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/*
 * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.ws.client;

import com.sun.istack.NotNull;
import com.sun.istack.Nullable;
import com.sun.xml.ws.Closeable;
import com.sun.xml.ws.api.BindingID;
import com.sun.xml.ws.api.ComponentFeature;
import com.sun.xml.ws.api.ComponentsFeature;
import com.sun.xml.ws.api.ComponentFeature.Target;
import com.sun.xml.ws.api.EndpointAddress;
import com.sun.xml.ws.api.WSService;
import com.sun.xml.ws.api.addressing.WSEndpointReference;
import com.sun.xml.ws.api.client.ServiceInterceptor;
import com.sun.xml.ws.api.client.ServiceInterceptorFactory;
import com.sun.xml.ws.api.databinding.DatabindingConfig;
import com.sun.xml.ws.api.databinding.DatabindingFactory;
import com.sun.xml.ws.api.databinding.MetadataReader;
import com.sun.xml.ws.api.model.SEIModel;
import com.sun.xml.ws.api.model.wsdl.WSDLModel;
import com.sun.xml.ws.api.model.wsdl.WSDLPort;
import com.sun.xml.ws.api.model.wsdl.WSDLService;
import com.sun.xml.ws.api.pipe.Stubs;
import com.sun.xml.ws.api.server.Container;
import com.sun.xml.ws.api.server.ContainerResolver;
import com.sun.xml.ws.api.wsdl.parser.WSDLParserExtension;
import com.sun.xml.ws.binding.BindingImpl;
import com.sun.xml.ws.binding.WebServiceFeatureList;
import com.sun.xml.ws.client.HandlerConfigurator.AnnotationConfigurator;
import com.sun.xml.ws.client.HandlerConfigurator.HandlerResolverImpl;
import com.sun.xml.ws.client.sei.SEIStub;
import com.sun.xml.ws.developer.MemberSubmissionAddressingFeature;
import com.sun.xml.ws.developer.UsesJAXBContextFeature;
import com.sun.xml.ws.developer.WSBindingProvider;
import com.sun.xml.ws.model.RuntimeModeler;
import com.sun.xml.ws.model.SOAPSEIModel;
import com.sun.xml.ws.model.wsdl.WSDLPortImpl;
import com.sun.xml.ws.resources.ClientMessages;
import com.sun.xml.ws.resources.DispatchMessages;
import com.sun.xml.ws.resources.ProviderApiMessages;
import com.sun.xml.ws.util.JAXWSUtils;
import com.sun.xml.ws.util.ServiceConfigurationError;
import com.sun.xml.ws.util.ServiceFinder;
import com.sun.xml.ws.wsdl.parser.RuntimeWSDLParser;

import org.xml.sax.EntityResolver;
import org.xml.sax.SAXException;

import javax.jws.HandlerChain;
import javax.jws.WebService;
import javax.xml.bind.JAXBContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.ws.BindingProvider;
import javax.xml.ws.Dispatch;
import javax.xml.ws.EndpointReference;
import javax.xml.ws.Service;
import javax.xml.ws.WebServiceClient;
import javax.xml.ws.WebServiceException;
import javax.xml.ws.WebServiceFeature;
import javax.xml.ws.handler.HandlerResolver;
import javax.xml.ws.soap.AddressingFeature;

import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executor;

import static com.sun.xml.ws.util.xml.XmlUtil.createDefaultCatalogResolver;

/**
 * Service objects provide the client view of a Web service.
 *
 * 
Service acts as a factory of the following:
 * 
    
 * 
  • Proxies for a target service endpoint.
 * 
  • Instances of javax.xml.ws.Dispatch for
 * dynamic message-oriented invocation of a remote
 * operation.
 * 
    • 
 * 

 *
 * 
The ports available on a service can be enumerated using the
 * getPorts method. Alternatively, you can pass a
 * service endpoint interface to the unary getPort method
 * and let the runtime select a compatible port.
 *
 * 
Handler chains for all the objects created by a Service
 * can be set by means of the provided HandlerRegistry.
 *
 * 
An Executor may be set on the service in order
 * to gain better control over the threads used to dispatch asynchronous
 * callbacks. For instance, thread pooling with certain parameters
 * can be enabled by creating a ThreadPoolExecutor and
 * registering it with the service.
 *
 * @author WS Development Team
 * @see Executor
 * @since JAX-WS 2.0
 */
public class WSServiceDelegate extends WSService {
    /**
     * All ports.
     * 

     * This includes ports statically known to WSDL, as well as
     * ones that are dynamically added
     * through {@link #addPort(QName, String, String)}.
     * 

