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Open source Reference Implementation of JSR-67: SOAP with Attachments API for Java (SAAJ MR: 1.4)
/*
* Copyright (c) 2014, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.messaging.saaj.util.stax;
import java.util.Iterator;
import java.util.Arrays;
import java.util.List;
import java.util.LinkedList;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.soap.SOAPElement;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPMessage;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import org.w3c.dom.Comment;
import org.w3c.dom.Node;
/**
* SaajStaxWriter builds a SAAJ SOAPMessage by using XMLStreamWriter interface.
*
*
* Defers creation of SOAPElement until all the aspects of the name of the element are known.
* In some cases, the namespace uri is indicated only by the {@link #writeNamespace(String, String)} call.
* After opening an element ({@code writeStartElement}, {@code writeEmptyElement} methods), all attributes
* and namespace assignments are retained within {@link DeferredElement} object ({@code deferredElement} field).
* As soon as any other method than {@code writeAttribute}, {@code writeNamespace}, {@code writeDefaultNamespace}
* or {@code setNamespace} is called, the contents of {@code deferredElement} is transformed into new SOAPElement
* (which is appropriately inserted into the SOAPMessage under construction).
* This mechanism is necessary to fix JDK-8159058 issue.
*
*
* @author [email protected]
*/
public class SaajStaxWriter implements XMLStreamWriter {
protected SOAPMessage soap;
protected String envURI;
protected SOAPElement currentElement;
protected DeferredElement deferredElement;
static final protected String Envelope = "Envelope";
static final protected String Header = "Header";
static final protected String Body = "Body";
static final protected String xmlns = "xmlns";
public SaajStaxWriter(final SOAPMessage msg, String uri) throws SOAPException {
soap = msg;
this.envURI = uri;
this.deferredElement = new DeferredElement();
}
public SOAPMessage getSOAPMessage() {
return soap;
}
protected SOAPElement getEnvelope() throws SOAPException {
return soap.getSOAPPart().getEnvelope();
}
@Override
public void writeStartElement(final String localName) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
deferredElement.setLocalName(localName);
}
@Override
public void writeStartElement(final String ns, final String ln) throws XMLStreamException {
writeStartElement(null, ln, ns);
}
@Override
public void writeStartElement(final String prefix, final String ln, final String ns) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
if (envURI.equals(ns)) {
try {
if (Envelope.equals(ln)) {
currentElement = getEnvelope();
fixPrefix(prefix);
return;
} else if (Header.equals(ln)) {
currentElement = soap.getSOAPHeader();
fixPrefix(prefix);
return;
} else if (Body.equals(ln)) {
currentElement = soap.getSOAPBody();
fixPrefix(prefix);
return;
}
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
deferredElement.setLocalName(ln);
deferredElement.setNamespaceUri(ns);
deferredElement.setPrefix(prefix);
}
private void fixPrefix(final String prfx) throws XMLStreamException {
fixPrefix(prfx, currentElement);
}
private void fixPrefix(final String prfx, SOAPElement element) throws XMLStreamException {
String oldPrfx = element.getPrefix();
if (prfx != null && !prfx.equals(oldPrfx)) {
element.setPrefix(prfx);
}
}
@Override
public void writeEmptyElement(final String uri, final String ln) throws XMLStreamException {
writeStartElement(null, ln, uri);
}
@Override
public void writeEmptyElement(final String prefix, final String ln, final String uri) throws XMLStreamException {
writeStartElement(prefix, ln, uri);
}
@Override
public void writeEmptyElement(final String ln) throws XMLStreamException {
writeStartElement(null, ln, null);
}
@Override
public void writeEndElement() throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
if (currentElement != null) currentElement = currentElement.getParentElement();
}
@Override
public void writeEndDocument() throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
}
@Override
public void close() throws XMLStreamException {
}
@Override
public void flush() throws XMLStreamException {
}
@Override
public void writeAttribute(final String ln, final String val) throws XMLStreamException {
writeAttribute(null, null, ln, val);
}
@Override
public void writeAttribute(final String prefix, final String ns, final String ln, final String value) throws XMLStreamException {
if (ns == null && prefix == null && xmlns.equals(ln)) {
writeNamespace("", value);
} else {
if (deferredElement.isInitialized()) {
deferredElement.addAttribute(prefix, ns, ln, value);
} else {
addAttibuteToElement(currentElement, prefix, ns, ln, value);
}
}
}
@Override
public void writeAttribute(final String ns, final String ln, final String val) throws XMLStreamException {
writeAttribute(null, ns, ln, val);
}
@Override
public void writeNamespace(String prefix, final String uri) throws XMLStreamException {
// make prefix default if null or "xmlns" (according to javadoc)
String thePrefix = prefix == null || "xmlns".equals(prefix) ? "" : prefix;
if (deferredElement.isInitialized()) {
deferredElement.addNamespaceDeclaration(thePrefix, uri);
} else {
try {
