/*******************************************************************************
* 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 - Initial API and implementation
*******************************************************************************/
package org.eclipse.wst.wsi.internal.core.wsdl.xsd;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;
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;
/**
* Handle a chain of entity resolvers.
*
* @author Lawrence Mandel (lmandel@ca.ibm.com)
*/
public class XMLEntityResolverChain implements XMLEntityResolver
{
private List entityResolvers = new Vector();
/**
* @see org.apache.xerces.xni.parser.XMLEntityResolver#resolveEntity(org.apache.xerces.xni.XMLResourceIdentifier)
*/
public XMLInputSource resolveEntity(XMLResourceIdentifier xmlResourceIdentifier) throws XNIException, IOException
{
XMLInputSource is = null;
Iterator entityResolverIter = entityResolvers.iterator();
while (entityResolverIter.hasNext())
{
XMLEntityResolver entityResolver = (XMLEntityResolver)entityResolverIter.next();
try
{
is = entityResolver.resolveEntity(xmlResourceIdentifier);
}
catch (XNIException e)
{
}
catch (IOException e)
{
}
if (is != null)
{
break;
}
}
// Throw and IOException if the file isn't found
if (is == null)
{
throw new IOException("Unable to locate file");
}
return is;
}
/**
* Add an entity resolver to this chain.
*
* @param entityResolver The resolver to add to the chain.
*/
public void addEntityResolver(XMLEntityResolver entityResolver)
{
entityResolvers.add(entityResolver);
}
}