     * For statically known ports we'll have {@link SEIPortInfo}.
     * For dynamically added ones we'll have {@link PortInfo}.
     */
    private final Map ports = new HashMap();
    // For monitoring
    protected Map getQNameToPortInfoMap() { return ports; }

    /**
     * Whenever we create {@link BindingProvider}, we use this to configure handlers.
     */
    private @NotNull HandlerConfigurator handlerConfigurator = new HandlerResolverImpl(null);

    private final Class serviceClass;
    
    private final WebServiceFeatureList features;

    /**
     * Name of the service for which this {@link WSServiceDelegate} is created for.
     */
    private final @NotNull QName serviceName;

    /**
     * Information about SEI, keyed by their interface type.
     */
   // private final Map seiContext = new HashMap();
   private final Map seiContext = new HashMap();

    // This executor is used for all the async invocations for all proxies
    // created from this service. But once the proxy is created, then changing
    // this executor doesn't affect the already created proxies.
    private volatile Executor executor;

    /**
     * The WSDL service that this {@link Service} object represents.
     * 

     * This field is null iff no WSDL is given to {@link Service}.
     * This fiels can be be null if the service is created without wsdl but later
     * the epr supplies a wsdl that can be parsed.
     */
    private  @Nullable WSDLService wsdlService;

    private final Container container;
    /**
     * Multiple {@link ServiceInterceptor}s are aggregated into one.
     */
    /*package*/ final @NotNull ServiceInterceptor serviceInterceptor;
    private URL wsdlURL;

    public WSServiceDelegate(URL wsdlDocumentLocation, QName serviceName, Class serviceClass, WebServiceFeature... features) {
        this(wsdlDocumentLocation, serviceName, serviceClass, new WebServiceFeatureList(features));
    }

    protected WSServiceDelegate(URL wsdlDocumentLocation, QName serviceName, Class serviceClass, WebServiceFeatureList features) {
        this(
            wsdlDocumentLocation==null ? null : new StreamSource(wsdlDocumentLocation.toExternalForm()),
            serviceName,serviceClass, features);
        wsdlURL = wsdlDocumentLocation;
    }

    /**
     * @param serviceClass
     *      Either {@link Service}.class or other generated service-derived classes.
     */
    public WSServiceDelegate(@Nullable Source wsdl, @NotNull QName serviceName, @NotNull final Class serviceClass, WebServiceFeature... features) {
    	this(wsdl, serviceName, serviceClass, new WebServiceFeatureList(features));
    }
    
    /**
     * @param serviceClass
     *      Either {@link Service}.class or other generated service-derived classes.
     */
    protected WSServiceDelegate(@Nullable Source wsdl, @NotNull QName serviceName, @NotNull final Class serviceClass, WebServiceFeatureList features) {
        this(wsdl, null, serviceName, serviceClass, features);
    }
    
    /**
     * @param serviceClass
     *      Either {@link Service}.class or other generated service-derived classes.
     */
    public WSServiceDelegate(@Nullable Source wsdl, @Nullable WSDLService service, @NotNull QName serviceName, @NotNull final Class serviceClass, WebServiceFeature... features) {
        this(wsdl, service, serviceName, serviceClass, new WebServiceFeatureList(features));
    }
    
    /**
     * @param serviceClass
     *      Either {@link Service}.class or other generated service-derived classes.
     */
    public WSServiceDelegate(@Nullable Source wsdl, @Nullable WSDLService service, @NotNull QName serviceName, @NotNull final Class serviceClass, WebServiceFeatureList features) {
        //we cant create a Service without serviceName
        if (serviceName == null) {
            throw new WebServiceException(ClientMessages.INVALID_SERVICE_NAME_NULL(null));
        }

        this.features = features;
        
        InitParams initParams = INIT_PARAMS.get();
        INIT_PARAMS.set(null);  // mark it as consumed
        if(initParams==null) {
            initParams = EMPTY_PARAMS;
        }

        this.serviceName = serviceName;
        this.serviceClass = serviceClass;
        Container tContainer = initParams.getContainer()!=null ? initParams.getContainer() : ContainerResolver.getInstance().getContainer();
        if (tContainer == Container.NONE) {
            tContainer = new ClientContainer();
        }
        this.container = tContainer;

        ComponentFeature cf = this.features.get(ComponentFeature.class);
        if (cf != null) {
            switch(cf.getTarget()) {
                case SERVICE:
                    getComponents().add(cf.getComponent());
                    break;
                case CONTAINER:
                    this.container.getComponents().add(cf.getComponent());
                    break;
                default:
                    throw new IllegalArgumentException();
            }
        }
        ComponentsFeature csf = this.features.get(ComponentsFeature.class);
        if (csf != null) {
            for (ComponentFeature cfi : csf.getComponentFeatures()) {
                switch(cfi.getTarget()) {
                    case SERVICE:
                        getComponents().add(cfi.getComponent());
                        break;
                    case CONTAINER:
                        this.container.getComponents().add(cfi.getComponent());
                        break;
                    default:
                        throw new IllegalArgumentException();
                }
            }
        }

