/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
*/
package org.exolab.castor.xml.schema;
import java.util.Hashtable;
/**
* An implementation of Resolver that can be "scoped". Which means you
* can construct a ScopableResovler and give it another Resolver (which
* can also be Scopable). If this Resolver cannot "resolve" the id, then
* it will try to use the given Resolver to resolver it.
* @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
* @version $Revision$ $Date: 2006-04-13 06:47:36 -0600 (Thu, 13 Apr 2006) $
**/
public class ScopableResolver implements Resolver {
private Hashtable ids;
private Resolver _resolver = null;
public ScopableResolver() {
ids = new Hashtable();
} //-- ScopableResolver
public ScopableResolver(Resolver resolver) {
this();
_resolver = resolver;
} //-- ScopableResolver
/**
* Adds a resolvable object to this resolver identified by <tt>id</tt>.
* Subsequent calls to {@link #resolve} with the same <tt>id</tt>
* will return <tt>referent</tt>.
*
* @param id The referent's identifier
* @param referent The referent object
*/
public void addResolvable( String id, Referable referent ) {
if (ids.get(id) != null) {
//-- handle error
}
ids.put(id, referent);
} //-- register
/**
* Removes a resolvable object from this resolver. Subsequent calls
* to {@link #resolve} with the same <tt>id</tt> will return null.
*
* @param id The referent's identifier
*/
public void removeResolvable( String id ) {
Object obj = ids.get(id);
if (obj != null) {
ids.remove(id);
}
} //-- removeResolvable
public Referable resolve(String id) {
Referable referable = (Referable) ids.get(id);
if ((referable == null) && (_resolver != null)) {
referable = _resolver.resolve(id);
}
return referable;
} //-- resolve
} //-- ScopableResolver