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/*

 * Copyright (c) 2004 World Wide Web Consortium,

 *

 * (Massachusetts Institute of Technology, European Research Consortium for

 * Informatics and Mathematics, Keio University). All Rights Reserved. This

 * work is distributed under the W3C(r) Software License [1] in the hope that

 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 *

 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231

 */

package org.w3c.dom.ls;

/**

 *  <code>LSResourceResolver</code> provides a way for applications to

 * redirect references to external resources.

 * <p> Applications needing to implement custom handling for external

 * resources can implement this interface and register their implementation

 * by setting the "resource-resolver" parameter of

 * <code>DOMConfiguration</code> objects attached to <code>LSParser</code>

 * and <code>LSSerializer</code>. It can also be register on

 * <code>DOMConfiguration</code> objects attached to <code>Document</code>

 * if the "LS" feature is supported.

 * <p> The <code>LSParser</code> will then allow the application to intercept

 * any external entities, including the external DTD subset and external

 * parameter entities, before including them. The top-level document entity

 * is never passed to the <code>resolveResource</code> method.

 * <p> Many DOM applications will not need to implement this interface, but it

 * will be especially useful for applications that build XML documents from

 * databases or other specialized input sources, or for applications that

 * use URNs.

 * <p ><b>Note:</b>  <code>LSResourceResolver</code> is based on the SAX2 [<a href='http://www.saxproject.org/'>SAX</a>] <code>EntityResolver</code>

 * interface.

 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-LS-20040407'>Document Object Model (DOM) Level 3 Load

and Save Specification</a>.

 */

public interface LSResourceResolver {

    /**

     *  Allow the application to resolve external resources.

     * <br> The <code>LSParser</code> will call this method before opening any

     * external resource, including the external DTD subset, external

     * entities referenced within the DTD, and external entities referenced

     * within the document element (however, the top-level document entity

     * is not passed to this method). The application may then request that

     * the <code>LSParser</code> resolve the external resource itself, that

     * it use an alternative URI, or that it use an entirely different input

     * source.

     * <br> Application writers can use this method to redirect external

     * system identifiers to secure and/or local URI, to look up public

     * identifiers in a catalogue, or to read an entity from a database or

     * other input source (including, for example, a dialog box).

     * @param type  The type of the resource being resolved. For XML [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>] resources

     *   (i.e. entities), applications must use the value

     *   <code>"http://www.w3.org/TR/REC-xml"</code>. For XML Schema [<a href='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]

     *   , applications must use the value

     *   <code>"http://www.w3.org/2001/XMLSchema"</code>. Other types of

     *   resources are outside the scope of this specification and therefore

     *   should recommend an absolute URI in order to use this method.

     * @param namespaceURI  The namespace of the resource being resolved,

     *   e.g. the target namespace of the XML Schema [<a href='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]

     *    when resolving XML Schema resources.

     * @param publicId  The public identifier of the external entity being

     *   referenced, or <code>null</code> if no public identifier was

     *   supplied or if the resource is not an entity.

     * @param systemId  The system identifier, a URI reference [<a href='http://www.ietf.org/rfc/rfc2396.txt'>IETF RFC 2396</a>], of the

     *   external resource being referenced, or <code>null</code> if no

     *   system identifier was supplied.

     * @param baseURI  The absolute base URI of the resource being parsed, or

     *   <code>null</code> if there is no base URI.

     * @return  A <code>LSInput</code> object describing the new input

     *   source, or <code>null</code> to request that the parser open a

     *   regular URI connection to the resource.

     */

    public LSInput resolveResource(String type,

                                   String namespaceURI,

                                   String publicId,

                                   String systemId,

                                   String baseURI);

}