        // load interceptor
        ServiceInterceptor interceptor = ServiceInterceptorFactory.load(this, Thread.currentThread().getContextClassLoader());
        ServiceInterceptor si = container.getSPI(ServiceInterceptor.class);
        if (si != null) {
            interceptor = ServiceInterceptor.aggregate(interceptor, si);
        }
        this.serviceInterceptor = interceptor;

        if (service == null) {
	        //if wsdl is null, try and get it from the WebServiceClient.wsdlLocation
	        if(wsdl == null){
	            if(serviceClass != Service.class){
	                WebServiceClient wsClient = AccessController.doPrivileged(new PrivilegedAction() {
	                        public WebServiceClient run() {
	                            return serviceClass.getAnnotation(WebServiceClient.class);
	                        }
	                    });
	                String wsdlLocation = wsClient.wsdlLocation();
	                wsdlLocation = JAXWSUtils.absolutize(JAXWSUtils.getFileOrURLName(wsdlLocation));
	                wsdl = new StreamSource(wsdlLocation);
	            }
	        }
	        if (wsdl != null) {
	            try {
	                URL url = wsdl.getSystemId()==null ? null : JAXWSUtils.getEncodedURL(wsdl.getSystemId());
	                WSDLModel model = parseWSDL(url, wsdl, serviceClass);
	                service = model.getService(this.serviceName);
	                if (service == null)
	                    throw new WebServiceException(
	                        ClientMessages.INVALID_SERVICE_NAME(this.serviceName,
	                            buildNameList(model.getServices().keySet())));
	                // fill in statically known ports
	                for (WSDLPort port : service.getPorts())
	                    ports.put(port.getName(), new PortInfo(this, port));
	            } catch (MalformedURLException e) {
	                throw new WebServiceException(ClientMessages.INVALID_WSDL_URL(wsdl.getSystemId()));
	            }
	        }
        } else {
            // fill in statically known ports
            for (WSDLPort port : service.getPorts())
                ports.put(port.getName(), new PortInfo(this, port));
        }
        this.wsdlService = service;

        if (serviceClass != Service.class) {
            //if @HandlerChain present, set HandlerResolver on service context
            HandlerChain handlerChain =
                    AccessController.doPrivileged(new PrivilegedAction() {
                        public HandlerChain run() {
                            return serviceClass.getAnnotation(HandlerChain.class);
                        }
                    });
            if (handlerChain != null)
                handlerConfigurator = new AnnotationConfigurator(this);
        }

    }

    /**
     * Parses the WSDL and builds {@link com.sun.xml.ws.api.model.wsdl.WSDLModel}.
     * @param wsdlDocumentLocation
     *      Either this or {@code wsdl} parameter must be given.
     *      Null location means the system won't be able to resolve relative references in the WSDL.
     */
    private WSDLModel parseWSDL(URL wsdlDocumentLocation, Source wsdlSource, Class serviceClass) {
        try {
            return RuntimeWSDLParser.parse(wsdlDocumentLocation, wsdlSource, createCatalogResolver(),
                true, getContainer(), serviceClass, ServiceFinder.find(WSDLParserExtension.class).toArray());
        } catch (IOException e) {
            throw new WebServiceException(e);
        } catch (XMLStreamException e) {
            throw new WebServiceException(e);
        } catch (SAXException e) {
            throw new WebServiceException(e);
        } catch (ServiceConfigurationError e) {
            throw new WebServiceException(e);
        }
    }

    protected EntityResolver createCatalogResolver() {
    	return createDefaultCatalogResolver();
    }

    public Executor getExecutor() {
        return executor;
    }

    public void setExecutor(Executor executor) {
        this.executor = executor;
    }

    public HandlerResolver getHandlerResolver() {
        return handlerConfigurator.getResolver();
    }

    /*package*/ final HandlerConfigurator getHandlerConfigurator() {
        return handlerConfigurator;
    }

    public void setHandlerResolver(HandlerResolver resolver) {
        handlerConfigurator = new HandlerResolverImpl(resolver);
    }

    public  T getPort(QName portName, Class portInterface) throws WebServiceException {
        return getPort(portName, portInterface, EMPTY_FEATURES);
    }

    public  T getPort(QName portName, Class portInterface, WebServiceFeature... features) {
        if (portName == null || portInterface == null)
            throw new IllegalArgumentException();
        WSDLService tWsdlService = this.wsdlService;
        if (tWsdlService == null) {
            // assigning it to local variable and not setting it back to this.wsdlService intentionally
            // as we don't want to include the service instance with information gathered from sei
            tWsdlService = getWSDLModelfromSEI(portInterface);
            //still null? throw error need wsdl metadata to create a proxy
            if (tWsdlService == null) {
                throw new WebServiceException(ProviderApiMessages.NO_WSDL_NO_PORT(portInterface.getName()));
            }

