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/*******************************************************************************
* Copyright (c) 2002, 2005 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.ui.internal.catalog;
import java.io.InputStream;
import java.net.URL;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
*
*/
public class XMLQuickScan
{
public static String getTargetNamespaceURIForSchema(String uri)
{
String result = null;
try
{
URL url = new URL(uri);
InputStream inputStream = url.openStream();
result = XMLQuickScan.getTargetNamespaceURIForSchema(inputStream);
}
catch (Exception e)
{
}
return result;
}
public static String getTargetNamespaceURIForSchema(InputStream input)
{
TargetNamespaceURIContentHandler handler = new TargetNamespaceURIContentHandler();
ClassLoader prevClassLoader = Thread.currentThread().getContextClassLoader();
try
{
Thread.currentThread().setContextClassLoader(XMLQuickScan.class.getClassLoader());
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
SAXParser parser = factory.newSAXParser();
parser.parse(new InputSource(input), handler);
}
catch (Exception e)
{
}
finally
{
Thread.currentThread().setContextClassLoader(prevClassLoader);
}
return handler.targetNamespaceURI;
}
protected static class TargetNamespaceURIContentHandler extends DefaultHandler
{
public String targetNamespaceURI;
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException
{
if (localName.equals("schema")) //$NON-NLS-1$
{
int nAttributes = attributes.getLength();
for (int i = 0; i < nAttributes; i++)
{
if (attributes.getLocalName(i).equals("targetNamespace")) //$NON-NLS-1$
{
targetNamespaceURI = attributes.getValue(i);
break;
}
}
}
// todo there's a nice way to do this I'm sure
// here I intentially cause an exception...
String x = null;
x.length();
}
}
}
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