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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
 * 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.
 *
 *
 * Original Codehaus Header
 *
 * 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.
 *
 * Original Apache Header
 *
 * 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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 * status is not necessarily a reflection of the completeness or stability of the
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 * This product includes software developed by
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 */
package org.sca4j.loader.common;

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

import org.oasisopen.sca.annotation.EagerInit;
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.MissingAttribute;
import org.sca4j.introspection.xml.TypeLoader;
import org.sca4j.introspection.xml.UnrecognizedAttribute;
import org.sca4j.scdl.OperationDefinition;

/**
 * Loads an operation definition from the SCDL.
 *
 * @version $Rev: 1980 $ $Date: 2007-11-13 17:31:55 +0000 (Tue, 13 Nov 2007) $
 */
@EagerInit
public class OperationLoader implements TypeLoader {

    private final LoaderHelper loaderHelper;

    public OperationLoader(@Reference LoaderHelper loaderHelper) {
        this.loaderHelper = loaderHelper;
    }

    public OperationDefinition load(XMLStreamReader reader, IntrospectionContext context) throws XMLStreamException {
        validateAttributes(reader, context);
        OperationDefinition operationDefinition = new OperationDefinition();
        String name = reader.getAttributeValue(null, "name");
        if (name == null) {
            MissingAttribute failure = new MissingAttribute("Operation name not specified", "name", reader);
            context.addError(failure);
        }
        operationDefinition.setName(name);

        loaderHelper.loadPolicySetsAndIntents(operationDefinition, reader, context);

        LoaderUtil.skipToEndElement(reader);

        return operationDefinition;

    }

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


}