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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.tuscany.sca.assembly.xml;

import java.util.HashMap;
import java.util.Map;

import javax.xml.namespace.QName;

import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.Import;
import org.apache.tuscany.sca.contribution.namespace.NamespaceImport;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.apache.tuscany.sca.monitor.Monitor;

/**
 * A Model Resolver for Composite models.
 *
 * @version $Rev: 831239 $ $Date: 2009-10-30 11:39:59 +0200 (Fri, 30 Oct 2009) $
 */
public class CompositeModelResolver implements ModelResolver {

    private Contribution contribution;
    private Map map = new HashMap();

    public CompositeModelResolver(Contribution contribution, FactoryExtensionPoint modelFactories) {
        this.contribution = contribution;
    }

    public void addModel(Object resolved, ProcessorContext context) {
        Composite composite = (Composite)resolved;
        Composite old = map.put(composite.getName(), composite);
        if (old != null) {
            Monitor.error(context.getMonitor(),
                          this,
                          Messages.RESOURCE_BUNDLE,
                          "DuplicateCompositeName",
                          composite.getName().toString(),
                          contribution.getLocation());
        }
    }

    public Object removeModel(Object resolved, ProcessorContext context) {
        return map.remove(((Composite)resolved).getName());
    }

    public  T resolveModel(Class modelClass, T unresolved, ProcessorContext context) {

        // Lookup a definition for the given namespace
        QName qname = ((Composite)unresolved).getName();
        Composite resolved = null;
        
        // Delegate the resolution to the imports
        for (Import import_ : this.contribution.getImports()) {
            if (import_ instanceof NamespaceImport) {
                NamespaceImport namespaceImport = (NamespaceImport)import_;
                if (namespaceImport.getNamespace().equals(qname.getNamespaceURI())) {

                    // Delegate the resolution to the import resolver
                    resolved = namespaceImport.getModelResolver().resolveModel(Composite.class, (Composite)unresolved, context);
                    if (!resolved.isUnresolved()) {
                        return modelClass.cast(resolved);
                    }
                }
            }
        }
        
        // No definition found, search within the current contribution
        resolved = (Composite) map.get(qname);
        if (resolved != null) {
            return modelClass.cast(resolved);
        }
        
        return (T)unresolved;
    }
}