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/**
 * SCA4J
 * Copyright (c) 2009 - 2099 Service Symphony Ltd
 *
 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
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 * is included in this distrubtion or you may obtain a copy at
 *
 *    http://www.opensource.org/licenses/apache2.0.php
 *
 * 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.
 *
 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
 *
 *
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 *
 * Copyright (c) 2007 - 2008 fabric3 project contributors
 *
 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  A copy of the license
 * is included in this distrubtion or you may obtain a copy at
 *
 *    http://www.opensource.org/licenses/apache2.0.php
 *
 * 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.
 *
 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
 *
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 *
 * Copyright (c) 2005 - 2006 The Apache Software Foundation
 *
 * Apache Tuscany is an effort undergoing incubation at The Apache Software
 * Foundation (ASF), sponsored by the Apache Web Services PMC. Incubation is
 * required of all newly accepted projects until a further review indicates that
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package org.sca4j.loader.composite;

import java.net.URI;

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

import org.oasisopen.sca.annotation.Reference;
import org.sca4j.introspection.IntrospectionContext;
import org.sca4j.introspection.xml.LoaderHelper;
import org.sca4j.introspection.xml.LoaderUtil;
import org.sca4j.introspection.xml.TypeLoader;
import org.sca4j.introspection.xml.UnrecognizedAttribute;
import org.sca4j.scdl.WireDefinition;

/**
 * @version $Rev: 5134 $ $Date: 2008-08-02 07:33:02 +0100 (Sat, 02 Aug 2008) $
 */
public class WireLoader implements TypeLoader {
    private final LoaderHelper helper;

    public WireLoader(@Reference LoaderHelper helper) {
        this.helper = helper;
    }

    public WireDefinition load(XMLStreamReader reader, IntrospectionContext context) throws XMLStreamException {
        validateAttributes(reader, context);

        String source = reader.getAttributeValue(null, "source");
        String target = reader.getAttributeValue(null, "target");
        LoaderUtil.skipToEndElement(reader);

        URI sourceURI = helper.getURI(source);
        URI targetURI = helper.getURI(target);
        return new WireDefinition(sourceURI, targetURI);
    }

    private void validateAttributes(XMLStreamReader reader, IntrospectionContext context) {
        for (int i = 0; i < reader.getAttributeCount(); i++) {
            String name = reader.getAttributeLocalName(i);
            if (!"source".equals(name) && !"target".equals(name) && !"requires".equals(name)) {
                context.addError(new UnrecognizedAttribute(name, reader));
            }
        }
    }

}