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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.servicemix.soap.util.stax;
import java.io.InputStream;
import java.io.OutputStream;
import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import org.apache.servicemix.soap.api.Fault;
import org.apache.servicemix.soap.util.DomUtil;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Stax related utilities.
*
* Some of this code has been borrowed from the XFire project
*
* @author Guillaume Nodet
* @author Dan Diephouse
*/
public class StaxUtil {
private static XMLOutputFactory xof;
private static XMLInputFactory xif;
public static XMLStreamReader createReader(InputStream is) {
return createReader(is, null);
}
public static XMLStreamReader createReader(InputStream is, String encoding) {
try {
return getXMLInputFactory().createXMLStreamReader(is, encoding);
} catch (XMLStreamException e) {
throw new Fault(e);
}
}
public static XMLStreamReader createReader(Source source) {
if (source instanceof StaxSource) {
return ((StaxSource) source).getStreamReader();
}
if (source instanceof DOMSource) {
Node node = ((DOMSource) source).getNode();
if (node instanceof Element) {
return new DOMStreamReader((Element) node);
} else {
return new DOMStreamReader(DomUtil.getFirstChildElement(node));
}
} else {
try {
return getXMLInputFactory().createXMLStreamReader(source);
} catch (XMLStreamException e) {
throw new Fault(e);
}
}
}
public static Source createSource(XMLStreamReader reader) {
if (reader instanceof DOMStreamReader) {
return new DOMSource(((DOMStreamReader) reader).skipElement());
} else {
return new StaxSource(new FragmentStreamReader(reader));
}
}
public static Element createElement(XMLStreamReader reader) {
if (reader instanceof DOMStreamReader) {
return ((DOMStreamReader) reader).skipElement();
} else {
Source src = new StaxSource(new FragmentStreamReader(reader));
return DomUtil.parse(src).getDocumentElement();
}
}
public static XMLInputFactory getXMLInputFactory() {
if (xif == null) {
xif = XMLInputFactory.newInstance();
}
return xif;
}
public static XMLStreamWriter createWriter(OutputStream os) {
return createWriter(os, null);
}
public static XMLStreamWriter createWriter(OutputStream os, String encoding) {
try {
return getXMLOutputFactory().createXMLStreamWriter(os, encoding);
} catch (XMLStreamException e) {
throw new Fault(e);
}
}
public static XMLOutputFactory getXMLOutputFactory() {
if (xof == null) {
xof = XMLOutputFactory.newInstance();
}
return xof;
}
/**
* Reads a QName from the element text. Reader must be positioned at the
* start tag.
*/
public static QName readQName(XMLStreamReader reader) throws XMLStreamException {
String value = reader.getElementText();
if (value == null) {
return null;
}
int index = value.indexOf(":");
if (index == -1) {
return new QName(value);
}
String prefix = value.substring(0, index);
String localName = value.substring(index + 1);
String ns = reader.getNamespaceURI(prefix);
if (ns == null || localName == null) {
throw new RuntimeException("Invalid QName in mapping: " + value);
}
return new QName(ns, localName, prefix);
}
/**
* Copies the reader to the writer. The start and end document
* methods must be handled on the writer manually.
*
* TODO: if the namespace on the reader has been declared previously
* to where we are in the stream, this probably won't work.
*
* @param reader
* @param writer
* @throws XMLStreamException
*/
public static void copy( XMLStreamReader reader, XMLStreamWriter writer )
throws XMLStreamException
{
int read = 0; // number of elements read in
int event = reader.getEventType();
while ( reader.hasNext() )
{
switch( event )
{
case XMLStreamConstants.START_ELEMENT:
read++;
writeStartElement( reader, writer );
break;
case XMLStreamConstants.END_ELEMENT:
writer.writeEndElement();
read--;
if ( read <= 0 )
return;
break;
case XMLStreamConstants.CHARACTERS:
writer.writeCharacters( reader.getText() );
break;
case XMLStreamConstants.START_DOCUMENT:
case XMLStreamConstants.END_DOCUMENT:
case XMLStreamConstants.ATTRIBUTE:
case XMLStreamConstants.NAMESPACE:
break;
default:
break;
}
event = reader.next();
}
}
private static void writeStartElement(XMLStreamReader reader, XMLStreamWriter writer)
throws XMLStreamException
{
String local = reader.getLocalName();
String uri = reader.getNamespaceURI();
String prefix = reader.getPrefix();
if (prefix == null)
{
prefix = "";
}
if (uri == null)
{
uri = "";
}
String boundPrefix = writer.getPrefix(uri);
boolean writeElementNS = false;
if ( boundPrefix == null || !prefix.equals(boundPrefix) )
{
writeElementNS = true;
}
// Write out the element name
if (uri != null)
{
if (prefix.length() == 0)
{
writer.writeStartElement(local);
writer.setDefaultNamespace(uri);
}
else
{
writer.writeStartElement(prefix, local, uri);
writer.setPrefix(prefix, uri);
}
}
else
{
writer.writeStartElement( local );
}
// Write out the namespaces
for ( int i = 0; i < reader.getNamespaceCount(); i++ )
{
String nsURI = reader.getNamespaceURI(i);
String nsPrefix = reader.getNamespacePrefix(i);
if (nsPrefix == null) nsPrefix = "";
if ( nsPrefix.length() == 0 )
{
writer.writeDefaultNamespace(nsURI);
}
else
{
writer.writeNamespace(nsPrefix, nsURI);
}
if (nsURI.equals(uri) && nsPrefix.equals(prefix))
{
writeElementNS = false;
}
}
// Check if the namespace still needs to be written.
