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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.spi.contribution.xml;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

import org.fabric3.api.host.Fabric3Exception;
import org.fabric3.spi.contribution.Resource;
import org.fabric3.spi.introspection.IntrospectionContext;

/**
 * A registry of XmlResourceElementLoaders
 */
public interface XmlResourceElementLoaderRegistry {
    /**
     * Register a XmlResourceElementLoader using the processor's QName type as the key
     *
     * @param indexer the indexer to register
     */
    void register(XmlResourceElementLoader indexer);

    /**
     * Unregister an XmlResourceElementLoader for a QName
     *
     * @param name the QName
     */
    void unregister(QName name);

    /**
     * Dispatches to an XmlResourceElementLoader to loads an element in an XML resource
     *
     * @param reader   the StAX reader, positioned at the start of the element to laod
     * @param resource the resource
     * @param context  the context to which validation errors and warnings are reported
     * @throws Fabric3Exception   if a fatal error loading the resource occurs
     * @throws Fabric3Exception if an error parsing the XML stream occurs
     */
    void load(XMLStreamReader reader, Resource resource, IntrospectionContext context) throws Fabric3Exception, XMLStreamException;

}