        }
        WSDLPort portModel = getPortModel(tWsdlService, portName);
        return getPort(portModel.getEPR(), portName, portInterface, new WebServiceFeatureList(features));
    }

    public  T getPort(EndpointReference epr, Class portInterface, WebServiceFeature... features) {
        return getPort(WSEndpointReference.create(epr),portInterface,features);
    }

    public  T getPort(WSEndpointReference wsepr, Class portInterface, WebServiceFeature... features) {
        //get the portType from SEI, so that it can be used if EPR does n't have endpointName
        WebServiceFeatureList featureList = new WebServiceFeatureList(features);
        QName portTypeName = RuntimeModeler.getPortTypeName(portInterface, getMetadadaReader(featureList, portInterface.getClassLoader()));
        //if port name is not specified in EPR, it will use portTypeName to get it from the WSDL model.
        QName portName = getPortNameFromEPR(wsepr, portTypeName);
        return getPort(wsepr,portName,portInterface, featureList);
    }

    protected  T getPort(WSEndpointReference wsepr, QName portName, Class portInterface,
                          WebServiceFeatureList features) {
        ComponentFeature cf = features.get(ComponentFeature.class);
        if (cf != null && !Target.STUB.equals(cf.getTarget())) {
            throw new IllegalArgumentException();
        }
        ComponentsFeature csf = features.get(ComponentsFeature.class);
        if (csf != null) {
            for (ComponentFeature cfi : csf.getComponentFeatures()) {
                if (!Target.STUB.equals(cfi.getTarget()))
                    throw new IllegalArgumentException();
            }
        }
        features.addAll(this.features);

        SEIPortInfo spi = addSEI(portName, portInterface, features);
        return createEndpointIFBaseProxy(wsepr,portName,portInterface,features, spi);
    }
    
    @Override
    public  T getPort(Class portInterface, WebServiceFeature... features) {
        //get the portType from SEI
        QName portTypeName = RuntimeModeler.getPortTypeName(portInterface, getMetadadaReader(new WebServiceFeatureList(features), portInterface.getClassLoader()));
        WSDLService tmpWsdlService = this.wsdlService;
        if (tmpWsdlService == null) {
            // assigning it to local variable and not setting it back to this.wsdlService intentionally
            // as we don't want to include the service instance with information gathered from sei
            tmpWsdlService = getWSDLModelfromSEI(portInterface);
            //still null? throw error need wsdl metadata to create a proxy
            if(tmpWsdlService == null) {
                throw new WebServiceException(ProviderApiMessages.NO_WSDL_NO_PORT(portInterface.getName()));
            }
        }
        //get the first port corresponding to the SEI
        WSDLPort port = tmpWsdlService.getMatchingPort(portTypeName);
        if (port == null) {
            throw new WebServiceException(ClientMessages.UNDEFINED_PORT_TYPE(portTypeName));
        }
        QName portName = port.getName();
        return getPort(portName, portInterface,features);
    }

    public  T getPort(Class portInterface) throws WebServiceException {
        return getPort(portInterface, EMPTY_FEATURES);
    }
    
    public void addPort(QName portName, String bindingId, String endpointAddress) throws WebServiceException {
        if (!ports.containsKey(portName)) {
            BindingID bid = (bindingId == null) ? BindingID.SOAP11_HTTP : BindingID.parse(bindingId);
            ports.put(portName,
                    new PortInfo(this, (endpointAddress == null) ? null :
                            EndpointAddress.create(endpointAddress), portName, bid));
        } else
            throw new WebServiceException(DispatchMessages.DUPLICATE_PORT(portName.toString()));
    }


    public  Dispatch createDispatch(QName portName, Class  aClass, Service.Mode mode) throws WebServiceException {
        return createDispatch(portName, aClass, mode, EMPTY_FEATURES);
    }

    @Override
    public  Dispatch createDispatch(QName portName, WSEndpointReference wsepr, Class aClass, Service.Mode mode, WebServiceFeature... features) {
    	return createDispatch(portName, wsepr, aClass, mode, new WebServiceFeatureList(features));
    }
    
    public  Dispatch createDispatch(QName portName, WSEndpointReference wsepr, Class aClass, Service.Mode mode, WebServiceFeatureList features) {
        PortInfo port = safeGetPort(portName);
        
