7a163ec05c
2002-12-19 Anthony Green <green@redhat.com> * Makefile.am (ordinary_java_source_files): Add org/xml/sax/helpers/NewInstance.java. * Makefile.in: Rebuilt. * org/xml/sax/package.html, org/xml/sax/ext/package.html, org/xml/sax/helpers/package.html: New files. * org/xml/sax/*: Upgrade to SAX 2.0.1 release from http://www.saxproject.org. From-SVN: r60350
120 lines
4.7 KiB
Java
120 lines
4.7 KiB
Java
// SAX entity resolver.
|
|
// http://www.saxproject.org
|
|
// No warranty; no copyright -- use this as you will.
|
|
// $Id: EntityResolver.java,v 1.7.2.3 2002/01/29 21:34:14 dbrownell Exp $
|
|
|
|
package org.xml.sax;
|
|
|
|
import java.io.IOException;
|
|
|
|
|
|
/**
|
|
* Basic interface for resolving entities.
|
|
*
|
|
* <blockquote>
|
|
* <em>This module, both source code and documentation, is in the
|
|
* Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
|
|
* See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
|
|
* for further information.
|
|
* </blockquote>
|
|
*
|
|
* <p>If a SAX application needs to implement customized handling
|
|
* for external entities, it must implement this interface and
|
|
* register an instance with the SAX driver using the
|
|
* {@link org.xml.sax.XMLReader#setEntityResolver setEntityResolver}
|
|
* method.</p>
|
|
*
|
|
* <p>The XML reader will then allow the application to intercept any
|
|
* external entities (including the external DTD subset and external
|
|
* parameter entities, if any) before including them.</p>
|
|
*
|
|
* <p>Many SAX applications will not need to implement this interface,
|
|
* but it will be especially useful for applications that build
|
|
* XML documents from databases or other specialised input sources,
|
|
* or for applications that use URI types other than URLs.</p>
|
|
*
|
|
* <p>The following resolver would provide the application
|
|
* with a special character stream for the entity with the system
|
|
* identifier "http://www.myhost.com/today":</p>
|
|
*
|
|
* <pre>
|
|
* import org.xml.sax.EntityResolver;
|
|
* import org.xml.sax.InputSource;
|
|
*
|
|
* public class MyResolver implements EntityResolver {
|
|
* public InputSource resolveEntity (String publicId, String systemId)
|
|
* {
|
|
* if (systemId.equals("http://www.myhost.com/today")) {
|
|
* // return a special input source
|
|
* MyReader reader = new MyReader();
|
|
* return new InputSource(reader);
|
|
* } else {
|
|
* // use the default behaviour
|
|
* return null;
|
|
* }
|
|
* }
|
|
* }
|
|
* </pre>
|
|
*
|
|
* <p>The application can also use this interface to redirect system
|
|
* identifiers to local URIs or to look up replacements in a catalog
|
|
* (possibly by using the public identifier).</p>
|
|
*
|
|
* @since SAX 1.0
|
|
* @author David Megginson
|
|
* @version 2.0.1 (sax2r2)
|
|
* @see org.xml.sax.XMLReader#setEntityResolver
|
|
* @see org.xml.sax.InputSource
|
|
*/
|
|
public interface EntityResolver {
|
|
|
|
|
|
/**
|
|
* Allow the application to resolve external entities.
|
|
*
|
|
* <p>The parser will call this method before opening any external
|
|
* entity except the top-level document entity. Such entities include
|
|
* the external DTD subset and external parameter entities referenced
|
|
* within the DTD (in either case, only if the parser reads external
|
|
* parameter entities), and external general entities referenced
|
|
* within the document element (if the parser reads external general
|
|
* entities). The application may request that the parser locate
|
|
* the entity itself, that it use an alternative URI, or that it
|
|
* use data provided by the application (as a character or byte
|
|
* input stream).</p>
|
|
*
|
|
* <p>Application writers can use this method to redirect external
|
|
* system identifiers to secure and/or local URIs, 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). Neither XML nor SAX specifies a preferred policy for using
|
|
* public or system IDs to resolve resources. However, SAX specifies
|
|
* how to interpret any InputSource returned by this method, and that
|
|
* if none is returned, then the system ID will be dereferenced as
|
|
* a URL. </p>
|
|
*
|
|
* <p>If the system identifier is a URL, the SAX parser must
|
|
* resolve it fully before reporting it to the application.</p>
|
|
*
|
|
* @param publicId The public identifier of the external entity
|
|
* being referenced, or null if none was supplied.
|
|
* @param systemId The system identifier of the external entity
|
|
* being referenced.
|
|
* @return An InputSource object describing the new input source,
|
|
* or null to request that the parser open a regular
|
|
* URI connection to the system identifier.
|
|
* @exception org.xml.sax.SAXException Any SAX exception, possibly
|
|
* wrapping another exception.
|
|
* @exception java.io.IOException A Java-specific IO exception,
|
|
* possibly the result of creating a new InputStream
|
|
* or Reader for the InputSource.
|
|
* @see org.xml.sax.InputSource
|
|
*/
|
|
public abstract InputSource resolveEntity (String publicId,
|
|
String systemId)
|
|
throws SAXException, IOException;
|
|
|
|
}
|
|
|
|
// end of EntityResolver.java
|