currentElement.addNamespaceDeclaration(thePrefix, uri);
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
}
@Override
public void writeDefaultNamespace(final String uri) throws XMLStreamException {
writeNamespace("", uri);
}
@Override
public void writeComment(final String data) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
Comment c = soap.getSOAPPart().createComment(data);
currentElement.appendChild(c);
}
@Override
public void writeProcessingInstruction(final String target) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
Node n = soap.getSOAPPart().createProcessingInstruction(target, "");
currentElement.appendChild(n);
}
@Override
public void writeProcessingInstruction(final String target, final String data) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
Node n = soap.getSOAPPart().createProcessingInstruction(target, data);
currentElement.appendChild(n);
}
@Override
public void writeCData(final String data) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
Node n = soap.getSOAPPart().createCDATASection(data);
currentElement.appendChild(n);
}
@Override
public void writeDTD(final String dtd) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
}
@Override
public void writeEntityRef(final String name) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
Node n = soap.getSOAPPart().createEntityReference(name);
currentElement.appendChild(n);
}
@Override
public void writeStartDocument() throws XMLStreamException {
}
@Override
public void writeStartDocument(final String version) throws XMLStreamException {
if (version != null) soap.getSOAPPart().setXmlVersion(version);
}
@Override
public void writeStartDocument(final String encoding, final String version) throws XMLStreamException {
if (version != null) soap.getSOAPPart().setXmlVersion(version);
if (encoding != null) {
try {
soap.setProperty(SOAPMessage.CHARACTER_SET_ENCODING, encoding);
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
}
@Override
public void writeCharacters(final String text) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
try {
currentElement.addTextNode(text);
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
@Override
public void writeCharacters(final char[] text, final int start, final int len) throws XMLStreamException {
currentElement = deferredElement.flushTo(currentElement);
char[] chr = (start == 0 && len == text.length) ? text : Arrays.copyOfRange(text, start, start + len);
try {
currentElement.addTextNode(new String(chr));
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
@Override
public String getPrefix(final String uri) throws XMLStreamException {
return currentElement.lookupPrefix(uri);
}
@Override
public void setPrefix(final String prefix, final String uri) throws XMLStreamException {
// TODO: this in fact is not what would be expected from XMLStreamWriter
// (e.g. XMLStreamWriter for writing to output stream does not write anything as result of
// this method, it just rememebers that given prefix is associated with the given uri
// for the scope; to actually declare the prefix assignment in the resulting XML, one
// needs to call writeNamespace(...) method
// Kept for backwards compatibility reasons - this might be worth of further investigation.
if (deferredElement.isInitialized()) {
deferredElement.addNamespaceDeclaration(prefix, uri);
} else {
throw new XMLStreamException("Namespace not associated with any element");
}
}
@Override
public void setDefaultNamespace(final String uri) throws XMLStreamException {
setPrefix("", uri);
}
@Override
public void setNamespaceContext(final NamespaceContext context)throws XMLStreamException {
throw new UnsupportedOperationException();
}
@Override
public Object getProperty(final String name) throws IllegalArgumentException {
//TODO the following line is to make eclipselink happy ... they are aware of this problem -
if (javax.xml.stream.XMLOutputFactory.IS_REPAIRING_NAMESPACES.equals(name)) return Boolean.FALSE;
return null;
}
@Override
public NamespaceContext getNamespaceContext() {
return new NamespaceContext() {
@Override
public String getNamespaceURI(final String prefix) {
return currentElement.getNamespaceURI(prefix);
}
@Override
public String getPrefix(final String namespaceURI) {
return currentElement.lookupPrefix(namespaceURI);
}
@Override
public Iterator getPrefixes(final String namespaceURI) {
return new Iterator() {
String prefix = getPrefix(namespaceURI);
@Override
public boolean hasNext() {
return (prefix != null);
}
@Override
public String next() {
if (!hasNext()) throw new java.util.NoSuchElementException();
String next = prefix;
prefix = null;
return next;
}
@Override
public void remove() {}
};
}
};
}
static void addAttibuteToElement(SOAPElement element, String prefix, String ns, String ln, String value)
throws XMLStreamException {
try {
if (ns == null) {
element.setAttributeNS("", ln, value);
} else {
QName name = prefix == null ? new QName(ns, ln) : new QName(ns, ln, prefix);
element.addAttribute(name, value);
}
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
/**
* Holds details of element that needs to be deferred in order to manage namespace assignments correctly.
*
*
* An instance of can be set with all the aspects of the element name (local name, prefix, namespace uri).
* Attributes and namespace declarations (special case of attribute) can be added.