        ComponentFeature cf = features.get(ComponentFeature.class);
        if (cf != null && !Target.STUB.equals(cf.getTarget())) {
            throw new IllegalArgumentException();
        }
        ComponentsFeature csf = features.get(ComponentsFeature.class);
        if (csf != null) {
            for (ComponentFeature cfi : csf.getComponentFeatures()) {
                if (!Target.STUB.equals(cfi.getTarget()))
                    throw new IllegalArgumentException();
            }
        }
        features.addAll(this.features);
        
        BindingImpl binding = port.createBinding(features, null, null);
        binding.setMode(mode);
        Dispatch dispatch = Stubs.createDispatch(port, this, binding, aClass, mode, wsepr);
        serviceInterceptor.postCreateDispatch((WSBindingProvider) dispatch);
        return dispatch;
    }

    public  Dispatch createDispatch(QName portName, Class aClass, Service.Mode mode, WebServiceFeature... features) {
    	return createDispatch(portName, aClass, mode, new WebServiceFeatureList(features));
    }
    
    public  Dispatch createDispatch(QName portName, Class aClass, Service.Mode mode, WebServiceFeatureList features) {
        WSEndpointReference wsepr = null;
        boolean isAddressingEnabled = false;
        AddressingFeature af = features.get(AddressingFeature.class);
        if (af == null) {
            af = this.features.get(AddressingFeature.class);
        }
        if (af != null && af.isEnabled())
            isAddressingEnabled = true;
        MemberSubmissionAddressingFeature msa = features.get(MemberSubmissionAddressingFeature.class);
        if (msa == null) {
            msa = this.features.get(MemberSubmissionAddressingFeature.class);
        }
        if (msa != null && msa.isEnabled())
            isAddressingEnabled = true;
        if(isAddressingEnabled && wsdlService != null && wsdlService.get(portName) != null) {
            wsepr = wsdlService.get(portName).getEPR();
        }
        return createDispatch(portName, wsepr, aClass, mode, features);
    }

    public  Dispatch createDispatch(EndpointReference endpointReference, Class type, Service.Mode mode, WebServiceFeature... features) {
        WSEndpointReference wsepr = new WSEndpointReference(endpointReference);
        QName portName = addPortEpr(wsepr);
        return createDispatch(portName, wsepr, type, mode, features);
    }

    /**
     * Obtains {@link PortInfo} for the given name, with error check.
     */
    public
    @NotNull
    PortInfo safeGetPort(QName portName) {
        PortInfo port = ports.get(portName);
        if (port == null) {
            throw new WebServiceException(ClientMessages.INVALID_PORT_NAME(portName, buildNameList(ports.keySet())));
        }
        return port;
    }

    private StringBuilder buildNameList(Collection names) {
        StringBuilder sb = new StringBuilder();
        for (QName qn : names) {
            if (sb.length() > 0) sb.append(',');
            sb.append(qn);
        }
        return sb;
    }

    public EndpointAddress getEndpointAddress(QName qName) {
    	PortInfo p = ports.get(qName);
        return p != null ? p.targetEndpoint : null;
    }

    public Dispatch createDispatch(QName portName, JAXBContext jaxbContext, Service.Mode mode) throws WebServiceException {
        return createDispatch(portName, jaxbContext, mode, EMPTY_FEATURES);
    }

    @Override
    public Dispatch createDispatch(QName portName, WSEndpointReference wsepr, JAXBContext jaxbContext, Service.Mode mode, WebServiceFeature... features) {
    	return createDispatch(portName, wsepr, jaxbContext, mode, new WebServiceFeatureList(features));
    }
    
    protected Dispatch createDispatch(QName portName, WSEndpointReference wsepr, JAXBContext jaxbContext, Service.Mode mode, WebServiceFeatureList features) {
        PortInfo port = safeGetPort(portName);

        ComponentFeature cf = features.get(ComponentFeature.class);
        if (cf != null && !Target.STUB.equals(cf.getTarget())) {
            throw new IllegalArgumentException();
        }
        ComponentsFeature csf = features.get(ComponentsFeature.class);
        if (csf != null) {
            for (ComponentFeature cfi : csf.getComponentFeatures()) {
                if (!Target.STUB.equals(cfi.getTarget()))
                    throw new IllegalArgumentException();
            }
        }
        features.addAll(this.features);
        
        BindingImpl binding = port.createBinding(features, null, null);
        binding.setMode(mode);
        Dispatch dispatch = Stubs.createJAXBDispatch(
                port, binding, jaxbContext, mode,wsepr);
         serviceInterceptor.postCreateDispatch((WSBindingProvider)dispatch);
         return dispatch;
    }

