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Kernel for Resin Java Application Server
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/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Emil Ong
*/
package com.caucho.xml.stream;
import static javax.xml.XMLConstants.*;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLOutputFactory;
import static javax.xml.stream.XMLStreamConstants.*;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import java.io.IOException;
import java.util.Iterator;
import com.caucho.util.L10N;
/**
* Utility class to do namespace repairs on XMLStreamWriters that don't have
* repair enabled. Used by JAXB.
**/
public class StaxUtil {
public static final L10N L = new L10N(StaxUtil.class);
public static QName resolveStringToQName(String string, XMLStreamReader in)
throws XMLStreamException
{
return resolveStringToQName(string, in.getNamespaceContext());
}
public static QName resolveStringToQName(String string,
NamespaceContext context)
throws XMLStreamException
{
int colon = string.indexOf(':');
if (colon < 0)
return new QName(string);
if (colon + 1 >= string.length())
throw new XMLStreamException(L.l("Invalid qualified name: {0}", string));
String prefix = string.substring(0, colon);
String localName = string.substring(colon + 1);
String namespace = context.getNamespaceURI(prefix);
if (NULL_NS_URI.equals(namespace))
throw new XMLStreamException(L.l("No namespace for qualifed name: {0}", string));
return new QName(namespace, localName, prefix);
}
/**
* Ensures that a given namespace exists within the namespace context
* given.
**/
public static void repairNamespace(XMLStreamWriter out, String namespace)
throws XMLStreamException
{
try {
Object repairing =
out.getProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES);
if (Boolean.TRUE.equals(repairing))
return;
}
catch (IllegalArgumentException e) {
}
catch (NullPointerException e) {
}
getNamespacePrefix(out, namespace);
}
/**
* Ensures that a given namespace exists within the namespace context
* given and returns the prefix.
**/
public static String getNamespacePrefix(XMLStreamWriter out, String namespace)
throws XMLStreamException
{
NamespaceContext context = out.getNamespaceContext();
String prefix = context.getPrefix(namespace);
if (prefix != null)
return prefix;
if (context instanceof NamespaceWriterContext) {
NamespaceWriterContext writerContext = (NamespaceWriterContext) context;
boolean repair = writerContext.getRepair();
writerContext.setRepair(true);
prefix = writerContext.declare(namespace);
writerContext.setRepair(repair);
return prefix;
}
else {
// not one of ours...
// we have to search for a unique prefix...
int i = 0;
String unique = "ns" + i;
while (true) {
boolean found = false;
Iterator iterator = context.getPrefixes(namespace);
while (iterator.hasNext()) {
prefix = iterator.next().toString();
if (prefix.equals(unique)) {
i++;
unique = "ns" + i;
found = true;
break;
}
}
if (! found)
break;
}
out.writeNamespace(unique, namespace);
return unique;
}
}
/**
* Ensures that a given prefix->namespace mapping exists within the
* namespace context given.
**/
public static void repairNamespace(XMLStreamWriter out,
String prefix, String namespace)
throws XMLStreamException
{
try {
Object repairing =
out.getProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES);
if (Boolean.TRUE.equals(repairing))
return;
}
catch (IllegalArgumentException e) {
}
catch (NullPointerException e) {
}
NamespaceContext context = out.getNamespaceContext();
String oldPrefix = context.getPrefix(namespace);
if (! prefix.equals(oldPrefix))
out.writeNamespace(prefix, namespace);
}
public static XMLStreamWriter toRepairingXMLStreamWriter(XMLStreamWriter out)
{
try {
Object repairing =
out.getProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES);
if (Boolean.TRUE.equals(repairing))
return out;
}
catch (IllegalArgumentException e) {
}
catch (NullPointerException e) {
}
if (out instanceof XMLStreamWriterImpl) {
((XMLStreamWriterImpl) out).setRepair(true);
return out;
}
else {
return new XMLStreamWriterRepairingWrapper(out);
}
}
/**
* Copys all the events from the input to the output, without going past
* an unmatch end element.