* Namespace declarations are handled so that the element namespace is updated if it is implied by the namespace
* declaration and the namespace was not set to non-{@code null} value previously.
*
*
*
* The state of this object can be {@link #flushTo(SOAPElement) flushed} to SOAPElement - new SOAPElement will
* be added a child element; the new element will have exactly the shape as represented by the state of this
* object. Note that the {@link #flushTo(SOAPElement)} method does nothing
* (and returns the argument immediately) if the state of this object is not initialized
* (i.e. local name is null).
*
*
* @author [email protected]
*/
static class DeferredElement {
private String prefix;
private String localName;
private String namespaceUri;
private final List namespaceDeclarations;
private final List attributeDeclarations;
DeferredElement() {
this.namespaceDeclarations = new LinkedList();
this.attributeDeclarations = new LinkedList();
reset();
}
/**
* Set prefix of the element.
* @param prefix namespace prefix
*/
public void setPrefix(final String prefix) {
this.prefix = prefix;
}
/**
* Set local name of the element.
*
*
* This method initializes the element.
*
*
* @param localName local name {@code not null}
*/
public void setLocalName(final String localName) {
if (localName == null) {
throw new IllegalArgumentException("localName can not be null");
}
this.localName = localName;
}
/**
* Set namespace uri.
*
* @param namespaceUri namespace uri
*/
public void setNamespaceUri(final String namespaceUri) {
this.namespaceUri = namespaceUri;
}
/**
* Adds namespace prefix assignment to the element.
*
* @param prefix prefix (not {@code null})
* @param namespaceUri namespace uri
*/
public void addNamespaceDeclaration(final String prefix, final String namespaceUri) {
if (null == this.namespaceUri && null != namespaceUri && prefix.equals(emptyIfNull(this.prefix))) {
this.namespaceUri = namespaceUri;
}
this.namespaceDeclarations.add(new NamespaceDeclaration(prefix, namespaceUri));
}
/**
* Adds attribute to the element.
* @param prefix prefix
* @param ns namespace
* @param ln local name
* @param value value
*/
public void addAttribute(final String prefix, final String ns, final String ln, final String value) {
if (ns == null && prefix == null && xmlns.equals(ln)) {
this.addNamespaceDeclaration(prefix, value);
} else {
this.attributeDeclarations.add(new AttributeDeclaration(prefix, ns, ln, value));
}
}
/**
* Flushes state of this element to the {@code target} element.
*
*
* If this element is initialized then it is added with all the namespace declarations and attributes
* to the {@code target} element as a child. The state of this element is reset to uninitialized.
* The newly added element object is returned.
*
*
* If this element is not initialized then the {@code target} is returned immediately, nothing else is done.
*
*
* @param target target element
* @return {@code target} or new element
* @throws XMLStreamException on error
*/
public SOAPElement flushTo(final SOAPElement target) throws XMLStreamException {
try {
if (this.localName != null) {
// add the element appropriately (based on namespace declaration)
final SOAPElement newElement;
if (this.namespaceUri == null) {
// add element with inherited scope
newElement = target.addChildElement(this.localName);
} else if (prefix == null) {
newElement = target.addChildElement(new QName(this.namespaceUri, this.localName));
} else {
newElement = target.addChildElement(this.localName, this.prefix, this.namespaceUri);
}
// add namespace declarations
for (NamespaceDeclaration namespace : this.namespaceDeclarations) {
newElement.addNamespaceDeclaration(namespace.prefix, namespace.namespaceUri);
}
// add attribute declarations
for (AttributeDeclaration attribute : this.attributeDeclarations) {
addAttibuteToElement(newElement,
attribute.prefix, attribute.namespaceUri, attribute.localName, attribute.value);
}
// reset state
this.reset();
return newElement;
} else {
return target;
}
// else after reset state -> not initialized
} catch (SOAPException e) {
throw new XMLStreamException(e);
}
}
/**
* Is the element initialized?
* @return boolean indicating whether it was initialized after last flush
*/
public boolean isInitialized() {
return this.localName != null;
}
private void reset() {
this.localName = null;
this.prefix = null;
this.namespaceUri = null;
this.namespaceDeclarations.clear();
this.attributeDeclarations.clear();
}
private static String emptyIfNull(String s) {
return s == null ? "" : s;
}
}
static class NamespaceDeclaration {
final String prefix;
final String namespaceUri;
NamespaceDeclaration(String prefix, String namespaceUri) {
this.prefix = prefix;
this.namespaceUri = namespaceUri;
}
}
static class AttributeDeclaration {
final String prefix;
final String namespaceUri;
final String localName;
final String value;
AttributeDeclaration(String prefix, String namespaceUri, String localName, String value) {
this.prefix = prefix;
this.namespaceUri = namespaceUri;
this.localName = localName;
this.value = value;
}
}
}