/*
 * 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.domain.model.xml;

import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;

import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Callback;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.ComponentProperty;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.assembly.ComponentService;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.assembly.CompositeReference;
import org.apache.tuscany.sca.assembly.CompositeService;
import org.apache.tuscany.sca.assembly.ConfiguredOperation;
import org.apache.tuscany.sca.assembly.ConstrainingType;
import org.apache.tuscany.sca.assembly.Contract;
import org.apache.tuscany.sca.assembly.Implementation;
import org.apache.tuscany.sca.assembly.OperationsConfigurator;
import org.apache.tuscany.sca.assembly.Property;
import org.apache.tuscany.sca.assembly.Reference;
import org.apache.tuscany.sca.assembly.Service;
import org.apache.tuscany.sca.assembly.Wire;
import org.apache.tuscany.sca.contribution.Artifact;
import org.apache.tuscany.sca.contribution.ContributionFactory;
import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.contribution.service.ContributionReadException;
import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
import org.apache.tuscany.sca.contribution.service.ContributionWriteException;
import org.apache.tuscany.sca.domain.model.Contribution;
import org.apache.tuscany.sca.domain.model.Domain;
import org.apache.tuscany.sca.domain.model.DomainFactory;
import org.apache.tuscany.sca.domain.model.Node;
import org.apache.tuscany.sca.domain.model.impl.DomainlFactoryImpl;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
import org.apache.tuscany.sca.policy.Intent;
import org.apache.tuscany.sca.policy.IntentAttachPointType;
import org.apache.tuscany.sca.policy.PolicyFactory;
import org.apache.tuscany.sca.policy.PolicySet;
import org.apache.tuscany.sca.policy.PolicySetAttachPoint;
import org.w3c.dom.Document;

/**
 * A domain processor. 
 * 
 * @version $Rev: 615632 $ $Date: 2008-01-27 19:14:25 +0000 (Sun, 27 Jan 2008) $
 */
public class DomainProcessor extends BaseStAXArtifactProcessor implements Constants, StAXArtifactProcessor<Domain> {
    
    DomainFactory domainFactory;

    /**
     * Construct a new domain processor
     * 
     * @param extensionProcessor
     */
    public DomainProcessor(StAXArtifactProcessor extensionProcessor) {
        domainFactory = new DomainlFactoryImpl();
    }

    /**
     * Read and XML stream and Construct a new domain
     * 
     * @param reader the input XML stream
     */

    public Domain read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException {
        Domain domain = null;
        Node  node = null;
        Contribution contribution = null;
        
        QName name;

        // Read the composite document
        while (reader.hasNext()) {
            int event = reader.getEventType();
            switch (event) {
                case START_ELEMENT:
                    name = reader.getName();

                    if (DOMAIN_QNAME.equals(name)) {

                        // Read a <domain>
                        domain = domainFactory.createDomain();
                        domain.setDomainURI(getString(reader, org.apache.tuscany.sca.assembly.xml.Constants.URI));

                    } else if (NODE_QNAME.equals(name)) {

                        // Read a <node>
                        node = domainFactory.createNode();
                        node.setNodeURI(getString(reader, org.apache.tuscany.sca.assembly.xml.Constants.URI));
                        domain.getNodes().add(node);

                    } else if (COMPOSITE_QNAME.equals(name)) {
                        
                        // Read a <composite>
                        QName compositeQName = getQName(reader, org.apache.tuscany.sca.assembly.xml.Constants.NAME);
                        node.setCompositeName(compositeQName);
                    } else if (CONTRIBUTION_QNAME.equals(name)) {

                        // Read a <contribution>
                        contribution = domainFactory.createContribution();
                        contribution.setContributionName(getString(reader, org.apache.tuscany.sca.assembly.xml.Constants.NAME));
                        domain.getContributions().add(contribution);
                    }
                        
                    break;

                case XMLStreamConstants.CHARACTERS:
                    break;

                case END_ELEMENT:
                    name = reader.getName();

                    // Clear current state when reading  end element
                    if (NODE_QNAME.equals(name)) {
                        node = null;
                    } else if (CONTRIBUTION_QNAME.equals(name)) {
                        contribution = null;
                    }
                    break;
            }

            // Read the next element
            if (reader.hasNext()) {
                reader.next();
            }
        }
        return domain;
    }

    public void write(Domain domain, XMLStreamWriter writer) throws ContributionWriteException, XMLStreamException {

    }

    public void resolve(Domain domain, ModelResolver resolver) throws ContributionResolveException {


    }    
    
    public QName getArtifactType() {
        return DOMAIN_QNAME;
    }

    public Class<Domain> getModelType() {
        return Domain.class;
    }
}