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/*
* $Id: StAXStreamWriter.java,v 1.1 2004/07/15 02:15:56 cniles Exp $
*
* Copyright (c) 2004, Christian Niles, unit12.net
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Christian Niles, Unit12, nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
package javanet.staxutils.io;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import javanet.staxutils.helpers.ElementContext;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
/**
* An {@link XMLStreamWriter} implementation that writes to a character stream.
*
* @author Christian Niles
* @version $Revision: 1.1 $
*/
public class StAXStreamWriter implements XMLStreamWriter {
/** The destination stream. */
private Writer writer;
/** Whether the stream has been closed or not. */
private boolean closed;
/** The root namespace context. */
private NamespaceContext rootContext;
/**
* The current {@link ElementContext}. used to keep track of opened elements.
*/
private ElementContext elementContext;
/**
* Constructs a StAXStreamWriter that writes to the provided
* {@link OutputStream} using the platform default encoding.
*
* @param stream
* The destination stream.
*/
public StAXStreamWriter(OutputStream stream) {
this(new OutputStreamWriter(stream));
}
/**
* Constructs a StAXStreamWriter that writes to the provided
* {@link OutputStream} using the specified encoding.
*
* @param stream
* The destination stream.
* @param encoding
* The output encoding.
* @throws UnsupportedEncodingException
* If the encoding isn't supported.
*/
public StAXStreamWriter(OutputStream stream, String encoding) throws UnsupportedEncodingException {
this(new OutputStreamWriter(stream, encoding));
}
/**
* Constructs a StAXStreamWriter that writes to the provided
* {@link Writer}.
*
* @param writer
* The destination {@link Writer} instance.
*/
public StAXStreamWriter(Writer writer) {
this.writer = writer;
}
/**
* Constructs a StAXStreamWriter that writes to the provided
* {@link Writer}.
*
* @param writer
* The destination {@link Writer} instance.
* @param rootContext
* The root namespace context.
*/
public StAXStreamWriter(Writer writer, NamespaceContext rootContext) {
this.writer = writer;
this.rootContext = rootContext;
}
public synchronized void close() throws XMLStreamException {
if (!closed) {
flush();
closed = true;
writer = null;
}
}
public synchronized void flush() throws XMLStreamException {
// if cached element info exists, send it
closeElementContext();
try {
writer.flush();
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public String getPrefix(String uri) throws XMLStreamException {
return getNamespaceContext().getPrefix(uri);
}
public Object getProperty(String name) throws IllegalArgumentException {
// TODO provide access to properties?
throw new IllegalArgumentException(name + " property not supported");
}
public void writeStartDocument() throws XMLStreamException {
try {
XMLWriterUtils.writeStartDocument(writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public void writeStartDocument(String version) throws XMLStreamException {
try {
XMLWriterUtils.writeStartDocument(version, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeStartDocument(String encoding, String version)
throws XMLStreamException {
// TODO perform check that StartDocument can be entered
try {
XMLWriterUtils.writeStartDocument(version, encoding, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeEndDocument() throws XMLStreamException {
// flush any cached start element content
closeElementContext();
// close any tags
while (elementContext != null) {
writeEndElement();
}
}
public synchronized void writeCData(String data) throws XMLStreamException {
if (data == null) {
throw new IllegalArgumentException("CDATA argument was null");
}
// flush any cached start element content
closeElementContext();
// TODO verify data is appropriate for CDATA
try {
XMLWriterUtils.writeCData(data, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeCharacters(char[] text, int start, int len)
throws XMLStreamException {
if (text == null) {
throw new IllegalArgumentException("Character text argument was null");
}
// flush any cached start element content
closeElementContext();
try {
XMLWriterUtils.writeCharacters(text, start, len, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeCharacters(String text) throws XMLStreamException {
if (text == null) {
throw new IllegalArgumentException("Character text argument was null");
}
// flush any cached start element content
closeElementContext();
try {
XMLWriterUtils.writeCharacters(text, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeComment(String data) throws XMLStreamException {
if (data == null) {
throw new IllegalArgumentException("Comment data argument was null");
}
// flush any cached start element content
closeElementContext();
// TODO check comment for non-SGML compatible characters?