    @Override
    public @NotNull Container getContainer() {
        return container;
    }

    public Dispatch createDispatch(QName portName, JAXBContext jaxbContext, Service.Mode mode, WebServiceFeature... webServiceFeatures) {
    	return createDispatch(portName, jaxbContext, mode, new WebServiceFeatureList(webServiceFeatures));
    }
    
    protected Dispatch createDispatch(QName portName, JAXBContext jaxbContext, Service.Mode mode, WebServiceFeatureList features) {
        WSEndpointReference wsepr = null;
        boolean isAddressingEnabled = false;
        AddressingFeature af = features.get(AddressingFeature.class);
        if (af == null) {
            af = this.features.get(AddressingFeature.class);
        }
        if (af != null && af.isEnabled())
            isAddressingEnabled = true;
        MemberSubmissionAddressingFeature msa = features.get(MemberSubmissionAddressingFeature.class);
        if (msa == null) {
            msa = this.features.get(MemberSubmissionAddressingFeature.class);
        }
        if (msa != null && msa.isEnabled())
            isAddressingEnabled = true;
        if(isAddressingEnabled && wsdlService != null && wsdlService.get(portName) != null) {
            wsepr = wsdlService.get(portName).getEPR();
        }
        return createDispatch(portName, wsepr, jaxbContext, mode, features);
    }

    public Dispatch createDispatch(EndpointReference endpointReference, JAXBContext context, Service.Mode mode, WebServiceFeature... features) {
        WSEndpointReference wsepr = new WSEndpointReference(endpointReference);
        QName portName = addPortEpr(wsepr);
        return createDispatch(portName, wsepr, context, mode, features);
    }

    private QName addPortEpr(WSEndpointReference wsepr) {
        if (wsepr == null)
            throw new WebServiceException(ProviderApiMessages.NULL_EPR());
        QName eprPortName = getPortNameFromEPR(wsepr, null);
        //add Port, if it does n't exist;
        // TODO: what if it has different epr address?
        {
            PortInfo portInfo = new PortInfo(this, (wsepr.getAddress() == null) ? null : EndpointAddress.create(wsepr.getAddress()), eprPortName,
                    getPortModel(wsdlService, eprPortName).getBinding().getBindingId());
            if (!ports.containsKey(eprPortName)) {
                ports.put(eprPortName, portInfo);
            }
        }
        return eprPortName;
    }
    
    /**
     *
     * @param wsepr EndpointReference from which portName will be extracted.
     *      If EndpointName ( port name) is null in EPR, then it will try to get if from WSDLModel using portType QName
     * @param portTypeName
     *          should be null in dispatch case
     *          should be non null in SEI case
     * @return
     *      port name from EPR after validating various metadat elements.
     *      Also if service instance does n't have wsdl,
     *      then it gets the WSDL metadata from EPR and builds wsdl model.
     */
    private QName getPortNameFromEPR(@NotNull WSEndpointReference wsepr, @Nullable QName portTypeName) {
        QName portName;
        WSEndpointReference.Metadata metadata = wsepr.getMetaData();
        QName eprServiceName = metadata.getServiceName();
        QName eprPortName = metadata.getPortName();
        if ((eprServiceName != null ) && !eprServiceName.equals(serviceName)) {
            throw new WebServiceException("EndpointReference WSDL ServiceName differs from Service Instance WSDL Service QName.\n"
                    + " The two Service QNames must match");
        }
        if (wsdlService == null) {
            Source eprWsdlSource = metadata.getWsdlSource();
            if (eprWsdlSource == null) {
                throw new WebServiceException(ProviderApiMessages.NULL_WSDL());
            }
            try {
                WSDLModel eprWsdlMdl = parseWSDL(new URL(wsepr.getAddress()), eprWsdlSource, null);
                wsdlService = eprWsdlMdl.getService(serviceName);
                if (wsdlService == null)
                    throw new WebServiceException(ClientMessages.INVALID_SERVICE_NAME(serviceName,
                            buildNameList(eprWsdlMdl.getServices().keySet())));
            } catch (MalformedURLException e) {
                throw new WebServiceException(ClientMessages.INVALID_ADDRESS(wsepr.getAddress()));
            }
        }
        portName = eprPortName;

        if (portName == null && portTypeName != null) {
            //get the first port corresponding to the SEI
            WSDLPort port = wsdlService.getMatchingPort(portTypeName);
            if (port == null)
                throw new WebServiceException(ClientMessages.UNDEFINED_PORT_TYPE(portTypeName));
            portName = port.getName();
        }
        if (portName == null)
            throw new WebServiceException(ProviderApiMessages.NULL_PORTNAME());
        if (wsdlService.get(portName) == null)
            throw new WebServiceException(ClientMessages.INVALID_EPR_PORT_NAME(portName, buildWsdlPortNames()));

        return portName;

