) throws XMLStreamException {
writeAttribute(null, null, attributeName, attributeValue);
}
public void writeAttribute(
String prefix, String namespace, String attributeName,
String attributeValue) throws XMLStreamException {
currentOMElement.addAttribute(attributeName,
attributeValue, getOMNamespace(namespace, prefix));
}
public void writeAttribute(String namespace, String attributeName, String attributeValue)
throws XMLStreamException {
writeAttribute(null, namespace, attributeName, attributeValue);
}
public void writeNamespace(String prefix, String namespaceURI) throws XMLStreamException {
if (namespaceURI != null) {
OMNamespace omNamespace = getOMNamespace(namespaceURI, prefix);
currentOMElement.declareNamespace(omNamespace);
}
}
public void writeDefaultNamespace(String namespace) throws XMLStreamException {
rootElement.declareDefaultNamespace(namespace);
getOMNamespace(namespace, "");
}
public void writeComment(String string) throws XMLStreamException {
omFactory.createOMComment(currentOMElement, string);
}
public void writeProcessingInstruction(String string) throws XMLStreamException {
throw new UnsupportedOperationException("this method has not yet been implemented");
}
public void writeProcessingInstruction(String string, String string1)
throws XMLStreamException {
throw new UnsupportedOperationException("this method has not yet been implemented");
}
public void writeCData(String string) throws XMLStreamException {
throw new UnsupportedOperationException("this method has not yet been implemented");
}
public void writeDTD(String string) throws XMLStreamException {
throw new UnsupportedOperationException("this method has not yet been implemented");
}
public void writeEntityRef(String string) throws XMLStreamException {
throw new UnsupportedOperationException("this method has not yet been implemented");
}
public void writeStartDocument() throws XMLStreamException {
// nothing to do
}
public void writeStartDocument(String string) throws XMLStreamException {
// nothing to do
}
public void writeStartDocument(String string, String string1) throws XMLStreamException {
// nothing to do
}
public void writeCharacters(String string) throws XMLStreamException {
/**
* If the recieved charaters are going to replace an already existing OMTextImpl which
* contains a data handler inside, don't allow it. This is because, if this is allowed,
* MTOM functionality will not work and the data will be written in base64.
*/
Iterator itr = currentOMElement.getChildren();
while (itr.hasNext()) {
Object node = itr.next();
if (node instanceof OMTextImpl) {
OMTextImpl omText = (OMTextImpl) node;
if (dataHandlerIdList.contains(omText.getContentID())) {
return;
}
}
}
currentOMElement.setText(string);
}
public void writeCharacters(char[] chars, int i, int i1) throws XMLStreamException {
writeCharacters(new String(chars, i, i1));
}
public String getPrefix(String namespace) throws XMLStreamException {
return this.omStreamNamespaceContext.getPrefix(namespace);
}
public void setPrefix(String prefix, String uri) throws XMLStreamException {
// this method will add the namespace correctly.
getOMNamespace(uri, prefix);
}
public void setDefaultNamespace(String namespace) throws XMLStreamException {
rootElement.declareDefaultNamespace(namespace);
getOMNamespace(namespace, "");
}
public void setNamespaceContext(NamespaceContext namespaceContext) throws XMLStreamException {
throw new UnsupportedOperationException("this method has not yet been implemented");
}
public NamespaceContext getNamespaceContext() {
return this.omStreamNamespaceContext;
}
public Object getProperty(String string) throws IllegalArgumentException {
//TODO - need to fix properly
return Boolean.FALSE;
}
public void writeDataHandler(DataHandler dataHandler) {
OMText omText = omFactory.createOMText(dataHandler, true);
// Add the content id into the list
dataHandlerIdList.add(omText.getContentID());
currentOMElement.addChild(omText);
}
}