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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.contribution.processor;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.util.HashMap;
import java.util.Map;

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

/**
 * Default implementation of an XmlIndexerRegistry.
 */
public class XmlResourceElementLoaderRegistryImpl implements XmlResourceElementLoaderRegistry {
    private Map cache = new HashMap<>();

    public void register(XmlResourceElementLoader loader) {
        cache.put(loader.getType(), loader);
    }

    public void unregister(QName name) {
        cache.remove(name);
    }

    @SuppressWarnings({"unchecked"})
    public void load(XMLStreamReader reader, Resource resource, IntrospectionContext context) throws Fabric3Exception, XMLStreamException {
        try {
            QName name = reader.getName();
            XmlResourceElementLoader elementLoader = cache.get(name);
            if (elementLoader == null) {
                return;
            }
            elementLoader.load(reader, resource, context);
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (XMLStreamException e) {
                e.printStackTrace();
            }
        }

    }
}