    }

    private  T createProxy(final Class portInterface, final InvocationHandler pis) {

        // When creating the proxy, use a ClassLoader that can load classes
        // from both the interface class and also from this classes
        // classloader. This is necessary when this code is used in systems
        // such as OSGi where the class loader for the interface class may
        // not be able to load internal JAX-WS classes like
        // "WSBindingProvider", but the class loader for this class may not
        // be able to load the interface class.
        final ClassLoader loader = getDelegatingLoader(portInterface.getClassLoader(),
                WSServiceDelegate.class.getClassLoader());

        return AccessController.doPrivileged(
                new PrivilegedAction() {
                    @Override
                    public T run() {
                        Object proxy = Proxy.newProxyInstance(loader,
                                new Class[]{portInterface, WSBindingProvider.class, Closeable.class}, pis);
                        return portInterface.cast(proxy);
                    }
                });

    }

    private WSDLService getWSDLModelfromSEI(final Class sei) {
        WebService ws = AccessController.doPrivileged(new PrivilegedAction() {
            public WebService run() {
                return (WebService) sei.getAnnotation(WebService.class);
            }
        });
        if (ws == null || ws.wsdlLocation().equals(""))
            return null;
        String wsdlLocation = ws.wsdlLocation();
        wsdlLocation = JAXWSUtils.absolutize(JAXWSUtils.getFileOrURLName(wsdlLocation));
        Source wsdl = new StreamSource(wsdlLocation);
        WSDLService service = null;

        try {
            URL url = wsdl.getSystemId() == null ? null : new URL(wsdl.getSystemId());
            WSDLModel model = parseWSDL(url, wsdl, sei);
            service = model.getService(this.serviceName);
            if (service == null)
                throw new WebServiceException(
                        ClientMessages.INVALID_SERVICE_NAME(this.serviceName,
                                buildNameList(model.getServices().keySet())));
        } catch (MalformedURLException e) {
            throw new WebServiceException(ClientMessages.INVALID_WSDL_URL(wsdl.getSystemId()));
        }
        return service;
    }

    public QName getServiceName() {
        return serviceName;
    }

    public Class getServiceClass() {
        return serviceClass;
    }

    public Iterator getPorts() throws WebServiceException {
        // KK: the spec seems to be ambigous about whether
        // this returns ports that are dynamically added or not.
        return ports.keySet().iterator();
    }

    @Override
    public URL getWSDLDocumentLocation() {
        if(wsdlService==null)   return null;
        try {
            return new URL(wsdlService.getParent().getLocation().getSystemId());
        } catch (MalformedURLException e) {
            throw new AssertionError(e); // impossible
        }
    }

    private  T createEndpointIFBaseProxy(@Nullable WSEndpointReference epr, QName portName, Class portInterface,
                                            WebServiceFeatureList webServiceFeatures, SEIPortInfo eif) {
        //fail if service doesnt have WSDL
        if (wsdlService == null) {
            throw new WebServiceException(ClientMessages.INVALID_SERVICE_NO_WSDL(serviceName));
        }

        if (wsdlService.get(portName)==null) {
            throw new WebServiceException(
                ClientMessages.INVALID_PORT_NAME(portName,buildWsdlPortNames()));
        }

        BindingImpl binding = eif.createBinding(webServiceFeatures, portInterface);
        InvocationHandler pis = getStubHandler(binding, eif, epr);

        T proxy = createProxy(portInterface, pis);

        if (serviceInterceptor != null) {
            serviceInterceptor.postCreateProxy((WSBindingProvider)proxy, portInterface);
        }
        return proxy;
    }
    
    protected InvocationHandler getStubHandler(BindingImpl binding, SEIPortInfo eif, @Nullable WSEndpointReference epr) {
    	return new SEIStub(eif, binding, eif.model, epr);
    }

    /**
     * Lists up the port names in WSDL. For error diagnostics.
     */
    private StringBuilder buildWsdlPortNames() {
        Set wsdlPortNames = new HashSet();
        for (WSDLPort port : wsdlService.getPorts()) {
            wsdlPortNames.add(port.getName());
        }
        return buildNameList(wsdlPortNames);
    }

    /**
     * Obtains a {@link WSDLPortImpl} with error check.
     *
     * @return guaranteed to be non-null.
     */
    public @NotNull WSDLPort getPortModel(WSDLService wsdlService, QName portName) {
        WSDLPort port = wsdlService.get(portName);
        if (port == null)
            throw new WebServiceException(
                ClientMessages.INVALID_PORT_NAME(portName,buildWsdlPortNames()));
        return port;
    }

