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/*******************************************************************************
* Copyright (c) 2002, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.xml.core.internal.contentmodel.util;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* DOMNamespaceInfoManager
*
*
*/
public class DOMNamespaceInfoManager
{
public static final String XSI_URI = "http://www.w3.org/2001/XMLSchema-instance"; //$NON-NLS-1$
public DOMNamespaceInfoManager()
{
}
public List getNamespaceInfoList(Element element)
{
NamespaceInfoReader reader = new NamespaceInfoReader();
return reader.getNamespaceInfoList(element);
}
public void removeNamespaceInfo(Element element)
{
NamespaceInfoRemover remover = new NamespaceInfoRemover();
remover.removeNamespaceInfo(element);
}
public void addNamespaceInfo(Element element, List namespaceInfoList, boolean needsXSI)
{
// first we create an xmlns attribute for each namespace
//
Document document = element.getOwnerDocument();
String schemaLocationValue = ""; //$NON-NLS-1$
for (Iterator iterator = namespaceInfoList.iterator(); iterator.hasNext(); )
{
NamespaceInfo nsInfo = (NamespaceInfo)iterator.next();
nsInfo.normalize();
if (nsInfo.uri != null)
{
String attrName = nsInfo.prefix != null ? "xmlns:" + nsInfo.prefix : "xmlns"; //$NON-NLS-1$ //$NON-NLS-2$
Attr namespaceAttr = document.createAttribute(attrName);
namespaceAttr.setValue(nsInfo.uri);
element.setAttributeNode(namespaceAttr);
// in this case we use the attribute "xsi:schemaLocation"
// here we build up its value
//
if (nsInfo.locationHint != null)
{
schemaLocationValue += nsInfo.uri;
schemaLocationValue += " "; //$NON-NLS-1$
schemaLocationValue += nsInfo.locationHint;
schemaLocationValue += " "; //$NON-NLS-1$
}
if (nsInfo.uri.equals(XSI_URI))
{
needsXSI = false;
}
}
else if (nsInfo.locationHint != null)
{
// in this case we use the attribute "xsi:noNamespaceSchemaLocation"
//
Attr attr = document.createAttribute("xsi:noNamespaceSchemaLocation"); //$NON-NLS-1$
attr.setValue(nsInfo.locationHint);
element.setAttributeNode(attr);
}
}
if (needsXSI)
{
// we add an xmlns:xsi attribute to define 'xsi:schemaLocation' attribute
//
Attr attr = document.createAttribute("xmlns:xsi"); //$NON-NLS-1$
attr.setValue(XSI_URI);
element.setAttributeNode(attr);
}
if (schemaLocationValue.length() > 0)
{
// create the "xsi:schemaLocation" attribute
//
Attr attr = document.createAttribute("xsi:schemaLocation"); //$NON-NLS-1$
attr.setValue(schemaLocationValue);
element.setAttributeNode(attr);
}
}
/**
*
*/
protected static class NamespaceInfoReader extends NamespaceAttributeVisitor
{
protected List namespaceInfoList = new Vector();
public List getNamespaceInfoList(Element element)
{
visitElement(element);
return namespaceInfoList;
}
public void visitXSINoNamespaceSchemaLocationAttribute(Attr attr, String value)
{
NamespaceInfo info = createNamespaceInfo();
info.locationHint = value;
}
public void visitXMLNamespaceAttribute(Attr attr, String prefix, String uri)
{
NamespaceInfo info = createNamespaceInfo();
info.uri = uri;
info.prefix = prefix;
super.visitXMLNamespaceAttribute(attr, prefix, uri);
}
public void visitXSISchemaLocationValuePair(String uri, String locationHint)
{
NamespaceInfo info = getNamespaceInfoForURI(uri);
if (info != null)
{
info.locationHint = locationHint;
}
else
{
info = createNamespaceInfo();
info.uri = uri;
info.locationHint = locationHint;
}
}
protected NamespaceInfo getNamespaceInfoForURI(String uri)
{
NamespaceInfo result = null;
for (Iterator i = namespaceInfoList.iterator(); i.hasNext(); )
{
NamespaceInfo info = (NamespaceInfo)i.next();
if (info.uri != null && info.uri.equals(uri))
{
result = info;
break;
}
}
return result;
}
protected NamespaceInfo createNamespaceInfo()
{
NamespaceInfo info = new NamespaceInfo();
namespaceInfoList.add(info);
return info;
}
}
/**
*
*/
protected static class NamespaceInfoRemover extends NamespaceAttributeVisitor
{
protected List attributesToRemove = new Vector();
public void removeNamespaceInfo(Element element)
{
visitElement(element);
removeAttributes();
}
public void visitXSINoNamespaceSchemaLocationAttribute(Attr attr, String value)
{
attributesToRemove.add(attr);
}
public void visitXMLNamespaceAttribute(Attr attr, String namespacePrefix, String namespaceURI)
{
attributesToRemove.add(attr);
super.visitXMLNamespaceAttribute(attr, namespacePrefix, namespaceURI);
}
public void visitXSISchemaLocationAttribute(Attr attr, String value)
{
attributesToRemove.add(attr);
}
public void removeAttributes()
{
for (Iterator i = attributesToRemove.iterator(); i.hasNext(); )
{
Attr attr = (Attr)i.next();
Element element = attr.getOwnerElement();
if (element != null)
{
element.removeAttributeNode(attr);
}
}
}
}
}
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