modules/contribution-resource/src/main/java/org/apache/tuscany/sca/contribution/resource/impl/ResourceExportModelResolver.java

/*
 * 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.contribution.resource.impl;

import org.apache.tuscany.sca.contribution.Artifact;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.contribution.resource.ResourceExport;

/**
 * A model resolver for resource exports.
 *
 * @version $Rev$ $Date$
 */
public class ResourceExportModelResolver implements ModelResolver {

    private ResourceExport export;
    private ModelResolver resolver;

    public ResourceExportModelResolver(ResourceExport export, ModelResolver resolver) {
        this.export = export;
        this.resolver = resolver;
    }

    public void addModel(Object resolved, ProcessorContext context) {
        throw new IllegalStateException();
    }

    public Object removeModel(Object resolved, ProcessorContext context) {
        throw new IllegalStateException();
    }

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

        // Filter based on the artifact URI
        Artifact artifact = (Artifact)unresolved;
        if (export.getURI().equals(artifact.getURI())) {

            // The artifact URI matches the exported URI, delegate to the
            // contribution's resolver
            return resolver.resolveModel(modelClass, unresolved, context);
        } else {

            // The artifact URI is not exported, return the unresolved object
            return unresolved;
        }
    }

}