// We need this check because namespace writing works
// different on Woodstox and the RI.
if (writeElementNS)
{
if ( prefix == null || prefix.length() == 0 )
{
writer.writeDefaultNamespace(uri);
}
else
{
writer.writeNamespace(prefix, uri);
}
}
// Write out attributes
for ( int i = 0; i < reader.getAttributeCount(); i++ )
{
String ns = reader.getAttributeNamespace(i);
String nsPrefix = reader.getAttributePrefix(i);
if ( ns == null || ns.length() == 0 )
{
writer.writeAttribute(
reader.getAttributeLocalName(i),
reader.getAttributeValue(i));
}
else if (nsPrefix == null || nsPrefix.length() == 0)
{
writer.writeAttribute(
reader.getAttributeNamespace(i),
reader.getAttributeLocalName(i),
reader.getAttributeValue(i));
}
else
{
writer.writeAttribute(reader.getAttributePrefix(i),
reader.getAttributeNamespace(i),
reader.getAttributeLocalName(i),
reader.getAttributeValue(i));
}
}
}
/**
* Write a start element with the specified parameters
* @param writer
* @param uri
* @param local
* @param prefix
* @throws XMLStreamException
*/
public static void writeStartElement( XMLStreamWriter writer, String uri, String local, String prefix )
throws XMLStreamException
{
if (prefix == null)
{
prefix = "";
}
if (uri == null)
{
uri = "";
}
String boundPrefix = writer.getPrefix(uri);
boolean writeElementNS = false;
if ( boundPrefix == null || !prefix.equals(boundPrefix) )
{
writeElementNS = true;
}
// Write out the element name
if (uri != null)
{
if (prefix.length() == 0)
{
writer.writeStartElement(local);
writer.setDefaultNamespace(uri);
}
else
{
writer.writeStartElement(prefix, local, uri);
writer.setPrefix(prefix, uri);
}
}
else
{
writer.writeStartElement( local );
}
// Check if the namespace still needs to be written.
// We need this check because namespace writing works
// different on Woodstox and the RI.
if (writeElementNS)
{
if ( prefix.length() == 0 )
{
writer.writeDefaultNamespace(uri);
}
else
{
writer.writeNamespace(prefix, uri);
}
}
}
/**
* Write a start element with the given QName.
* However, if a namespace has already been bound to a prefix,
* use the existing one, else default to the prefix
* in the QName (if specified). Else, a prefix is generated.
*
* @param writer
* @param name
* @throws XMLStreamException
*/
public static void writeStartElement(XMLStreamWriter writer, QName name) throws XMLStreamException {
String prefix = choosePrefix(writer, name, false);
writeStartElement(writer, name.getNamespaceURI(), name.getLocalPart(), prefix);
}
/**
*
* @param out
* @param name
* @throws XMLStreamException
*/
public static void writeTextQName(XMLStreamWriter out, QName name) throws XMLStreamException {
String prefix = choosePrefix(out, name, true);
if (XMLConstants.DEFAULT_NS_PREFIX.equals(prefix)) {
out.writeCharacters(name.getLocalPart());
} else {
out.writeCharacters(prefix + ":" + name.getLocalPart());
}
}
protected static String choosePrefix(XMLStreamWriter out, QName name, boolean declare) throws XMLStreamException {
String uri = name.getNamespaceURI();
// If no namespace
if (uri == null || XMLConstants.NULL_NS_URI.equals(uri)) {
if (!XMLConstants.NULL_NS_URI.equals(out.getNamespaceContext().getNamespaceURI(XMLConstants.DEFAULT_NS_PREFIX))) {
out.setPrefix(XMLConstants.DEFAULT_NS_PREFIX, XMLConstants.NULL_NS_URI);
}
return XMLConstants.DEFAULT_NS_PREFIX;
// Need to write a prefix
} else {
String defPrefix = name.getPrefix();
// A prefix is specified
if (defPrefix != null && !XMLConstants.DEFAULT_NS_PREFIX.equals(defPrefix)) {
// if the uri is bound to the specified prefix, good, else
if (!uri.equals(out.getNamespaceContext().getNamespaceURI(defPrefix))) {
// if there is a prefix bound to the uri, use it
if (out.getNamespaceContext().getPrefix(uri) != null) {
defPrefix = out.getNamespaceContext().getPrefix(uri);
// get prefix from the writer
} else if (out.getPrefix(uri) != null) {
defPrefix = out.getPrefix(uri);
// we need to bind the prefix
} else if (declare) {
out.setPrefix(defPrefix, uri);
out.writeNamespace(defPrefix, uri);
}
}
// No prefix specified
} else {
// if there is a prefix bound to the uri, use it
if (out.getNamespaceContext().getPrefix(uri) != null) {
defPrefix = out.getNamespaceContext().getPrefix(uri);
// get prefix from the writer
} else if (out.getPrefix(uri) != null) {
defPrefix = out.getPrefix(uri);
// we need to generate a prefix
} else {
defPrefix = getUniquePrefix(out);
if (declare) {
out.setPrefix(defPrefix, uri);
out.writeNamespace(defPrefix, uri);
}
}
}
return defPrefix;
}
}
protected static String getUniquePrefix(XMLStreamWriter writer) {
int n = 1;
while (true) {
String nsPrefix = "ns" + n;
if (writer.getNamespaceContext().getNamespaceURI(nsPrefix) == null) {
return nsPrefix;
}
n++;
}
}
}
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