    /**
     * Contributes to the construction of {@link WSServiceDelegate} by filling in
     * {@link SEIPortInfo} about a given SEI (linked from the {@link Service}-derived class.)
     */
    //todo: valid port in wsdl
    private SEIPortInfo addSEI(QName portName, Class portInterface, WebServiceFeatureList features) throws WebServiceException {
        boolean ownModel = useOwnSEIModel(features);
        if (ownModel) {
            // Create a new model and do not cache it
            return createSEIPortInfo(portName, portInterface, features);
        }

        SEIPortInfo spi = seiContext.get(portName);
        if (spi == null) {
            spi = createSEIPortInfo(portName, portInterface, features);
            seiContext.put(spi.portName, spi);
            ports.put(spi.portName, spi);
        }
        return spi;
    }
    
    public SEIModel buildRuntimeModel(QName serviceName, QName portName, Class portInterface, WSDLPort wsdlPort, WebServiceFeatureList features) {
		DatabindingFactory fac = DatabindingFactory.newInstance();
		DatabindingConfig config = new DatabindingConfig();
		config.setContractClass(portInterface);
		config.getMappingInfo().setServiceName(serviceName);
		config.setWsdlPort(wsdlPort);
		config.setFeatures(features);
		config.setClassLoader(portInterface.getClassLoader());
		config.getMappingInfo().setPortName(portName);
		config.setWsdlURL(wsdlURL);
        // if ExternalMetadataFeature present, ExternalMetadataReader will be created ...
        config.setMetadataReader(getMetadadaReader(features, portInterface.getClassLoader()));
		
		com.sun.xml.ws.db.DatabindingImpl rt = (com.sun.xml.ws.db.DatabindingImpl)fac.createRuntime(config);
		
		return rt.getModel();
    }

    private MetadataReader getMetadadaReader(WebServiceFeatureList features, ClassLoader classLoader) {
        if (features == null) return null;
        com.oracle.webservices.api.databinding.ExternalMetadataFeature ef =
                features.get(com.oracle.webservices.api.databinding.ExternalMetadataFeature.class);
        // TODO-Miran: would it be necessary to disable secure xml processing?
        if (ef != null)
            return ef.getMetadataReader(classLoader, false);
        return null;
    }

    private SEIPortInfo createSEIPortInfo(QName portName, Class portInterface, WebServiceFeatureList features) {
        WSDLPort wsdlPort = getPortModel(wsdlService, portName);
        SEIModel model = buildRuntimeModel(serviceName, portName, portInterface, wsdlPort, features);
		
        return new SEIPortInfo(this, portInterface, (SOAPSEIModel) model, wsdlPort);
    }
    
    private boolean useOwnSEIModel(WebServiceFeatureList features) {
        return features.contains(UsesJAXBContextFeature.class);
    }

    public WSDLService getWsdlService() {
        return wsdlService;
    }

    protected static final WebServiceFeature[] EMPTY_FEATURES = new WebServiceFeature[0];
  
    private static ClassLoader getDelegatingLoader(ClassLoader loader1, ClassLoader loader2) {
    	if (loader1 == null) return loader2;
    	if (loader2 == null) return loader1;

      //If there is already a parent-child relationship between loaders,
      //it does not make sense to create a new one
      //The created proxy might be reusable, otherwise a new proxy is
      //created on each call since a new loader is used each time
      ClassLoader parent = loader1;
      while (parent != null) {
         if (parent == loader2) return loader1;
         parent = parent.getParent();
    	}
    	return new DelegatingLoader(loader1, loader2);
    }
    
    private static final class DelegatingLoader extends ClassLoader {
        private final ClassLoader loader;

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result
                    + ((loader == null) ? 0 : loader.hashCode());
            result = prime * result
                    + ((getParent() == null) ? 0 : getParent().hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            DelegatingLoader other = (DelegatingLoader) obj;
            if (loader == null) {
                if (other.loader != null)
                    return false;
            } else if (!loader.equals(other.loader))
                return false;
            if (getParent() == null) {
                if (other.getParent() != null)
                    return false;
            } else if (!getParent().equals(other.getParent()))
                return false;
            return true;
        }

        DelegatingLoader(ClassLoader loader1, ClassLoader loader2) {
            super(loader2);
            this.loader = loader1;
        }

        protected Class findClass(String name) throws ClassNotFoundException {
            return loader.loadClass(name);
        }

        protected URL findResource(String name) {
            return loader.getResource(name);
        }
    }
}

    

    

    
            
    
            







    
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