/*******************************************************************************
* Copyright (c) 2001, 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
*******************************************************************************/
package org.eclipse.wst.wsdl.validation.internal.xml;
import java.io.IOException;
import org.apache.xerces.xni.XMLResourceIdentifier;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLEntityResolver;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.eclipse.wst.wsdl.validation.internal.util.LazyURLInputStream;
/**
* A resolver to resolver entities from the XML catalog.
*/
public class XMLCatalogResolver implements XMLEntityResolver
{
protected static XMLCatalogResolver xmlCatalog;
/**
* Constructor.
*/
protected XMLCatalogResolver()
{
}
/**
* Get the instance of this resolver.
*
* @return the instance of this resolver
*/
public static XMLCatalogResolver getInstance()
{
if (xmlCatalog == null)
{
xmlCatalog = new XMLCatalogResolver();
}
return xmlCatalog;
}
/**
* @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)
*/
public XMLInputSource resolveEntity(XMLResourceIdentifier resourceIdentifier) throws XNIException, IOException
{
String publicId = resourceIdentifier.getPublicId();
if(publicId == null)
{
publicId = resourceIdentifier.getNamespace();
}
String systemId = resourceIdentifier.getLiteralSystemId();
String location = XMLCatalog.getInstance().resolveEntityLocation(publicId, systemId);
if (location != null)
{
LazyURLInputStream is = new LazyURLInputStream(location);
XMLInputSource inputSource = new XMLInputSource(publicId, systemId, systemId, is, null);
return inputSource;
}
// otherwise return null to tell the parser to locate the systemId as a URI
return null;
}
}