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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.interfacedef.relaxws;

import static org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLModelResolver.XSD_QNAME_LIST;

import java.net.URI;
import java.util.List;

import javax.wsdl.Definition;
import javax.wsdl.Types;
import javax.wsdl.extensions.ExtensibilityElement;
import javax.wsdl.extensions.UnknownExtensibilityElement;
import javax.wsdl.extensions.schema.Schema;

import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.interfacedef.wsdl.WSDLDefinition;
import org.apache.tuscany.sca.interfacedef.wsdl.WSDLFactory;
import org.apache.tuscany.sca.interfacedef.wsdl.XSDefinition;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * A ModelResolver that takes a RelaxWSModel object and gives the 
 * underlying WSDLDefinition to the WSDL model resolver.  
 */
public class RelaxWSModelResolver implements ModelResolver {
    
    private ModelResolver modelresolver;
    Contribution contribution;
    private WSDLFactory wsdlFactory;

    public RelaxWSModelResolver(Contribution contribution, ModelFactoryExtensionPoint modelFactories) {
        modelresolver = contribution.getModelResolver();
        this.contribution = contribution;
        this.wsdlFactory = modelFactories.getFactory(WSDLFactory.class);
    }

    public void addModel(Object arg0) {
        RelaxWSModel rwsModel = (RelaxWSModel)arg0;
        readInlineSchemas(rwsModel.wsdlDefinition, rwsModel.wsdlDefinition.getDefinition());
        modelresolver.addModel(rwsModel.wsdlDefinition);
    }

    public Object removeModel(Object arg0) {
        RelaxWSModel rwsModel = (RelaxWSModel)arg0;
        return modelresolver.removeModel(rwsModel.wsdlDefinition);
    }

    public <T> T resolveModel(Class<T> arg0, T arg1) {
        // nothing needed for RelaxWSModelResolver
        return null;
    }

    // TODO following methods are a direct copy from the WSDLModelResolver
    //      need to refactor so the code can be shared 

    protected void readInlineSchemas(WSDLDefinition wsdlDefinition, Definition definition) {
        if (contribution == null) {
            // Check null for test cases
            return;
        }
        Types types = definition.getTypes();
        if (types != null) {
            int index = 0;
            for (Object ext : types.getExtensibilityElements()) {
                ExtensibilityElement extElement = (ExtensibilityElement)ext;
                Element element = null;
                if (XSD_QNAME_LIST.contains(extElement.getElementType())) {
                    if (extElement instanceof Schema) {
                        element = ((Schema)extElement).getElement();
                    } else if (extElement instanceof UnknownExtensibilityElement) {
                        element = ((UnknownExtensibilityElement)extElement).getElement();
                    }
                }
                if (element != null) {
                    Document doc = promote(element);
                    XSDefinition xsDefinition = wsdlFactory.createXSDefinition();
                    xsDefinition.setUnresolved(true);
                    xsDefinition.setNamespace(element.getAttribute("targetNamespace"));
                    xsDefinition.setDocument(doc);
                    xsDefinition.setLocation(URI.create(doc.getDocumentURI() + "#" + index));
                    XSDefinition resolved =
                        contribution.getModelResolver().resolveModel(XSDefinition.class, xsDefinition);
                    if (resolved != null && !resolved.isUnresolved()) {
                        if (!wsdlDefinition.getXmlSchemas().contains(resolved)) {
                            wsdlDefinition.getXmlSchemas().add(xsDefinition);
                        }
                    }
                    index++;
                }
            }
        }
        for (Object imports : definition.getImports().values()) {
            List impList = (List)imports;
            for (Object i : impList) {
                javax.wsdl.Import anImport = (javax.wsdl.Import)i;
                // Read inline schemas 
                if (anImport.getDefinition() != null) {
                    readInlineSchemas(wsdlDefinition, anImport.getDefinition());
                }
            }
        }
    }

    private Document promote(Element element) {
        Document doc = (Document)element.getOwnerDocument().cloneNode(false);
        Element schema = (Element)doc.importNode(element, true);
        doc.appendChild(schema);
        Node parent = element.getParentNode();
        while (parent instanceof Element) {
            Element root = (Element)parent;
            NamedNodeMap nodeMap = root.getAttributes();
            for (int i = 0; i < nodeMap.getLength(); i++) {
                Attr attr = (Attr)nodeMap.item(i);
                String name = attr.getName();
                if ("xmlns".equals(name) || name.startsWith("xmlns:")) {
                    if (schema.getAttributeNode(name) == null) {
                        schema.setAttributeNodeNS((Attr)doc.importNode(attr, true));
                    }
                }
            }
            parent = parent.getParentNode();
        }
        doc.setDocumentURI(element.getOwnerDocument().getDocumentURI());
        return doc;
    }

}