try {
XMLWriterUtils.writeComment(data, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeDTD(String dtd) throws XMLStreamException {
if (dtd == null) {
throw new IllegalArgumentException("dtd argument was null");
}
try {
XMLWriterUtils.writeDTD(dtd, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeEntityRef(String name) throws XMLStreamException {
// flush any cached start element content
closeElementContext();
try {
XMLWriterUtils.writeEntityReference(name, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public synchronized void writeProcessingInstruction(String target, String data)
throws XMLStreamException {
// flush any cached start element content
closeElementContext();
// TODO test processing instruction validity?
try {
XMLWriterUtils.writeProcessingInstruction(target, data, writer);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public void writeProcessingInstruction(String target) throws XMLStreamException {
writeProcessingInstruction(target, null);
}
public NamespaceContext getNamespaceContext() {
return elementContext;
}
public void setNamespaceContext(NamespaceContext context) throws XMLStreamException {
if (this.rootContext == null && elementContext == null) {
this.rootContext = context;
} else {
throw new IllegalStateException(
"NamespaceContext has already been set or document is already in progress");
}
}
public synchronized void setDefaultNamespace(String uri) throws XMLStreamException {
elementContext.putNamespace("", uri);
}
public synchronized void setPrefix(String prefix, String uri) throws XMLStreamException {
elementContext.putNamespace(prefix, uri);
}
/**
* Core start tag output method called by all other
* writeXXXElement methods.
*
* @param prefix
* The tag prefix.
* @param localName
* The tag local name.
* @param namespaceURI
* The namespace URI of the prefix.
* @param isEmpty
* Whether the tag is empty.
* @throws XMLStreamException
* If an error occurs writing the tag to the stream.
*/
public synchronized void writeStartElement(String prefix, String localName, String namespaceURI,
boolean isEmpty) throws XMLStreamException {
if (prefix == null) {
throw new IllegalArgumentException("prefix may not be null @ [" + getCurrentPath() + "]");
} else if (localName == null) {
throw new IllegalArgumentException("localName may not be null @ [" + getCurrentPath() + "]");
} else if (namespaceURI == null) {
throw new IllegalArgumentException("namespaceURI may not be null @ [" + getCurrentPath()
+ "]");
}
// new context is beginning; close the current context if needed
if (elementContext != null) {
closeElementContext();
// test if we just closed an empty root context
if (elementContext == null) {
throw new XMLStreamException("Writing start tag after close of root element");
}
}
// create the new context
QName name = new QName(namespaceURI, localName, prefix);
elementContext = new ElementContext(name, elementContext, isEmpty);
}
public void writeStartElement(String prefix, String localName, String namespaceURI)
throws XMLStreamException {
writeStartElement(prefix, localName, namespaceURI, false);
}
public void writeStartElement(String namespaceURI, String localName) throws XMLStreamException {
writeStartElement("", localName, namespaceURI, false);
}
public void writeStartElement(String localName) throws XMLStreamException {
writeStartElement("", localName, "", false);
}
public void writeEmptyElement(String prefix, String localName, String namespaceURI)
throws XMLStreamException {
writeStartElement(prefix, localName, namespaceURI, true);
}
public void writeEmptyElement(String namespaceURI, String localName) throws XMLStreamException {
writeStartElement("", localName, namespaceURI, true);
}
public void writeEmptyElement(String localName) throws XMLStreamException {
writeStartElement("", localName, "", true);
}
public synchronized void writeAttribute(QName name, String value) throws XMLStreamException {
if (elementContext == null || elementContext.isReadOnly()) {
