/*
* Copyright (c) 1998-2011 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 Adam Megacz
*/
package com.caucho.xml2;
import com.caucho.vfs.WriteStream;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Maintains a stack of namespace contexts
*/
public class NamespaceContextImpl
{
// The current namespace bindings
private final HashMap<String,NamespaceBinding> _bindings
= new HashMap<String,NamespaceBinding>();
// The stack of element bindings
private ElementBinding []_stack = new ElementBinding[32];
private int _stackTop;
private NamespaceBinding _nullEltBinding;
private NamespaceBinding _nullAttrBinding;
private int _uniqueId = 0;
private int _version = 0;
NamespaceContextImpl()
{
_nullEltBinding = new NamespaceBinding(null, null, 0);
_nullAttrBinding = new NamespaceBinding(null, null, 0);
_stackTop = 1;
}
/**
* Creates a new subcontext and enters it
*/
public void push(SaxIntern.Entry entry)
{
ElementBinding elt = _stack[_stackTop];
if (elt == null) {
elt = new ElementBinding();
_stack[_stackTop] = elt;
}
_stackTop++;
elt.setName(entry);
}
/**
* deletes the current context and enters its parent
*/
public void pop(SaxIntern.Entry entry)
{
ElementBinding eltBinding = _stack[--_stackTop];
if (eltBinding != null) {
ArrayList<Decl> oldBinding = eltBinding.getOldBindingList();
for (int i = 0; oldBinding != null && i < oldBinding.size(); i++) {
Decl decl = oldBinding.get(i);
NamespaceBinding binding = decl.getBinding();
_version++;
binding.setUri(decl.getOldUri());
binding.setVersion(_version);
}
eltBinding.clear();
}
}
public int getDepth()
{
return _stackTop - 1;
}
/**
* declares a new namespace prefix in the current context
*/
public void declare(String prefix, String uri)
{
NamespaceBinding binding = getElementNamespace(prefix);
ElementBinding eltBinding = _stack[_stackTop - 1];
if (eltBinding == null) {
eltBinding = new ElementBinding();
_stack[_stackTop - 1] = eltBinding;
}
eltBinding.addOldBinding(binding, prefix, binding.getUri(), uri);
_version++;
binding.setUri(uri);
binding.setVersion(_version);
}
/**
* declares a new namespace prefix in the current context; the
* auto-allocated prefix is returned
*/
public String declare(String uri)
{
String prefix = "ns"+ _uniqueId++;
declare(prefix, uri);
return prefix;
}
/**
* looks up the prefix, returns the uri it corresponds to
*/
public String getUri(String prefix)
{
NamespaceBinding binding = _bindings.get(prefix);
if (binding != null)
return binding.getUri();
else
return null;
}
public String getNamespaceURI(String prefix)
{
NamespaceBinding binding = _bindings.get(prefix);
if (binding != null)
return binding.getUri();
String uri = null;
if (XMLConstants.XML_NS_PREFIX.equals(prefix))
uri = XMLConstants.XML_NS_URI;
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
uri = XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
return uri;
}
public Iterator getPrefixes(String uri)
{
return null;
}
public String getUri(int i)
{
ElementBinding eltBinding = _stack[_stackTop - 1];
if (eltBinding != null) {
return eltBinding.getOldBindingList().get(i).getNewUri();
}
else
return null;
}
public String getPrefix(int i)
{
ElementBinding eltBinding = _stack[_stackTop - 1];
if (eltBinding != null) {
return eltBinding.getOldBindingList().get(i).getPrefix();
}
return null;
}
public int getNumDecls()
{
ElementBinding eltBinding = _stack[_stackTop - 1];
if (eltBinding != null)
return eltBinding.getOldBindingList().size();
else
return 0;
}
NamespaceBinding getElementNamespace(String prefix)
{
NamespaceBinding binding;
if (prefix == null)
binding = _nullEltBinding;
else
binding = _bindings.get(prefix);
if (binding != null)
return binding;
else {
binding = new NamespaceBinding(prefix, null, _version);
_bindings.put(prefix, binding);
return binding;
}
}
NamespaceBinding getAttributeNamespace(String prefix)
{
NamespaceBinding binding;
if (prefix == null)
binding = _nullAttrBinding;
else
binding = _bindings.get(prefix);
if (binding != null)
return binding;
else {
binding = new NamespaceBinding(prefix, null, _version);
_bindings.put(prefix, binding);
return binding;
}
}
static class ElementBinding
{
private SaxIntern.Entry _name;
private ArrayList<Decl> _declList;
public void setName(SaxIntern.Entry name)
{
_name = name;
}
public SaxIntern.Entry getName()
{
return _name;
}
public void addOldBinding(NamespaceBinding binding, String prefix,
String oldUri, String newUri)
{
if (_declList == null)
_declList = new ArrayList<Decl>();
_declList.add(new Decl(binding, prefix, oldUri, newUri));
}
public ArrayList<Decl> getOldBindingList()
{
return _declList;
}
public void clear()
{
_declList = null;
}
}
static class Decl {
private final NamespaceBinding _binding;
private final String _prefix;
private final String _oldUri;
private final String _newUri;
Decl(NamespaceBinding binding, String prefix,
String oldUri, String newUri)
{
_binding = binding;
_prefix = prefix;
_oldUri = oldUri;
_newUri = newUri;
}
NamespaceBinding getBinding()
{
return _binding;
}
String getPrefix()
{
return _prefix;
}
String getOldUri()
{
return _oldUri;
}
String getNewUri()
{
return _newUri;
}
}
}