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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.wsdl.writer;

import com.sun.istack.Nullable;
import com.sun.xml.ws.api.server.SDDocument;

/**
 * Resolves relative references among the metadata(WSDL, schema)
 * documents.
 *
 * 
 * This interface is implemented by the caller of
 * {@link SDDocument#writeTo} method so that the {@link SDDocument} can
 * correctly produce references to other documents.
 *
 * 
Usage Example 1
 * 
 * Say: http://localhost/hello?wsdl has reference to
 * 

 *   <xsd:import namespace="urn:test:types" schemaLocation="http://localhost/hello?xsd=1"/>
 *
 * 

 * Using this class, it is possible to write A.wsdl to a local filesystem with
 * a local file schema import.
 * 
 *   <xsd:import namespace="urn:test:types" schemaLocation="hello.xsd"/>
 *
 * @author Jitendra Kotamraju
 */
public interface DocumentLocationResolver {
    /**
     * Produces a relative reference from one document to another.
     *
     * @param namespaceURI
     *      The namespace urI for the referenced document.
     *      for e.g. wsdl:import/@namespace, xsd:import/@namespace
     * @param systemId
     *      The location value for the referenced document.
     *      for e.g. wsdl:import/@location, xsd:import/@schemaLocation
     * @return
     *      The reference to be put inside {@code current} to refer to
     *      {@code referenced}. This can be a relative URL as well as
     *      an absolute. If null is returned, then the document
     *      will produce a "implicit reference" (for example, <xs:import>
     *      without the @schemaLocation attribute, etc).
     */
    @Nullable String getLocationFor(String namespaceURI, String systemId);
}