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package javax.xml.ws;

import javax.xml.bind.annotation.XmlTransient;

import javax.xml.transform.Result;

import javax.xml.transform.Source;

import javax.xml.transform.stream.StreamResult;

import javax.xml.ws.spi.Provider;

import javax.xml.ws.wsaddressing.W3CEndpointReference;

import java.io.StringWriter;

/**

 * This class represents an WS-Addressing EndpointReference

 * which is a remote reference to a web service endpoint.

 * See <a href="http://www.w3.org/TR/2006/REC-ws-addr-core-20060509/">

 * Web Services Addressing 1.0 - Core</a>

 * for more information on WS-Addressing EndpointReferences.

 * <p>

 * This class is immutable as the typical web service developer

 * need not be concerned with its contents.  The web service

 * developer should use this class strictly as a mechanism to

 * reference a remote web service endpoint. See the {@link Service} APIs

 * that clients can use to that utilize an <code>EndpointReference</code>.

 * See the {@link javax.xml.ws.Endpoint}, and

 * {@link javax.xml.ws.BindingProvider} APIs on how

 * <code>EndpointReferences</code> can be created for published

 * endpoints.

 * <p>

 * Concrete implementations of this class will represent

 * an <code>EndpointReference</code> for a particular version of Addressing.

 * For example the {@link W3CEndpointReference} is for use

 * with W3C Web Services Addressing 1.0 - Core Recommendation.

 * If JAX-WS implementors need to support different versions

 * of addressing, they should write their own

 * <code>EndpointReference</code> subclass for that version.

 * This will allow a JAX-WS implementation to create

 * a vendor specific <code>EndpointReferences</code> that the

 * vendor can use to flag a different version of

 * addressing.

 * <p>

 * Web service developers that wish to pass or return

 * <code>EndpointReference</code> in Java methods in an

 * SEI should use

 * concrete instances of an <code>EndpointReference</code> such

 * as the <code>W3CEndpointReference</code>.  This way the

 * schema mapped from the SEI will be more descriptive of the

 * type of endpoint reference being passed.

 * <p>

 * JAX-WS implementors are expected to extract the XML infoset

 * from an <CODE>EndpointReferece</CODE> using the

 * <code>{@link EndpointReference#writeTo}</code>

 * method.

 * <p>

 * JAXB will bind this class to xs:anyType. If a better binding

 * is desired, web services developers should use a concrete

 * subclass such as {@link W3CEndpointReference}.

 *

 * @see W3CEndpointReference

 * @see Service

 * @since JAX-WS 2.1

 */

@XmlTransient // to treat this class like Object as far as databinding is concerned (proposed JAXB 2.1 feature)

public abstract class EndpointReference {

    //

    //Default constructor to be only called by derived types.

    //

    protected EndpointReference(){}

    /**

     * Factory method to read an EndpointReference from the infoset contained in

     * <code>eprInfoset</code>. This method delegates to the vendor specific

     * implementation of the {@link javax.xml.ws.spi.Provider#readEndpointReference} method.

     *

     * @param eprInfoset The <code>EndpointReference</code> infoset to be unmarshalled

     *

     * @return the EndpointReference unmarshalled from <code>eprInfoset</code>

     *    never <code>null</code>

     * @throws WebServiceException

     *    if an error occurs while creating the

     *    <code>EndpointReference</code> from the <CODE>eprInfoset</CODE>

     * @throws java.lang.IllegalArgumentException

     *     if the <code>null</code> <code>eprInfoset</code> value is given.

     */

    public static EndpointReference readFrom(Source eprInfoset) {

        return Provider.provider().readEndpointReference(eprInfoset);

    }

    /**

     * write this <code>EndpointReference</code> to the specified infoset format

     *

     * @param result for writing infoset

     * @throws WebServiceException

     *   if there is an error writing the

     *   <code>EndpointReference</code> to the specified <code>result</code>.

     *

     * @throws java.lang.IllegalArgumentException

     *      If the <code>null</code> <code>result</code> value is given.

     */

    public abstract void writeTo(Result result);

    /**

     * The <code>getPort</code> method returns a proxy. If there

     * are any reference parameters in the

     * <code>EndpointReference</code> instance, then those reference

     * parameters MUST appear as SOAP headers, indicating them to be

     * reference parameters, on all messages sent to the endpoint.

     * The parameter  <code>serviceEndpointInterface</code> specifies

     * the service endpoint interface that is supported by the

     * returned proxy.

     * The <code>EndpointReference</code> instance specifies the

     * endpoint that will be invoked by the returned proxy.

     * In the implementation of this method, the JAX-WS

     * runtime system takes the responsibility of selecting a protocol

     * binding (and a port) and configuring the proxy accordingly from

     * the WSDL Metadata from this <code>EndpointReference</code> or from

     * annotations on the <code>serviceEndpointInterface</code>.  For this method

     * to successfully return a proxy, WSDL metadata MUST be available and the

     * <code>EndpointReference</code> instance MUST contain an implementation understood

     * <code>serviceName</code> metadata.

     * <p>

     * Because this port is not created from a <code>Service</code> object, handlers

     * will not automatically be configured, and the <code>HandlerResolver</code>

     * and <code>Executor</code> cannot be get or set for this port. The

     * <code>BindingProvider().getBinding().setHandlerChain()</code>

     * method can be used to manually configure handlers for this port.

     *

     *

     * @param serviceEndpointInterface Service endpoint interface

     * @param features  An array of <code>WebServiceFeatures</code> to configure on the

     *                proxy.  Supported features not in the <code>features

     *                </code> parameter will have their default values.

     * @return Object Proxy instance that supports the

     *                  specified service endpoint interface

     * @throws WebServiceException

     *                  <UL>

     *                  <LI>If there is an error during creation

     *                      of the proxy

     *                  <LI>If there is any missing WSDL metadata

     *                      as required by this method

     *                  <LI>If this

     *                      <code>endpointReference</code>

     *                      is invalid

     *                  <LI>If an illegal

     *                      <code>serviceEndpointInterface</code>

     *                      is specified

     *                  <LI>If a feature is enabled that is not compatible with

     *                      this port or is unsupported.

     *                   </UL>

     *

     * @see java.lang.reflect.Proxy

     * @see WebServiceFeature

     **/

    public <T> T getPort(Class<T> serviceEndpointInterface,

                         WebServiceFeature... features) {

        return Provider.provider().getPort(this, serviceEndpointInterface,

                                           features);

    }

    /**

     * Displays EPR infoset for debugging convenience.

     */

    public String toString() {

        StringWriter w = new StringWriter();

        writeTo(new StreamResult(w));

        return w.toString();

    }

}