throw new XMLStreamException(getCurrentPath()
+ ": attributes must be written directly following a start element.");
}
elementContext.putAttribute(name, value);
}
public void writeAttribute(String prefix, String namespaceURI, String localName, String value)
throws XMLStreamException {
if (prefix == null) {
throw new IllegalArgumentException("attribute prefix may not be null @ [" + getCurrentPath()
+ "]");
} else if (localName == null) {
throw new IllegalArgumentException("attribute localName may not be null @ ["
+ getCurrentPath() + "]");
} else if (namespaceURI == null) {
throw new IllegalArgumentException("attribute namespaceURI may not be null @ ["
+ getCurrentPath() + "]");
}
writeAttribute(new QName(namespaceURI, localName, prefix), value);
}
public void writeAttribute(String namespaceURI, String localName, String value)
throws XMLStreamException {
writeAttribute("", namespaceURI, localName, value);
}
public void writeAttribute(String localName, String value) throws XMLStreamException {
writeAttribute("", "", localName, value);
}
public void writeDefaultNamespace(String namespaceURI) throws XMLStreamException {
writeNamespace("", namespaceURI);
}
public synchronized void writeNamespace(String prefix, String namespaceURI)
throws XMLStreamException {
if (prefix == null) {
throw new IllegalArgumentException("Namespace prefix may not be null @ [" + getCurrentPath()
+ "]");
} else if (namespaceURI == null) {
throw new IllegalArgumentException("Namespace URI may not be null @ [" + getCurrentPath()
+ "]");
}
if (elementContext != null && !elementContext.isReadOnly()) {
elementContext.putNamespace(prefix, namespaceURI);
} else {
throw new XMLStreamException(getCurrentPath()
+ ": Namespaces must be written directly following a start tag");
}
}
public synchronized void writeEndElement() throws XMLStreamException {
// flush any cached start element content
closeElementContext();
if (elementContext != null) {
QName name = elementContext.getName();
try {
XMLWriterUtils.writeEndElement(name, writer);
} catch (IOException e) {
throw new XMLStreamException(getCurrentPath() + ": Error writing end element to stream", e);
}
// pop the context
elementContext = elementContext.getParentContext();
} else {
throw new XMLStreamException("Unmatched END_ELEMENT");
}
}
/**
* Returns the current position of the writer as a path of {@link QName}
* strings.
*
* @return The current position of the writer.
*/
public synchronized String getCurrentPath() {
if (elementContext == null) {
return "/";
} else {
return elementContext.getPath();
}
}
/**
* Closes the current {@link ElementContext}, writing any cached content and
* making it read-only. If the current context is empty, it will be popped and
* replaced with its parent context. If no context is open, this method has no
* effects.
*
* @throws XMLStreamException
* If an error occurs flushing any element content.
*/
protected void closeElementContext() throws XMLStreamException {
if (elementContext != null && !elementContext.isReadOnly()) {
elementContext.setReadOnly();
// it hasn't been closed yet, so write it
try {
writer.write('<');
XMLWriterUtils.writeQName(elementContext.getName(), writer);
for (int i = 0, s = elementContext.attributeCount(); i < s; i++) {
QName name = elementContext.getAttributeName(i);
String value = elementContext.getAttribute(i);
writer.write(' ');
XMLWriterUtils.writeAttribute(name, value, writer);
}
for (int i = 0, s = elementContext.namespaceCount(); i < s; i++) {
String prefix = elementContext.getNamespacePrefix(i);
String uri = elementContext.getNamespaceURI(i);
writer.write(' ');
XMLWriterUtils.writeNamespace(prefix, uri, writer);
}
if (elementContext.isEmpty()) {
writer.write("/>");
elementContext = elementContext.getParentContext();
} else {
writer.write('>');
}
} catch (IOException e) {
throw new XMLStreamException(getCurrentPath() + ": error writing start tag to stream", e);
}
}
}
}