*
* E.g.: if the input is at the start of , it will only read just past
*
*
*
*
*
*
**/
public static void copyReaderToWriter(XMLStreamReader in, XMLStreamWriter out)
throws XMLStreamException
{
int depth = 0;
do {
switch (in.getEventType()) {
case ATTRIBUTE:
break;
case CDATA:
out.writeCData(in.getText());
break;
case CHARACTERS:
out.writeCharacters(in.getText());
break;
case COMMENT:
out.writeComment(in.getText());
break;
case DTD:
out.writeDTD(in.getText());
break;
case END_DOCUMENT:
out.writeEndDocument();
break;
case END_ELEMENT:
depth--;
if (depth < 0) {
out.flush();
return;
}
out.writeEndElement();
break;
case ENTITY_REFERENCE:
out.writeEntityRef(in.getText());
break;
case NAMESPACE:
break;
case PROCESSING_INSTRUCTION:
out.writeProcessingInstruction(in.getPITarget(), in.getPIData());
break;
case SPACE:
out.writeCharacters(in.getText());
break;
case START_DOCUMENT:
out.writeStartDocument(in.getEncoding(), in.getVersion());
break;
case START_ELEMENT:
QName qname = in.getName();
if (qname.getNamespaceURI() == null ||
"".equals(qname.getNamespaceURI()))
out.writeStartElement(qname.getLocalPart());
else if (qname.getPrefix() == null || "".equals(qname.getPrefix()))
out.writeStartElement(qname.getNamespaceURI(),
qname.getLocalPart());
else
out.writeStartElement(qname.getPrefix(),
qname.getLocalPart(),
qname.getNamespaceURI());
for (int i = 0; i < in.getAttributeCount(); i++) {
qname = in.getAttributeName(i);
String value = in.getAttributeValue(i);
if (qname.getNamespaceURI() == null ||
"".equals(qname.getNamespaceURI()))
out.writeAttribute(qname.getLocalPart(), value);
else if (qname.getPrefix() == null || "".equals(qname.getPrefix()))
out.writeAttribute(qname.getNamespaceURI(),
qname.getLocalPart(),
value);
else
out.writeAttribute(qname.getPrefix(),
qname.getNamespaceURI(),
qname.getLocalPart(),
value);
}
for (int i = 0; i < in.getNamespaceCount(); i++)
out.writeNamespace(in.getNamespacePrefix(i), in.getNamespaceURI(i));
depth++;
break;
}
if (in.hasNext())
in.next();
else
break;
}
while (depth >= 0);
out.flush();
}
public static String constantToString(int constant)
throws XMLStreamException
{
switch(constant) {
case ATTRIBUTE: return "ATTRIBUTE";
case CDATA: return "CDATA";
case CHARACTERS: return "CHARACTERS";
case COMMENT: return "COMMENT";
case DTD: return "DTD";
case END_DOCUMENT: return "END_DOCUMENT";
case END_ELEMENT: return "END_ELEMENT";
case ENTITY_DECLARATION: return "ENTITY_DECLARATION";
case ENTITY_REFERENCE: return "ENTITY_REFERENCE";
case NAMESPACE: return "NAMESPACE";
case NOTATION_DECLARATION: return "NOTATION_DECLARATION";
case PROCESSING_INSTRUCTION: return "PROCESSING_INSTRUCTION";
case SPACE: return "SPACE";
case START_DOCUMENT: return "START_DOCUMENT";
case START_ELEMENT: return "START_ELEMENT";
case -1:
throw new XMLStreamException(L.l("Unexpected end of stream"));
default:
throw new RuntimeException(L.l("constantToString({0}) unknown", constant));
}
}
public static String printStreamState(XMLStreamReader in)
throws XMLStreamException
{
StringBuilder sb = new StringBuilder(constantToString(in.getEventType()));
if (in.getEventType() == in.START_ELEMENT ||
in.getEventType() == in.END_ELEMENT) {
sb.append(": ");
sb.append(in.getName());
}
else if (in.getEventType() == in.CHARACTERS) {
sb.append(": ");
sb.append(in.getText());
}
return sb.toString();
}
/**
* Converts a QName to a String using the context of a XMLStreamWriter.
* Intended for writing QNames as attributes or text in a XMLStreamWriter
* that's passed in.
**/
public static String qnameToString(XMLStreamWriter out, QName qname)
throws XMLStreamException
{
if (qname.getNamespaceURI() == null || "".equals(qname.getNamespaceURI()))
return qname.getLocalPart();
NamespaceContext context = out.getNamespaceContext();
String prefix = context.getPrefix(qname.getNamespaceURI());
if (prefix == null) {
if (qname.getPrefix() != null && ! "".equals(qname.getPrefix())) {
out.writeNamespace(qname.getPrefix(), qname.getNamespaceURI());
return qname.getPrefix() + ':' + qname.getLocalPart();
}
prefix = getNamespacePrefix(out, qname.getNamespaceURI());
// XXX this shouldn't be necessary
out.writeNamespace(prefix, qname.getNamespaceURI());
}
return prefix + ':' + qname.getLocalPart();
}
public static void writeStartElement(XMLStreamWriter out, QName name)
throws XMLStreamException
{
if (name == null)
return;
if (name.getPrefix() != null && ! "".equals(name.getPrefix()))
out.writeStartElement(name.getPrefix(),
name.getLocalPart(),
name.getNamespaceURI());
else if (name.getNamespaceURI() != null &&
! "".equals(name.getNamespaceURI()))
out.writeStartElement(name.getNamespaceURI(), name.getLocalPart());
else
out.writeStartElement(name.getLocalPart());
}
public static void writeEndElement(XMLStreamWriter out, QName name)
throws XMLStreamException
{
if (name == null)
return;
out.writeEndElement();
}
public static void writeAttribute(XMLStreamWriter out,
QName name, String value)
throws XMLStreamException
{
if (name.getNamespaceURI() == null || "".equals(name.getNamespaceURI()))
out.writeAttribute(name.getLocalPart(), value);
else if (name.getPrefix() == null || "".equals(name.getPrefix()))
out.writeAttribute(name.getNamespaceURI(), name.getLocalPart(), value);
else
out.writeAttribute(name.getPrefix(),
name.getNamespaceURI(),
name.getLocalPart(),
value);
}
}