| /******************************************************************************* |
| * 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.ui.internal.catalog; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| |
| import javax.xml.parsers.ParserConfigurationException; |
| import javax.xml.parsers.SAXParser; |
| import javax.xml.parsers.SAXParserFactory; |
| |
| import org.eclipse.wst.xml.ui.internal.Logger; |
| 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 (StopParseException e) { |
| // this is a normal exception to stop parsing early, |
| // when info is found, so we can safely ignore |
| } |
| catch (ParserConfigurationException e) { |
| Logger.logException(e); |
| } |
| catch (SAXException e) { |
| Logger.logException(e); |
| } |
| catch (IOException e) { |
| Logger.logException(e); |
| } |
| finally { |
| Thread.currentThread().setContextClassLoader(prevClassLoader); |
| } |
| return handler.targetNamespaceURI; |
| } |
| |
| /** |
| * This is a special exception that is used to stop parsing when required |
| * information is found. |
| */ |
| static class StopParseException extends org.xml.sax.SAXException { |
| static final long serialVersionUID = 1L; |
| |
| /** |
| * Constructor StopParseException. |
| */ |
| StopParseException() { |
| super("targetnamespace found, no need to continue the parse"); |
| } |
| } |
| |
| 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; |
| } |
| } |
| } |
| throw new StopParseException(); |
| } |
| } |
| } |