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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.cxf.aegis.xml.stax;
import java.io.OutputStream;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import org.apache.cxf.aegis.DatabindingException;
import org.apache.cxf.aegis.xml.AbstractMessageWriter;
import org.apache.cxf.aegis.xml.MessageWriter;
import org.apache.cxf.common.util.StringUtils;
import org.apache.cxf.staxutils.StaxUtils;
public class ElementWriter extends AbstractMessageWriter implements MessageWriter {
private XMLStreamWriter writer;
private String namespace;
private String name;
private String prefix;
/**
* Create an ElementWriter but without writing an element name.
*
* @param writer
*/
public ElementWriter(XMLStreamWriter writer) {
this.writer = writer;
}
public ElementWriter(XMLStreamWriter writer, String name, String namespace) {
this(writer, name, namespace, null);
}
public ElementWriter(XMLStreamWriter streamWriter, QName name) {
this(streamWriter, name.getLocalPart(), name.getNamespaceURI());
}
public ElementWriter(XMLStreamWriter writer, String name, String namespace, String prefix) {
this.writer = writer;
this.namespace = namespace;
this.name = name;
this.prefix = prefix;
try {
writeStartElement();
} catch (XMLStreamException e) {
throw new DatabindingException("Error writing document.", e);
}
}
/**
* @param os
* @throws XMLStreamException
*/
public ElementWriter(OutputStream os, String name, String namespace) throws XMLStreamException {
XMLOutputFactory ofactory = XMLOutputFactory.newInstance();
this.writer = ofactory.createXMLStreamWriter(os);
this.namespace = namespace;
this.name = name;
try {
writeStartElement();
} catch (XMLStreamException e) {
throw new DatabindingException("Error writing document.", e);
}
}
private void writeStartElement() throws XMLStreamException {
if (!StringUtils.isEmpty(namespace)) {
boolean declare = false;
// Did the user declare a prefix?
String decPrefix = writer.getNamespaceContext().getPrefix(namespace);
// If the user didn't specify a prefix, create one
if (StringUtils.isEmpty(prefix)
&& decPrefix == null) {
if (!StringUtils.isEmpty(namespace)) {
declare = true;
prefix = StaxUtils.getUniquePrefix(writer);
} else {
prefix = "";
if (!StringUtils.isEmpty(writer.getNamespaceContext().getNamespaceURI(""))) {
declare = true;
}
}
} else if (StringUtils.isEmpty(prefix)) {
prefix = decPrefix;
} else if (!prefix.equals(decPrefix)) {
declare = true;
}
writer.writeStartElement(prefix, name, namespace);
if (declare) {
writer.setPrefix(prefix, namespace);
writer.writeNamespace(prefix, namespace);
}
} else {
writer.writeStartElement(name);
}
}
/**
* @see org.apache.cxf.aegis.xml.MessageWriter#writeValue(java.lang.Object)
*/
public void writeValue(Object value) {
try {
if (value != null) {
writer.writeCharacters(value.toString());
}
} catch (XMLStreamException e) {
throw new DatabindingException("Error writing document.", e);
}
}
/**
* @see org.apache.cxf.aegis.xml.MessageWriter#getWriter(java.lang.String)
*/
public MessageWriter getElementWriter(String nm) {
return new ElementWriter(writer, nm, namespace);
}
public MessageWriter getElementWriter(String nm, String ns) {
return new ElementWriter(writer, nm, ns);
}
public MessageWriter getElementWriter(QName qname) {
/*
* No one really wants xmlns= in their XML, prefixes are preferred.
* If the input qname has no prefix, go ahead and use the constructor that will
* generate one.
*/
if ("".equals(qname.getPrefix())) {
return new ElementWriter(writer, qname.getLocalPart(), qname.getNamespaceURI());
} else {
return new ElementWriter(writer, qname.getLocalPart(),
qname.getNamespaceURI(),
qname.getPrefix());
}
}
public String getNamespace() {
return namespace;
}
public void close() {
try {
writer.writeEndElement();
writer.flush();
} catch (XMLStreamException e) {
throw new DatabindingException("Error writing document.", e);
}
}
public void flush() throws XMLStreamException {
writer.flush();
}
public XMLStreamWriter getXMLStreamWriter() {
return writer;
}
public MessageWriter getAttributeWriter(String nm) {
return new AttributeWriter(writer, nm, namespace);
}
public MessageWriter getAttributeWriter(String nm, String ns) {
return new AttributeWriter(writer, nm, ns);
}
public MessageWriter getAttributeWriter(QName qname) {
return new AttributeWriter(writer, qname.getLocalPart(), qname.getNamespaceURI());
}
public String getPrefixForNamespace(String ns) {
try {
String pfx = writer.getPrefix(ns);
if (pfx == null) {
pfx = StaxUtils.getUniquePrefix(writer);
writer.setPrefix(pfx, ns);
writer.writeNamespace(pfx, ns);
}
return prefix;
} catch (XMLStreamException e) {
throw new DatabindingException("Error writing document.", e);
}
}
public String getPrefixForNamespace(String ns, String hint) {
try {
String pfx = writer.getPrefix(ns);
String contextPfx = writer.getNamespaceContext().getPrefix(ns);
if (pfx == null) {
String ns2 = writer.getNamespaceContext().getNamespaceURI(hint);
// if the hint is "" (the default) and the context does
if (ns2 == null && !"".equals(hint)) {
pfx = hint;
} else if (ns.equals(ns2)) {
// just because it's in the context, doesn't mean it has been written.
pfx = hint;
} else if (contextPfx != null) {
pfx = contextPfx;
} else {
pfx = StaxUtils.getUniquePrefix(writer);
}
writer.setPrefix(pfx, ns);
writer.writeNamespace(pfx, ns);
}
return pfx;
} catch (XMLStreamException e) {
throw new DatabindingException("Error writing document.", e);
}
}
}
