org.codehaus.stax2.ri.evt.StartElementEventImpl Maven / Gradle / Ivy
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Stax2 API is an extension to basic Stax 1.0 API that adds significant new functionality, such as full-featured bi-direction validation interface and high-performance Typed Access API.
package org.codehaus.stax2.ri.evt;
import java.io.IOException;
import java.io.Writer;
import java.util.*;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.*;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Namespace;
import javax.xml.stream.events.StartElement;
import org.codehaus.stax2.XMLStreamWriter2;
import org.codehaus.stax2.ri.EmptyIterator;
import org.codehaus.stax2.ri.EmptyNamespaceContext;
/**
* Wstx {@link StartElement} implementation used when event is constructed
* from already objectified data, for example when constructed by the event
* factory.
*/
public class StartElementEventImpl
extends BaseEventImpl
implements StartElement
{
// // // Basic configuration
protected final QName _name;
protected final ArrayList _attrs;
protected final ArrayList _nsDecls;
/**
* Enclosing namespace context
*/
protected NamespaceContext _parentNsCtxt;
// // // Lazily constructed components
NamespaceContext _actualNsCtxt = null;
/*
/**********************************************************************
/* Life cycle
/**********************************************************************
*/
protected StartElementEventImpl(Location loc, QName name,
ArrayList attrs, ArrayList nsDecls,
NamespaceContext parentNsCtxt)
{
super(loc);
_name = name;
_attrs = attrs;
_nsDecls = nsDecls;
_parentNsCtxt = (parentNsCtxt == null) ?
EmptyNamespaceContext.getInstance() : parentNsCtxt;
}
public static StartElementEventImpl construct(Location loc, QName name,
Iterator attrIt, Iterator nsDeclIt,
NamespaceContext nsCtxt)
{
ArrayList attrs;
if (attrIt == null || !attrIt.hasNext()) {
attrs = null;
} else {
attrs = new ArrayList();
do {
// Cast is only done for early catching of incorrect types
attrs.add((Attribute) attrIt.next());
} while (attrIt.hasNext());
}
ArrayList nsDecls;
if (nsDeclIt == null || !nsDeclIt.hasNext()) {
nsDecls = null;
} else {
nsDecls = new ArrayList();
do {
nsDecls.add((Namespace) nsDeclIt.next()); // cast to catch type problems early
} while (nsDeclIt.hasNext());
}
return new StartElementEventImpl(loc, name, attrs, nsDecls, nsCtxt);
}
/*
/**********************************************************************
/* Implementation of abstract base methods, overrides
/**********************************************************************
*/
@Override
public StartElement asStartElement() { // overriden to save a cast
return this;
}
@Override
public int getEventType() {
return START_ELEMENT;
}
@Override
public boolean isStartElement() {
return true;
}
@Override
public void writeAsEncodedUnicode(Writer w)
throws XMLStreamException
{
try {
w.write('<');
String prefix = _name.getPrefix();
if (prefix != null && prefix.length() > 0) {
w.write(prefix);
w.write(':');
}
w.write(_name.getLocalPart());
// Any namespaces?
if (_nsDecls != null) {
for (int i = 0, len = _nsDecls.size(); i < len; ++i) {
w.write(' ');
((Namespace) _nsDecls.get(i)).writeAsEncodedUnicode(w);
}
}
// How about attrs?
if (_attrs != null) {
for (int i = 0, len = _attrs.size(); i < len; ++i) {
Attribute attr = (Attribute) _attrs.get(i);
// No point in adding default attributes?
if (attr.isSpecified()) {
w.write(' ');
attr.writeAsEncodedUnicode(w);
}
}
}
w.write('>');
} catch (IOException ie) {
throw new XMLStreamException(ie);
}
}
@Override
public void writeUsing(XMLStreamWriter2 sw) throws XMLStreamException
{
QName n = _name;
sw.writeStartElement(n.getPrefix(), n.getLocalPart(),
n.getNamespaceURI());
// Any namespaces?
if (_nsDecls != null) {
for (int i = 0, len = _nsDecls.size(); i < len; ++i) {
Namespace ns = (Namespace) _nsDecls.get(i);
String prefix = ns.getPrefix();
String uri = ns.getNamespaceURI();
if (prefix == null || prefix.length() == 0) {
sw.writeDefaultNamespace(uri);
} else {
sw.writeNamespace(prefix, uri);
}
}
}
// How about attrs?
if (_attrs != null) {
for (int i = 0, len = _attrs.size(); i < len; ++i) {
Attribute attr = (Attribute) _attrs.get(i);
// No point in adding default attributes?
if (attr.isSpecified()) {
QName name = attr.getName();
sw.writeAttribute(name.getPrefix(), name.getNamespaceURI(), name.getLocalPart(), attr.getValue());
}
}
}
}
/*
/**********************************************************************
/* Public API
/**********************************************************************
*/
@Override
public final QName getName() {
return _name;
}
@Override
public Iterator getNamespaces()
{
if (_nsDecls == null) {
return EmptyIterator.getInstance();
}
return _nsDecls.iterator();
}
@Override
public NamespaceContext getNamespaceContext()
{
if (_actualNsCtxt == null) {
if (_nsDecls == null) {
_actualNsCtxt = _parentNsCtxt;
} else {
_actualNsCtxt = MergedNsContext.construct(_parentNsCtxt, _nsDecls);
}
}
return _actualNsCtxt;
}
@Override
public String getNamespaceURI(String prefix)
{
if (_nsDecls != null) {
if (prefix == null) {
prefix = "";
}
for (int i = 0, len = _nsDecls.size(); i < len; ++i) {
Namespace ns = (Namespace) _nsDecls.get(i);
String thisPrefix = ns.getPrefix();
if (thisPrefix == null) {
thisPrefix = "";
}
if (prefix.equals(thisPrefix)) {
return ns.getNamespaceURI();
}
}
}
return null;
}
@Override
public Attribute getAttributeByName(QName nameIn)
{
if (_attrs == null) {
return null;
}
String ln = nameIn.getLocalPart();
String uri = nameIn.getNamespaceURI();
int len = _attrs.size();
boolean notInNs = (uri == null || uri.length() == 0);
for (int i = 0; i < len; ++i) {
Attribute attr = (Attribute) _attrs.get(i);
QName name = attr.getName();
if (name.getLocalPart().equals(ln)) {
String thisUri = name.getNamespaceURI();
if (notInNs) {
if (thisUri == null || thisUri.length() == 0) {
return attr;
}
} else {
if (uri.equals(thisUri)) {
return attr;
}
}
}
}
return null;
}
@Override
public Iterator getAttributes()
{
if (_attrs == null) {
return EmptyIterator.getInstance();
}
return _attrs.iterator();
}
/*
/**********************************************************************
/* Standard method impl
/**********************************************************************
*/
@Override
public boolean equals(Object o)
{
if (o == this) return true;
if (o == null) return false;
if (!(o instanceof StartElement)) return false;
StartElement other = (StartElement) o;
// First things first: names must match
if (_name.equals(other.getName())) {
/* Rest is much trickier. I guess the easiest way is to
* just blindly iterate through ns decls and attributes.
* The main issue is whether ordering should matter; it will,
* if just iterating. Would need to sort to get canonical
* comparison.
*/
if (iteratedEquals(getNamespaces(), other.getNamespaces())) {
return iteratedEquals(getAttributes(), other.getAttributes());
}
}
return false;
}
@Override
public int hashCode()
{
int hash = _name.hashCode();
hash = addHash(getNamespaces(), hash);
hash = addHash(getAttributes(), hash);
return hash;
}
}